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         LIST_INIT(&bounceq.queue);
  56         if (add_recp(&bounceq, it->sender, "", 1) != 0)
  57                 goto fail;
  58
  59         if (newspoolf(&bounceq, "") != 0)
  60                 goto fail;
  61
  62         syslog(LOG_ERR, "delivery failed, bouncing as %s", bounceq.id);
  63         setlogident("%s", bounceq.id);
  64
  65         error = fprintf(bounceq.mailf,
  66                 "Received: from MAILER-DAEMON\n"
  67                 "\tid %s\n"
  68                 "\tby %s (%s)\n"
  69                 "\t%s\n"
  70                 "X-Original-To: <%s>\n"
  71                 "From: MAILER-DAEMON <>\n"
  72                 "To: %s\n"
  73                 "Subject: Mail delivery failed\n"
  74                 "Message-Id: <%s@%s>\n"
  75                 "Date: %s\n"
  76                 "\n"
  77                 "This is the %s at %s.\n"
  78                 "\n"
  79                 "There was an error delivering your mail to <%s>.\n"
  80                 "\n"
  81                 "%s\n"
  82                 "\n"
  83                 "%s\n"
  84                 "\n",
  85                 bounceq.id,
  86                 hostname(), VERSION,
  87                 rfc822date(),
  88                 it->addr,
  89                 it->sender,
  90                 bounceq.id, hostname(),
  91                 rfc822date(),
  92                 VERSION, hostname(),
  93                 it->addr,
  94                 reason,
  95                 config->features & FULLBOUNCE ?
  96                     "Original message follows." :
  97                     "Message headers follow.");
  98         if (error < 0)
  99                 goto fail;
 100
 101         if (fseek(it->mailf, it->hdrlen, SEEK_SET) != 0)
 102                 goto fail;
 103         if (config->features & FULLBOUNCE) {
 104                 while ((pos = fread(line, 1, sizeof(line), it->mailf)) > 0) {
 105                         if (fwrite(line, 1, pos, bounceq.mailf) != pos)
 106                                 goto fail;
 107                 }
 108         } else {
 109                 while (!feof(it->mailf)) {
 110                         if (fgets(line, sizeof(line), it->mailf) == NULL)
 111                                 break;
 112                         if (line[0] == '\n')
 113                                 break;
 114                         if (fwrite(line, strlen(line), 1, bounceq.mailf) != 1)
 115                                 goto fail;
 116                 }
 117         }
 118
 119         if (linkspool(&bounceq, "") != 0)
 120                 goto fail;
 121         /* bounce is safe */
 122
 123         delqueue(it);
 124
 125         run_queue(&bounceq);
 126         /* NOTREACHED */
 127
 128 fail:
 129         syslog(LOG_CRIT, "error creating bounce: %m");
 130         delqueue(it);
 131         exit(1);
 132 }
 133
 134 int
 135 readmail(struct queue *queue, const char *sender, int nodot)
 136 {
 137         char line[1000];        /* by RFC2822 */
 138         size_t linelen;
 139         size_t error;
 140         int had_headers = 0;
 141         int had_from = 0;
 142         int had_messagid = 0;
 143         int had_date = 0;
 144
 145         error = fprintf(queue->mailf,
 146                 "Received: from %s (uid %d)\n"
 147                 "\t(envelope-from %s)\n"
 148                 "\tid %s\n"
 149                 "\tby %s (%s)\n"
 150                 "\t%s\n",
 151                 username, getuid(),
 152                 sender,
 153                 queue->id,
 154                 hostname(), VERSION,
 155                 rfc822date());
 156         if ((ssize_t)error < 0)
 157                 return (-1);
 158
 159         while (!feof(stdin)) {
 160                 if (fgets(line, sizeof(line), stdin) == NULL)
 161                         break;
 162                 linelen = strlen(line);
 163                 if (linelen == 0 || line[linelen - 1] != '\n') {
 164                         errno = EINVAL;         /* XXX mark permanent errors */
 165                         return (-1);
 166                 }
 167                 if (!had_headers) {
 168                         if (strprefixcmp(line, "Date:") == 0)
 169                                 had_date = 1;
 170                         else if (strprefixcmp(line, "Message-Id:") == 0)
 171                                 had_messagid = 1;
 172                         else if (strprefixcmp(line, "From:") == 0)
 173                                 had_from = 1;
 174                 }
 175                 if (strcmp(line, "\n") == 0 && !had_headers) {
 176                         had_headers = 1;
 177                         while (!had_date || !had_messagid || !had_from) {
 178                                 if (!had_date) {
 179                                         had_date = 1;
 180                                         snprintf(line, sizeof(line), "Date: %s\n", rfc822date());
 181                                 } else if (!had_messagid) {
 182                                         /* XXX better msgid, assign earlier and log? */
 183                                         had_messagid = 1;
 184                                         snprintf(line, sizeof(line), "Message-Id: <%s@%s>\n",
 185                                                  queue->id, hostname());
 186                                 } else if (!had_from) {
 187                                         had_from = 1;
 188                                         snprintf(line, sizeof(line), "From: <%s>\n", sender);
 189                                 }
 190                                 if (fwrite(line, strlen(line), 1, queue->mailf) != 1)
 191                                         return (-1);
 192                         }
 193                         strcpy(line, "\n");
 194                 }
 195                 if (!nodot && linelen == 2 && line[0] == '.')
 196                         break;
 197                 if (fwrite(line, strlen(line), 1, queue->mailf) != 1)
 198                         return (-1);
 199         }
 200
 201         return (0);
 202 }