diff options
Diffstat (limited to 'src/global/bounce.c')
| -rw-r--r-- | src/global/bounce.c | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/src/global/bounce.c b/src/global/bounce.c new file mode 100644 index 0000000..072a7a7 --- /dev/null +++ b/src/global/bounce.c @@ -0,0 +1,549 @@ +/*++ +/* NAME +/* bounce 3 +/* SUMMARY +/* bounce service client +/* SYNOPSIS +/* #include <bounce.h> +/* +/* int bounce_append(flags, id, stats, recipient, relay, dsn) +/* int flags; +/* const char *id; +/* MSG_STATS *stats; +/* RECIPIENT *rcpt; +/* const char *relay; +/* DSN *dsn; +/* +/* int bounce_flush(flags, queue, id, encoding, smtputf8, sender, +/* dsn_envid, dsn_ret) +/* int flags; +/* const char *queue; +/* const char *id; +/* const char *encoding; +/* int smtputf8; +/* const char *sender; +/* const char *dsn_envid; +/* int dsn_ret; +/* +/* int bounce_flush_verp(flags, queue, id, encoding, smtputf8, +/* sender, dsn_envid, dsn_ret, verp_delims) +/* int flags; +/* const char *queue; +/* const char *id; +/* const char *encoding; +/* int smtputf8; +/* const char *sender; +/* const char *dsn_envid; +/* int dsn_ret; +/* const char *verp_delims; +/* +/* int bounce_one(flags, queue, id, encoding, smtputf8, sender, +/* dsn_envid, ret, stats, recipient, relay, dsn) +/* int flags; +/* const char *queue; +/* const char *id; +/* const char *encoding; +/* int smtputf8; +/* const char *sender; +/* const char *dsn_envid; +/* int dsn_ret; +/* MSG_STATS *stats; +/* RECIPIENT *rcpt; +/* const char *relay; +/* DSN *dsn; +/* +/* void bounce_client_init(title, maps) +/* const char *title; +/* const char *maps; +/* INTERNAL API +/* DSN_FILTER *delivery_status_filter; +/* +/* int bounce_append_intern(flags, id, stats, recipient, relay, dsn) +/* int flags; +/* const char *id; +/* MSG_STATS *stats; +/* RECIPIENT *rcpt; +/* const char *relay; +/* +/* int bounce_one_intern(flags, queue, id, encoding, smtputf8, sender, +/* dsn_envid, ret, stats, recipient, relay, dsn) +/* int flags; +/* const char *queue; +/* const char *id; +/* const char *encoding; +/* int smtputf8; +/* const char *sender; +/* const char *dsn_envid; +/* int dsn_ret; +/* MSG_STATS *stats; +/* RECIPIENT *rcpt; +/* const char *relay; +/* DSN *dsn; +/* DESCRIPTION +/* This module implements the client interface to the message +/* bounce service, which maintains a per-message log of status +/* records with recipients that were bounced, and the dsn_text why. +/* +/* bounce_append() appends a dsn_text for non-delivery to the +/* bounce log for the named recipient, updates the address +/* verification service, or updates a message delivery record +/* on request by the sender. The flags argument determines +/* the action. +/* +/* bounce_flush() actually bounces the specified message to +/* the specified sender, including the bounce log that was +/* built with bounce_append(). The bounce logfile is removed +/* upon successful completion. +/* +/* bounce_flush_verp() is like bounce_flush(), but sends one +/* notification per recipient, with the failed recipient encoded +/* into the sender address. +/* +/* bounce_one() bounces one recipient and immediately sends a +/* notification to the sender. This procedure does not append +/* the recipient and dsn_text to the per-message bounce log, and +/* should be used when a delivery agent changes the error +/* return address in a manner that depends on the recipient +/* address. +/* +/* bounce_client_init() initializes an optional DSN filter. +/* +/* bounce_append_intern() and bounce_one_intern() are for use +/* after the DSN filter. +/* +/* Arguments: +/* .IP flags +/* The bitwise OR of zero or more of the following (specify +/* BOUNCE_FLAG_NONE to request no special processing): +/* .RS +/* .IP BOUNCE_FLAG_CLEAN +/* Delete the bounce log in case of an error (as in: pretend +/* that we never even tried to bounce this message). +/* .IP BOUNCE_FLAG_DELRCPT +/* When specified with a flush request, request that +/* recipients be deleted from the queue file. +/* +/* Note: the bounce daemon ignores this request when the +/* recipient queue file offset is <= 0. +/* .IP DEL_REQ_FLAG_MTA_VRFY +/* The message is an MTA-requested address verification probe. +/* Update the address verification database instead of bouncing +/* mail. +/* .IP DEL_REQ_FLAG_USR_VRFY +/* The message is a user-requested address expansion probe. +/* Update the message delivery record instead of bouncing mail. +/* .IP DEL_REQ_FLAG_RECORD +/* This is a normal message with logged delivery. Update the +/* message delivery record and bounce the mail. +/* .RE +/* .IP queue +/* The message queue name of the original message file. +/* .IP id +/* The message queue id if the original message file. The bounce log +/* file has the same name as the original message file. +/* .IP stats +/* Time stamps from different message delivery stages +/* and session reuse count. +/* .IP rcpt +/* Recipient information. See recipient_list(3). +/* .IP relay +/* Name of the host that the message could not be delivered to. +/* This information is used for syslogging only. +/* .IP encoding +/* The body content encoding: MAIL_ATTR_ENC_{7BIT,8BIT,NONE}. +/* .IP smtputf8 +/* The level of SMTPUTF8 support (to be defined). +/* .IP sender +/* The sender envelope address. +/* .IP dsn_envid +/* Optional DSN envelope ID. +/* .IP dsn_ret +/* Optional DSN return full/headers option. +/* .IP dsn +/* Delivery status. See dsn(3). The specified action is ignored. +/* .IP verp_delims +/* VERP delimiter characters, used when encoding the failed +/* sender into the envelope sender address. +/* DIAGNOSTICS +/* In case of success, these functions log the action, and return a +/* zero value. Otherwise, the functions return a non-zero result, +/* and when BOUNCE_FLAG_CLEAN is disabled, log that message +/* delivery is deferred. +/* .IP title +/* The origin of the optional DSN filter lookup table names. +/* .IP maps +/* The optional "type:table" DSN filter lookup table names, +/* separated by comma or whitespace. +/* BUGS +/* Should be replaced by routines with an attribute-value based +/* interface instead of an interface that uses a rigid argument list. +/* 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> + +/* Utility library. */ + +#include <msg.h> +#include <vstring.h> +#include <mymalloc.h> + +/* Global library. */ + +#define DSN_INTERN +#include <mail_params.h> +#include <mail_proto.h> +#include <log_adhoc.h> +#include <dsn_util.h> +#include <rcpt_print.h> +#include <dsn_print.h> +#include <verify.h> +#include <defer.h> +#include <trace.h> +#include <bounce.h> + +/* Shared internally, between bounce and defer clients. */ + +DSN_FILTER *delivery_status_filter; + +/* bounce_append - append delivery status to per-message bounce log */ + +int bounce_append(int flags, const char *id, MSG_STATS *stats, + RECIPIENT *rcpt, const char *relay, + DSN *dsn) +{ + DSN my_dsn = *dsn; + DSN *dsn_res; + + /* + * Sanity check. If we're really confident, change this into msg_panic + * (remember, this information may be under control by a hostile server). + */ + if (my_dsn.status[0] != '5' || !dsn_valid(my_dsn.status)) { + msg_warn("bounce_append: ignoring dsn code \"%s\"", my_dsn.status); + my_dsn.status = "5.0.0"; + } + + /* + * DSN filter (Postfix 3.0). + */ + if (delivery_status_filter != 0 + && (dsn_res = dsn_filter_lookup(delivery_status_filter, &my_dsn)) != 0) { + if (dsn_res->status[0] == '4') + return (defer_append_intern(flags, id, stats, rcpt, relay, dsn_res)); + my_dsn = *dsn_res; + } + return (bounce_append_intern(flags, id, stats, rcpt, relay, &my_dsn)); +} + +/* bounce_append_intern - append delivery status to per-message bounce log */ + +int bounce_append_intern(int flags, const char *id, MSG_STATS *stats, + RECIPIENT *rcpt, const char *relay, + DSN *dsn) +{ + DSN my_dsn = *dsn; + int status; + + /* + * MTA-requested address verification information is stored in the verify + * service database. + */ + if (flags & DEL_REQ_FLAG_MTA_VRFY) { + my_dsn.action = "undeliverable"; + status = verify_append(id, stats, rcpt, relay, &my_dsn, + DEL_RCPT_STAT_BOUNCE); + return (status); + } + + /* + * User-requested address verification information is logged and mailed + * to the requesting user. + */ + if (flags & DEL_REQ_FLAG_USR_VRFY) { + my_dsn.action = "undeliverable"; + status = trace_append(flags, id, stats, rcpt, relay, &my_dsn); + return (status); + } + + /* + * Normal (well almost) delivery. When we're pretending that we can't + * bounce, don't create a defer log file when we wouldn't keep the bounce + * log file. That's a lot of negatives in one sentence. + */ + else if (var_soft_bounce && (flags & BOUNCE_FLAG_CLEAN)) { + return (-1); + } + + /* + * Normal mail delivery. May also send a delivery record to the user. + * + * XXX DSN We write all recipients to the bounce logfile regardless of DSN + * NOTIFY options, because those options don't apply to postmaster + * notifications. + */ + else { + char *my_status = mystrdup(my_dsn.status); + const char *log_status = var_soft_bounce ? "SOFTBOUNCE" : "bounced"; + + /* + * Supply default action. + */ + my_dsn.status = my_status; + if (var_soft_bounce) { + my_status[0] = '4'; + my_dsn.action = "delayed"; + } else { + my_dsn.action = "failed"; + } + + if (mail_command_client(MAIL_CLASS_PRIVATE, var_soft_bounce ? + var_defer_service : var_bounce_service, + MAIL_ATTR_PROTO_BOUNCE, + SEND_ATTR_INT(MAIL_ATTR_NREQ, BOUNCE_CMD_APPEND), + SEND_ATTR_INT(MAIL_ATTR_FLAGS, flags), + SEND_ATTR_STR(MAIL_ATTR_QUEUEID, id), + SEND_ATTR_FUNC(rcpt_print, (const void *) rcpt), + SEND_ATTR_FUNC(dsn_print, (const void *) &my_dsn), + ATTR_TYPE_END) == 0 + && ((flags & DEL_REQ_FLAG_RECORD) == 0 + || trace_append(flags, id, stats, rcpt, relay, + &my_dsn) == 0)) { + log_adhoc(id, stats, rcpt, relay, &my_dsn, log_status); + status = (var_soft_bounce ? -1 : 0); + } else if ((flags & BOUNCE_FLAG_CLEAN) == 0) { + VSTRING *junk = vstring_alloc(100); + + my_dsn.status = "4.3.0"; + vstring_sprintf(junk, "%s or %s service failure", + var_bounce_service, var_trace_service); + my_dsn.reason = vstring_str(junk); + status = defer_append_intern(flags, id, stats, rcpt, relay, &my_dsn); + vstring_free(junk); + } else { + status = -1; + } + myfree(my_status); + return (status); + } +} + +/* bounce_flush - flush the bounce log and deliver to the sender */ + +int bounce_flush(int flags, const char *queue, const char *id, + const char *encoding, int smtputf8, + const char *sender, const char *dsn_envid, + int dsn_ret) +{ + + /* + * When we're pretending that we can't bounce, don't send a bounce + * message. + */ + if (var_soft_bounce) + return (-1); + if (mail_command_client(MAIL_CLASS_PRIVATE, var_bounce_service, + MAIL_ATTR_PROTO_BOUNCE, + SEND_ATTR_INT(MAIL_ATTR_NREQ, BOUNCE_CMD_FLUSH), + SEND_ATTR_INT(MAIL_ATTR_FLAGS, flags), + SEND_ATTR_STR(MAIL_ATTR_QUEUE, queue), + SEND_ATTR_STR(MAIL_ATTR_QUEUEID, id), + SEND_ATTR_STR(MAIL_ATTR_ENCODING, encoding), + SEND_ATTR_INT(MAIL_ATTR_SMTPUTF8, smtputf8), + SEND_ATTR_STR(MAIL_ATTR_SENDER, sender), + SEND_ATTR_STR(MAIL_ATTR_DSN_ENVID, dsn_envid), + SEND_ATTR_INT(MAIL_ATTR_DSN_RET, dsn_ret), + ATTR_TYPE_END) == 0) { + return (0); + } else if ((flags & BOUNCE_FLAG_CLEAN) == 0) { + msg_info("%s: status=deferred (bounce failed)", id); + return (-1); + } else { + return (-1); + } +} + +/* bounce_flush_verp - verpified notification */ + +int bounce_flush_verp(int flags, const char *queue, const char *id, + const char *encoding, int smtputf8, + const char *sender, const char *dsn_envid, + int dsn_ret, const char *verp_delims) +{ + + /* + * When we're pretending that we can't bounce, don't send a bounce + * message. + */ + if (var_soft_bounce) + return (-1); + if (mail_command_client(MAIL_CLASS_PRIVATE, var_bounce_service, + MAIL_ATTR_PROTO_BOUNCE, + SEND_ATTR_INT(MAIL_ATTR_NREQ, BOUNCE_CMD_VERP), + SEND_ATTR_INT(MAIL_ATTR_FLAGS, flags), + SEND_ATTR_STR(MAIL_ATTR_QUEUE, queue), + SEND_ATTR_STR(MAIL_ATTR_QUEUEID, id), + SEND_ATTR_STR(MAIL_ATTR_ENCODING, encoding), + SEND_ATTR_INT(MAIL_ATTR_SMTPUTF8, smtputf8), + SEND_ATTR_STR(MAIL_ATTR_SENDER, sender), + SEND_ATTR_STR(MAIL_ATTR_DSN_ENVID, dsn_envid), + SEND_ATTR_INT(MAIL_ATTR_DSN_RET, dsn_ret), + SEND_ATTR_STR(MAIL_ATTR_VERPDL, verp_delims), + ATTR_TYPE_END) == 0) { + return (0); + } else if ((flags & BOUNCE_FLAG_CLEAN) == 0) { + msg_info("%s: status=deferred (bounce failed)", id); + return (-1); + } else { + return (-1); + } +} + +/* bounce_one - send notice for one recipient */ + +int bounce_one(int flags, const char *queue, const char *id, + const char *encoding, int smtputf8, + const char *sender, const char *dsn_envid, + int dsn_ret, MSG_STATS *stats, RECIPIENT *rcpt, + const char *relay, DSN *dsn) +{ + DSN my_dsn = *dsn; + DSN *dsn_res; + + /* + * Sanity check. + */ + if (my_dsn.status[0] != '5' || !dsn_valid(my_dsn.status)) { + msg_warn("bounce_one: ignoring dsn code \"%s\"", my_dsn.status); + my_dsn.status = "5.0.0"; + } + + /* + * DSN filter (Postfix 3.0). + */ + if (delivery_status_filter != 0 + && (dsn_res = dsn_filter_lookup(delivery_status_filter, &my_dsn)) != 0) { + if (dsn_res->status[0] == '4') + return (defer_append_intern(flags, id, stats, rcpt, relay, dsn_res)); + my_dsn = *dsn_res; + } + return (bounce_one_intern(flags, queue, id, encoding, smtputf8, sender, + dsn_envid, dsn_ret, stats, rcpt, relay, &my_dsn)); +} + +/* bounce_one_intern - send notice for one recipient */ + +int bounce_one_intern(int flags, const char *queue, const char *id, + const char *encoding, int smtputf8, + const char *sender, const char *dsn_envid, + int dsn_ret, MSG_STATS *stats, + RECIPIENT *rcpt, const char *relay, + DSN *dsn) +{ + DSN my_dsn = *dsn; + int status; + + /* + * MTA-requested address verification information is stored in the verify + * service database. + */ + if (flags & DEL_REQ_FLAG_MTA_VRFY) { + my_dsn.action = "undeliverable"; + status = verify_append(id, stats, rcpt, relay, &my_dsn, + DEL_RCPT_STAT_BOUNCE); + return (status); + } + + /* + * User-requested address verification information is logged and mailed + * to the requesting user. + */ + if (flags & DEL_REQ_FLAG_USR_VRFY) { + my_dsn.action = "undeliverable"; + status = trace_append(flags, id, stats, rcpt, relay, &my_dsn); + return (status); + } + + /* + * When we're not bouncing, then use the standard multi-recipient logfile + * based procedure. + */ + else if (var_soft_bounce) { + return (bounce_append_intern(flags, id, stats, rcpt, relay, &my_dsn)); + } + + /* + * Normal mail delivery. May also send a delivery record to the user. + * + * XXX DSN We send all recipients regardless of DSN NOTIFY options, because + * those options don't apply to postmaster notifications. + */ + else { + + /* + * Supply default action. + */ + my_dsn.action = "failed"; + + if (mail_command_client(MAIL_CLASS_PRIVATE, var_bounce_service, + MAIL_ATTR_PROTO_BOUNCE, + SEND_ATTR_INT(MAIL_ATTR_NREQ, BOUNCE_CMD_ONE), + SEND_ATTR_INT(MAIL_ATTR_FLAGS, flags), + SEND_ATTR_STR(MAIL_ATTR_QUEUE, queue), + SEND_ATTR_STR(MAIL_ATTR_QUEUEID, id), + SEND_ATTR_STR(MAIL_ATTR_ENCODING, encoding), + SEND_ATTR_INT(MAIL_ATTR_SMTPUTF8, smtputf8), + SEND_ATTR_STR(MAIL_ATTR_SENDER, sender), + SEND_ATTR_STR(MAIL_ATTR_DSN_ENVID, dsn_envid), + SEND_ATTR_INT(MAIL_ATTR_DSN_RET, dsn_ret), + SEND_ATTR_FUNC(rcpt_print, (const void *) rcpt), + SEND_ATTR_FUNC(dsn_print, (const void *) &my_dsn), + ATTR_TYPE_END) == 0 + && ((flags & DEL_REQ_FLAG_RECORD) == 0 + || trace_append(flags, id, stats, rcpt, relay, + &my_dsn) == 0)) { + log_adhoc(id, stats, rcpt, relay, &my_dsn, "bounced"); + status = 0; + } else if ((flags & BOUNCE_FLAG_CLEAN) == 0) { + VSTRING *junk = vstring_alloc(100); + + my_dsn.status = "4.3.0"; + vstring_sprintf(junk, "%s or %s service failure", + var_bounce_service, var_trace_service); + my_dsn.reason = vstring_str(junk); + status = defer_append_intern(flags, id, stats, rcpt, relay, &my_dsn); + vstring_free(junk); + } else { + status = -1; + } + return (status); + } +} + +/* bounce_client_init - initialize bounce/defer DSN filter */ + +void bounce_client_init(const char *title, const char *maps) +{ + static const char myname[] = "bounce_client_init"; + + if (delivery_status_filter != 0) + msg_panic("%s: duplicate initialization", myname); + if (*maps) + delivery_status_filter = dsn_filter_create(title, maps); +} |