libexec/dma/mail.c

   1 /*
   2  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Simon 'corecode' Schubert <corecode@fs.ei.tum.de>.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <errno.h>
  36 #include <syslog.h>
  37 #include <unistd.h>
  38
  39 #include "dma.h"
  40
  41 void
  42 bounce(struct qitem *it, const char *reason)
  43 {
  44         struct queue bounceq;
  45         char line[1000];
  46         size_t pos;
  47         int error;
  48
  49         /* Don't bounce bounced mails */
  50         if (it->sender[0] == 0) {
  51                 syslog(LOG_INFO, "can not bounce a bounce message, discarding");
  52                 exit(1);
  53         }
  54
  55         bzero(&bounceq, sizeof(bounceq));
  56         LIST_INIT(&bounceq.queue);
  57         bounceq.sender = "";
  58         if (add_recp(&bounceq, it->sender, 1) != 0)
  59                 goto fail;
  60
  61         if (newspoolf(&bounceq) != 0)
  62                 goto fail;
  63
  64         syslog(LOG_ERR, "delivery failed, bouncing as %s", bounceq.id);
  65         setlogident("%s", bounceq.id);
  66
  67         error = fprintf(bounceq.mailf,
  68                 "Received: from MAILER-DAEMON\n"
  69                 "\tid %s\n"
  70                 "\tby %s (%s)\n"
  71                 "\t%s\n"
  72                 "X-Original-To: <%s>\n"
  73                 "From: MAILER-DAEMON <>\n"
  74                 "To: %s\n"
  75                 "Subject: Mail delivery failed\n"
  76                 "Message-Id: <%s@%s>\n"
  77                 "Date: %s\n"
  78                 "\n"
  79                 "This is the %s at %s.\n"
  80                 "\n"
  81                 "There was an error delivering your mail to <%s>.\n"
  82                 "\n"
  83                 "%s\n"
  84                 "\n"
  85                 "%s\n"
  86                 "\n",
  87                 bounceq.id,
  88                 hostname(), VERSION,
  89                 rfc822date(),
  90                 it->addr,
  91                 it->sender,
  92                 bounceq.id, hostname(),
  93                 rfc822date(),
  94                 VERSION, hostname(),
  95                 it->addr,
  96                 reason,
  97                 config->features & FULLBOUNCE ?
  98                     "Original message follows." :
  99                     "Message headers follow.");
 100         if (error < 0)
 101                 goto fail;
 102
 103         if (fseek(it->mailf, it->hdrlen, SEEK_SET) != 0)
 104                 goto fail;
 105         if (config->features & FULLBOUNCE) {
 106                 while ((pos = fread(line, 1, sizeof(line), it->mailf)) > 0) {
 107                         if (fwrite(line, 1, pos, bounceq.mailf) != pos)
 108                                 goto fail;
 109                 }
 110         } else {
 111                 while (!feof(it->mailf)) {
 112                         if (fgets(line, sizeof(line), it->mailf) == NULL)
 113                                 break;
 114                         if (line[0] == '\n')
 115                                 break;
 116                         if (fwrite(line, strlen(line), 1, bounceq.mailf) != 1)
 117                                 goto fail;
 118                 }
 119         }
 120
 121         if (linkspool(&bounceq) != 0)
 122                 goto fail;
 123         /* bounce is safe */
 124
 125         delqueue(it);
 126
 127         run_queue(&bounceq);
 128         /* NOTREACHED */
 129
 130 fail:
 131         syslog(LOG_CRIT, "error creating bounce: %m");
 132         delqueue(it);
 133         exit(1);
 134 }
 135
 136 int
 137 readmail(struct queue *queue, int nodot)
 138 {
 139         char line[1000];        /* by RFC2822 */
 140         size_t linelen;
 141         size_t error;
 142         int had_headers = 0;
 143         int had_from = 0;
 144         int had_messagid = 0;
 145         int had_date = 0;
 146
 147         error = fprintf(queue->mailf,
 148                 "Received: from %s (uid %d)\n"
 149                 "\t(envelope-from %s)\n"
 150                 "\tid %s\n"
 151                 "\tby %s (%s)\n"
 152                 "\t%s\n",
 153                 username, getuid(),
 154                 queue->sender,
 155                 queue->id,
 156                 hostname(), VERSION,
 157                 rfc822date());
 158         if ((ssize_t)error < 0)
 159                 return (-1);
 160
 161         while (!feof(stdin)) {
 162                 if (fgets(line, sizeof(line), stdin) == NULL)
 163                         break;
 164                 linelen = strlen(line);
 165                 if (linelen == 0 || line[linelen - 1] != '\n') {
 166                         errno = EINVAL;         /* XXX mark permanent errors */
 167                         return (-1);
 168                 }
 169                 if (!had_headers) {
 170                         if (strprefixcmp(line, "Date:") == 0)
 171                                 had_date = 1;
 172                         else if (strprefixcmp(line, "Message-Id:") == 0)
 173                                 had_messagid = 1;
 174                         else if (strprefixcmp(line, "From:") == 0)
 175                                 had_from = 1;
 176                 }
 177                 if (strcmp(line, "\n") == 0 && !had_headers) {
 178                         had_headers = 1;
 179                         while (!had_date || !had_messagid || !had_from) {
 180                                 if (!had_date) {
 181                                         had_date = 1;
 182                                         snprintf(line, sizeof(line), "Date: %s\n", rfc822date());
 183                                 } else if (!had_messagid) {
 184                                         /* XXX better msgid, assign earlier and log? */
 185                                         had_messagid = 1;
 186                                         snprintf(line, sizeof(line), "Message-Id: <%s@%s>\n",
 187                                                  queue->id, hostname());
 188                                 } else if (!had_from) {
 189                                         had_from = 1;
 190                                         snprintf(line, sizeof(line), "From: <%s>\n", queue->sender);
 191                                 }
 192                                 if (fwrite(line, strlen(line), 1, queue->mailf) != 1)
 193                                         return (-1);
 194                         }
 195                         strcpy(line, "\n");
 196                 }
 197                 if (!nodot && linelen == 2 && line[0] == '.')
 198                         break;
 199                 if (fwrite(line, strlen(line), 1, queue->mailf) != 1)
 200                         return (-1);
 201         }
 202
 203         return (0);
 204 }