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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:59:03 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:59:03 +0000 |
commit | a848231ae0f346dc7cc000973fbeb65b0894ee92 (patch) | |
tree | 44b60b367c86723cc78383ef247885d72b388afe /src/global/bounce_log.c | |
parent | Initial commit. (diff) | |
download | postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.tar.xz postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.zip |
Adding upstream version 3.8.5.upstream/3.8.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/global/bounce_log.c')
-rw-r--r-- | src/global/bounce_log.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/src/global/bounce_log.c b/src/global/bounce_log.c new file mode 100644 index 0000000..b97515e --- /dev/null +++ b/src/global/bounce_log.c @@ -0,0 +1,321 @@ +/*++ +/* NAME +/* bounce_log 3 +/* SUMMARY +/* bounce file API +/* SYNOPSIS +/* #include <bounce_log.h> +/* +/* typedef struct { +/* .in +4 +/* /* No public members. */ +/* .in -4 +/* } BOUNCE_LOG; +/* +/* BOUNCE_LOG *bounce_log_open(queue, id, flags, mode) +/* const char *queue; +/* const char *id; +/* int flags; +/* mode_t mode; +/* +/* BOUNCE_LOG *bounce_log_read(bp, rcpt, dsn) +/* BOUNCE_LOG *bp; +/* RCPT_BUF *rcpt; +/* DSN_BUF *dsn; +/* +/* void bounce_log_rewind(bp) +/* BOUNCE_LOG *bp; +/* +/* void bounce_log_close(bp) +/* BOUNCE_LOG *bp; +/* DESCRIPTION +/* This module implements a bounce/defer logfile API. Information +/* is sanitized for control and non-ASCII characters. Fields not +/* present in input are represented by empty strings. +/* +/* bounce_log_open() opens the named bounce or defer logfile +/* and returns a handle that must be used for further access. +/* The result is a null pointer if the file cannot be opened. +/* The caller is expected to inspect the errno code and deal +/* with the problem. +/* +/* bounce_log_read() reads the next record from the bounce or defer +/* logfile (skipping over and warning about malformed data) +/* and breaks out the recipient address, the recipient status +/* and the text that explains why the recipient was undeliverable. +/* bounce_log_read() returns a null pointer when no recipient was read, +/* otherwise it returns its argument. +/* +/* bounce_log_rewind() is a helper that seeks to the first recipient +/* in an open bounce or defer logfile (skipping over recipients that +/* are marked as done). The result is 0 in case of success, -1 in case +/* of problems. +/* +/* bounce_log_close() closes an open bounce or defer logfile and +/* releases memory for the specified handle. The result is non-zero +/* in case of I/O errors. +/* +/* Arguments: +/* .IP queue +/* The bounce or defer queue name. +/* .IP id +/* The message queue id of bounce or defer logfile. This +/* file has the same name as the original message file. +/* .IP flags +/* File open flags, as with open(2). +/* .IP mode +/* File permissions, as with open(2). +/* .IP rcpt +/* Recipient buffer. The RECIPIENT member is updated. +/* .IP dsn +/* Delivery status information. The DSN member is updated. +/* 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 <string.h> +#include <ctype.h> +#include <unistd.h> +#include <stdlib.h> + +/* Utility library. */ + +#include <msg.h> +#include <mymalloc.h> +#include <vstream.h> +#include <vstring.h> +#include <vstring_vstream.h> +#include <stringops.h> + +/* Global library. */ + +#include <mail_params.h> +#include <mail_proto.h> +#include <mail_queue.h> +#include <dsn_mask.h> +#include <bounce_log.h> + +/* Application-specific. */ + +#define STR(x) vstring_str(x) + +/* bounce_log_open - open bounce read stream */ + +BOUNCE_LOG *bounce_log_open(const char *queue_name, const char *queue_id, + int flags, mode_t mode) +{ + BOUNCE_LOG *bp; + VSTREAM *fp; + +#define STREQ(x,y) (strcmp((x),(y)) == 0) + + /* + * Logfiles may contain a mixture of old-style (<recipient>: text) and + * new-style entries with multiple attributes per recipient. + * + * Kluge up default DSN status and action for old-style logfiles. + */ + if ((fp = mail_queue_open(queue_name, queue_id, flags, mode)) == 0) { + return (0); + } else { + bp = (BOUNCE_LOG *) mymalloc(sizeof(*bp)); + bp->fp = fp; + bp->buf = vstring_alloc(100); + if (STREQ(queue_name, MAIL_QUEUE_DEFER)) { + bp->compat_status = mystrdup("4.0.0"); + bp->compat_action = mystrdup("delayed"); + } else { + bp->compat_status = mystrdup("5.0.0"); + bp->compat_action = mystrdup("failed"); + } + return (bp); + } +} + +/* bounce_log_read - read one record from bounce log file */ + +BOUNCE_LOG *bounce_log_read(BOUNCE_LOG *bp, RCPT_BUF *rcpt_buf, + DSN_BUF *dsn_buf) +{ + char *recipient; + char *text; + char *cp; + int state; + + /* + * Our trivial logfile parser state machine. + */ +#define START 0 /* still searching */ +#define FOUND 1 /* in logfile entry */ + + /* + * Initialize. + */ + state = START; + rcpb_reset(rcpt_buf); + dsb_reset(dsn_buf); + + /* + * Support mixed logfile formats to make migration easier. The same file + * can start with old-style records and end with new-style records. With + * backwards compatibility, we even have old format followed by new + * format within the same logfile entry! + */ + for (;;) { + if ((vstring_get_nonl(bp->buf, bp->fp) == VSTREAM_EOF)) + return (0); + + /* + * Logfile entries are separated by blank lines. Even the old ad-hoc + * logfile format has a blank line after the last record. This means + * we can safely use blank lines to detect the start and end of + * logfile entries. + */ + if (STR(bp->buf)[0] == 0) { + if (state == FOUND) + break; + state = START; + continue; + } + + /* + * Sanitize. XXX This needs to be done more carefully with new-style + * logfile entries. + */ + cp = printable(STR(bp->buf), '?'); + + if (state == START) + state = FOUND; + + /* + * New style logfile entries are in "name = value" format. + */ + if (ISALNUM(*cp)) { + const char *err; + char *name; + char *value; + long offset; + int notify; + + /* + * Split into name and value. + */ + if ((err = split_nameval(cp, &name, &value)) != 0) { + msg_warn("%s: malformed record: %s", VSTREAM_PATH(bp->fp), err); + continue; + } + + /* + * Save attribute value. + */ + if (STREQ(name, MAIL_ATTR_RECIP)) { + vstring_strcpy(rcpt_buf->address, *value ? + value : "(MAILER-DAEMON)"); + } else if (STREQ(name, MAIL_ATTR_ORCPT)) { + vstring_strcpy(rcpt_buf->orig_addr, *value ? + value : "(MAILER-DAEMON)"); + } else if (STREQ(name, MAIL_ATTR_DSN_ORCPT)) { + vstring_strcpy(rcpt_buf->dsn_orcpt, value); + } else if (STREQ(name, MAIL_ATTR_DSN_NOTIFY)) { + if ((notify = atoi(value)) > 0 && DSN_NOTIFY_OK(notify)) + rcpt_buf->dsn_notify = notify; + } else if (STREQ(name, MAIL_ATTR_OFFSET)) { + if ((offset = atol(value)) > 0) + rcpt_buf->offset = offset; + } else if (STREQ(name, MAIL_ATTR_DSN_STATUS)) { + vstring_strcpy(dsn_buf->status, value); + } else if (STREQ(name, MAIL_ATTR_DSN_ACTION)) { + vstring_strcpy(dsn_buf->action, value); + } else if (STREQ(name, MAIL_ATTR_DSN_DTYPE)) { + vstring_strcpy(dsn_buf->dtype, value); + } else if (STREQ(name, MAIL_ATTR_DSN_DTEXT)) { + vstring_strcpy(dsn_buf->dtext, value); + } else if (STREQ(name, MAIL_ATTR_DSN_MTYPE)) { + vstring_strcpy(dsn_buf->mtype, value); + } else if (STREQ(name, MAIL_ATTR_DSN_MNAME)) { + vstring_strcpy(dsn_buf->mname, value); + } else if (STREQ(name, MAIL_ATTR_WHY)) { + vstring_strcpy(dsn_buf->reason, value); + } else { + msg_warn("%s: unknown attribute name: %s, ignored", + VSTREAM_PATH(bp->fp), name); + } + continue; + } + + /* + * Old-style logfile record. Find the recipient address. + */ + if (*cp != '<') { + msg_warn("%s: malformed record: %.30s...", + VSTREAM_PATH(bp->fp), cp); + continue; + } + recipient = cp + 1; + if ((cp = strstr(recipient, ">: ")) == 0) { + msg_warn("%s: malformed record: %.30s...", + VSTREAM_PATH(bp->fp), recipient - 1); + continue; + } + *cp = 0; + vstring_strcpy(rcpt_buf->address, *recipient ? + recipient : "(MAILER-DAEMON)"); + + /* + * Find the text that explains why mail was not deliverable. + */ + text = cp + 2; + while (*text && ISSPACE(*text)) + text++; + vstring_strcpy(dsn_buf->reason, text); + } + + /* + * Specify place holders for missing fields. See also DSN_FROM_DSN_BUF() + * and RECIPIENT_FROM_RCPT_BUF() for null and non-null fields. + */ +#define BUF_NODATA(buf) (STR(buf)[0] == 0) +#define BUF_ASSIGN(buf, text) vstring_strcpy((buf), (text)) + + if (BUF_NODATA(rcpt_buf->address)) + BUF_ASSIGN(rcpt_buf->address, "(recipient address unavailable)"); + if (BUF_NODATA(dsn_buf->status)) + BUF_ASSIGN(dsn_buf->status, bp->compat_status); + if (BUF_NODATA(dsn_buf->action)) + BUF_ASSIGN(dsn_buf->action, bp->compat_action); + if (BUF_NODATA(dsn_buf->reason)) + BUF_ASSIGN(dsn_buf->reason, "(description unavailable)"); + (void) RECIPIENT_FROM_RCPT_BUF(rcpt_buf); + (void) DSN_FROM_DSN_BUF(dsn_buf); + return (bp); +} + +/* bounce_log_close - close bounce reader stream */ + +int bounce_log_close(BOUNCE_LOG *bp) +{ + int ret; + + ret = vstream_fclose(bp->fp); + vstring_free(bp->buf); + myfree(bp->compat_status); + myfree(bp->compat_action); + myfree((void *) bp); + + return (ret); +} |