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Diffstat (limited to 'src/qmqpd/qmqpd.c')
| -rw-r--r-- | src/qmqpd/qmqpd.c | 864 |
1 files changed, 864 insertions, 0 deletions
diff --git a/src/qmqpd/qmqpd.c b/src/qmqpd/qmqpd.c new file mode 100644 index 0000000..2be6d7b --- /dev/null +++ b/src/qmqpd/qmqpd.c @@ -0,0 +1,864 @@ +/*++ +/* NAME +/* qmqpd 8 +/* SUMMARY +/* Postfix QMQP server +/* SYNOPSIS +/* \fBqmqpd\fR [generic Postfix daemon options] +/* DESCRIPTION +/* The Postfix QMQP server receives one message per connection. +/* Each message is piped through the \fBcleanup\fR(8) +/* daemon, and is placed into the \fBincoming\fR queue as one +/* single queue file. The program expects to be run from the +/* \fBmaster\fR(8) process manager. +/* +/* The QMQP server implements one access policy: only explicitly +/* authorized client hosts are allowed to use the service. +/* SECURITY +/* .ad +/* .fi +/* The QMQP server is moderately security-sensitive. It talks to QMQP +/* clients and to DNS servers on the network. The QMQP server can be +/* run chrooted at fixed low privilege. +/* DIAGNOSTICS +/* Problems and transactions are logged to \fBsyslogd\fR(8) +/* or \fBpostlogd\fR(8). +/* BUGS +/* The QMQP protocol provides only one server reply per message +/* delivery. It is therefore not possible to reject individual +/* recipients. +/* +/* The QMQP protocol requires the server to receive the entire +/* message before replying. If a message is malformed, or if any +/* netstring component is longer than acceptable, Postfix replies +/* immediately and closes the connection. It is left up to the +/* client to handle the situation. +/* CONFIGURATION PARAMETERS +/* .ad +/* .fi +/* Changes to \fBmain.cf\fR are picked up automatically, as \fBqmqpd\fR(8) +/* processes run for only a limited amount of time. Use the command +/* "\fBpostfix reload\fR" to speed up a change. +/* +/* The text below provides only a parameter summary. See +/* \fBpostconf\fR(5) for more details including examples. +/* CONTENT INSPECTION CONTROLS +/* .ad +/* .fi +/* .IP "\fBcontent_filter (empty)\fR" +/* After the message is queued, send the entire message to the +/* specified \fItransport:destination\fR. +/* .IP "\fBreceive_override_options (empty)\fR" +/* Enable or disable recipient validation, built-in content +/* filtering, or address mapping. +/* SMTPUTF8 CONTROLS +/* .ad +/* .fi +/* Preliminary SMTPUTF8 support is introduced with Postfix 3.0. +/* .IP "\fBsmtputf8_enable (yes)\fR" +/* Enable preliminary SMTPUTF8 support for the protocols described +/* in RFC 6531..6533. +/* .IP "\fBsmtputf8_autodetect_classes (sendmail, verify)\fR" +/* Detect that a message requires SMTPUTF8 support for the specified +/* mail origin classes. +/* .PP +/* Available in Postfix version 3.2 and later: +/* .IP "\fBenable_idna2003_compatibility (no)\fR" +/* Enable 'transitional' compatibility between IDNA2003 and IDNA2008, +/* when converting UTF-8 domain names to/from the ASCII form that is +/* used for DNS lookups. +/* RESOURCE AND RATE CONTROLS +/* .ad +/* .fi +/* .IP "\fBline_length_limit (2048)\fR" +/* Upon input, long lines are chopped up into pieces of at most +/* this length; upon delivery, long lines are reconstructed. +/* .IP "\fBhopcount_limit (50)\fR" +/* The maximal number of Received: message headers that is allowed +/* in the primary message headers. +/* .IP "\fBmessage_size_limit (10240000)\fR" +/* The maximal size in bytes of a message, including envelope information. +/* .IP "\fBqmqpd_timeout (300s)\fR" +/* The time limit for sending or receiving information over the network. +/* TROUBLE SHOOTING CONTROLS +/* .ad +/* .fi +/* .IP "\fBdebug_peer_level (2)\fR" +/* The increment in verbose logging level when a remote client or +/* server matches a pattern in the debug_peer_list parameter. +/* .IP "\fBdebug_peer_list (empty)\fR" +/* Optional list of remote client or server hostname or network +/* address patterns that cause the verbose logging level to increase +/* by the amount specified in $debug_peer_level. +/* .IP "\fBsoft_bounce (no)\fR" +/* Safety net to keep mail queued that would otherwise be returned to +/* the sender. +/* TARPIT CONTROLS +/* .ad +/* .fi +/* .IP "\fBqmqpd_error_delay (1s)\fR" +/* How long the Postfix QMQP server will pause before sending a negative +/* reply to the remote QMQP client. +/* MISCELLANEOUS CONTROLS +/* .ad +/* .fi +/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR" +/* The default location of the Postfix main.cf and master.cf +/* configuration files. +/* .IP "\fBdaemon_timeout (18000s)\fR" +/* How much time a Postfix daemon process may take to handle a +/* request before it is terminated by a built-in watchdog timer. +/* .IP "\fBipc_timeout (3600s)\fR" +/* The time limit for sending or receiving information over an internal +/* communication channel. +/* .IP "\fBmax_idle (100s)\fR" +/* The maximum amount of time that an idle Postfix daemon process waits +/* for an incoming connection before terminating voluntarily. +/* .IP "\fBmax_use (100)\fR" +/* The maximal number of incoming connections that a Postfix daemon +/* process will service before terminating voluntarily. +/* .IP "\fBprocess_id (read-only)\fR" +/* The process ID of a Postfix command or daemon process. +/* .IP "\fBprocess_name (read-only)\fR" +/* The process name of a Postfix command or daemon process. +/* .IP "\fBqmqpd_authorized_clients (empty)\fR" +/* What remote QMQP clients are allowed to connect to the Postfix QMQP +/* server port. +/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR" +/* The location of the Postfix top-level queue directory. +/* .IP "\fBsyslog_facility (mail)\fR" +/* The syslog facility of Postfix logging. +/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR" +/* A prefix that is prepended to the process name in syslog +/* records, so that, for example, "smtpd" becomes "prefix/smtpd". +/* .IP "\fBverp_delimiter_filter (-=+)\fR" +/* The characters Postfix accepts as VERP delimiter characters on the +/* Postfix \fBsendmail\fR(1) command line and in SMTP commands. +/* .PP +/* Available in Postfix version 2.5 and later: +/* .IP "\fBqmqpd_client_port_logging (no)\fR" +/* Enable logging of the remote QMQP client port in addition to +/* the hostname and IP address. +/* .PP +/* Available in Postfix 3.3 and later: +/* .IP "\fBservice_name (read-only)\fR" +/* The master.cf service name of a Postfix daemon process. +/* SEE ALSO +/* http://cr.yp.to/proto/qmqp.html, QMQP protocol +/* cleanup(8), message canonicalization +/* master(8), process manager +/* postlogd(8), Postfix logging +/* syslogd(8), system logging +/* README FILES +/* .ad +/* .fi +/* Use "\fBpostconf readme_directory\fR" or +/* "\fBpostconf html_directory\fR" to locate this information. +/* .na +/* .nf +/* QMQP_README, Postfix ezmlm-idx howto. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* HISTORY +/* .ad +/* .fi +/* The qmqpd service was introduced with Postfix version 1.1. +/* 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 <string.h> +#include <unistd.h> +#include <stdlib.h> +#include <ctype.h> +#include <stdarg.h> + +/* Utility library. */ + +#include <msg.h> +#include <mymalloc.h> +#include <vstring.h> +#include <vstream.h> +#include <netstring.h> +#include <dict.h> +#include <inet_proto.h> + +/* Global library. */ + +#include <mail_params.h> +#include <mail_version.h> +#include <record.h> +#include <rec_type.h> +#include <mail_proto.h> +#include <cleanup_user.h> +#include <mail_date.h> +#include <mail_conf.h> +#include <debug_peer.h> +#include <mail_stream.h> +#include <namadr_list.h> +#include <quote_822_local.h> +#include <match_parent_style.h> +#include <lex_822.h> +#include <verp_sender.h> +#include <input_transp.h> +#include <smtputf8.h> + +/* Single-threaded server skeleton. */ + +#include <mail_server.h> + +/* Application-specific */ + +#include <qmqpd.h> + + /* + * Tunable parameters. Make sure that there is some bound on the length of a + * netstring, so that the mail system stays in control even when a malicious + * client sends netstrings of unreasonable length. The recipient count limit + * is enforced by the message size limit. + */ +int var_qmqpd_timeout; +int var_qmqpd_err_sleep; +char *var_filter_xport; +char *var_qmqpd_clients; +char *var_input_transp; +bool var_qmqpd_client_port_log; + + /* + * Silly little macros. + */ +#define STR(x) vstring_str(x) +#define LEN(x) VSTRING_LEN(x) + +#define DO_LOG 1 +#define DONT_LOG 0 + + /* + * Access control. This service should be exposed only to explicitly + * authorized clients. There is no default authorization. + */ +static NAMADR_LIST *qmqpd_clients; + + /* + * Transparency: before mail is queued, do we allow address mapping, + * automatic bcc, header/body checks? + */ +int qmqpd_input_transp_mask; + +/* qmqpd_open_file - open a queue file */ + +static void qmqpd_open_file(QMQPD_STATE *state) +{ + int cleanup_flags; + + /* + * Connect to the cleanup server. Log client name/address with queue ID. + */ + cleanup_flags = input_transp_cleanup(CLEANUP_FLAG_MASK_EXTERNAL, + qmqpd_input_transp_mask); + cleanup_flags |= smtputf8_autodetect(MAIL_SRC_MASK_QMQPD); + state->dest = mail_stream_service(MAIL_CLASS_PUBLIC, var_cleanup_service); + if (state->dest == 0 + || attr_print(state->dest->stream, ATTR_FLAG_NONE, + SEND_ATTR_INT(MAIL_ATTR_FLAGS, cleanup_flags), + ATTR_TYPE_END) != 0) + msg_fatal("unable to connect to the %s %s service", + MAIL_CLASS_PUBLIC, var_cleanup_service); + state->cleanup = state->dest->stream; + state->queue_id = mystrdup(state->dest->id); + msg_info("%s: client=%s", state->queue_id, state->namaddr); + + /* + * Record the time of arrival. Optionally, enable content filtering (not + * bloody likely, but present for the sake of consistency with all other + * Postfix points of entrance). + */ + rec_fprintf(state->cleanup, REC_TYPE_TIME, REC_TYPE_TIME_FORMAT, + REC_TYPE_TIME_ARG(state->arrival_time)); + if (*var_filter_xport) + rec_fprintf(state->cleanup, REC_TYPE_FILT, "%s", var_filter_xport); +} + +/* qmqpd_read_content - receive message content */ + +static void qmqpd_read_content(QMQPD_STATE *state) +{ + state->where = "receiving message content"; + netstring_get(state->client, state->message, var_message_limit); +} + +/* qmqpd_copy_sender - copy envelope sender */ + +static void qmqpd_copy_sender(QMQPD_STATE *state) +{ + char *end_prefix; + char *end_origin; + int verp_requested; + static char verp_delims[] = "-="; + + /* + * If the sender address looks like prefix@origin-@[], then request + * variable envelope return path delivery, with an envelope sender + * address of prefi@origin, and with VERP delimiters of x and =. This + * way, the recipients will see envelope sender addresses that look like: + * prefixuser=domain@origin. + */ + state->where = "receiving sender address"; + netstring_get(state->client, state->buf, var_line_limit); + VSTRING_TERMINATE(state->buf); + verp_requested = + ((end_origin = vstring_end(state->buf) - 4) > STR(state->buf) + && strcmp(end_origin, "-@[]") == 0 + && (end_prefix = strchr(STR(state->buf), '@')) != 0 /* XXX */ + && --end_prefix < end_origin - 2 /* non-null origin */ + && end_prefix > STR(state->buf)); /* non-null prefix */ + if (verp_requested) { + verp_delims[0] = end_prefix[0]; + if (verp_delims_verify(verp_delims) != 0) { + state->err |= CLEANUP_STAT_CONT; /* XXX */ + vstring_sprintf(state->why_rejected, "Invalid VERP delimiters: \"%s\". Need two characters from \"%s\"", + verp_delims, var_verp_filter); + } + memmove(end_prefix, end_prefix + 1, end_origin - end_prefix - 1); + vstring_truncate(state->buf, end_origin - STR(state->buf) - 1); + } + if (state->err == CLEANUP_STAT_OK + && REC_PUT_BUF(state->cleanup, REC_TYPE_FROM, state->buf) < 0) + state->err = CLEANUP_STAT_WRITE; + if (verp_requested) + if (state->err == CLEANUP_STAT_OK + && rec_put(state->cleanup, REC_TYPE_VERP, verp_delims, 2) < 0) + state->err = CLEANUP_STAT_WRITE; + state->sender = mystrndup(STR(state->buf), LEN(state->buf)); +} + +/* qmqpd_write_attributes - save session attributes */ + +static void qmqpd_write_attributes(QMQPD_STATE *state) +{ + + /* + * Logging attributes, also used for XFORWARD. + */ + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_LOG_CLIENT_NAME, state->name); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_LOG_CLIENT_ADDR, state->rfc_addr); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_LOG_CLIENT_PORT, state->port); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_LOG_ORIGIN, state->namaddr); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_LOG_PROTO_NAME, state->protocol); + + /* + * For consistency with the smtpd Milter client, we need to provide the + * real client attributes to the cleanup Milter client. This does not + * matter much with qmqpd which speaks to trusted clients only, but we + * want to be sure that the cleanup input protocol is ready when a new + * type of network daemon is added to receive mail from the Internet. + * + * See also the comments in smtpd.c. + */ + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_ACT_CLIENT_NAME, state->name); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_ACT_CLIENT_ADDR, state->addr); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_ACT_CLIENT_PORT, state->port); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%u", + MAIL_ATTR_ACT_CLIENT_AF, state->addr_family); + rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s", + MAIL_ATTR_ACT_PROTO_NAME, state->protocol); + + /* XXX What about the address rewriting context? */ +} + +/* qmqpd_copy_recipients - copy message recipients */ + +static void qmqpd_copy_recipients(QMQPD_STATE *state) +{ + int ch; + + /* + * Remember the first recipient. We are done when we read the over-all + * netstring terminator. + * + * XXX This approach violates abstractions, but it is a heck of a lot more + * convenient than counting the over-all byte count down to zero, like + * qmail does. + */ + state->where = "receiving recipient address"; + while ((ch = VSTREAM_GETC(state->client)) != ',') { + vstream_ungetc(state->client, ch); + netstring_get(state->client, state->buf, var_line_limit); + if (state->err == CLEANUP_STAT_OK + && REC_PUT_BUF(state->cleanup, REC_TYPE_RCPT, state->buf) < 0) + state->err = CLEANUP_STAT_WRITE; + state->rcpt_count++; + if (state->recipient == 0) + state->recipient = mystrndup(STR(state->buf), LEN(state->buf)); + } +} + +/* qmqpd_next_line - get line from buffer, return last char, newline, or -1 */ + +static int qmqpd_next_line(VSTRING *message, char **start, int *len, + char **next) +{ + char *beyond = STR(message) + LEN(message); + char *enough = *next + var_line_limit; + char *cp; + + /* + * Stop at newline or at some limit. Don't look beyond the end of the + * buffer. + */ +#define UCHARPTR(x) ((unsigned char *) (x)) + + for (cp = *start = *next; /* void */ ; cp++) { + if (cp >= beyond) + return ((*len = (*next = cp) - *start) > 0 ? UCHARPTR(cp)[-1] : -1); + if (*cp == '\n') + return ((*len = cp - *start), (*next = cp + 1), '\n'); + if (cp >= enough) + return ((*len = cp - *start), (*next = cp), UCHARPTR(cp)[-1]); + } +} + +/* qmqpd_write_content - write the message content segment */ + +static void qmqpd_write_content(QMQPD_STATE *state) +{ + char *start; + char *next; + int len; + int rec_type; + int first = 1; + int ch; + + /* + * Start the message content segment. Prepend our own Received: header to + * the message content. List the recipient only when a message has one + * recipient. Otherwise, don't list the recipient to avoid revealing Bcc: + * recipients that are supposed to be invisible. + */ + rec_fputs(state->cleanup, REC_TYPE_MESG, ""); + rec_fprintf(state->cleanup, REC_TYPE_NORM, "Received: from %s (%s [%s])", + state->name, state->name, state->rfc_addr); + if (state->rcpt_count == 1 && state->recipient) { + rec_fprintf(state->cleanup, REC_TYPE_NORM, + "\tby %s (%s) with %s id %s", + var_myhostname, var_mail_name, + state->protocol, state->queue_id); + quote_822_local(state->buf, state->recipient); + rec_fprintf(state->cleanup, REC_TYPE_NORM, + "\tfor <%s>; %s", STR(state->buf), + mail_date(state->arrival_time.tv_sec)); + } else { + rec_fprintf(state->cleanup, REC_TYPE_NORM, + "\tby %s (%s) with %s", + var_myhostname, var_mail_name, state->protocol); + rec_fprintf(state->cleanup, REC_TYPE_NORM, + "\tid %s; %s", state->queue_id, + mail_date(state->arrival_time.tv_sec)); + } +#ifdef RECEIVED_ENVELOPE_FROM + quote_822_local(state->buf, state->sender); + rec_fprintf(state->cleanup, REC_TYPE_NORM, + "\t(envelope-from <%s>)", STR(state->buf)); +#endif + + /* + * Write the message content. + * + * XXX Force an empty record when the queue file content begins with + * whitespace, so that it won't be considered as being part of our own + * Received: header. What an ugly Kluge. + * + * XXX Deal with UNIX-style From_ lines at the start of message content just + * in case. + */ + for (next = STR(state->message); /* void */ ; /* void */ ) { + if ((ch = qmqpd_next_line(state->message, &start, &len, &next)) < 0) + break; + if (ch == '\n') + rec_type = REC_TYPE_NORM; + else + rec_type = REC_TYPE_CONT; + if (first) { + if (strncmp(start + strspn(start, ">"), "From ", 5) == 0) { + rec_fprintf(state->cleanup, rec_type, + "X-Mailbox-Line: %.*s", len, start); + continue; + } + first = 0; + if (len > 0 && IS_SPACE_TAB(start[0])) + rec_put(state->cleanup, REC_TYPE_NORM, "", 0); + } + if (rec_put(state->cleanup, rec_type, start, len) < 0) { + state->err = CLEANUP_STAT_WRITE; + return; + } + } +} + +/* qmqpd_close_file - close queue file */ + +static void qmqpd_close_file(QMQPD_STATE *state) +{ + + /* + * Send the end-of-segment markers. + */ + if (state->err == CLEANUP_STAT_OK) + if (rec_fputs(state->cleanup, REC_TYPE_XTRA, "") < 0 + || rec_fputs(state->cleanup, REC_TYPE_END, "") < 0 + || vstream_fflush(state->cleanup)) + state->err = CLEANUP_STAT_WRITE; + + /* + * Finish the queue file or finish the cleanup conversation. + */ + if (state->err == 0) + state->err = mail_stream_finish(state->dest, state->why_rejected); + else + mail_stream_cleanup(state->dest); + state->dest = 0; +} + +/* qmqpd_reply - send status to client and optionally log message */ + +static void qmqpd_reply(QMQPD_STATE *state, int log_message, + int status_code, const char *fmt,...) +{ + va_list ap; + + /* + * Optionally change hard errors into retryable ones. Send the reply and + * optionally log it. Always insert a delay before reporting a problem. + * This slows down software run-away conditions. + */ + if (status_code == QMQPD_STAT_HARD && var_soft_bounce) + status_code = QMQPD_STAT_RETRY; + VSTRING_RESET(state->buf); + VSTRING_ADDCH(state->buf, status_code); + va_start(ap, fmt); + vstring_vsprintf_append(state->buf, fmt, ap); + va_end(ap); + NETSTRING_PUT_BUF(state->client, state->buf); + if (log_message) + (status_code == QMQPD_STAT_OK ? msg_info : msg_warn) ("%s: %s: %s", + state->queue_id, state->namaddr, STR(state->buf) + 1); + if (status_code != QMQPD_STAT_OK) + sleep(var_qmqpd_err_sleep); + netstring_fflush(state->client); +} + +/* qmqpd_send_status - send mail transaction completion status */ + +static void qmqpd_send_status(QMQPD_STATE *state) +{ + + /* + * One message may suffer from multiple errors, so complain only about + * the most severe error. + * + * See also: smtpd.c + */ + state->where = "sending completion status"; + + if (state->err == CLEANUP_STAT_OK) { + qmqpd_reply(state, DONT_LOG, QMQPD_STAT_OK, + "Ok: queued as %s", state->queue_id); + } else if ((state->err & CLEANUP_STAT_DEFER) != 0) { + qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY, + "Error: %s", STR(state->why_rejected)); + } else if ((state->err & CLEANUP_STAT_BAD) != 0) { + qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY, + "Error: internal error %d", state->err); + } else if ((state->err & CLEANUP_STAT_SIZE) != 0) { + qmqpd_reply(state, DO_LOG, QMQPD_STAT_HARD, + "Error: message too large"); + } else if ((state->err & CLEANUP_STAT_HOPS) != 0) { + qmqpd_reply(state, DO_LOG, QMQPD_STAT_HARD, + "Error: too many hops"); + } else if ((state->err & CLEANUP_STAT_CONT) != 0) { + qmqpd_reply(state, DO_LOG, STR(state->why_rejected)[0] == '4' ? + QMQPD_STAT_RETRY : QMQPD_STAT_HARD, + "Error: %s", STR(state->why_rejected)); + } else if ((state->err & CLEANUP_STAT_WRITE) != 0) { + qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY, + "Error: queue file write error"); + } else if ((state->err & CLEANUP_STAT_RCPT) != 0) { + qmqpd_reply(state, DO_LOG, QMQPD_STAT_HARD, + "Error: no recipients specified"); + } else { + qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY, + "Error: internal error %d", state->err); + } +} + +/* qmqpd_receive - receive QMQP message+sender+recipients */ + +static void qmqpd_receive(QMQPD_STATE *state) +{ + + /* + * Open a queue file. This must be first so that we can simplify the + * error logging and always include the queue ID information. + */ + qmqpd_open_file(state); + + /* + * Read and ignore the over-all netstring length indicator. + */ + state->where = "receiving QMQP packet header"; + (void) netstring_get_length(state->client); + + /* + * XXX Read the message content into memory, because Postfix expects to + * store the sender before storing the message content. Fixing that + * requires changes to pickup, cleanup, qmgr, and perhaps elsewhere, so + * that will have to happen later when I have more time. However, QMQP is + * used for mailing list distribution, so the bulk of the volume is + * expected to be not message content but recipients, and recipients are + * not accumulated in memory. + */ + qmqpd_read_content(state); + + /* + * Read and write the envelope sender. + */ + qmqpd_copy_sender(state); + + /* + * Record some session attributes. + */ + qmqpd_write_attributes(state); + + /* + * Read and write the envelope recipients, including the optional big + * brother recipient. + */ + qmqpd_copy_recipients(state); + + /* + * Start the message content segment, prepend our own Received: header, + * and write the message content. + */ + if (state->err == 0) + qmqpd_write_content(state); + + /* + * Close the queue file. + */ + qmqpd_close_file(state); + + /* + * Report the completion status to the client. + */ + qmqpd_send_status(state); +} + +/* qmqpd_proto - speak the QMQP "protocol" */ + +static void qmqpd_proto(QMQPD_STATE *state) +{ + int status; + + netstring_setup(state->client, var_qmqpd_timeout); + + switch (status = vstream_setjmp(state->client)) { + + default: + msg_panic("qmqpd_proto: unknown status %d", status); + + case NETSTRING_ERR_EOF: + state->reason = "lost connection"; + break; + + case NETSTRING_ERR_TIME: + state->reason = "read/write timeout"; + break; + + case NETSTRING_ERR_FORMAT: + state->reason = "netstring format error"; + if (vstream_setjmp(state->client) == 0) + if (state->reason && state->where) + qmqpd_reply(state, DONT_LOG, QMQPD_STAT_HARD, "%s while %s", + state->reason, state->where); + break; + + case NETSTRING_ERR_SIZE: + state->reason = "netstring length exceeds storage limit"; + if (vstream_setjmp(state->client) == 0) + if (state->reason && state->where) + qmqpd_reply(state, DONT_LOG, QMQPD_STAT_HARD, "%s while %s", + state->reason, state->where); + break; + + case 0: + + /* + * See if we want to talk to this client at all. + */ + if (namadr_list_match(qmqpd_clients, state->name, state->addr) != 0) { + qmqpd_receive(state); + } else if (qmqpd_clients->error == 0) { + qmqpd_reply(state, DONT_LOG, QMQPD_STAT_HARD, + "Error: %s is not authorized to use this service", + state->namaddr); + } else { + qmqpd_reply(state, DONT_LOG, QMQPD_STAT_RETRY, + "Error: server configuration error"); + } + break; + } + + /* + * Log abnormal session termination. Indicate the last recognized state + * before things went wrong. + */ + if (state->reason && state->where) + msg_info("%s: %s: %s while %s", + state->queue_id ? state->queue_id : "NOQUEUE", + state->namaddr, state->reason, state->where); +} + +/* qmqpd_service - service one client */ + +static void qmqpd_service(VSTREAM *stream, char *unused_service, char **argv) +{ + QMQPD_STATE *state; + + /* + * Sanity check. This service takes no command-line arguments. + */ + if (argv[0]) + msg_fatal("unexpected command-line argument: %s", argv[0]); + + /* + * For sanity, require that at least one of INET or INET6 is enabled. + * Otherwise, we can't look up interface information, and we can't + * convert names or addresses. + */ + if (inet_proto_info()->ai_family_list[0] == 0) + msg_fatal("all network protocols are disabled (%s = %s)", + VAR_INET_PROTOCOLS, var_inet_protocols); + + /* + * This routine runs when a client has connected to our network port. + * Look up and sanitize the peer name and initialize some connection- + * specific state. + */ + state = qmqpd_state_alloc(stream); + + /* + * See if we need to turn on verbose logging for this client. + */ + debug_peer_check(state->name, state->addr); + + /* + * Provide the QMQP service. + */ + msg_info("connect from %s", state->namaddr); + qmqpd_proto(state); + msg_info("disconnect from %s", state->namaddr); + + /* + * After the client has gone away, clean up whatever we have set up at + * connection time. + */ + debug_peer_restore(); + qmqpd_state_free(state); +} + +/* pre_accept - see if tables have changed */ + +static void pre_accept(char *unused_name, char **unused_argv) +{ + const char *table; + + if ((table = dict_changed_name()) != 0) { + msg_info("table %s has changed -- restarting", table); + exit(0); + } +} + +/* pre_jail_init - pre-jail initialization */ + +static void pre_jail_init(char *unused_name, char **unused_argv) +{ + debug_peer_init(); + qmqpd_clients = + namadr_list_init(VAR_QMQPD_CLIENTS, MATCH_FLAG_RETURN + | match_parent_style(VAR_QMQPD_CLIENTS), + var_qmqpd_clients); +} + +/* post_jail_init - post-jail initialization */ + +static void post_jail_init(char *unused_name, char **unused_argv) +{ + + /* + * Initialize the receive transparency options: do we want unknown + * recipient checks, do we want address mapping. + */ + qmqpd_input_transp_mask = + input_transp_mask(VAR_INPUT_TRANSP, var_input_transp); +} + +MAIL_VERSION_STAMP_DECLARE; + +/* main - the main program */ + +int main(int argc, char **argv) +{ + static const CONFIG_TIME_TABLE time_table[] = { + VAR_QMTPD_TMOUT, DEF_QMTPD_TMOUT, &var_qmqpd_timeout, 1, 0, + VAR_QMTPD_ERR_SLEEP, DEF_QMTPD_ERR_SLEEP, &var_qmqpd_err_sleep, 0, 0, + 0, + }; + static const CONFIG_STR_TABLE str_table[] = { + VAR_FILTER_XPORT, DEF_FILTER_XPORT, &var_filter_xport, 0, 0, + VAR_QMQPD_CLIENTS, DEF_QMQPD_CLIENTS, &var_qmqpd_clients, 0, 0, + VAR_INPUT_TRANSP, DEF_INPUT_TRANSP, &var_input_transp, 0, 0, + 0, + }; + static const CONFIG_BOOL_TABLE bool_table[] = { + VAR_QMQPD_CLIENT_PORT_LOG, DEF_QMQPD_CLIENT_PORT_LOG, &var_qmqpd_client_port_log, + 0, + }; + + /* + * Fingerprint executables and core dumps. + */ + MAIL_VERSION_STAMP_ALLOCATE; + + /* + * Pass control to the single-threaded service skeleton. + */ + single_server_main(argc, argv, qmqpd_service, + CA_MAIL_SERVER_TIME_TABLE(time_table), + CA_MAIL_SERVER_STR_TABLE(str_table), + CA_MAIL_SERVER_BOOL_TABLE(bool_table), + CA_MAIL_SERVER_PRE_INIT(pre_jail_init), + CA_MAIL_SERVER_PRE_ACCEPT(pre_accept), + CA_MAIL_SERVER_POST_INIT(post_jail_init), + 0); +} |