masqmail

annotate src/accept.c @ 285:bdcc2b42eb0f

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Heavily reworked man/masqmail.8 I hope the new version is clearer.
author markus schnalke <meillo@marmaro.de>
date Tue, 07 Dec 2010 17:10:07 -0300
parents 1405012509e3
children bb3005ce0837
rev   line source
meillo@0 1 /* MasqMail
meillo@0 2 Copyright (C) 1999-2001 Oliver Kurth
meillo@224 3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
meillo@0 4
meillo@0 5 This program is free software; you can redistribute it and/or modify
meillo@0 6 it under the terms of the GNU General Public License as published by
meillo@0 7 the Free Software Foundation; either version 2 of the License, or
meillo@0 8 (at your option) any later version.
meillo@0 9
meillo@0 10 This program is distributed in the hope that it will be useful,
meillo@0 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@0 13 GNU General Public License for more details.
meillo@0 14
meillo@0 15 You should have received a copy of the GNU General Public License
meillo@0 16 along with this program; if not, write to the Free Software
meillo@0 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 18 */
meillo@0 19
meillo@0 20 #include "masqmail.h"
meillo@0 21 #include "readsock.h"
meillo@0 22
meillo@10 23 gchar *prot_names[] = {
meillo@10 24 "local",
meillo@10 25 "bsmtp",
meillo@10 26 "smtp",
meillo@10 27 "esmtp",
meillo@10 28 "(unknown)" /* should not happen, but better than crashing. */
meillo@0 29 };
meillo@0 30
meillo@10 31 static gchar*
meillo@10 32 string_base62(gchar * res, guint value, gchar len)
meillo@0 33 {
meillo@10 34 static gchar base62_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
meillo@10 35 gchar *p = res + len;
meillo@14 36 *p = '\0';
meillo@10 37 while (p > res) {
meillo@10 38 *(--p) = base62_chars[value % 62];
meillo@10 39 value /= 62;
meillo@10 40 }
meillo@10 41 return res;
meillo@0 42 }
meillo@0 43
meillo@10 44 static gint
meillo@10 45 _g_list_addr_isequal(gconstpointer a, gconstpointer b)
meillo@0 46 {
meillo@10 47 address *addr1 = (address *) a;
meillo@10 48 address *addr2 = (address *) b;
meillo@10 49 int ret;
meillo@0 50
meillo@270 51 if ((ret = strcasecmp(addr1->domain, addr2->domain)) == 0) {
meillo@10 52 return strcmp(addr1->local_part, addr2->local_part);
meillo@270 53 }
meillo@270 54 return ret;
meillo@0 55 }
meillo@0 56
meillo@0 57 /* accept message from anywhere.
meillo@276 58 A message from local is indicated by msg->recieved_host == NULL
meillo@0 59
meillo@276 60 The -t option: With the ACC_RCPT_FROM_HEAD flag the addrs found found
meillo@276 61 in To/Cc/Bcc headers are added to the recipient list.
meillo@0 62 */
meillo@0 63
meillo@10 64 accept_error
meillo@10 65 accept_message_stream(FILE * in, message * msg, guint flags)
meillo@0 66 {
meillo@10 67 gchar *line, *line1;
meillo@10 68 int line_size = MAX_DATALINE;
meillo@10 69 gboolean in_headers = TRUE;
meillo@10 70 header *hdr = NULL;
meillo@10 71 gint line_cnt = 0, data_size = 0;
meillo@0 72
meillo@10 73 line = g_malloc(line_size);
meillo@14 74 line[0] = '\0';
meillo@0 75
meillo@10 76 while (TRUE) {
meillo@10 77 int len = read_sockline1(in, &line, &line_size, 5 * 60, READSOCKL_CVT_CRLF);
meillo@0 78
meillo@10 79 line1 = line;
meillo@0 80
meillo@110 81 if ((line[0] == '.') && (!(flags & ACC_DOT_IGNORE))) {
meillo@10 82 if (line[1] == '\n') {
meillo@10 83 g_free(line);
meillo@10 84 break;
meillo@10 85 }
meillo@10 86 line1++;
meillo@10 87 }
meillo@10 88
meillo@270 89 if ((len == -1) && (flags & (ACC_DOT_IGNORE | ACC_NODOT_RELAX))) {
meillo@270 90 /* we got an EOF, and the last line was not terminated by a CR */
meillo@270 91 gint len1 = strlen(line1);
meillo@270 92 if (len1 > 0) { /* == 0 is 'normal' (EOF after a CR) */
meillo@270 93 if (line1[len1 - 1] != '\n') { /* some mail clients allow unterminated lines */
meillo@270 94 line1[len1] = '\n';
meillo@270 95 line1[len1 + 1] = '\0';
meillo@270 96 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
meillo@270 97 data_size += strlen(line1);
meillo@270 98 line_cnt++;
meillo@10 99 }
meillo@270 100 }
meillo@270 101 break;
meillo@270 102
meillo@270 103 } else if (len == -1) {
meillo@270 104 g_free(line);
meillo@270 105 return AERR_EOF;
meillo@270 106
meillo@270 107 } else if (len == -2) {
meillo@270 108 /* should not happen any more */
meillo@270 109 g_free(line);
meillo@270 110 return AERR_OVERFLOW;
meillo@270 111
meillo@270 112 } else if (len == -3) {
meillo@270 113 g_free(line);
meillo@270 114 return AERR_TIMEOUT;
meillo@270 115
meillo@270 116 } else if (len <= 0) {
meillo@270 117 /* does not happen */
meillo@270 118 g_free(line);
meillo@270 119 DEBUG(5) debugf("read_sockline returned %d\n", len);
meillo@270 120 return AERR_UNKNOWN;
meillo@270 121
meillo@270 122 }
meillo@270 123
meillo@270 124 if (in_headers) {
meillo@270 125
meillo@270 126 /* some pop servers send the 'From ' line, skip it: */
meillo@270 127 if (!msg->hdr_list && strncmp(line1, "From ", 5) == 0) {
meillo@270 128 continue;
meillo@270 129 }
meillo@270 130
meillo@270 131 if (line1[0] == ' ' || line1[0] == '\t') {
meillo@270 132 /* continuation of 'folded' header: */
meillo@270 133 if (hdr) {
meillo@270 134 hdr->header = g_strconcat(hdr->header, line1, NULL);
meillo@270 135 }
meillo@270 136
meillo@270 137 } else if (line1[0] == '\n') {
meillo@270 138 /* an empty line marks end of headers */
meillo@270 139 in_headers = FALSE;
meillo@10 140 } else {
meillo@270 141 /* in all other cases we expect another header */
meillo@270 142 if ((hdr = get_header(line1))) {
meillo@270 143 msg->hdr_list = g_list_append(msg->hdr_list, hdr);
meillo@10 144 } else {
meillo@270 145 /* if get_header() returns NULL, no header was recognized,
meillo@270 146 so this seems to be the first data line of a broken mailer
meillo@270 147 which does not send an empty line after the headers */
meillo@270 148 in_headers = FALSE;
meillo@270 149 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
meillo@10 150 }
meillo@10 151 }
meillo@10 152 } else {
meillo@270 153 /* message body */
meillo@270 154 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
meillo@270 155 data_size += strlen(line1);
meillo@270 156 line_cnt++;
meillo@270 157 }
meillo@10 158
meillo@120 159 if (conf.max_msg_size && (data_size > conf.max_msg_size)) {
meillo@117 160 DEBUG(4) debugf("accept_message_stream(): "
meillo@117 161 "received %d bytes (conf.max_msg_size=%d)\n",
meillo@117 162 data_size, conf.max_msg_size);
meillo@117 163 return AERR_SIZE;
meillo@117 164 }
meillo@117 165
meillo@0 166 }
meillo@0 167
meillo@270 168 DEBUG(4) debugf("received %d lines of data (%d bytes)\n", line_cnt, data_size);
meillo@270 169
meillo@270 170 if (!msg->data_list) {
meillo@10 171 /* make sure data list is not NULL: */
meillo@10 172 msg->data_list = g_list_append(NULL, g_strdup(""));
meillo@270 173 }
meillo@270 174 msg->data_list = g_list_reverse(msg->data_list);
meillo@0 175
meillo@10 176 /* we get here after we succesfully received the mail data */
meillo@0 177
meillo@10 178 msg->data_size = data_size;
meillo@10 179 msg->received_time = time(NULL);
meillo@0 180
meillo@10 181 return AERR_OK;
meillo@0 182 }
meillo@0 183
meillo@10 184 accept_error
meillo@10 185 accept_message_prepare(message * msg, guint flags)
meillo@0 186 {
meillo@10 187 struct passwd *passwd = NULL;
meillo@10 188 time_t rec_time = time(NULL);
meillo@0 189
meillo@10 190 DEBUG(5) debugf("accept_message_prepare()\n");
meillo@0 191
meillo@10 192 /* create unique message id */
meillo@10 193 msg->uid = g_malloc(14);
meillo@0 194
meillo@10 195 string_base62(msg->uid, rec_time, 6);
meillo@10 196 msg->uid[6] = '-';
meillo@10 197 string_base62(&(msg->uid[7]), getpid(), 3);
meillo@10 198 msg->uid[10] = '-';
meillo@10 199 string_base62(&(msg->uid[11]), msg->transfer_id, 2);
meillo@10 200 msg->uid[13] = 0;
meillo@0 201
meillo@10 202 /* if local, get password entry */
meillo@10 203 if (msg->received_host == NULL) {
meillo@10 204 passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));
meillo@10 205 msg->ident = g_strdup(passwd->pw_name);
meillo@10 206 }
meillo@0 207
meillo@10 208 /* set return path if local */
meillo@22 209 if (msg->return_path == NULL && msg->received_host == NULL) {
meillo@22 210 gchar *path = g_strdup_printf("<%s@%s>", passwd->pw_name, conf.host_name);
meillo@22 211 DEBUG(3) debugf("setting return_path for local accept: %s\n", path);
meillo@22 212 msg->return_path = create_address(path, TRUE);
meillo@22 213 g_free(path);
meillo@10 214 }
meillo@0 215
meillo@10 216 /* scan headers */
meillo@10 217 {
meillo@10 218 gboolean has_id = FALSE;
meillo@10 219 gboolean has_date = FALSE;
meillo@10 220 gboolean has_sender = FALSE;
meillo@10 221 gboolean has_from = FALSE;
meillo@10 222 gboolean has_to_or_cc = FALSE;
meillo@10 223 GList *hdr_node, *hdr_node_next;
meillo@10 224 header *hdr;
meillo@0 225
meillo@10 226 for (hdr_node = g_list_first(msg->hdr_list);
meillo@10 227 hdr_node != NULL; hdr_node = hdr_node_next) {
meillo@10 228 hdr_node_next = g_list_next(hdr_node);
meillo@10 229 hdr = ((header *) (hdr_node->data));
meillo@10 230 DEBUG(5) debugf("scanning headers: %s", hdr->header);
meillo@10 231 switch (hdr->id) {
meillo@10 232 case HEAD_MESSAGE_ID:
meillo@10 233 has_id = TRUE;
meillo@10 234 break;
meillo@10 235 case HEAD_DATE:
meillo@10 236 has_date = TRUE;
meillo@10 237 break;
meillo@10 238 case HEAD_FROM:
meillo@10 239 has_from = TRUE;
meillo@10 240 break;
meillo@10 241 case HEAD_SENDER:
meillo@10 242 has_sender = TRUE;
meillo@10 243 break;
meillo@10 244 case HEAD_TO:
meillo@10 245 case HEAD_CC:
meillo@106 246 has_to_or_cc = TRUE;
meillo@106 247 /* fall through */
meillo@10 248 case HEAD_BCC:
meillo@10 249 if (flags & ACC_RCPT_FROM_HEAD) {
meillo@109 250 /* -t option (see comment above) */
meillo@10 251 DEBUG(5) debugf("hdr->value = %s\n", hdr->value);
meillo@10 252 if (hdr->value) {
meillo@10 253 msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);
meillo@10 254 }
meillo@10 255 }
meillo@106 256 if (hdr->id == HEAD_BCC) {
meillo@10 257 DEBUG(3) debugf("removing 'Bcc' header\n");
meillo@10 258 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
meillo@10 259 g_list_free_1(hdr_node);
meillo@10 260 destroy_header(hdr);
meillo@106 261 }
meillo@10 262 break;
meillo@10 263 case HEAD_ENVELOPE_TO:
meillo@10 264 if (flags & ACC_SAVE_ENVELOPE_TO) {
meillo@10 265 DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");
meillo@22 266 msg->hdr_list = g_list_prepend(msg->hdr_list, create_header(HEAD_UNKNOWN,
meillo@276 267 "X-Orig-Envelope-To: %s", hdr->value));
meillo@10 268 }
meillo@10 269 DEBUG(3) debugf("removing 'Envelope-To' header\n");
meillo@10 270 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
meillo@10 271 g_list_free_1(hdr_node);
meillo@10 272 destroy_header(hdr);
meillo@10 273 break;
meillo@10 274 case HEAD_RETURN_PATH:
meillo@10 275 if (flags & ACC_MAIL_FROM_HEAD) {
meillo@10 276 /* usually POP3 accept */
meillo@10 277 msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);
meillo@10 278 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
meillo@10 279 }
meillo@10 280 DEBUG(3) debugf("removing 'Return-Path' header\n");
meillo@10 281 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
meillo@10 282 g_list_free_1(hdr_node);
meillo@10 283 destroy_header(hdr);
meillo@10 284 break;
meillo@10 285 default:
meillo@10 286 break; /* make compiler happy */
meillo@10 287 }
meillo@10 288 }
meillo@10 289
meillo@10 290 if (msg->return_path == NULL) {
meillo@10 291 /* this can happen for pop3 accept only and if no Return-path: header was given */
meillo@10 292 GList *hdr_list;
meillo@10 293 header *hdr;
meillo@10 294
meillo@10 295 DEBUG(3) debugf("return_path == NULL\n");
meillo@10 296
meillo@10 297 hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);
meillo@10 298 if (!hdr_list)
meillo@10 299 hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);
meillo@10 300 if (hdr_list) {
meillo@10 301 gchar *addr;
meillo@10 302 hdr = (header *) (g_list_first(hdr_list)->data);
meillo@10 303
meillo@10 304 DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);
meillo@10 305
meillo@10 306 addr = g_strdup(hdr->value);
meillo@10 307 g_strchomp(addr);
meillo@10 308
meillo@10 309 if ((msg->return_path = create_address_qualified(addr, FALSE, msg->received_host)) != NULL) {
meillo@10 310 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
meillo@13 311 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,
meillo@13 312 "X-Warning: return path set from %s address\n",
meillo@13 313 hdr->id == HEAD_SENDER ? "Sender:" : "From:"));
meillo@10 314 }
meillo@10 315 g_free(addr);
meillo@10 316 }
meillo@10 317 if (msg->return_path == NULL) { /* no Sender: or From: or create_address_qualified failed */
meillo@10 318 msg->return_path = create_address_qualified("postmaster", TRUE, conf.host_name);
meillo@10 319 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
meillo@13 320 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,
meillo@25 321 "X-Warning: real return path is unknown\n"));
meillo@10 322 }
meillo@10 323 }
meillo@10 324
meillo@10 325 /* here we should have our recipients, fail if not: */
meillo@276 326 if (!msg->rcpt_list) {
meillo@10 327 logwrite(LOG_WARNING, "no recipients found in message\n");
meillo@10 328 return AERR_NORCPT;
meillo@10 329 }
meillo@10 330
meillo@10 331 if (!(has_sender || has_from)) {
meillo@10 332 DEBUG(3) debugf("adding 'From' header\n");
meillo@10 333 msg->hdr_list = g_list_append(msg->hdr_list,
meillo@10 334 msg->full_sender_name
meillo@10 335 ?
meillo@13 336 create_header(HEAD_FROM, "From: \"%s\" <%s@%s>\n", msg->full_sender_name,
meillo@13 337 msg->return_path->local_part, msg->return_path->domain)
meillo@10 338 :
meillo@10 339 create_header(HEAD_FROM, "From: <%s@%s>\n",
meillo@13 340 msg->return_path->local_part, msg->return_path->domain)
meillo@10 341 );
meillo@10 342 }
meillo@106 343 if (!has_to_or_cc) {
meillo@106 344 DEBUG(3) debugf("no To: or Cc: header, hence adding `To: undisclosed recipients:;'\n");
meillo@105 345 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_TO, "To: undisclosed-recipients:;\n"));
meillo@10 346 }
meillo@10 347 if (!has_date) {
meillo@10 348 DEBUG(3) debugf("adding 'Date:' header\n");
meillo@10 349 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_DATE, "Date: %s\n", rec_timestamp()));
meillo@10 350 }
meillo@10 351 if (!has_id) {
meillo@10 352 DEBUG(3) debugf("adding 'Message-ID:' header\n");
meillo@13 353 msg->hdr_list = g_list_append(msg->hdr_list,
meillo@13 354 create_header(HEAD_MESSAGE_ID, "Message-ID: <%s@%s>\n", msg->uid, conf.host_name));
meillo@10 355 }
meillo@0 356 }
meillo@10 357
meillo@10 358 /* Received header: */
meillo@10 359 /* At this point because we have to know the rcpts for the 'for' part */
meillo@102 360 gchar *for_string = NULL;
meillo@102 361 header *hdr = NULL;
meillo@10 362
meillo@102 363 DEBUG(3) debugf("adding 'Received:' header\n");
meillo@10 364
meillo@102 365 if (g_list_length(msg->rcpt_list) == 1) {
meillo@102 366 address *addr = (address *) (g_list_first(msg->rcpt_list)->data);
meillo@102 367 for_string = g_strdup_printf(" for %s", addr_string(addr));
meillo@102 368 }
meillo@10 369
meillo@102 370 if (msg->received_host == NULL) {
meillo@102 371 /* received locally */
meillo@102 372 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
meillo@102 373 passwd->pw_name, conf.host_name, prot_names[msg->received_prot],
meillo@102 374 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());
meillo@102 375 } else {
meillo@102 376 /* received from remote */
meillo@10 377 #ifdef ENABLE_IDENT
meillo@102 378 DEBUG(5) debugf("adding 'Received:' header (5)\n");
meillo@102 379 hdr = create_header(HEAD_RECEIVED, "Received: from %s (ident=%s) by %s with %s (%s %s) id %s%s; %s\n",
meillo@102 380 msg->received_host, msg->ident ? msg->ident : "unknown", conf.host_name,
meillo@102 381 prot_names[msg->received_prot], PACKAGE, VERSION, msg->uid, for_string ? for_string : "",
meillo@102 382 rec_timestamp());
meillo@10 383 #else
meillo@102 384 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
meillo@102 385 msg->received_host, conf.host_name, prot_names[msg->received_prot],
meillo@102 386 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());
meillo@10 387 #endif
meillo@102 388 }
meillo@102 389 header_fold(hdr);
meillo@102 390 msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);
meillo@10 391
meillo@102 392 if (for_string)
meillo@102 393 g_free(for_string);
meillo@0 394
meillo@10 395 return AERR_OK;
meillo@0 396 }
meillo@0 397
meillo@10 398 accept_error
meillo@10 399 accept_message(FILE * in, message * msg, guint flags)
meillo@0 400 {
meillo@10 401 accept_error err;
meillo@0 402
meillo@10 403 err = accept_message_stream(in, msg, flags);
meillo@270 404 if (err == AERR_OK) {
meillo@10 405 err = accept_message_prepare(msg, flags);
meillo@270 406 }
meillo@0 407
meillo@10 408 return err;
meillo@0 409 }