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Diffstat (limited to '')
| -rw-r--r-- | src/cleanup/cleanup_milter.c | 2775 |
1 files changed, 2775 insertions, 0 deletions
diff --git a/src/cleanup/cleanup_milter.c b/src/cleanup/cleanup_milter.c new file mode 100644 index 0000000..b71a6dd --- /dev/null +++ b/src/cleanup/cleanup_milter.c @@ -0,0 +1,2775 @@ +/*++ +/* NAME +/* cleanup_milter 3 +/* SUMMARY +/* external mail filter support +/* SYNOPSIS +/* #include <cleanup.h> +/* +/* void cleanup_milter_header_checks_init(void) +/* +/* void cleanup_milter_receive(state, count) +/* CLEANUP_STATE *state; +/* int count; +/* +/* void cleanup_milter_inspect(state, milters) +/* CLEANUP_STATE *state; +/* MILTERS *milters; +/* +/* cleanup_milter_emul_mail(state, milters, sender) +/* CLEANUP_STATE *state; +/* MILTERS *milters; +/* const char *sender; +/* +/* cleanup_milter_emul_rcpt(state, milters, recipient) +/* CLEANUP_STATE *state; +/* MILTERS *milters; +/* const char *recipient; +/* +/* cleanup_milter_emul_data(state, milters) +/* CLEANUP_STATE *state; +/* MILTERS *milters; +/* DESCRIPTION +/* This module implements support for Sendmail-style mail +/* filter (milter) applications, including in-place queue file +/* modification. +/* +/* cleanup_milter_header_checks_init() does pre-jail +/* initializations. +/* +/* cleanup_milter_receive() receives mail filter definitions, +/* typically from an smtpd(8) server process, and registers +/* local call-back functions for macro expansion and for queue +/* file modification. +/* +/* cleanup_milter_inspect() sends the current message headers +/* and body to the mail filters that were received with +/* cleanup_milter_receive(), or that are specified with the +/* cleanup_milters configuration parameter. +/* +/* cleanup_milter_emul_mail() emulates connect, helo and mail +/* events for mail that does not arrive via the smtpd(8) server. +/* The emulation pretends that mail arrives from localhost/127.0.0.1 +/* via ESMTP. Milters can reject emulated connect, helo, mail +/* or data events, but not emulated rcpt events as described +/* next. +/* +/* cleanup_milter_emul_rcpt() emulates an rcpt event for mail +/* that does not arrive via the smtpd(8) server. This reports +/* a server configuration error condition when the milter +/* rejects an emulated rcpt event. +/* +/* cleanup_milter_emul_data() emulates a data event for mail +/* that does not arrive via the smtpd(8) server. It's OK for +/* milters to reject emulated data events. +/* SEE ALSO +/* milter(3) generic mail filter interface +/* DIAGNOSTICS +/* Fatal errors: memory allocation problem. +/* Panic: interface violation. +/* Warnings: I/O errors (state->errs is updated accordingly). +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/* +/* Wietse Venema +/* Google, Inc. +/* 111 8th Avenue +/* New York, NY 10011, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <sys/socket.h> /* AF_INET */ +#include <string.h> +#include <errno.h> + +#ifdef STRCASECMP_IN_STRINGS_H +#include <strings.h> +#endif + +/* Utility library. */ + +#include <msg.h> +#include <vstream.h> +#include <vstring.h> +#include <stringops.h> +#include <inet_proto.h> + +/* Global library. */ + +#include <off_cvt.h> +#include <dsn_mask.h> +#include <rec_type.h> +#include <cleanup_user.h> +#include <record.h> +#include <rec_attr_map.h> +#include <mail_proto.h> +#include <mail_params.h> +#include <lex_822.h> +#include <is_header.h> +#include <quote_821_local.h> +#include <dsn_util.h> +#include <xtext.h> +#include <info_log_addr_form.h> + +/* Application-specific. */ + +#include <cleanup.h> + + /* + * How Postfix 2.4 edits queue file information: + * + * Mail filter applications (Milters) can send modification requests after + * receiving the end of the message body. Postfix implements these + * modifications in the cleanup server, so that it can edit the queue file + * in place. This avoids the temporary files that would be needed when + * modifications were implemented in the SMTP server (Postfix normally does + * not store the whole message in main memory). Once a Milter is done + * editing, the queue file can be used as input for the next Milter, and so + * on. Finally, the cleanup server changes file permissions, calls fsync(), + * and waits for successful completion. + * + * To implement in-place queue file edits, we need to introduce surprisingly + * little change to the existing Postfix queue file structure. All we need + * is a way to mark a record as deleted, and to jump from one place in the + * queue file to another. We could implement deleted records with jumps, but + * marking is sometimes simpler. + * + * Postfix does not store queue files as plain text files. Instead all + * information is stored in records with an explicit type and length, for + * sender, recipient, arrival time, and so on. Even the content that makes + * up the message header and body is stored as records with explicit types + * and lengths. This organization makes it very easy to mark a record as + * deleted, and to introduce the pointer records that we will use to jump + * from one place in a queue file to another place. + * + * - Deleting a recipient is easiest - simply modify the record type into one + * that is skipped by the software that delivers mail. We won't try to reuse + * the deleted recipient for other purposes. When deleting a recipient, we + * may need to delete multiple recipient records that result from virtual + * alias expansion of the original recipient address. + * + * - Replacing a header record involves pointer records. A record is replaced + * by overwriting it with a forward pointer to space after the end of the + * queue file, putting the new record there, followed by a reverse pointer + * to the record that follows the replaced header. To simplify + * implementation we follow a short header record with a filler record so + * that we can always overwrite a header record with a pointer. + * + * N.B. This is a major difference with Postfix version 2.3, which needed + * complex code to save records that follow a short header, before it could + * overwrite a short header record. This code contained two of the three + * post-release bugs that were found with Postfix header editing. + * + * - Inserting a header record is like replacing one, except that we also + * relocate the record that is being overwritten by the forward pointer. + * + * - Deleting a message header is simplest when we replace it by a "skip" + * pointer to the information that follows the header. With a multi-line + * header we need to update only the first line. + * + * - Appending a recipient or header record involves pointer records as well. + * To make this convenient, the queue file already contains dummy pointer + * records at the locations where we want to append recipient or header + * content. To append, change the dummy pointer into a forward pointer to + * space after the end of a message, put the new recipient or header record + * there, followed by a reverse pointer to the record that follows the + * forward pointer. + * + * - To append another header or recipient record, replace the reverse pointer + * by a forward pointer to space after the end of a message, put the new + * record there, followed by the value of the reverse pointer that we + * replace. Thus, there is no one-to-one correspondence between forward and + * backward pointers. Instead, there can be multiple forward pointers for + * one reverse pointer. + * + * - When a mail filter wants to replace an entire body, we overwrite existing + * body records until we run out of space, and then write a pointer to space + * after the end of the queue file, followed by more body content. There may + * be multiple regions with body content; regions are connected by forward + * pointers, and the last region ends with a pointer to the marker that ends + * the message content segment. Body regions can be large and therefore they + * are reused to avoid wasting space. Sendmail mail filters currently do not + * replace individual body records, and that is a good thing. + * + * Making queue file modifications safe: + * + * Postfix queue files are segmented. The first segment is for envelope + * records, the second for message header and body content, and the third + * segment is for information that was extracted or generated from the + * message header or body content. Each segment is terminated by a marker + * record. For now we don't want to change their location. That is, we want + * to avoid moving the records that mark the start or end of a queue file + * segment. + * + * To ensure that we can always replace a header or body record by a pointer + * record, without having to relocate a marker record, the cleanup server + * places a dummy pointer record at the end of the recipients and at the end + * of the message header. To support message body modifications, a dummy + * pointer record is also placed at the end of the message content. + * + * With all these changes in queue file organization, REC_TYPE_END is no longer + * guaranteed to be the last record in a queue file. If an application were + * to read beyond the REC_TYPE_END marker, it would go into an infinite + * loop, because records after REC_TYPE_END alternate with reverse pointers + * to the middle of the queue file. For robustness, the record reading + * routine skips forward to the end-of-file position after reading the + * REC_TYPE_END marker. + */ + +/*#define msg_verbose 2*/ + +static HBC_CHECKS *cleanup_milter_hbc_checks; +static VSTRING *cleanup_milter_hbc_reply; +static void cleanup_milter_set_error(CLEANUP_STATE *, int); +static const char *cleanup_add_rcpt_par(void *, const char *, const char *); + +#define STR(x) vstring_str(x) +#define LEN(x) VSTRING_LEN(x) + +/* cleanup_milter_hbc_log - log post-milter header/body_checks action */ + +static void cleanup_milter_hbc_log(void *context, const char *action, + const char *where, const char *line, + const char *optional_text) +{ + const CLEANUP_STATE *state = (CLEANUP_STATE *) context; + const char *attr; + + vstring_sprintf(state->temp1, "%s: milter-%s-%s: %s %.200s from %s[%s];", + state->queue_id, where, action, where, line, + state->client_name, state->client_addr); + if (state->sender) + vstring_sprintf_append(state->temp1, " from=<%s>", + info_log_addr_form_sender(state->sender)); + if (state->recip) + vstring_sprintf_append(state->temp1, " to=<%s>", + info_log_addr_form_recipient(state->recip)); + if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_PROTO_NAME)) != 0) + vstring_sprintf_append(state->temp1, " proto=%s", attr); + if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_HELO_NAME)) != 0) + vstring_sprintf_append(state->temp1, " helo=<%s>", attr); + if (optional_text) + vstring_sprintf_append(state->temp1, ": %s", optional_text); + msg_info("%s", vstring_str(state->temp1)); +} + +/* cleanup_milter_header_prepend - prepend header to milter-generated header */ + +static void cleanup_milter_header_prepend(void *context, int rec_type, + const char *buf, ssize_t len, off_t offset) +{ + /* XXX save prepended header to buffer. */ + msg_warn("the milter_header/body_checks prepend action is not implemented"); +} + +/* cleanup_milter_hbc_extend - additional header/body_checks actions */ + +static char *cleanup_milter_hbc_extend(void *context, const char *command, + ssize_t cmd_len, const char *optional_text, + const char *where, const char *buf, + ssize_t buf_len, off_t offset) +{ + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + const char *map_class = VAR_MILT_HEAD_CHECKS; /* XXX */ + +#define STREQUAL(x,y,l) (strncasecmp((x), (y), (l)) == 0 && (y)[l] == 0) + + /* + * These are currently our mutually-exclusive ways of not receiving mail: + * "reject" and "discard". Only these can be reported to the up-stream + * Postfix libmilter code, because sending any reply there causes Postfix + * libmilter to skip further "edit" requests. By way of safety net, each + * of these must also reset CLEANUP_FLAG_FILTER_ALL. + */ +#define CLEANUP_MILTER_REJECTING_OR_DISCARDING_MESSAGE(state) \ + ((state->flags & CLEANUP_FLAG_DISCARD) || (state->errs & CLEANUP_STAT_CONT)) + + /* + * We log all header/body-checks actions here, because we know the + * details of the message content that triggered the action. We report + * detail-free milter-reply values (reject/discard, stored in the + * milter_hbc_reply state member) to the Postfix libmilter code, so that + * Postfix libmilter can stop sending requests. + * + * We also set all applicable cleanup flags here, because there is no + * guarantee that Postfix libmilter will propagate our own milter-reply + * value to cleanup_milter_inspect() which calls cleanup_milter_apply(). + * The latter translates responses from Milter applications into cleanup + * flags, and logs the response text. Postfix libmilter can convey only + * one milter-reply value per email message, and that reply may even come + * from outside Postfix. + * + * To suppress redundant logging, cleanup_milter_apply() does nothing when + * the milter-reply value matches the saved text in the milter_hbc_reply + * state member. As we remember only one milter-reply value, we can't + * report multiple milter-reply values per email message. We satisfy this + * constraint, because we already clear the CLEANUP_FLAG_FILTER_ALL flags + * to terminate further header inspection. + */ + if ((state->flags & CLEANUP_FLAG_FILTER_ALL) == 0) + return ((char *) buf); + + if (STREQUAL(command, "BCC", cmd_len)) { + if (strchr(optional_text, '@') == 0) { + msg_warn("bad BCC address \"%s\" in %s map -- " + "need user@domain", + optional_text, VAR_MILT_HEAD_CHECKS); + } else { + cleanup_milter_hbc_log(context, "bcc", where, buf, optional_text); + /* Caller checks state error flags. */ + (void) cleanup_add_rcpt_par(state, optional_text, ""); + } + return ((char *) buf); + } + if (STREQUAL(command, "REJECT", cmd_len)) { + const CLEANUP_STAT_DETAIL *detail; + + if (state->reason) + myfree(state->reason); + detail = cleanup_stat_detail(CLEANUP_STAT_CONT); + if (*optional_text) { + state->reason = dsn_prepend(detail->dsn, optional_text); + if (*state->reason != '4' && *state->reason != '5') { + msg_warn("bad DSN action in %s -- need 4.x.x or 5.x.x", + optional_text); + *state->reason = '4'; + } + } else { + state->reason = dsn_prepend(detail->dsn, detail->text); + } + if (*state->reason == '4') + state->errs |= CLEANUP_STAT_DEFER; + else + state->errs |= CLEANUP_STAT_CONT; + state->flags &= ~CLEANUP_FLAG_FILTER_ALL; + cleanup_milter_hbc_log(context, "reject", where, buf, state->reason); + vstring_sprintf(cleanup_milter_hbc_reply, "%d %s", + detail->smtp, state->reason); + STR(cleanup_milter_hbc_reply)[0] = *state->reason; + return ((char *) buf); + } + if (STREQUAL(command, "FILTER", cmd_len)) { + if (*optional_text == 0) { + msg_warn("missing FILTER command argument in %s map", map_class); + } else if (strchr(optional_text, ':') == 0) { + msg_warn("bad FILTER command %s in %s -- " + "need transport:destination", + optional_text, map_class); + } else { + if (state->filter) + myfree(state->filter); + state->filter = mystrdup(optional_text); + cleanup_milter_hbc_log(context, "filter", where, buf, + optional_text); + } + return ((char *) buf); + } + if (STREQUAL(command, "DISCARD", cmd_len)) { + cleanup_milter_hbc_log(context, "discard", where, buf, optional_text); + vstring_strcpy(cleanup_milter_hbc_reply, "D"); + state->flags |= CLEANUP_FLAG_DISCARD; + state->flags &= ~CLEANUP_FLAG_FILTER_ALL; + return ((char *) buf); + } + if (STREQUAL(command, "HOLD", cmd_len)) { + if ((state->flags & (CLEANUP_FLAG_HOLD | CLEANUP_FLAG_DISCARD)) == 0) { + cleanup_milter_hbc_log(context, "hold", where, buf, optional_text); + state->flags |= CLEANUP_FLAG_HOLD; + } + return ((char *) buf); + } + if (STREQUAL(command, "REDIRECT", cmd_len)) { + if (strchr(optional_text, '@') == 0) { + msg_warn("bad REDIRECT target \"%s\" in %s map -- " + "need user@domain", + optional_text, map_class); + } else { + if (state->redirect) + myfree(state->redirect); + state->redirect = mystrdup(optional_text); + cleanup_milter_hbc_log(context, "redirect", where, buf, + optional_text); + state->flags &= ~CLEANUP_FLAG_FILTER_ALL; + } + return ((char *) buf); + } + return ((char *) HBC_CHECKS_STAT_UNKNOWN); +} + +/* cleanup_milter_header_checks - inspect Milter-generated header */ + +static int cleanup_milter_header_checks(CLEANUP_STATE *state, VSTRING *buf) +{ + char *ret; + + /* + * Milter application "add/insert/replace header" requests happen at the + * end-of-message stage, therefore all the header operations are relative + * to the primary message header. + */ + ret = hbc_header_checks((void *) state, cleanup_milter_hbc_checks, + MIME_HDR_PRIMARY, (HEADER_OPTS *) 0, + buf, (off_t) 0); + if (ret == 0) { + return (0); + } else if (ret == HBC_CHECKS_STAT_ERROR) { + msg_warn("%s: %s map lookup problem -- " + "message not accepted, try again later", + state->queue_id, VAR_MILT_HEAD_CHECKS); + state->errs |= CLEANUP_STAT_WRITE; + return (0); + } else { + if (ret != STR(buf)) { + vstring_strcpy(buf, ret); + myfree(ret); + } + return (1); + } +} + +/* cleanup_milter_hbc_add_meta_records - add REDIRECT or FILTER meta records */ + +static void cleanup_milter_hbc_add_meta_records(CLEANUP_STATE *state) +{ + const char *myname = "cleanup_milter_hbc_add_meta_records"; + off_t reverse_ptr_offset; + off_t new_meta_offset; + + /* + * Note: this code runs while the Milter infrastructure is being torn + * down. For this reason we handle all I/O errors here on the spot, + * instead of reporting them back through the Milter infrastructure. + */ + + /* + * Sanity check. + */ + if (state->append_meta_pt_offset < 0) + msg_panic("%s: no meta append pointer location", myname); + if (state->append_meta_pt_target < 0) + msg_panic("%s: no meta append pointer target", myname); + + /* + * Allocate space after the end of the queue file, and write the meta + * record(s), followed by a reverse pointer record that points to the + * target of the old "meta record append" pointer record. This reverse + * pointer record becomes the new "meta record append" pointer record. + * Although the new "meta record append" pointer record will never be + * used, we update it here to make the code more similar to other code + * that inserts/appends content, so that common code can be factored out + * later. + */ + if ((new_meta_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) { + cleanup_milter_set_error(state, errno); + return; + } + if (state->filter != 0) + cleanup_out_string(state, REC_TYPE_FILT, state->filter); + if (state->redirect != 0) + cleanup_out_string(state, REC_TYPE_RDR, state->redirect); + if ((reverse_ptr_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path); + state->errs |= CLEANUP_STAT_WRITE; + return; + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) state->append_meta_pt_target); + + /* + * Pointer flipping: update the old "meta record append" pointer record + * value with the location of the new meta record. + */ + if (vstream_fseek(state->dst, state->append_meta_pt_offset, SEEK_SET) < 0) { + cleanup_milter_set_error(state, errno); + return; + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) new_meta_offset); + + /* + * Update the in-memory "meta append" pointer record location with the + * location of the reverse pointer record that follows the new meta + * record. The target of the "meta append" pointer record does not + * change; it's always the record that follows the dummy pointer record + * that was written while Postfix received the message. + */ + state->append_meta_pt_offset = reverse_ptr_offset; + + /* + * Note: state->append_meta_pt_target never changes. + */ +} + +/* cleanup_milter_header_checks_init - initialize post-Milter header checks */ + +void cleanup_milter_header_checks_init(void) +{ + static const char myname[] = "cleanup_milter_header_checks_init"; + +#define NO_NESTED_HDR_NAME "" +#define NO_NESTED_HDR_VALUE "" +#define NO_MIME_HDR_NAME "" +#define NO_MIME_HDR_VALUE "" + + static /* XXX not const */ HBC_CALL_BACKS call_backs = { + cleanup_milter_hbc_log, + cleanup_milter_header_prepend, + cleanup_milter_hbc_extend, + }; + + if (*var_milt_head_checks == 0) + msg_panic("%s: %s is empty", myname, VAR_MILT_HEAD_CHECKS); + + if (cleanup_milter_hbc_checks) + msg_panic("%s: cleanup_milter_hbc_checks is not null", myname); + cleanup_milter_hbc_checks = + hbc_header_checks_create(VAR_MILT_HEAD_CHECKS, var_milt_head_checks, + NO_MIME_HDR_NAME, NO_MIME_HDR_VALUE, + NO_NESTED_HDR_NAME, NO_NESTED_HDR_VALUE, + &call_backs); + + if (cleanup_milter_hbc_reply) + msg_panic("%s: cleanup_milter_hbc_reply is not null", myname); + cleanup_milter_hbc_reply = vstring_alloc(100); +} + +#ifdef TEST + +/* cleanup_milter_header_checks_deinit - undo cleanup_milter_header_checks_init */ + +static void cleanup_milter_header_checks_deinit(void) +{ + static const char myname[] = "cleanup_milter_header_checks_deinit"; + + if (cleanup_milter_hbc_checks == 0) + msg_panic("%s: cleanup_milter_hbc_checks is null", myname); + hbc_header_checks_free(cleanup_milter_hbc_checks); + cleanup_milter_hbc_checks = 0; + + if (cleanup_milter_hbc_reply == 0) + msg_panic("%s: cleanup_milter_hbc_reply is null", myname); + vstring_free(cleanup_milter_hbc_reply); + cleanup_milter_hbc_reply = 0; +} + +#endif + +/* cleanup_milter_header_checks_reinit - re-init post-Milter header checks */ + +static void cleanup_milter_header_checks_reinit(CLEANUP_STATE *state) +{ + if (state->filter) + myfree(state->filter); + state->filter = 0; + if (state->redirect) + myfree(state->redirect); + state->redirect = 0; + VSTRING_RESET(cleanup_milter_hbc_reply); +} + +/* cleanup_milter_hbc_finish - finalize post-Milter header checks */ + +static void cleanup_milter_hbc_finish(CLEANUP_STATE *state) +{ + if (CLEANUP_OUT_OK(state) + && !CLEANUP_MILTER_REJECTING_OR_DISCARDING_MESSAGE(state) + && (state->filter || state->redirect)) + cleanup_milter_hbc_add_meta_records(state); +} + + /* + * Milter replies. + */ +#define CLEANUP_MILTER_SET_REASON(__state, __reason) do { \ + if ((__state)->reason) \ + myfree((__state)->reason); \ + (__state)->reason = mystrdup(__reason); \ + if ((__state)->smtp_reply) { \ + myfree((__state)->smtp_reply); \ + (__state)->smtp_reply = 0; \ + } \ + } while (0) + +#define CLEANUP_MILTER_SET_SMTP_REPLY(__state, __smtp_reply) do { \ + if ((__state)->reason) \ + myfree((__state)->reason); \ + (__state)->reason = mystrdup(__smtp_reply + 4); \ + printable((__state)->reason, '_'); \ + if ((__state)->smtp_reply) \ + myfree((__state)->smtp_reply); \ + (__state)->smtp_reply = mystrdup(__smtp_reply); \ + } while (0) + +/* cleanup_milter_set_error - set error flag from errno */ + +static void cleanup_milter_set_error(CLEANUP_STATE *state, int err) +{ + if (err == EFBIG) { + msg_warn("%s: queue file size limit exceeded", state->queue_id); + state->errs |= CLEANUP_STAT_SIZE; + } else { + msg_warn("%s: write queue file: %m", state->queue_id); + state->errs |= CLEANUP_STAT_WRITE; + } +} + +/* cleanup_milter_error - return dummy error description */ + +static const char *cleanup_milter_error(CLEANUP_STATE *state, int err) +{ + const char *myname = "cleanup_milter_error"; + const CLEANUP_STAT_DETAIL *dp; + + /* + * For consistency with error reporting within the milter infrastructure, + * content manipulation routines return a null pointer on success, and an + * SMTP-like response on error. + * + * However, when cleanup_milter_apply() receives this error response from + * the milter infrastructure, it ignores the text since the appropriate + * cleanup error flags were already set by cleanup_milter_set_error(). + * + * Specify a null error number when the "errno to error flag" mapping was + * already done elsewhere, possibly outside this module. + */ + if (err) + cleanup_milter_set_error(state, err); + else if (CLEANUP_OUT_OK(state)) + msg_panic("%s: missing errno to error flag mapping", myname); + if (state->milter_err_text == 0) + state->milter_err_text = vstring_alloc(50); + dp = cleanup_stat_detail(state->errs); + return (STR(vstring_sprintf(state->milter_err_text, + "%d %s %s", dp->smtp, dp->dsn, dp->text))); +} + +/* cleanup_add_header - append message header */ + +static const char *cleanup_add_header(void *context, const char *name, + const char *space, + const char *value) +{ + const char *myname = "cleanup_add_header"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + VSTRING *buf; + off_t reverse_ptr_offset; + off_t new_hdr_offset; + + /* + * To simplify implementation, the cleanup server writes a dummy "header + * append" pointer record after the last message header. We cache both + * the location and the target of the current "header append" pointer + * record. + */ + if (state->append_hdr_pt_offset < 0) + msg_panic("%s: no header append pointer location", myname); + if (state->append_hdr_pt_target < 0) + msg_panic("%s: no header append pointer target", myname); + + /* + * Return early when Milter header checks request that this header record + * be dropped, or that the message is discarded. Note: CLEANUP_OUT_OK() + * tests CLEANUP_FLAG_DISCARD. We don't want to report the latter as an + * error. + */ + buf = vstring_alloc(100); + vstring_sprintf(buf, "%s:%s%s", name, space, value); + if (cleanup_milter_hbc_checks) { + if (cleanup_milter_header_checks(state, buf) == 0 + || (state->flags & CLEANUP_FLAG_DISCARD)) { + vstring_free(buf); + return (0); + } + if (CLEANUP_OUT_OK(state) == 0) { + vstring_free(buf); + return (cleanup_milter_error(state, 0)); + } + } + + /* + * Allocate space after the end of the queue file, and write the header + * record(s), followed by a reverse pointer record that points to the + * target of the old "header append" pointer record. This reverse pointer + * record becomes the new "header append" pointer record. + */ + if ((new_hdr_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + vstring_free(buf); + return (cleanup_milter_error(state, errno)); + } + /* XXX emit prepended header, then clear it. */ + cleanup_out_header(state, buf); /* Includes padding */ + vstring_free(buf); + if ((reverse_ptr_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) state->append_hdr_pt_target); + + /* + * Pointer flipping: update the old "header append" pointer record value + * with the location of the new header record. + * + * XXX To avoid unnecessary seek operations when the new header immediately + * follows the old append header pointer, write a null pointer or make + * the record reading loop smarter. Making vstream_fseek() smarter does + * not help, because it doesn't know if we're going to read or write + * after a write+seek sequence. + */ + if (vstream_fseek(state->dst, state->append_hdr_pt_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) new_hdr_offset); + + /* + * Update the in-memory "header append" pointer record location with the + * location of the reverse pointer record that follows the new header. + * The target of the "header append" pointer record does not change; it's + * always the record that follows the dummy pointer record that was + * written while Postfix received the message. + */ + state->append_hdr_pt_offset = reverse_ptr_offset; + + /* + * In case of error while doing record output. + */ + return (CLEANUP_OUT_OK(state) == 0 ? cleanup_milter_error(state, 0) : + cleanup_milter_hbc_reply && LEN(cleanup_milter_hbc_reply) ? + STR(cleanup_milter_hbc_reply) : 0); + + /* + * Note: state->append_hdr_pt_target never changes. + */ +} + +/* cleanup_find_header_start - find specific header instance */ + +static off_t cleanup_find_header_start(CLEANUP_STATE *state, ssize_t index, + const char *header_label, + VSTRING *buf, + int *prec_type, + int allow_ptr_backup, + int skip_headers) +{ + const char *myname = "cleanup_find_header_start"; + off_t curr_offset; /* offset after found record */ + off_t ptr_offset; /* pointer to found record */ + VSTRING *ptr_buf = 0; + int rec_type = REC_TYPE_ERROR; + int last_type; + ssize_t len; + int hdr_count = 0; + + if (msg_verbose) + msg_info("%s: index %ld name \"%s\"", + myname, (long) index, header_label ? header_label : "(none)"); + + /* + * Sanity checks. + */ + if (index < 1) + msg_panic("%s: bad header index %ld", myname, (long) index); + + /* + * Skip to the start of the message content, and read records until we + * either find the specified header, or until we hit the end of the + * headers. + * + * The index specifies the header instance: 1 is the first one. The header + * label specifies the header name. A null pointer matches any header. + * + * When the specified header is not found, the result value is -1. + * + * When the specified header is found, its first record is stored in the + * caller-provided read buffer, and the result value is the queue file + * offset of that record. The file read position is left at the start of + * the next (non-filler) queue file record, which can be the remainder of + * a multi-record header. + * + * When a header is found and allow_ptr_backup is non-zero, then the result + * is either the first record of that header, or it is the pointer record + * that points to the first record of that header. In the latter case, + * the file read position is undefined. Returning the pointer allows us + * to do some optimizations when inserting text multiple times at the + * same place. + * + * XXX We can't use the MIME processor here. It not only buffers up the + * input, it also reads the record that follows a complete header before + * it invokes the header call-back action. This complicates the way that + * we discover header offsets and boundaries. Worse is that the MIME + * processor is unaware that multi-record message headers can have PTR + * records in the middle. + * + * XXX The draw-back of not using the MIME processor is that we have to + * duplicate some of its logic here and in the routine that finds the end + * of the header record. To minimize the duplication we define an ugly + * macro that is used in all code that scans for header boundaries. + * + * XXX Sendmail compatibility (based on Sendmail 8.13.6 measurements). + * + * - When changing Received: header #1, we change the Received: header that + * follows our own one; a request to change Received: header #0 is + * silently treated as a request to change Received: header #1. + * + * - When changing Date: header #1, we change the first Date: header; a + * request to change Date: header #0 is silently treated as a request to + * change Date: header #1. + * + * Thus, header change requests are relative to the content as received, + * that is, the content after our own Received: header. They can affect + * only the headers that the MTA actually exposes to mail filter + * applications. + * + * - However, when inserting a header at position 0, the new header appears + * before our own Received: header, and when inserting at position 1, the + * new header appears after our own Received: header. + * + * Thus, header insert operations are relative to the content as delivered, + * that is, the content including our own Received: header. + * + * None of the above is applicable after a Milter inserts a header before + * our own Received: header. From then on, our own Received: header + * becomes just like other headers. + */ +#define CLEANUP_FIND_HEADER_NOTFOUND (-1) +#define CLEANUP_FIND_HEADER_IOERROR (-2) + +#define CLEANUP_FIND_HEADER_RETURN(offs) do { \ + if (ptr_buf) \ + vstring_free(ptr_buf); \ + return (offs); \ + } while (0) + +#define GET_NEXT_TEXT_OR_PTR_RECORD(rec_type, state, buf, curr_offset, quit) \ + if ((rec_type = rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE)) < 0) { \ + msg_warn("%s: read file %s: %m", myname, cleanup_path); \ + cleanup_milter_set_error(state, errno); \ + do { quit; } while (0); \ + } \ + if (msg_verbose > 1) \ + msg_info("%s: read: %ld: %.*s", myname, (long) curr_offset, \ + LEN(buf) > 30 ? 30 : (int) LEN(buf), STR(buf)); \ + if (rec_type == REC_TYPE_DTXT) \ + continue; \ + if (rec_type != REC_TYPE_NORM && rec_type != REC_TYPE_CONT \ + && rec_type != REC_TYPE_PTR) \ + break; + /* End of hairy macros. */ + + if (vstream_fseek(state->dst, state->data_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + cleanup_milter_set_error(state, errno); + CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR); + } + for (ptr_offset = 0, last_type = 0; /* void */ ; /* void */ ) { + if ((curr_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path); + cleanup_milter_set_error(state, errno); + CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR); + } + /* Don't follow the "append header" pointer. */ + if (curr_offset == state->append_hdr_pt_offset) + break; + /* Caution: this macro terminates the loop at end-of-message. */ + /* Don't do complex processing while breaking out of this loop. */ + GET_NEXT_TEXT_OR_PTR_RECORD(rec_type, state, buf, curr_offset, + CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR)); + /* Caution: don't assume ptr->header. This may be header-ptr->body. */ + if (rec_type == REC_TYPE_PTR) { + if (rec_goto(state->dst, STR(buf)) < 0) { + msg_warn("%s: read file %s: %m", myname, cleanup_path); + cleanup_milter_set_error(state, errno); + CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR); + } + /* Save PTR record, in case it points to the start of a header. */ + if (allow_ptr_backup) { + ptr_offset = curr_offset; + if (ptr_buf == 0) + ptr_buf = vstring_alloc(100); + vstring_strcpy(ptr_buf, STR(buf)); + } + /* Don't update last_type; PTR can happen after REC_TYPE_CONT. */ + continue; + } + /* The middle of a multi-record header. */ + else if (last_type == REC_TYPE_CONT || IS_SPACE_TAB(STR(buf)[0])) { + /* Reset the saved PTR record and update last_type. */ + } + /* No more message headers. */ + else if ((len = is_header(STR(buf))) == 0) { + break; + } + /* This the start of a message header. */ + else if (hdr_count++ < skip_headers) + /* Reset the saved PTR record and update last_type. */ ; + else if ((header_label == 0 + || (strncasecmp(header_label, STR(buf), len) == 0 + && (strlen(header_label) == len))) + && --index == 0) { + /* If we have a saved PTR record, it points to start of header. */ + break; + } + ptr_offset = 0; + last_type = rec_type; + } + + /* + * In case of failure, return negative start position. + */ + if (index > 0) { + curr_offset = CLEANUP_FIND_HEADER_NOTFOUND; + } else { + + /* + * Skip over short-header padding, so that the file read pointer is + * always positioned at the first non-padding record after the header + * record. Insist on padding after short a header record, so that a + * short header record can safely be overwritten by a pointer record. + */ + if (LEN(buf) < REC_TYPE_PTR_PAYL_SIZE) { + VSTRING *rbuf = (ptr_offset ? buf : + (ptr_buf ? ptr_buf : + (ptr_buf = vstring_alloc(100)))); + int rval; + + if ((rval = rec_get_raw(state->dst, rbuf, 0, REC_FLAG_NONE)) < 0) { + cleanup_milter_set_error(state, errno); + CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR); + } + if (rval != REC_TYPE_DTXT) + msg_panic("%s: short header without padding", myname); + } + + /* + * Optionally return a pointer to the message header, instead of the + * start of the message header itself. In that case the file read + * position is undefined (actually it is at the first non-padding + * record that follows the message header record). + */ + if (ptr_offset != 0) { + rec_type = REC_TYPE_PTR; + curr_offset = ptr_offset; + vstring_strcpy(buf, STR(ptr_buf)); + } + *prec_type = rec_type; + } + if (msg_verbose) + msg_info("%s: index %ld name %s type %d offset %ld", + myname, (long) index, header_label ? + header_label : "(none)", rec_type, (long) curr_offset); + + CLEANUP_FIND_HEADER_RETURN(curr_offset); +} + +/* cleanup_find_header_end - find end of header */ + +static off_t cleanup_find_header_end(CLEANUP_STATE *state, + VSTRING *rec_buf, + int last_type) +{ + const char *myname = "cleanup_find_header_end"; + off_t read_offset; + int rec_type; + + /* + * This routine is called immediately after cleanup_find_header_start(). + * rec_buf is the cleanup_find_header_start() result record; last_type is + * the corresponding record type: REC_TYPE_PTR or REC_TYPE_NORM; the file + * read position is at the first non-padding record after the result + * header record. + */ + for (;;) { + if ((read_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: read file %s: %m", myname, cleanup_path); + cleanup_milter_error(state, errno); + return (-1); + } + /* Don't follow the "append header" pointer. */ + if (read_offset == state->append_hdr_pt_offset) + break; + /* Caution: this macro terminates the loop at end-of-message. */ + /* Don't do complex processing while breaking out of this loop. */ + GET_NEXT_TEXT_OR_PTR_RECORD(rec_type, state, rec_buf, read_offset, + /* Warning and errno->error mapping are done elsewhere. */ + return (-1)); + if (rec_type == REC_TYPE_PTR) { + if (rec_goto(state->dst, STR(rec_buf)) < 0) { + msg_warn("%s: read file %s: %m", myname, cleanup_path); + cleanup_milter_error(state, errno); + return (-1); + } + /* Don't update last_type; PTR may follow REC_TYPE_CONT. */ + continue; + } + /* Start of header or message body. */ + if (last_type != REC_TYPE_CONT && !IS_SPACE_TAB(STR(rec_buf)[0])) + break; + last_type = rec_type; + } + return (read_offset); +} + +/* cleanup_patch_header - patch new header into an existing header */ + +static const char *cleanup_patch_header(CLEANUP_STATE *state, + const char *new_hdr_name, + const char *hdr_space, + const char *new_hdr_value, + off_t old_rec_offset, + int old_rec_type, + VSTRING *old_rec_buf, + off_t next_offset) +{ + const char *myname = "cleanup_patch_header"; + VSTRING *buf = vstring_alloc(100); + off_t new_hdr_offset; + +#define CLEANUP_PATCH_HEADER_RETURN(ret) do { \ + vstring_free(buf); \ + return (ret); \ + } while (0) + + if (msg_verbose) + msg_info("%s: \"%s\" \"%s\" at %ld", + myname, new_hdr_name, new_hdr_value, (long) old_rec_offset); + + /* + * Allocate space after the end of the queue file for the new header and + * optionally save an existing record to make room for a forward pointer + * record. If the saved record was not a PTR record, follow the saved + * record by a reverse pointer record that points to the record after the + * original location of the saved record. + * + * We update the queue file in a safe manner: save the new header and the + * existing records after the end of the queue file, write the reverse + * pointer, and only then overwrite the saved records with the forward + * pointer to the new header. + * + * old_rec_offset, old_rec_type, and old_rec_buf specify the record that we + * are about to overwrite with a pointer record. If the record needs to + * be saved (i.e. old_rec_type > 0), the buffer contains the data content + * of exactly one PTR or text record. + * + * next_offset specifies the record that follows the to-be-overwritten + * record. It is ignored when the to-be-saved record is a pointer record. + */ + + /* + * Return early when Milter header checks request that this header record + * be dropped. + */ + vstring_sprintf(buf, "%s:%s%s", new_hdr_name, hdr_space, new_hdr_value); + if (cleanup_milter_hbc_checks + && cleanup_milter_header_checks(state, buf) == 0) + CLEANUP_PATCH_HEADER_RETURN(0); + + /* + * Write the new header to a new location after the end of the queue + * file. + */ + if ((new_hdr_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + CLEANUP_PATCH_HEADER_RETURN(cleanup_milter_error(state, errno)); + } + /* XXX emit prepended header, then clear it. */ + cleanup_out_header(state, buf); /* Includes padding */ + if (msg_verbose > 1) + msg_info("%s: %ld: write %.*s", myname, (long) new_hdr_offset, + LEN(buf) > 30 ? 30 : (int) LEN(buf), STR(buf)); + + /* + * Optionally, save the existing text record or pointer record that will + * be overwritten with the forward pointer. Pad a short saved record to + * ensure that it, too, can be overwritten by a pointer. + */ + if (old_rec_type > 0) { + CLEANUP_OUT_BUF(state, old_rec_type, old_rec_buf); + if (LEN(old_rec_buf) < REC_TYPE_PTR_PAYL_SIZE) + rec_pad(state->dst, REC_TYPE_DTXT, + REC_TYPE_PTR_PAYL_SIZE - LEN(old_rec_buf)); + if (msg_verbose > 1) + msg_info("%s: write %.*s", myname, LEN(old_rec_buf) > 30 ? + 30 : (int) LEN(old_rec_buf), STR(old_rec_buf)); + } + + /* + * If the saved record wasn't a PTR record, write the reverse pointer + * after the saved records. A reverse pointer value of -1 means we were + * confused about what we were going to save. + */ + if (old_rec_type != REC_TYPE_PTR) { + if (next_offset < 0) + msg_panic("%s: bad reverse pointer %ld", + myname, (long) next_offset); + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) next_offset); + if (msg_verbose > 1) + msg_info("%s: write PTR %ld", myname, (long) next_offset); + } + + /* + * Write the forward pointer over the old record. Generally, a pointer + * record will be shorter than a header record, so there will be a gap in + * the queue file before the next record. In other words, we must always + * follow pointer records otherwise we get out of sync with the data. + */ + if (vstream_fseek(state->dst, old_rec_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + CLEANUP_PATCH_HEADER_RETURN(cleanup_milter_error(state, errno)); + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) new_hdr_offset); + if (msg_verbose > 1) + msg_info("%s: %ld: write PTR %ld", myname, (long) old_rec_offset, + (long) new_hdr_offset); + + /* + * In case of error while doing record output. + */ + CLEANUP_PATCH_HEADER_RETURN( + CLEANUP_OUT_OK(state) == 0 ? cleanup_milter_error(state, 0) : + cleanup_milter_hbc_reply && LEN(cleanup_milter_hbc_reply) ? + STR(cleanup_milter_hbc_reply) : 0); + + /* + * Note: state->append_hdr_pt_target never changes. + */ +} + +/* cleanup_ins_header - insert message header */ + +static const char *cleanup_ins_header(void *context, ssize_t index, + const char *new_hdr_name, + const char *hdr_space, + const char *new_hdr_value) +{ + const char *myname = "cleanup_ins_header"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + VSTRING *old_rec_buf = vstring_alloc(100); + off_t old_rec_offset; + int old_rec_type; + off_t next_offset; + const char *ret; + +#define CLEANUP_INS_HEADER_RETURN(ret) do { \ + vstring_free(old_rec_buf); \ + return (ret); \ + } while (0) + + if (msg_verbose) + msg_info("%s: %ld \"%s\" \"%s\"", + myname, (long) index, new_hdr_name, new_hdr_value); + + /* + * Look for a header at the specified position. + * + * The lookup result may be a pointer record. This allows us to make some + * optimization when multiple insert operations happen in the same place. + * + * Index 1 is the top-most header. + */ +#define NO_HEADER_NAME ((char *) 0) +#define ALLOW_PTR_BACKUP 1 +#define SKIP_ONE_HEADER 1 +#define DONT_SKIP_HEADERS 0 + + if (index < 1) + index = 1; + old_rec_offset = cleanup_find_header_start(state, index, NO_HEADER_NAME, + old_rec_buf, &old_rec_type, + ALLOW_PTR_BACKUP, + DONT_SKIP_HEADERS); + if (old_rec_offset == CLEANUP_FIND_HEADER_IOERROR) + /* Warning and errno->error mapping are done elsewhere. */ + CLEANUP_INS_HEADER_RETURN(cleanup_milter_error(state, 0)); + + /* + * If the header does not exist, simply append the header to the linked + * list at the "header append" pointer record. + */ + if (old_rec_offset < 0) + CLEANUP_INS_HEADER_RETURN(cleanup_add_header(context, new_hdr_name, + hdr_space, new_hdr_value)); + + /* + * If the header does exist, save both the new and the existing header to + * new storage at the end of the queue file, and link the new storage + * with a forward and reverse pointer (don't write a reverse pointer if + * we are starting with a pointer record). + */ + if (old_rec_type == REC_TYPE_PTR) { + next_offset = -1; + } else { + if ((next_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: read file %s: %m", myname, cleanup_path); + CLEANUP_INS_HEADER_RETURN(cleanup_milter_error(state, errno)); + } + } + ret = cleanup_patch_header(state, new_hdr_name, hdr_space, new_hdr_value, + old_rec_offset, old_rec_type, + old_rec_buf, next_offset); + CLEANUP_INS_HEADER_RETURN(ret); +} + +/* cleanup_upd_header - modify or append message header */ + +static const char *cleanup_upd_header(void *context, ssize_t index, + const char *new_hdr_name, + const char *hdr_space, + const char *new_hdr_value) +{ + const char *myname = "cleanup_upd_header"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + VSTRING *rec_buf; + off_t old_rec_offset; + off_t next_offset; + int last_type; + const char *ret; + + if (msg_verbose) + msg_info("%s: %ld \"%s\" \"%s\"", + myname, (long) index, new_hdr_name, new_hdr_value); + + /* + * Sanity check. + */ + if (*new_hdr_name == 0) + msg_panic("%s: null header name", myname); + + /* + * Find the header that is being modified. + * + * The lookup result will never be a pointer record. + * + * Index 1 is the first matching header instance. + * + * XXX When a header is updated repeatedly we create jumps to jumps. To + * eliminate this, rewrite the loop below so that we can start with the + * pointer record that points to the header that's being edited. + */ +#define DONT_SAVE_RECORD 0 +#define NO_PTR_BACKUP 0 + +#define CLEANUP_UPD_HEADER_RETURN(ret) do { \ + vstring_free(rec_buf); \ + return (ret); \ + } while (0) + + rec_buf = vstring_alloc(100); + old_rec_offset = cleanup_find_header_start(state, index, new_hdr_name, + rec_buf, &last_type, + NO_PTR_BACKUP, + SKIP_ONE_HEADER); + if (old_rec_offset == CLEANUP_FIND_HEADER_IOERROR) + /* Warning and errno->error mapping are done elsewhere. */ + CLEANUP_UPD_HEADER_RETURN(cleanup_milter_error(state, 0)); + + /* + * If no old header is found, simply append the new header to the linked + * list at the "header append" pointer record. + */ + if (old_rec_offset < 0) + CLEANUP_UPD_HEADER_RETURN(cleanup_add_header(context, new_hdr_name, + hdr_space, new_hdr_value)); + + /* + * If the old header is found, find the end of the old header, save the + * new header to new storage at the end of the queue file, and link the + * new storage with a forward and reverse pointer. + */ + if ((next_offset = cleanup_find_header_end(state, rec_buf, last_type)) < 0) + /* Warning and errno->error mapping are done elsewhere. */ + CLEANUP_UPD_HEADER_RETURN(cleanup_milter_error(state, 0)); + ret = cleanup_patch_header(state, new_hdr_name, hdr_space, new_hdr_value, + old_rec_offset, DONT_SAVE_RECORD, + (VSTRING *) 0, next_offset); + CLEANUP_UPD_HEADER_RETURN(ret); +} + +/* cleanup_del_header - delete message header */ + +static const char *cleanup_del_header(void *context, ssize_t index, + const char *hdr_name) +{ + const char *myname = "cleanup_del_header"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + VSTRING *rec_buf; + off_t header_offset; + off_t next_offset; + int last_type; + + if (msg_verbose) + msg_info("%s: %ld \"%s\"", myname, (long) index, hdr_name); + + /* + * Sanity check. + */ + if (*hdr_name == 0) + msg_panic("%s: null header name", myname); + + /* + * Find the header that is being deleted. + * + * The lookup result will never be a pointer record. + * + * Index 1 is the first matching header instance. + */ +#define CLEANUP_DEL_HEADER_RETURN(ret) do { \ + vstring_free(rec_buf); \ + return (ret); \ + } while (0) + + rec_buf = vstring_alloc(100); + header_offset = cleanup_find_header_start(state, index, hdr_name, rec_buf, + &last_type, NO_PTR_BACKUP, + SKIP_ONE_HEADER); + if (header_offset == CLEANUP_FIND_HEADER_IOERROR) + /* Warning and errno->error mapping are done elsewhere. */ + CLEANUP_DEL_HEADER_RETURN(cleanup_milter_error(state, 0)); + + /* + * Overwrite the beginning of the header record with a pointer to the + * information that follows the header. We can't simply overwrite the + * header with cleanup_out_header() and a special record type, because + * there may be a PTR record in the middle of a multi-line header. + */ + if (header_offset > 0) { + if ((next_offset = cleanup_find_header_end(state, rec_buf, last_type)) < 0) + /* Warning and errno->error mapping are done elsewhere. */ + CLEANUP_DEL_HEADER_RETURN(cleanup_milter_error(state, 0)); + /* Mark the header as deleted. */ + if (vstream_fseek(state->dst, header_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + CLEANUP_DEL_HEADER_RETURN(cleanup_milter_error(state, errno)); + } + rec_fprintf(state->dst, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) next_offset); + } + vstring_free(rec_buf); + + /* + * In case of error while doing record output. + */ + return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0)); +} + +/* cleanup_chg_from - replace sender address, ignore ESMTP arguments */ + +static const char *cleanup_chg_from(void *context, const char *ext_from, + const char *esmtp_args) +{ + const char *myname = "cleanup_chg_from"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + off_t new_offset; + off_t new_sender_offset; + off_t after_sender_offs; + int addr_count; + TOK822 *tree; + TOK822 *tp; + VSTRING *int_sender_buf; + int dsn_envid = 0; + int dsn_ret = 0; + + if (msg_verbose) + msg_info("%s: \"%s\" \"%s\"", myname, ext_from, esmtp_args); + + /* + * ESMTP support is limited to RET and ENVID, i.e. things that are stored + * together with the sender queue file record. + */ + if (esmtp_args[0]) { + ARGV *esmtp_argv; + int i; + const char *arg; + + esmtp_argv = argv_split(esmtp_args, " "); + for (i = 0; i < esmtp_argv->argc; ++i) { + arg = esmtp_argv->argv[i]; + if (strncasecmp(arg, "RET=", 4) == 0) { + if ((dsn_ret = dsn_ret_code(arg + 4)) == 0) { + msg_warn("Ignoring bad ESMTP parameter \"%s\" in " + "SMFI_CHGFROM request", arg); + } else { + state->dsn_ret = dsn_ret; + } + } else if (strncasecmp(arg, "ENVID=", 6) == 0) { + if (state->milter_dsn_buf == 0) + state->milter_dsn_buf = vstring_alloc(20); + dsn_envid = (xtext_unquote(state->milter_dsn_buf, arg + 6) + && allprint(STR(state->milter_dsn_buf))); + if (!dsn_envid) { + msg_warn("Ignoring bad ESMTP parameter \"%s\" in " + "SMFI_CHGFROM request", arg); + } else { + if (state->dsn_envid) + myfree(state->dsn_envid); + state->dsn_envid = mystrdup(STR(state->milter_dsn_buf)); + } + } else { + msg_warn("Ignoring bad ESMTP parameter \"%s\" in " + "SMFI_CHGFROM request", arg); + } + } + argv_free(esmtp_argv); + } + + /* + * The cleanup server remembers the file offset of the current sender + * address record (offset in sender_pt_offset) and the file offset of the + * record that follows the sender address (offset in sender_pt_target). + * Short original sender records are padded, so that they can safely be + * overwritten with a pointer record to the new sender address record. + */ + if (state->sender_pt_offset < 0) + msg_panic("%s: no original sender record offset", myname); + if (state->sender_pt_target < 0) + msg_panic("%s: no post-sender record offset", myname); + + /* + * Allocate space after the end of the queue file, and write the new {DSN + * envid, DSN ret, sender address, sender BCC} records, followed by a + * reverse pointer record that points to the record that follows the + * original sender record. + * + * We update the queue file in a safe manner: save the new sender after the + * end of the queue file, write the reverse pointer, and only then + * overwrite the old sender record with the forward pointer to the new + * sender. + */ + if ((new_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + + /* + * Sender DSN attribute records precede the sender record. + */ + if (dsn_envid) + rec_fprintf(state->dst, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_DSN_ENVID, STR(state->milter_dsn_buf)); + if (dsn_ret) + rec_fprintf(state->dst, REC_TYPE_ATTR, "%s=%d", + MAIL_ATTR_DSN_RET, dsn_ret); + if (dsn_envid == 0 && dsn_ret == 0) { + new_sender_offset = new_offset; + } else if ((new_sender_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + + /* + * Transform the address from external form to internal form. This also + * removes the enclosing <>, if present. + * + * XXX vstring_alloc() rejects zero-length requests. + */ + int_sender_buf = vstring_alloc(strlen(ext_from) + 1); + tree = tok822_parse(ext_from); + for (addr_count = 0, tp = tree; tp != 0; tp = tp->next) { + if (tp->type == TOK822_ADDR) { + if (addr_count == 0) { + tok822_internalize(int_sender_buf, tp->head, TOK822_STR_DEFL); + addr_count += 1; + } else { + msg_warn("%s: Milter request to add multi-sender: \"%s\"", + state->queue_id, ext_from); + break; + } + } + } + tok822_free_tree(tree); + after_sender_offs = cleanup_addr_sender(state, STR(int_sender_buf)); + vstring_free(int_sender_buf); + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) state->sender_pt_target); + state->sender_pt_target = after_sender_offs; + + /* + * Overwrite the current sender record with the pointer to the new {DSN + * envid, DSN ret, sender address, sender BCC} records. + */ + if (vstream_fseek(state->dst, state->sender_pt_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) new_offset); + + /* + * Remember the location of the new current sender record. + */ + state->sender_pt_offset = new_sender_offset; + + /* + * In case of error while doing record output. + */ + return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0)); +} + +/* cleanup_add_rcpt_par - append recipient address, with ESMTP arguments */ + +static const char *cleanup_add_rcpt_par(void *context, const char *ext_rcpt, + const char *esmtp_args) +{ + const char *myname = "cleanup_add_rcpt_par"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + off_t new_rcpt_offset; + off_t reverse_ptr_offset; + int addr_count; + TOK822 *tree; + TOK822 *tp; + VSTRING *int_rcpt_buf; + VSTRING *orcpt_buf = 0; + ARGV *esmtp_argv; + int dsn_notify = 0; + const char *dsn_orcpt_info = 0; + size_t type_len; + int i; + const char *arg; + const char *arg_val; + + if (msg_verbose) + msg_info("%s: \"%s\" \"%s\"", myname, ext_rcpt, esmtp_args); + + /* + * To simplify implementation, the cleanup server writes a dummy + * "recipient append" pointer record after the last recipient. We cache + * both the location and the target of the current "recipient append" + * pointer record. + */ + if (state->append_rcpt_pt_offset < 0) + msg_panic("%s: no recipient append pointer location", myname); + if (state->append_rcpt_pt_target < 0) + msg_panic("%s: no recipient append pointer target", myname); + + /* + * Allocate space after the end of the queue file, and write the + * recipient record, followed by a reverse pointer record that points to + * the target of the old "recipient append" pointer record. This reverse + * pointer record becomes the new "recipient append" pointer record. + * + * We update the queue file in a safe manner: save the new recipient after + * the end of the queue file, write the reverse pointer, and only then + * overwrite the old "recipient append" pointer with the forward pointer + * to the new recipient. + */ + if ((new_rcpt_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + + /* + * Parse ESMTP parameters. XXX UTF8SMTP don't assume ORCPT is xtext. + */ + if (esmtp_args[0]) { + esmtp_argv = argv_split(esmtp_args, " "); + for (i = 0; i < esmtp_argv->argc; ++i) { + arg = esmtp_argv->argv[i]; + if (strncasecmp(arg, "NOTIFY=", 7) == 0) { /* RFC 3461 */ + if (dsn_notify || (dsn_notify = dsn_notify_mask(arg + 7)) == 0) + msg_warn("%s: Bad NOTIFY parameter from Milter or " + "header/body_checks: \"%.100s\"", + state->queue_id, arg); + } else if (strncasecmp(arg, "ORCPT=", 6) == 0) { /* RFC 3461 */ + if (orcpt_buf == 0) + orcpt_buf = vstring_alloc(100); + if (dsn_orcpt_info + || (type_len = strcspn(arg_val = arg + 6, ";")) == 0 + || (arg_val)[type_len] != ';' + || xtext_unquote_append(vstring_sprintf(orcpt_buf, + "%.*s;", (int) type_len, + arg_val), + arg_val + type_len + 1) == 0) { + msg_warn("%s: Bad ORCPT parameter from Milter or " + "header/body_checks: \"%.100s\"", + state->queue_id, arg); + } else { + dsn_orcpt_info = STR(orcpt_buf); + } + } else { + msg_warn("%s: ignoring ESMTP argument from Milter or " + "header/body_checks: \"%.100s\"", + state->queue_id, arg); + } + } + argv_free(esmtp_argv); + } + + /* + * Transform recipient from external form to internal form. This also + * removes the enclosing <>, if present. + * + * XXX vstring_alloc() rejects zero-length requests. + */ + int_rcpt_buf = vstring_alloc(strlen(ext_rcpt) + 1); + tree = tok822_parse(ext_rcpt); + for (addr_count = 0, tp = tree; tp != 0; tp = tp->next) { + if (tp->type == TOK822_ADDR) { + if (addr_count == 0) { + tok822_internalize(int_rcpt_buf, tp->head, TOK822_STR_DEFL); + addr_count += 1; + } else { + msg_warn("%s: Milter or header/body_checks request to " + "add multi-recipient: \"%s\"", + state->queue_id, ext_rcpt); + break; + } + } + } + tok822_free_tree(tree); + if (addr_count != 0) + cleanup_addr_bcc_dsn(state, STR(int_rcpt_buf), dsn_orcpt_info, + dsn_notify ? dsn_notify : DEF_DSN_NOTIFY); + else + msg_warn("%s: ignoring attempt from Milter to add null recipient", + state->queue_id); + vstring_free(int_rcpt_buf); + if (orcpt_buf) + vstring_free(orcpt_buf); + + /* + * Don't update the queue file when we did not write a recipient record + * (malformed or duplicate BCC recipient). + */ + if (vstream_ftell(state->dst) == new_rcpt_offset) + return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0)); + + /* + * Follow the recipient with a "reverse" pointer to the old recipient + * append target. + */ + if ((reverse_ptr_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) state->append_rcpt_pt_target); + + /* + * Pointer flipping: update the old "recipient append" pointer record + * value to the location of the new recipient record. + */ + if (vstream_fseek(state->dst, state->append_rcpt_pt_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } + cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, + (long) new_rcpt_offset); + + /* + * Update the in-memory "recipient append" pointer record location with + * the location of the reverse pointer record that follows the new + * recipient. The target of the "recipient append" pointer record does + * not change; it's always the record that follows the dummy pointer + * record that was written while Postfix received the message. + */ + state->append_rcpt_pt_offset = reverse_ptr_offset; + + /* + * In case of error while doing record output. + */ + return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0)); +} + +/* cleanup_add_rcpt - append recipient address */ + +static const char *cleanup_add_rcpt(void *context, const char *ext_rcpt) +{ + return (cleanup_add_rcpt_par(context, ext_rcpt, "")); +} + +/* cleanup_del_rcpt - remove recipient and all its expansions */ + +static const char *cleanup_del_rcpt(void *context, const char *ext_rcpt) +{ + const char *myname = "cleanup_del_rcpt"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + off_t curr_offset; + VSTRING *buf; + char *attr_name; + char *attr_value; + char *dsn_orcpt = 0; /* XXX for dup filter cleanup */ + int dsn_notify = 0; /* XXX for dup filter cleanup */ + char *orig_rcpt = 0; + char *start; + int rec_type; + int junk; + int count = 0; + TOK822 *tree; + TOK822 *tp; + VSTRING *int_rcpt_buf; + int addr_count; + + if (msg_verbose) + msg_info("%s: \"%s\"", myname, ext_rcpt); + + /* + * Virtual aliasing and other address rewriting happens after the mail + * filter sees the envelope address. Therefore we must delete all + * recipient records whose Postfix (not DSN) original recipient address + * matches the specified address. + * + * As the number of recipients may be very large we can't do an efficient + * two-pass implementation (collect record offsets first, then mark + * records as deleted). Instead we mark records as soon as we find them. + * This is less efficient because we do (seek-write-read) for each marked + * recipient, instead of (seek-write). It's unlikely that VSTREAMs will + * be made smart enough to eliminate unnecessary I/O with small seeks. + * + * XXX When Postfix original recipients are turned off, we have no option + * but to match against the expanded and rewritten recipient address. + * + * XXX Remove the (dsn_orcpt, dsn_notify, orcpt, recip) tuple from the + * duplicate recipient filter. This requires that we maintain reference + * counts. + */ + if (vstream_fseek(state->dst, 0L, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + return (cleanup_milter_error(state, errno)); + } +#define CLEANUP_DEL_RCPT_RETURN(ret) do { \ + if (orig_rcpt != 0) \ + myfree(orig_rcpt); \ + if (dsn_orcpt != 0) \ + myfree(dsn_orcpt); \ + vstring_free(buf); \ + vstring_free(int_rcpt_buf); \ + return (ret); \ + } while (0) + + /* + * Transform recipient from external form to internal form. This also + * removes the enclosing <>, if present. + * + * XXX vstring_alloc() rejects zero-length requests. + */ + int_rcpt_buf = vstring_alloc(strlen(ext_rcpt) + 1); + tree = tok822_parse(ext_rcpt); + for (addr_count = 0, tp = tree; tp != 0; tp = tp->next) { + if (tp->type == TOK822_ADDR) { + if (addr_count == 0) { + tok822_internalize(int_rcpt_buf, tp->head, TOK822_STR_DEFL); + addr_count += 1; + } else { + msg_warn("%s: Milter request to drop multi-recipient: \"%s\"", + state->queue_id, ext_rcpt); + break; + } + } + } + tok822_free_tree(tree); + + buf = vstring_alloc(100); + for (;;) { + if (CLEANUP_OUT_OK(state) == 0) + /* Warning and errno->error mapping are done elsewhere. */ + CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, 0)); + if ((curr_offset = vstream_ftell(state->dst)) < 0) { + msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path); + CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno)); + } + if ((rec_type = rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE)) <= 0) { + msg_warn("%s: read file %s: %m", myname, cleanup_path); + CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno)); + } + if (rec_type == REC_TYPE_END) + break; + /* Skip over message content. */ + if (rec_type == REC_TYPE_MESG) { + if (vstream_fseek(state->dst, state->xtra_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno)); + } + continue; + } + start = STR(buf); + if (rec_type == REC_TYPE_PTR) { + if (rec_goto(state->dst, start) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno)); + } + continue; + } + /* Map attribute names to pseudo record type. */ + if (rec_type == REC_TYPE_ATTR) { + if (split_nameval(STR(buf), &attr_name, &attr_value) != 0 + || *attr_value == 0) + continue; + if ((junk = rec_attr_map(attr_name)) != 0) { + start = attr_value; + rec_type = junk; + } + } + switch (rec_type) { + case REC_TYPE_DSN_ORCPT: /* RCPT TO ORCPT parameter */ + if (dsn_orcpt != 0) /* can't happen */ + myfree(dsn_orcpt); + dsn_orcpt = mystrdup(start); + break; + case REC_TYPE_DSN_NOTIFY: /* RCPT TO NOTIFY parameter */ + if (alldig(start) && (junk = atoi(start)) > 0 + && DSN_NOTIFY_OK(junk)) + dsn_notify = junk; + else + dsn_notify = 0; + break; + case REC_TYPE_ORCP: /* unmodified RCPT TO address */ + if (orig_rcpt != 0) /* can't happen */ + myfree(orig_rcpt); + orig_rcpt = mystrdup(start); + break; + case REC_TYPE_RCPT: /* rewritten RCPT TO address */ + if (strcmp(orig_rcpt ? orig_rcpt : start, STR(int_rcpt_buf)) == 0) { + if (vstream_fseek(state->dst, curr_offset, SEEK_SET) < 0) { + msg_warn("%s: seek file %s: %m", myname, cleanup_path); + CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno)); + } + if (REC_PUT_BUF(state->dst, REC_TYPE_DRCP, buf) < 0) { + msg_warn("%s: write queue file: %m", state->queue_id); + CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno)); + } + count++; + } + if (var_enable_orcpt) + /* Matches been_here() call in cleanup_out_recipient(). */ + been_here_drop(state->dups, "%s\n%d\n%s\n%s", + dsn_orcpt ? dsn_orcpt : "", dsn_notify, + orig_rcpt ? orig_rcpt : "", STR(int_rcpt_buf)); + /* FALLTHROUGH */ + case REC_TYPE_DRCP: /* canceled recipient */ + case REC_TYPE_DONE: /* can't happen */ + if (orig_rcpt != 0) { + myfree(orig_rcpt); + orig_rcpt = 0; + } + if (dsn_orcpt != 0) { + myfree(dsn_orcpt); + dsn_orcpt = 0; + } + dsn_notify = 0; + break; + } + } + /* Matches been_here_fixed() call in cleanup_out_recipient(). */ + if (var_enable_orcpt == 0 && count > 0) + been_here_drop_fixed(state->dups, STR(int_rcpt_buf)); + + if (msg_verbose) + msg_info("%s: deleted %d records for recipient \"%s\"", + myname, count, ext_rcpt); + + CLEANUP_DEL_RCPT_RETURN(0); +} + +/* cleanup_repl_body - replace message body */ + +static const char *cleanup_repl_body(void *context, int cmd, int rec_type, + VSTRING *buf) +{ + const char *myname = "cleanup_repl_body"; + CLEANUP_STATE *state = (CLEANUP_STATE *) context; + static VSTRING empty; + + /* + * XXX Sendmail compatibility: milters don't see the first body line, so + * don't expect they will send one. + */ + switch (cmd) { + case MILTER_BODY_LINE: + if (cleanup_body_edit_write(state, rec_type, buf) < 0) + return (cleanup_milter_error(state, errno)); + break; + case MILTER_BODY_START: + VSTRING_RESET(&empty); + if (cleanup_body_edit_start(state) < 0 + || cleanup_body_edit_write(state, REC_TYPE_NORM, &empty) < 0) + return (cleanup_milter_error(state, errno)); + break; + case MILTER_BODY_END: + if (cleanup_body_edit_finish(state) < 0) + return (cleanup_milter_error(state, errno)); + break; + default: + msg_panic("%s: bad command: %d", myname, cmd); + } + return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, errno)); +} + +/* cleanup_milter_eval - expand macro */ + +static const char *cleanup_milter_eval(const char *name, void *ptr) +{ + CLEANUP_STATE *state = (CLEANUP_STATE *) ptr; + + /* + * Note: if we use XFORWARD attributes here, then consistency requires + * that we forward all Sendmail macros via XFORWARD. + */ + + /* + * System macros. + */ + if (strcmp(name, S8_MAC_DAEMON_NAME) == 0) + return (var_milt_daemon_name); + if (strcmp(name, S8_MAC_V) == 0) + return (var_milt_v); + + /* + * Connect macros. + */ +#ifndef CLIENT_ATTR_UNKNOWN +#define CLIENT_ATTR_UNKNOWN "unknown" +#define SERVER_ATTR_UNKNOWN "unknown" +#endif + + if (strcmp(name, S8_MAC__) == 0) { + vstring_sprintf(state->temp1, "%s [%s]", + state->reverse_name, state->client_addr); + if (strcasecmp(state->client_name, state->reverse_name) != 0) + vstring_strcat(state->temp1, " (may be forged)"); + return (STR(state->temp1)); + } + if (strcmp(name, S8_MAC_J) == 0) + return (var_myhostname); + if (strcmp(name, S8_MAC_CLIENT_ADDR) == 0) + return (state->client_addr); + if (strcmp(name, S8_MAC_CLIENT_NAME) == 0) + return (state->client_name); + if (strcmp(name, S8_MAC_CLIENT_PORT) == 0) + return (state->client_port + && strcmp(state->client_port, CLIENT_ATTR_UNKNOWN) ? + state->client_port : "0"); + if (strcmp(name, S8_MAC_CLIENT_PTR) == 0) + return (state->reverse_name); + /* XXX S8_MAC_CLIENT_RES needs SMTPD_PEER_CODE_XXX from smtpd. */ + if (strcmp(name, S8_MAC_DAEMON_ADDR) == 0) + return (state->server_addr); + if (strcmp(name, S8_MAC_DAEMON_PORT) == 0) + return (state->server_port + && strcmp(state->server_port, SERVER_ATTR_UNKNOWN) ? + state->server_port : "0"); + + /* + * MAIL FROM macros. + */ + if (strcmp(name, S8_MAC_I) == 0) + return (state->queue_id); +#ifdef USE_SASL_AUTH + if (strcmp(name, S8_MAC_AUTH_TYPE) == 0) + return (nvtable_find(state->attr, MAIL_ATTR_SASL_METHOD)); + if (strcmp(name, S8_MAC_AUTH_AUTHEN) == 0) + return (nvtable_find(state->attr, MAIL_ATTR_SASL_USERNAME)); + if (strcmp(name, S8_MAC_AUTH_AUTHOR) == 0) + return (nvtable_find(state->attr, MAIL_ATTR_SASL_SENDER)); +#endif + if (strcmp(name, S8_MAC_MAIL_ADDR) == 0) + return (state->milter_ext_from ? STR(state->milter_ext_from) : 0); + + /* + * RCPT TO macros. + */ + if (strcmp(name, S8_MAC_RCPT_ADDR) == 0) + return (state->milter_ext_rcpt ? STR(state->milter_ext_rcpt) : 0); + return (0); +} + +/* cleanup_milter_receive - receive milter instances */ + +void cleanup_milter_receive(CLEANUP_STATE *state, int count) +{ + if (state->milters) + milter_free(state->milters); + state->milters = milter_receive(state->src, count); + if (state->milters == 0) + msg_fatal("cleanup_milter_receive: milter receive failed"); + if (count <= 0) + return; + milter_macro_callback(state->milters, cleanup_milter_eval, (void *) state); + milter_edit_callback(state->milters, + cleanup_add_header, cleanup_upd_header, + cleanup_ins_header, cleanup_del_header, + cleanup_chg_from, cleanup_add_rcpt, + cleanup_add_rcpt_par, cleanup_del_rcpt, + cleanup_repl_body, (void *) state); +} + +/* cleanup_milter_apply - apply Milter response, non-zero if rejecting */ + +static const char *cleanup_milter_apply(CLEANUP_STATE *state, const char *event, + const char *resp) +{ + const char *myname = "cleanup_milter_apply"; + const char *action; + const char *text; + const char *attr; + const char *ret = 0; + + if (msg_verbose) + msg_info("%s: %s", myname, resp); + + /* + * Don't process our own milter_header/body checks replies. See comments + * in cleanup_milter_hbc_extend(). + */ + if (cleanup_milter_hbc_reply && + strcmp(resp, STR(cleanup_milter_hbc_reply)) == 0) + return (0); + + /* + * Don't process Milter replies that are redundant because header/body + * checks already decided that we will not receive the message; or Milter + * replies that would have conflicting effect with the outcome of + * header/body checks (for example, header_checks "discard" action + * followed by Milter "reject" reply). Logging both actions would look + * silly. + */ + if (CLEANUP_MILTER_REJECTING_OR_DISCARDING_MESSAGE(state)) { + if (msg_verbose) + msg_info("%s: ignoring redundant or conflicting milter reply: %s", + state->queue_id, resp); + return (0); + } + + /* + * Sanity check. + */ + if (state->client_name == 0) + msg_panic("%s: missing client info initialization", myname); + + /* + * We don't report errors that were already reported by the content + * editing call-back routines. See cleanup_milter_error() above. + */ + if (CLEANUP_OUT_OK(state) == 0) + return (0); + switch (resp[0]) { + case 'H': + /* XXX Should log the reason here. */ + if (state->flags & CLEANUP_FLAG_HOLD) + return (0); + state->flags |= CLEANUP_FLAG_HOLD; + action = "milter-hold"; + text = "milter triggers HOLD action"; + break; + case 'D': + state->flags |= CLEANUP_FLAG_DISCARD; + action = "milter-discard"; + text = "milter triggers DISCARD action"; + break; + case 'S': + /* XXX Can this happen after end-of-message? */ + state->flags |= CLEANUP_STAT_CONT; + action = "milter-reject"; + text = cleanup_strerror(CLEANUP_STAT_CONT); + break; + + /* + * Override permanent reject with temporary reject. This happens when + * the cleanup server has to bounce (hard reject) but is unable to + * store the message (soft reject). After a temporary reject we stop + * inspecting queue file records, so it can't be overruled by + * something else. + * + * CLEANUP_STAT_CONT and CLEANUP_STAT_DEFER both update the reason + * attribute, but CLEANUP_STAT_DEFER takes precedence. It terminates + * queue record processing, and prevents bounces from being sent. + */ + case '4': + CLEANUP_MILTER_SET_SMTP_REPLY(state, resp); + ret = state->reason; + state->errs |= CLEANUP_STAT_DEFER; + action = "milter-reject"; + text = resp + 4; + break; + case '5': + CLEANUP_MILTER_SET_SMTP_REPLY(state, resp); + ret = state->reason; + state->errs |= CLEANUP_STAT_CONT; + action = "milter-reject"; + text = resp + 4; + break; + default: + msg_panic("%s: unexpected mail filter reply: %s", myname, resp); + } + vstring_sprintf(state->temp1, "%s: %s: %s from %s[%s]: %s;", + state->queue_id, action, event, state->client_name, + state->client_addr, text); + if (state->sender) + vstring_sprintf_append(state->temp1, " from=<%s>", + info_log_addr_form_sender(state->sender)); + if (state->recip) + vstring_sprintf_append(state->temp1, " to=<%s>", + info_log_addr_form_recipient(state->recip)); + if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_PROTO_NAME)) != 0) + vstring_sprintf_append(state->temp1, " proto=%s", attr); + if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_HELO_NAME)) != 0) + vstring_sprintf_append(state->temp1, " helo=<%s>", attr); + msg_info("%s", vstring_str(state->temp1)); + + return (ret); +} + +/* cleanup_milter_client_init - initialize real or ersatz client info */ + +static void cleanup_milter_client_init(CLEANUP_STATE *state) +{ + static const INET_PROTO_INFO *proto_info; + const char *proto_attr; + + /* + * Either the cleanup client specifies a name, address and protocol, or + * we have a local submission and pretend localhost/127.0.0.1/AF_INET. + */ +#define NO_CLIENT_PORT "0" + + state->client_name = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_NAME); + state->reverse_name = + nvtable_find(state->attr, MAIL_ATTR_ACT_REVERSE_CLIENT_NAME); + state->client_addr = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_ADDR); + state->client_port = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_PORT); + proto_attr = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_AF); + state->server_addr = nvtable_find(state->attr, MAIL_ATTR_ACT_SERVER_ADDR); + state->server_port = nvtable_find(state->attr, MAIL_ATTR_ACT_SERVER_PORT); + + if (state->client_name == 0 || state->client_addr == 0 || proto_attr == 0 + || !alldig(proto_attr)) { + state->client_name = "localhost"; +#ifdef AF_INET6 + if (proto_info == 0) + proto_info = inet_proto_info(); + if (proto_info->sa_family_list[0] == PF_INET6) { + state->client_addr = "::1"; + state->client_af = AF_INET6; + } else +#endif + { + state->client_addr = "127.0.0.1"; + state->client_af = AF_INET; + } + state->server_addr = state->client_addr; + } else + state->client_af = atoi(proto_attr); + if (state->reverse_name == 0) + state->reverse_name = state->client_name; + /* Compatibility with pre-2.5 queue files. */ + if (state->client_port == 0) { + state->client_port = NO_CLIENT_PORT; + state->server_port = state->client_port; + } +} + +/* cleanup_milter_inspect - run message through mail filter */ + +void cleanup_milter_inspect(CLEANUP_STATE *state, MILTERS *milters) +{ + const char *myname = "cleanup_milter"; + const char *resp; + + if (msg_verbose) + msg_info("enter %s", myname); + + /* + * Initialize, in case we're called via smtpd(8). + */ + if (state->client_name == 0) + cleanup_milter_client_init(state); + + /* + * Prologue: prepare for Milter header/body checks. + */ + if (*var_milt_head_checks) + cleanup_milter_header_checks_reinit(state); + + /* + * Process mail filter replies. The reply format is verified by the mail + * filter library. + */ + if ((resp = milter_message(milters, state->handle->stream, + state->data_offset, state->auto_hdrs)) != 0) + cleanup_milter_apply(state, "END-OF-MESSAGE", resp); + + /* + * Epilogue: finalize Milter header/body checks. + */ + if (*var_milt_head_checks) + cleanup_milter_hbc_finish(state); + + if (msg_verbose) + msg_info("leave %s", myname); +} + +/* cleanup_milter_emul_mail - emulate connect/ehlo/mail event */ + +void cleanup_milter_emul_mail(CLEANUP_STATE *state, + MILTERS *milters, + const char *addr) +{ + const char *resp; + const char *helo; + const char *argv[2]; + + /* + * Per-connection initialization. + */ + milter_macro_callback(milters, cleanup_milter_eval, (void *) state); + milter_edit_callback(milters, + cleanup_add_header, cleanup_upd_header, + cleanup_ins_header, cleanup_del_header, + cleanup_chg_from, cleanup_add_rcpt, + cleanup_add_rcpt_par, cleanup_del_rcpt, + cleanup_repl_body, (void *) state); + if (state->client_name == 0) + cleanup_milter_client_init(state); + + /* + * Emulate SMTP events. + */ + if ((resp = milter_conn_event(milters, state->client_name, state->client_addr, + state->client_port, state->client_af)) != 0) { + cleanup_milter_apply(state, "CONNECT", resp); + return; + } +#define PRETEND_ESMTP 1 + + if (CLEANUP_MILTER_OK(state)) { + if ((helo = nvtable_find(state->attr, MAIL_ATTR_ACT_HELO_NAME)) == 0) + helo = state->client_name; + if ((resp = milter_helo_event(milters, helo, PRETEND_ESMTP)) != 0) { + cleanup_milter_apply(state, "EHLO", resp); + return; + } + } + if (CLEANUP_MILTER_OK(state)) { + if (state->milter_ext_from == 0) + state->milter_ext_from = vstring_alloc(100); + /* Sendmail 8.13 does not externalize the null address. */ + if (*addr) + quote_821_local(state->milter_ext_from, addr); + else + vstring_strcpy(state->milter_ext_from, addr); + argv[0] = STR(state->milter_ext_from); + argv[1] = 0; + if ((resp = milter_mail_event(milters, argv)) != 0) { + cleanup_milter_apply(state, "MAIL", resp); + return; + } + } +} + +/* cleanup_milter_emul_rcpt - emulate rcpt event */ + +void cleanup_milter_emul_rcpt(CLEANUP_STATE *state, + MILTERS *milters, + const char *addr) +{ + const char *myname = "cleanup_milter_emul_rcpt"; + const char *resp; + const char *argv[2]; + + /* + * Sanity check. + */ + if (state->client_name == 0) + msg_panic("%s: missing client info initialization", myname); + + /* + * CLEANUP_STAT_CONT and CLEANUP_STAT_DEFER both update the reason + * attribute, but CLEANUP_STAT_DEFER takes precedence. It terminates + * queue record processing, and prevents bounces from being sent. + */ + if (state->milter_ext_rcpt == 0) + state->milter_ext_rcpt = vstring_alloc(100); + /* Sendmail 8.13 does not externalize the null address. */ + if (*addr) + quote_821_local(state->milter_ext_rcpt, addr); + else + vstring_strcpy(state->milter_ext_rcpt, addr); + argv[0] = STR(state->milter_ext_rcpt); + argv[1] = 0; + if ((resp = milter_rcpt_event(milters, MILTER_FLAG_NONE, argv)) != 0 + && cleanup_milter_apply(state, "RCPT", resp) != 0) { + msg_warn("%s: milter configuration error: can't reject recipient " + "in non-smtpd(8) submission", state->queue_id); + msg_warn("%s: message not accepted, try again later", state->queue_id); + CLEANUP_MILTER_SET_REASON(state, "4.3.5 Server configuration error"); + state->errs |= CLEANUP_STAT_DEFER; + } +} + +/* cleanup_milter_emul_data - emulate data event */ + +void cleanup_milter_emul_data(CLEANUP_STATE *state, MILTERS *milters) +{ + const char *myname = "cleanup_milter_emul_data"; + const char *resp; + + /* + * Sanity check. + */ + if (state->client_name == 0) + msg_panic("%s: missing client info initialization", myname); + + if ((resp = milter_data_event(milters)) != 0) + cleanup_milter_apply(state, "DATA", resp); +} + +#ifdef TEST + + /* + * Queue file editing driver for regression tests. In this case it is OK to + * report fatal errors after I/O errors. + */ +#include <stdio.h> +#include <msg_vstream.h> +#include <vstring_vstream.h> +#include <mail_addr.h> +#include <mail_version.h> + +#undef msg_verbose + +char *cleanup_path; +VSTRING *cleanup_trace_path; +VSTRING *cleanup_strip_chars; +int cleanup_comm_canon_flags; +MAPS *cleanup_comm_canon_maps; +int cleanup_ext_prop_mask; +ARGV *cleanup_masq_domains; +int cleanup_masq_flags; +MAPS *cleanup_rcpt_bcc_maps; +int cleanup_rcpt_canon_flags; +MAPS *cleanup_rcpt_canon_maps; +MAPS *cleanup_send_bcc_maps; +int cleanup_send_canon_flags; +MAPS *cleanup_send_canon_maps; +int var_dup_filter_limit = DEF_DUP_FILTER_LIMIT; +char *var_empty_addr = DEF_EMPTY_ADDR; +MAPS *cleanup_virt_alias_maps; +char *var_milt_daemon_name = "host.example.com"; +char *var_milt_v = DEF_MILT_V; +MILTERS *cleanup_milters = (MILTERS *) ((char *) sizeof(*cleanup_milters)); +char *var_milt_head_checks = ""; + +/* Dummies to satisfy unused external references. */ + +int cleanup_masquerade_internal(CLEANUP_STATE *state, VSTRING *addr, ARGV *masq_domains) +{ + msg_panic("cleanup_masquerade_internal dummy"); +} + +int cleanup_rewrite_internal(const char *context, VSTRING *result, + const char *addr) +{ + vstring_strcpy(result, addr); + return (0); +} + +int cleanup_map11_internal(CLEANUP_STATE *state, VSTRING *addr, + MAPS *maps, int propagate) +{ + msg_panic("cleanup_map11_internal dummy"); +} + +ARGV *cleanup_map1n_internal(CLEANUP_STATE *state, const char *addr, + MAPS *maps, int propagate) +{ + msg_panic("cleanup_map1n_internal dummy"); +} + +void cleanup_envelope(CLEANUP_STATE *state, int type, const char *buf, + ssize_t len) +{ + msg_panic("cleanup_envelope dummy"); +} + +static void usage(void) +{ + msg_warn("usage:"); + msg_warn(" verbose on|off"); + msg_warn(" open pathname"); + msg_warn(" close"); + msg_warn(" add_header index name [value]"); + msg_warn(" ins_header index name [value]"); + msg_warn(" upd_header index name [value]"); + msg_warn(" del_header index name"); + msg_warn(" chg_from addr parameters"); + msg_warn(" add_rcpt addr"); + msg_warn(" add_rcpt_par addr parameters"); + msg_warn(" del_rcpt addr"); + msg_warn(" replbody pathname"); + msg_warn(" header_checks type:name"); +} + +/* flatten_args - unparse partial command line */ + +static void flatten_args(VSTRING *buf, char **argv) +{ + char **cpp; + + VSTRING_RESET(buf); + for (cpp = argv; *cpp; cpp++) { + vstring_strcat(buf, *cpp); + if (cpp[1]) + VSTRING_ADDCH(buf, ' '); + } + VSTRING_TERMINATE(buf); +} + +/* open_queue_file - open an unedited queue file (all-zero dummy PTRs) */ + +static void open_queue_file(CLEANUP_STATE *state, const char *path) +{ + VSTRING *buf = vstring_alloc(100); + off_t curr_offset; + int rec_type; + long msg_seg_len; + long data_offset; + long rcpt_count; + long qmgr_opts; + + if (state->dst != 0) { + msg_warn("closing %s", cleanup_path); + vstream_fclose(state->dst); + state->dst = 0; + myfree(cleanup_path); + cleanup_path = 0; + } + if ((state->dst = vstream_fopen(path, O_RDWR, 0)) == 0) { + msg_warn("open %s: %m", path); + } else { + cleanup_path = mystrdup(path); + for (;;) { + if ((curr_offset = vstream_ftell(state->dst)) < 0) + msg_fatal("file %s: vstream_ftell: %m", cleanup_path); + if ((rec_type = rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE)) < 0) + msg_fatal("file %s: missing SIZE or PTR record", cleanup_path); + if (rec_type == REC_TYPE_SIZE) { + if (sscanf(STR(buf), "%ld %ld %ld %ld", + &msg_seg_len, &data_offset, + &rcpt_count, &qmgr_opts) != 4) + msg_fatal("file %s: bad SIZE record: %s", + cleanup_path, STR(buf)); + state->data_offset = data_offset; + state->xtra_offset = data_offset + msg_seg_len; + } else if (rec_type == REC_TYPE_FROM) { + state->sender_pt_offset = curr_offset; + if (LEN(buf) < REC_TYPE_PTR_PAYL_SIZE + && rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE) != REC_TYPE_PTR) + msg_fatal("file %s: missing PTR record after short sender", + cleanup_path); + if ((state->sender_pt_target = vstream_ftell(state->dst)) < 0) + msg_fatal("file %s: missing END record", cleanup_path); + } else if (rec_type == REC_TYPE_PTR) { + if (state->data_offset < 0) + msg_fatal("file %s: missing SIZE record", cleanup_path); + if (curr_offset < state->data_offset + || curr_offset > state->xtra_offset) { + if (state->append_rcpt_pt_offset < 0) { + state->append_rcpt_pt_offset = curr_offset; + if (atol(STR(buf)) != 0) + msg_fatal("file %s: bad dummy recipient PTR record: %s", + cleanup_path, STR(buf)); + if ((state->append_rcpt_pt_target = + vstream_ftell(state->dst)) < 0) + msg_fatal("file %s: vstream_ftell: %m", cleanup_path); + } else if (curr_offset > state->xtra_offset + && state->append_meta_pt_offset < 0) { + state->append_meta_pt_offset = curr_offset; + if (atol(STR(buf)) != 0) + msg_fatal("file %s: bad dummy meta PTR record: %s", + cleanup_path, STR(buf)); + if ((state->append_meta_pt_target = + vstream_ftell(state->dst)) < 0) + msg_fatal("file %s: vstream_ftell: %m", cleanup_path); + } + } else { + if (state->append_hdr_pt_offset < 0) { + state->append_hdr_pt_offset = curr_offset; + if (atol(STR(buf)) != 0) + msg_fatal("file %s: bad dummy header PTR record: %s", + cleanup_path, STR(buf)); + if ((state->append_hdr_pt_target = + vstream_ftell(state->dst)) < 0) + msg_fatal("file %s: vstream_ftell: %m", cleanup_path); + } + } + } + if (state->append_rcpt_pt_offset > 0 + && state->append_hdr_pt_offset > 0 + && (rec_type == REC_TYPE_END + || state->append_meta_pt_offset > 0)) + break; + } + if (msg_verbose) { + msg_info("append_rcpt_pt_offset %ld append_rcpt_pt_target %ld", + (long) state->append_rcpt_pt_offset, + (long) state->append_rcpt_pt_target); + msg_info("append_hdr_pt_offset %ld append_hdr_pt_target %ld", + (long) state->append_hdr_pt_offset, + (long) state->append_hdr_pt_target); + } + } + vstring_free(buf); +} + +static void close_queue_file(CLEANUP_STATE *state) +{ + (void) vstream_fclose(state->dst); + state->dst = 0; + myfree(cleanup_path); + cleanup_path = 0; +} + +int main(int unused_argc, char **argv) +{ + VSTRING *inbuf = vstring_alloc(100); + VSTRING *arg_buf = vstring_alloc(100); + char *bufp; + int istty = isatty(vstream_fileno(VSTREAM_IN)); + CLEANUP_STATE *state = cleanup_state_alloc((VSTREAM *) 0); + const char *parens = "{}"; + + state->queue_id = mystrdup("NOQUEUE"); + state->sender = mystrdup("sender"); + state->recip = mystrdup("recipient"); + state->client_name = "client_name"; + state->client_addr = "client_addr"; + state->flags |= CLEANUP_FLAG_FILTER_ALL; + + msg_vstream_init(argv[0], VSTREAM_ERR); + var_line_limit = DEF_LINE_LIMIT; + var_header_limit = DEF_HEADER_LIMIT; + var_enable_orcpt = DEF_ENABLE_ORCPT; + var_info_log_addr_form = DEF_INFO_LOG_ADDR_FORM; + + for (;;) { + ARGV *argv; + ssize_t index; + const char *resp = 0; + + if (istty) { + vstream_printf("- "); + vstream_fflush(VSTREAM_OUT); + } + if (vstring_fgets_nonl(inbuf, VSTREAM_IN) == 0) + break; + + bufp = vstring_str(inbuf); + if (!istty) { + vstream_printf("> %s\n", bufp); + vstream_fflush(VSTREAM_OUT); + } + if (*bufp == '#' || *bufp == 0 || allspace(bufp)) + continue; + argv = argv_splitq(bufp, " ", parens); + if (argv->argc == 0) { + msg_warn("missing command"); + } else if (strcmp(argv->argv[0], "?") == 0) { + usage(); + } else if (strcmp(argv->argv[0], "verbose") == 0) { + if (argv->argc != 2) { + msg_warn("bad verbose argument count: %ld", (long) argv->argc); + } else if (strcmp(argv->argv[1], "on") == 0) { + msg_verbose = 2; + } else if (strcmp(argv->argv[1], "off") == 0) { + msg_verbose = 0; + } else { + msg_warn("bad verbose argument"); + } + } else if (strcmp(argv->argv[0], "line_length_limit") == 0) { + if (argv->argc != 2) { + msg_warn("bad line_length_limit argument count: %ld", + (long) argv->argc); + } else if (alldig(argv->argv[1]) == 0) { + msg_warn("bad line_length_limit argument count: %ld", + (long) argv->argc); + } else if ((var_line_limit = atoi(argv->argv[1])) < DEF_LINE_LIMIT) { + msg_warn("bad line_length_limit argument"); + } + } else if (strcmp(argv->argv[0], "open") == 0) { + if (state->dst != 0) { + msg_info("closing %s", VSTREAM_PATH(state->dst)); + close_queue_file(state); + } + if (argv->argc != 2) { + msg_warn("bad open argument count: %ld", (long) argv->argc); + } else { + open_queue_file(state, argv->argv[1]); + } + } else if (strcmp(argv->argv[0], "enable_original_recipient") == 0) { + if (argv->argc == 1) { + msg_info("enable_original_recipient: %d", var_enable_orcpt); + } else if (argv->argc != 2) { + msg_warn("bad enable_original_recipient argument count: %ld", + (long) argv->argc); + } else if (!alldig(argv->argv[1])) { + msg_warn("non-numeric enable_original_recipient argument: %s", + argv->argv[1]); + } else { + var_enable_orcpt = atoi(argv->argv[1]); + } + } else if (state->dst == 0) { + msg_warn("no open queue file"); + } else if (strcmp(argv->argv[0], "close") == 0) { + if (*var_milt_head_checks) { + cleanup_milter_hbc_finish(state); + myfree(var_milt_head_checks); + var_milt_head_checks = ""; + cleanup_milter_header_checks_deinit(); + } + close_queue_file(state); + } else if (cleanup_milter_hbc_reply && LEN(cleanup_milter_hbc_reply)) { + /* Postfix libmilter would skip further requests. */ + msg_info("ignoring: %s %s %s", argv->argv[0], + argv->argc > 1 ? argv->argv[1] : "", + argv->argc > 2 ? argv->argv[2] : ""); + } else if (strcmp(argv->argv[0], "add_header") == 0) { + if (argv->argc < 2) { + msg_warn("bad add_header argument count: %ld", + (long) argv->argc); + } else { + flatten_args(arg_buf, argv->argv + 2); + resp = cleanup_add_header(state, argv->argv[1], " ", STR(arg_buf)); + } + } else if (strcmp(argv->argv[0], "ins_header") == 0) { + if (argv->argc < 3) { + msg_warn("bad ins_header argument count: %ld", + (long) argv->argc); + } else if ((index = atoi(argv->argv[1])) < 1) { + msg_warn("bad ins_header index value"); + } else { + flatten_args(arg_buf, argv->argv + 3); + resp = cleanup_ins_header(state, index, argv->argv[2], " ", STR(arg_buf)); + } + } else if (strcmp(argv->argv[0], "upd_header") == 0) { + if (argv->argc < 3) { + msg_warn("bad upd_header argument count: %ld", + (long) argv->argc); + } else if ((index = atoi(argv->argv[1])) < 1) { + msg_warn("bad upd_header index value"); + } else { + flatten_args(arg_buf, argv->argv + 3); + resp = cleanup_upd_header(state, index, argv->argv[2], " ", STR(arg_buf)); + } + } else if (strcmp(argv->argv[0], "del_header") == 0) { + if (argv->argc != 3) { + msg_warn("bad del_header argument count: %ld", + (long) argv->argc); + } else if ((index = atoi(argv->argv[1])) < 1) { + msg_warn("bad del_header index value"); + } else { + cleanup_del_header(state, index, argv->argv[2]); + } + } else if (strcmp(argv->argv[0], "chg_from") == 0) { + if (argv->argc != 3) { + msg_warn("bad chg_from argument count: %ld", (long) argv->argc); + } else { + char *arg = argv->argv[2]; + const char *err; + + if (*arg == parens[0] + && (err = extpar(&arg, parens, EXTPAR_FLAG_NONE)) != 0) { + msg_warn("%s in \"%s\"", err, arg); + } else { + cleanup_chg_from(state, argv->argv[1], arg); + } + } + } else if (strcmp(argv->argv[0], "add_rcpt") == 0) { + if (argv->argc != 2) { + msg_warn("bad add_rcpt argument count: %ld", (long) argv->argc); + } else { + cleanup_add_rcpt(state, argv->argv[1]); + } + } else if (strcmp(argv->argv[0], "add_rcpt_par") == 0) { + if (argv->argc != 3) { + msg_warn("bad add_rcpt_par argument count: %ld", + (long) argv->argc); + } else { + cleanup_add_rcpt_par(state, argv->argv[1], argv->argv[2]); + } + } else if (strcmp(argv->argv[0], "del_rcpt") == 0) { + if (argv->argc != 2) { + msg_warn("bad del_rcpt argument count: %ld", (long) argv->argc); + } else { + cleanup_del_rcpt(state, argv->argv[1]); + } + } else if (strcmp(argv->argv[0], "replbody") == 0) { + if (argv->argc != 2) { + msg_warn("bad replbody argument count: %ld", (long) argv->argc); + } else { + VSTREAM *fp; + VSTRING *buf; + + if ((fp = vstream_fopen(argv->argv[1], O_RDONLY, 0)) == 0) { + msg_warn("open %s file: %m", argv->argv[1]); + } else { + buf = vstring_alloc(100); + cleanup_repl_body(state, MILTER_BODY_START, + REC_TYPE_NORM, buf); + while (vstring_get_nonl(buf, fp) != VSTREAM_EOF) + cleanup_repl_body(state, MILTER_BODY_LINE, + REC_TYPE_NORM, buf); + cleanup_repl_body(state, MILTER_BODY_END, + REC_TYPE_NORM, buf); + vstring_free(buf); + vstream_fclose(fp); + } + } + } else if (strcmp(argv->argv[0], "header_checks") == 0) { + if (argv->argc != 2) { + msg_warn("bad header_checks argument count: %ld", + (long) argv->argc); + } else if (*var_milt_head_checks) { + msg_warn("can't change header checks"); + } else { + var_milt_head_checks = mystrdup(argv->argv[1]); + cleanup_milter_header_checks_init(); + } + } else if (strcmp(argv->argv[0], "sender_bcc_maps") == 0) { + if (argv->argc != 2) { + msg_warn("bad sender_bcc_maps argument count: %ld", + (long) argv->argc); + } else { + if (cleanup_send_bcc_maps) + maps_free(cleanup_send_bcc_maps); + cleanup_send_bcc_maps = + maps_create("sender_bcc_maps", argv->argv[1], + DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX + | DICT_FLAG_UTF8_REQUEST); + state->flags |= CLEANUP_FLAG_BCC_OK; + var_rcpt_delim = ""; + } + } else { + msg_warn("bad command: %s", argv->argv[0]); + } + argv_free(argv); + if (resp) + cleanup_milter_apply(state, "END-OF-MESSAGE", resp); + } + vstring_free(inbuf); + vstring_free(arg_buf); + if (state->append_meta_pt_offset >= 0) { + if (state->flags) + msg_info("flags = %s", cleanup_strflags(state->flags)); + if (state->errs) + msg_info("errs = %s", cleanup_strerror(state->errs)); + } + cleanup_state_free(state); + if (*var_milt_head_checks) + myfree(var_milt_head_checks); + + return (0); +} + +#endif |