Mercurial > masqmail
annotate src/smtp_in.c @ 89:a917cb178ca7
what about the `rmail' alias?
| author | meillo@marmaro.de |
|---|---|
| date | Sat, 19 Jun 2010 19:00:04 +0200 (2010-06-19) |
| parents | 71ce3a1568e9 |
| children | 5ec5e6637049 |
| rev | line source |
|---|---|
| 0 | 1 /* MasqMail |
| 2 Copyright (C) 1999-2001 Oliver Kurth | |
| 80 | 3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de> |
| 0 | 4 |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2 of the License, or | |
| 8 (at your option) any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software | |
| 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
| 18 */ | |
| 19 | |
| 20 #include "masqmail.h" | |
| 21 #include "readsock.h" | |
| 22 | |
| 23 /* | |
| 24 I always forget these rfc numbers: | |
| 25 RFC 821 (SMTP) | |
| 26 RFC 1869 (ESMTP) | |
| 27 RFC 1870 (ESMTP SIZE) | |
| 28 RFC 2197 (ESMTP PIPELINE) | |
| 29 RFC 2554 (ESMTP AUTH) | |
| 30 */ | |
| 31 | |
| 32 #ifdef ENABLE_SMTP_SERVER | |
| 33 | |
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34 smtp_cmd smtp_cmds[] = { |
| 15 | 35 {SMTP_HELO, "HELO",}, |
| 36 {SMTP_EHLO, "EHLO",}, | |
| 37 {SMTP_MAIL_FROM, "MAIL FROM:",}, | |
| 38 {SMTP_RCPT_TO, "RCPT TO:",}, | |
| 39 {SMTP_DATA, "DATA",}, | |
| 40 {SMTP_QUIT, "QUIT",}, | |
| 41 {SMTP_RSET, "RSET",}, | |
| 42 {SMTP_NOOP, "NOOP",}, | |
| 43 {SMTP_HELP, "HELP"}, | |
| 0 | 44 }; |
| 45 | |
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46 static smtp_cmd_id |
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47 get_id(const gchar * line) |
| 0 | 48 { |
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49 gint i; |
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50 for (i = 0; i < SMTP_NUM_IDS; i++) { |
| 80 | 51 if (strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0) { |
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52 return (smtp_cmd_id) i; |
| 80 | 53 } |
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54 } |
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55 return SMTP_ERROR; |
| 0 | 56 } |
| 57 | |
| 58 /* this is a quick hack: we expect the address to be syntactically correct | |
| 59 and containing the mailbox only: | |
| 60 */ | |
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61 static gboolean |
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62 get_address(gchar * line, gchar * addr) |
| 0 | 63 { |
| 80 | 64 gchar *p = line; |
| 65 gchar *q = addr; | |
| 0 | 66 |
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67 /* skip MAIL FROM: and RCPT TO: */ |
| 80 | 68 while (*p && (*p != ':')) { |
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69 p++; |
| 80 | 70 } |
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71 p++; |
| 0 | 72 |
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73 /* skip spaces: */ |
| 80 | 74 while (*p && isspace(*p)) { |
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75 p++; |
| 80 | 76 } |
| 0 | 77 |
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78 /* get address: */ |
| 80 | 79 while (*p && !isspace(*p) && (q < addr + MAX_ADDRESS - 1)) { |
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80 *(q++) = *(p++); |
| 80 | 81 } |
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82 *q = 0; |
| 0 | 83 |
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84 return TRUE; |
| 0 | 85 } |
| 86 | |
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87 static smtp_connection* |
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88 create_base(gchar * remote_host) |
| 0 | 89 { |
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90 smtp_connection *base = g_malloc(sizeof(smtp_connection)); |
| 80 | 91 if (!base) { |
| 92 return NULL; | |
| 93 } | |
| 94 | |
| 95 base->remote_host = g_strdup(remote_host); | |
| 0 | 96 |
| 80 | 97 base->prot = PROT_SMTP; |
| 98 base->next_id = 0; | |
| 99 base->helo_seen = 0; | |
| 100 base->from_seen = 0; | |
| 101 base->rcpt_seen = 0; | |
| 102 base->msg = NULL; | |
| 0 | 103 |
| 80 | 104 return base; |
| 0 | 105 } |
| 106 | |
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107 static void |
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108 smtp_printf(FILE * out, gchar * fmt, ...) |
| 0 | 109 { |
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110 va_list args; |
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111 va_start(args, fmt); |
| 0 | 112 |
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113 DEBUG(4) { |
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114 gchar buf[256]; |
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115 va_list args_copy; |
| 0 | 116 |
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117 va_copy(args_copy, args); |
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118 vsnprintf(buf, 255, fmt, args_copy); |
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119 va_end(args_copy); |
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120 |
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121 debugf(">>>%s", buf); |
| 0 | 122 } |
| 123 | |
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124 vfprintf(out, fmt, args); |
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125 fflush(out); |
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126 |
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127 va_end(args); |
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128 } |
| 0 | 129 |
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130 void |
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131 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident) |
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132 { |
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133 gchar *buffer; |
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134 smtp_cmd_id cmd_id; |
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135 message *msg = NULL; |
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136 smtp_connection *psc; |
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137 int len; |
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138 |
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139 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host); |
| 0 | 140 |
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141 psc = create_base(remote_host); |
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142 psc->msg = msg; |
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143 |
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144 buffer = (gchar *) g_malloc(BUF_LEN); |
| 80 | 145 if (!buffer) { |
| 146 /* this check is actually unneccessary as g_malloc() | |
| 147 aborts on failure */ | |
| 148 return; | |
| 149 } | |
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150 |
| 80 | 151 /* send greeting string, containing ESMTP: */ |
| 152 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION); | |
| 0 | 153 |
| 80 | 154 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) { |
| 155 cmd_id = get_id(buffer); | |
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156 |
| 80 | 157 switch (cmd_id) { |
| 158 case SMTP_EHLO: | |
| 159 psc->prot = PROT_ESMTP; | |
| 160 /* fall through */ | |
| 161 case SMTP_HELO: | |
| 162 psc->helo_seen = TRUE; | |
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163 |
| 80 | 164 if (conf.defer_all) { /* I need this to debug delivery failures */ |
| 165 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name); | |
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166 break; |
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167 } |
| 80 | 168 |
| 169 if (psc->prot == PROT_ESMTP) { | |
| 170 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name); | |
| 171 /* not yet: fprintf(out, "250-SIZE\r\n"); */ | |
| 172 smtp_printf(out, "250-PIPELINING\r\n" "250 HELP\r\n"); | |
| 173 } else { | |
| 174 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name); | |
| 175 } | |
| 176 break; | |
| 177 | |
| 178 case SMTP_MAIL_FROM: | |
| 179 { | |
| 180 gchar buf[MAX_ADDRESS]; | |
| 181 address *addr; | |
| 182 | |
| 183 if (!psc->helo_seen) { | |
| 184 smtp_printf(out, "503 need HELO or EHLO\r\n"); | |
| 185 break; | |
| 186 } | |
| 187 if (psc->from_seen) { | |
| 188 smtp_printf(out, "503 MAIL FROM: already given.\r\n"); | |
| 189 break; | |
| 190 } | |
| 191 | |
| 192 msg = create_message(); | |
| 193 msg->received_host = remote_host ? g_strdup(remote_host) : NULL; | |
| 194 msg->received_prot = psc->prot; | |
| 195 msg->ident = ident ? g_strdup(ident) : NULL; | |
| 196 /* get transfer id and increment for next one */ | |
| 197 msg->transfer_id = (psc->next_id)++; | |
| 198 | |
| 199 get_address(buffer, buf); | |
| 200 if (remote_host) { | |
| 201 addr = create_address(buf, TRUE); | |
| 202 } else { | |
| 203 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 204 } | |
| 205 if (!addr) { | |
| 206 smtp_printf(out, "501 %s: syntax error.\r\n", buf); | |
| 207 } else if (!addr->domain) { | |
| 208 smtp_printf(out, "501 return path must be qualified.\r\n", buf); | |
| 209 } else { | |
| 210 psc->from_seen = TRUE; | |
| 211 msg->return_path = addr; | |
| 212 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address); | |
| 213 } | |
| 214 } | |
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215 break; |
| 80 | 216 |
| 217 case SMTP_RCPT_TO: | |
| 218 { | |
| 219 char buf[MAX_ADDRESS]; | |
| 220 address *addr; | |
| 221 | |
| 222 if (!psc->helo_seen) { | |
| 223 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 224 break; | |
| 225 } | |
| 226 if (!psc->from_seen) { | |
| 227 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n"); | |
| 228 break; | |
| 229 } | |
| 230 | |
| 231 get_address(buffer, buf); | |
| 232 if (remote_host) { | |
| 233 addr = create_address(buf, TRUE); | |
| 234 } else { | |
| 235 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 236 } | |
| 237 if (!addr) { | |
| 238 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf); | |
| 239 break; | |
| 240 } | |
| 241 if (addr->local_part[0] == '|') { | |
| 242 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf); | |
| 243 break; | |
| 244 } | |
| 245 if (!addr->domain) { | |
| 246 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf); | |
| 247 break; | |
| 248 } | |
| 249 gboolean do_relay = conf.do_relay; | |
| 250 if (!do_relay) { | |
| 251 do_relay = addr_is_local(msg->return_path); | |
| 252 if (!do_relay) { | |
| 253 do_relay = addr_is_local(addr); | |
| 254 } | |
| 255 } | |
| 256 if (!do_relay) { | |
| 257 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr)); | |
| 258 break; | |
| 259 } | |
| 260 psc->rcpt_seen = TRUE; | |
| 261 msg->rcpt_list = g_list_append(msg->rcpt_list, addr); | |
| 262 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address); | |
| 263 } | |
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264 break; |
| 80 | 265 |
| 266 case SMTP_DATA: | |
| 267 if (!psc->helo_seen) { | |
| 268 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 269 break; | |
| 270 } | |
| 271 if (!psc->rcpt_seen) { | |
| 272 smtp_printf(out, "503 need RCPT TO: before DATA\r\n"); | |
| 273 break; | |
| 274 } | |
| 275 accept_error err; | |
| 276 | |
| 277 smtp_printf(out, "354 okay, and do not forget the dot\r\n"); | |
| 278 | |
| 279 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0); | |
| 280 if (err != AERR_OK) { | |
| 281 if (err == AERR_TIMEOUT || err == AERR_EOF) { | |
| 282 return; | |
| 283 } | |
| 284 /* should never happen: */ | |
| 285 smtp_printf(out, "451 Unknown error\r\n"); | |
| 286 return; | |
| 287 } | |
| 288 | |
| 289 | |
| 290 if (!spool_write(msg, TRUE)) { | |
| 291 smtp_printf(out, "451 Could not write spool file\r\n"); | |
| 292 return; | |
| 293 } | |
| 294 pid_t pid; | |
| 295 smtp_printf(out, "250 OK id=%s\r\n", msg->uid); | |
| 296 | |
| 297 if (remote_host != NULL) { | |
| 298 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid, | |
| 299 msg->return_path->local_part, msg->return_path->domain, | |
| 300 remote_host, prot_names[psc->prot]); | |
| 301 } else { | |
| 302 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid, | |
| 303 msg->return_path->local_part, msg->return_path->domain, | |
| 304 prot_names[psc->prot]); | |
| 305 } | |
| 306 | |
| 307 if (conf.do_queue) { | |
| 308 DEBUG(1) debugf("queuing forced by configuration or option.\n"); | |
| 309 } else { | |
| 310 pid = fork(); | |
| 311 if (pid == 0) { | |
| 312 _exit(deliver(msg)); | |
| 313 } else if (pid < 0) { | |
| 314 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid); | |
| 315 } | |
| 316 } | |
| 317 psc->rcpt_seen = psc->from_seen = FALSE; | |
| 318 destroy_message(msg); | |
| 319 msg = NULL; | |
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320 break; |
| 80 | 321 |
| 322 case SMTP_QUIT: | |
| 323 smtp_printf(out, "221 goodbye\r\n"); | |
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324 destroy_message(msg); |
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325 msg = NULL; |
| 80 | 326 return; |
| 327 | |
| 328 case SMTP_RSET: | |
| 329 psc->from_seen = psc->rcpt_seen = FALSE; | |
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330 destroy_message(msg); |
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meillo@marmaro.de
parents:
80
diff
changeset
|
331 msg = NULL; |
| 80 | 332 smtp_printf(out, "250 OK\r\n"); |
| 333 break; | |
| 334 | |
| 335 case SMTP_NOOP: | |
| 336 smtp_printf(out, "250 OK\r\n"); | |
| 337 break; | |
| 338 | |
| 339 case SMTP_HELP: | |
| 340 { | |
| 341 int i; | |
| 342 | |
| 343 smtp_printf(out, "214-supported commands:\r\n"); | |
| 344 for (i = 0; i < SMTP_NUM_IDS - 1; i++) { | |
| 345 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd); | |
| 346 } | |
| 347 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd); | |
| 348 } | |
| 349 break; | |
| 350 | |
|
10
26e34ae9a3e3
changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents:
0
diff
changeset
|
351 default: |
| 80 | 352 smtp_printf(out, "501 command not recognized\r\n"); |
| 353 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer); | |
|
10
26e34ae9a3e3
changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents:
0
diff
changeset
|
354 break; |
|
26e34ae9a3e3
changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents:
0
diff
changeset
|
355 } |
| 0 | 356 } |
| 80 | 357 switch (len) { |
| 358 case -3: | |
| 359 logwrite(LOG_NOTICE, "connection timed out\n"); | |
| 360 break; | |
| 361 case -2: | |
| 362 logwrite(LOG_NOTICE, "line overflow\n"); | |
| 363 break; | |
| 364 case -1: | |
| 365 logwrite(LOG_NOTICE, "received EOF\n"); | |
| 366 break; | |
| 367 default: | |
| 368 break; | |
| 369 } | |
| 0 | 370 } |
| 371 #endif |