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         if (add_recp(&bounceq, it->sender, "", 1) != 0)
  58                 goto fail;
  59
  60         if (newspoolf(&bounceq, "") != 0)
  61                 goto fail;
  62
  63         syslog(LOG_ERR, "delivery failed, bouncing as %s", bounceq.id);
  64         setlogident("%s", bounceq.id);
  65
  66         error = fprintf(bounceq.mailf,
  67                 "Received: from MAILER-DAEMON\n"
  68                 "\tid %s\n"
  69                 "\tby %s (%s)\n"
  70                 "\t%s\n"
  71                 "X-Original-To: <%s>\n"
  72                 "From: MAILER-DAEMON <>\n"
  73                 "To: %s\n"
  74                 "Subject: Mail delivery failed\n"
  75                 "Message-Id: <%s@%s>\n"
  76                 "Date: %s\n"
  77                 "\n"
  78                 "This is the %s at %s.\n"
  79                 "\n"
  80                 "There was an error delivering your mail to <%s>.\n"
  81                 "\n"
  82                 "%s\n"
  83                 "\n"
  84                 "%s\n"
  85                 "\n",
  86                 bounceq.id,
  87                 hostname(), VERSION,
  88                 rfc822date(),
  89                 it->addr,
  90                 it->sender,
  91                 bounceq.id, hostname(),
  92                 rfc822date(),
  93                 VERSION, hostname(),
  94                 it->addr,
  95                 reason,
  96                 config->features & FULLBOUNCE ?
  97                     "Original message follows." :
  98                     "Message headers follow.");
  99         if (error < 0)
 100                 goto fail;
 101
 102         if (fseek(it->mailf, it->hdrlen, SEEK_SET) != 0)
 103                 goto fail;
 104         if (config->features & FULLBOUNCE) {
 105                 while ((pos = fread(line, 1, sizeof(line), it->mailf)) > 0) {
 106                         if (fwrite(line, 1, pos, bounceq.mailf) != pos)
 107                                 goto fail;
 108                 }
 109         } else {
 110                 while (!feof(it->mailf)) {
 111                         if (fgets(line, sizeof(line), it->mailf) == NULL)
 112                                 break;
 113                         if (line[0] == '\n')
 114                                 break;
 115                         if (fwrite(line, strlen(line), 1, bounceq.mailf) != 1)
 116                                 goto fail;
 117                 }
 118         }
 119
 120         if (linkspool(&bounceq, "") != 0)
 121                 goto fail;
 122         /* bounce is safe */
 123
 124         delqueue(it);
 125
 126         run_queue(&bounceq);
 127         /* NOTREACHED */
 128
 129 fail:
 130         syslog(LOG_CRIT, "error creating bounce: %m");
 131         delqueue(it);
 132         exit(1);
 133 }
 134
 135 int
 136 readmail(struct queue *queue, const char *sender, int nodot)
 137 {
 138         char line[1000];        /* by RFC2822 */
 139         size_t linelen;
 140         size_t error;
 141         int had_headers = 0;
 142         int had_from = 0;
 143         int had_messagid = 0;
 144         int had_date = 0;
 145
 146         error = fprintf(queue->mailf,
 147                 "Received: from %s (uid %d)\n"
 148                 "\t(envelope-from %s)\n"
 149                 "\tid %s\n"
 150                 "\tby %s (%s)\n"
 151                 "\t%s\n",
 152                 username, getuid(),
 153                 sender,
 154                 queue->id,
 155                 hostname(), VERSION,
 156                 rfc822date());
 157         if ((ssize_t)error < 0)
 158                 return (-1);
 159
 160         while (!feof(stdin)) {
 161                 if (fgets(line, sizeof(line), stdin) == NULL)
 162                         break;
 163                 linelen = strlen(line);
 164                 if (linelen == 0 || line[linelen - 1] != '\n') {
 165                         errno = EINVAL;         /* XXX mark permanent errors */
 166                         return (-1);
 167                 }
 168                 if (!had_headers) {
 169                         if (strprefixcmp(line, "Date:") == 0)
 170                                 had_date = 1;
 171                         else if (strprefixcmp(line, "Message-Id:") == 0)
 172                                 had_messagid = 1;
 173                         else if (strprefixcmp(line, "From:") == 0)
 174                                 had_from = 1;
 175                 }
 176                 if (strcmp(line, "\n") == 0 && !had_headers) {
 177                         had_headers = 1;
 178                         while (!had_date || !had_messagid || !had_from) {
 179                                 if (!had_date) {
 180                                         had_date = 1;
 181                                         snprintf(line, sizeof(line), "Date: %s\n", rfc822date());
 182                                 } else if (!had_messagid) {
 183                                         /* XXX better msgid, assign earlier and log? */
 184                                         had_messagid = 1;
 185                                         snprintf(line, sizeof(line), "Message-Id: <%s@%s>\n",
 186                                                  queue->id, hostname());
 187                                 } else if (!had_from) {
 188                                         had_from = 1;
 189                                         snprintf(line, sizeof(line), "From: <%s>\n", sender);
 190                                 }
 191                                 if (fwrite(line, strlen(line), 1, queue->mailf) != 1)
 192                                         return (-1);
 193                         }
 194                         strcpy(line, "\n");
 195                 }
 196                 if (!nodot && linelen == 2 && line[0] == '.')
 197                         break;
 198                 if (fwrite(line, strlen(line), 1, queue->mailf) != 1)
 199                         return (-1);
 200         }
 201
 202         return (0);
 203 }