Mercurial > masqmail
annotate src/smtp_in.c @ 172:cd38f10532e7
merge
| author | meillo@marmaro.de |
|---|---|
| date | Wed, 14 Jul 2010 00:55:22 +0200 |
| parents | 6b78aaced5e1 |
| children | 5745edd5b769 |
| 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 | |
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58 static gboolean |
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59 get_size(gchar *line, unsigned long *msize) { |
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60 gchar *s = NULL; |
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61 |
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62 /* hope we need not to handle cases like SiZe= ...*/ |
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63 s = strstr(line, "SIZE="); |
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64 if (!s) { |
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65 /* try it in lowercase too */ |
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66 if (!(s = strstr(line, "size="))) { |
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67 return FALSE; |
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68 } |
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69 } |
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70 s += 5; |
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71 *msize = atol(s); |
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72 DEBUG(5) debugf("get_size(): line=%s, msize=%ld\n", line, *msize); |
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73 |
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74 return TRUE; |
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75 } |
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76 |
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77 |
| 0 | 78 /* this is a quick hack: we expect the address to be syntactically correct |
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79 and containing the mailbox only, though we first check for size in |
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80 smtp_in(). |
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81 Return false if address is too long. |
| 0 | 82 */ |
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83 static gboolean |
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84 get_address(gchar * line, gchar * addr) |
| 0 | 85 { |
| 80 | 86 gchar *p = line; |
| 87 gchar *q = addr; | |
| 0 | 88 |
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89 /* skip MAIL FROM: and RCPT TO: */ |
| 80 | 90 while (*p && (*p != ':')) { |
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91 p++; |
| 80 | 92 } |
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93 p++; |
| 0 | 94 |
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95 /* skip spaces: */ |
| 80 | 96 while (*p && isspace(*p)) { |
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97 p++; |
| 80 | 98 } |
| 0 | 99 |
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100 /* get address: */ |
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101 while (*p && !isspace(*p)) { |
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102 if (q >= addr + MAX_ADDRESS-1) { |
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103 *q = '\0'; |
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104 return FALSE; |
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105 } |
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106 *(q++) = *(p++); |
| 80 | 107 } |
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108 *q = '\0'; |
| 0 | 109 |
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110 return TRUE; |
| 0 | 111 } |
| 112 | |
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113 static smtp_connection* |
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114 create_base(gchar * remote_host) |
| 0 | 115 { |
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116 smtp_connection *base = g_malloc(sizeof(smtp_connection)); |
| 80 | 117 if (!base) { |
| 118 return NULL; | |
| 119 } | |
| 120 | |
| 121 base->remote_host = g_strdup(remote_host); | |
| 0 | 122 |
| 80 | 123 base->prot = PROT_SMTP; |
| 124 base->next_id = 0; | |
| 125 base->helo_seen = 0; | |
| 126 base->from_seen = 0; | |
| 127 base->rcpt_seen = 0; | |
| 128 base->msg = NULL; | |
| 0 | 129 |
| 80 | 130 return base; |
| 0 | 131 } |
| 132 | |
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133 static void |
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134 smtp_printf(FILE * out, gchar * fmt, ...) |
| 0 | 135 { |
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136 va_list args; |
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137 va_start(args, fmt); |
| 0 | 138 |
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139 DEBUG(4) { |
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140 gchar buf[256]; |
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141 va_list args_copy; |
| 0 | 142 |
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143 va_copy(args_copy, args); |
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144 vsnprintf(buf, 255, fmt, args_copy); |
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145 va_end(args_copy); |
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146 |
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147 debugf(">>>%s", buf); |
| 0 | 148 } |
| 149 | |
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150 vfprintf(out, fmt, args); |
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151 fflush(out); |
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152 |
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153 va_end(args); |
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154 } |
| 0 | 155 |
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156 void |
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157 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident) |
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158 { |
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159 gchar *buffer; |
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160 smtp_cmd_id cmd_id; |
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161 message *msg = NULL; |
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162 smtp_connection *psc; |
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163 int len; |
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164 unsigned long size, msize; |
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165 |
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166 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host); |
| 0 | 167 |
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168 psc = create_base(remote_host); |
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169 psc->msg = msg; |
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170 |
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171 buffer = (gchar *) g_malloc(BUF_LEN); |
| 80 | 172 if (!buffer) { |
| 173 /* this check is actually unneccessary as g_malloc() | |
| 174 aborts on failure */ | |
| 175 return; | |
| 176 } | |
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177 |
| 80 | 178 /* send greeting string, containing ESMTP: */ |
| 179 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION); | |
| 0 | 180 |
| 80 | 181 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) { |
| 182 cmd_id = get_id(buffer); | |
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183 |
| 135 | 184 if (conf.defer_all) { |
| 185 /* I need this to debug delivery failures */ | |
| 127 | 186 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name); |
| 135 | 187 destroy_message(msg); |
| 188 msg = NULL; | |
| 189 return; | |
| 127 | 190 } |
| 191 | |
| 80 | 192 switch (cmd_id) { |
| 127 | 193 case SMTP_HELO: |
| 194 psc->prot = PROT_SMTP; | |
| 195 psc->helo_seen = TRUE; | |
| 196 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name); | |
| 197 break; | |
| 198 | |
| 80 | 199 case SMTP_EHLO: |
| 200 psc->prot = PROT_ESMTP; | |
| 201 psc->helo_seen = TRUE; | |
| 127 | 202 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name); |
| 203 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size); | |
| 204 smtp_printf(out, "250-PIPELINING\r\n"); | |
| 205 smtp_printf(out, "250 HELP\r\n"); | |
| 80 | 206 break; |
| 207 | |
| 208 case SMTP_MAIL_FROM: | |
| 209 { | |
| 210 gchar buf[MAX_ADDRESS]; | |
| 211 address *addr; | |
| 212 | |
| 213 if (!psc->helo_seen) { | |
| 214 smtp_printf(out, "503 need HELO or EHLO\r\n"); | |
| 215 break; | |
| 216 } | |
| 217 if (psc->from_seen) { | |
| 218 smtp_printf(out, "503 MAIL FROM: already given.\r\n"); | |
| 219 break; | |
| 220 } | |
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221 if (get_size(buffer, &msize)) { |
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222 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n", |
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223 msize, conf.max_msg_size); |
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224 if (conf.max_msg_size && (msize > conf.max_msg_size)) { |
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225 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n"); |
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226 break; |
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227 } |
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228 } |
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229 if (!get_address(buffer, buf)) { |
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230 smtp_printf(out, "553 Address too long.\r\n"); |
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231 break; |
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232 } |
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233 |
| 80 | 234 msg = create_message(); |
| 235 msg->received_host = remote_host ? g_strdup(remote_host) : NULL; | |
| 236 msg->received_prot = psc->prot; | |
| 237 msg->ident = ident ? g_strdup(ident) : NULL; | |
| 238 /* get transfer id and increment for next one */ | |
| 239 msg->transfer_id = (psc->next_id)++; | |
| 240 | |
| 241 if (remote_host) { | |
| 242 addr = create_address(buf, TRUE); | |
| 243 } else { | |
| 244 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 245 } | |
| 246 if (!addr) { | |
| 247 smtp_printf(out, "501 %s: syntax error.\r\n", buf); | |
| 248 } else if (!addr->domain) { | |
| 249 smtp_printf(out, "501 return path must be qualified.\r\n", buf); | |
| 250 } else { | |
| 251 psc->from_seen = TRUE; | |
| 252 msg->return_path = addr; | |
| 253 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address); | |
| 254 } | |
| 255 } | |
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256 break; |
| 80 | 257 |
| 258 case SMTP_RCPT_TO: | |
| 259 { | |
| 260 char buf[MAX_ADDRESS]; | |
| 261 address *addr; | |
| 262 | |
| 263 if (!psc->helo_seen) { | |
| 264 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 265 break; | |
| 266 } | |
| 267 if (!psc->from_seen) { | |
| 268 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n"); | |
| 269 break; | |
| 270 } | |
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271 if (!get_address(buffer, buf)) { |
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272 smtp_printf(out, "553 Address too long.\r\n"); |
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273 break; |
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274 } |
| 80 | 275 |
| 276 if (remote_host) { | |
| 277 addr = create_address(buf, TRUE); | |
| 278 } else { | |
| 279 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 280 } | |
| 281 if (!addr) { | |
| 282 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf); | |
| 283 break; | |
| 284 } | |
| 285 if (addr->local_part[0] == '|') { | |
| 286 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf); | |
| 287 break; | |
| 288 } | |
| 289 if (!addr->domain) { | |
| 290 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf); | |
| 291 break; | |
| 292 } | |
| 293 gboolean do_relay = conf.do_relay; | |
| 294 if (!do_relay) { | |
| 295 do_relay = addr_is_local(msg->return_path); | |
| 296 if (!do_relay) { | |
| 297 do_relay = addr_is_local(addr); | |
| 298 } | |
| 299 } | |
| 300 if (!do_relay) { | |
| 301 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr)); | |
| 302 break; | |
| 303 } | |
| 304 psc->rcpt_seen = TRUE; | |
| 305 msg->rcpt_list = g_list_append(msg->rcpt_list, addr); | |
| 306 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address); | |
| 307 } | |
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308 break; |
| 80 | 309 |
| 310 case SMTP_DATA: | |
| 311 if (!psc->helo_seen) { | |
| 312 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 313 break; | |
| 314 } | |
| 315 if (!psc->rcpt_seen) { | |
| 316 smtp_printf(out, "503 need RCPT TO: before DATA\r\n"); | |
| 317 break; | |
| 318 } | |
| 319 accept_error err; | |
| 320 | |
| 321 smtp_printf(out, "354 okay, and do not forget the dot\r\n"); | |
| 322 | |
| 323 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0); | |
| 324 if (err != AERR_OK) { | |
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325 switch (err) { |
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326 case AERR_TIMEOUT: |
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327 case AERR_EOF: |
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328 return; |
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329 case AERR_SIZE: |
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330 smtp_printf(out, "552 Error: message too large.\r\n"); |
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331 return; |
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332 default: |
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333 /* should never happen: */ |
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334 smtp_printf(out, "451 Unknown error\r\n"); |
| 80 | 335 return; |
| 336 } | |
| 337 } | |
| 338 | |
| 339 | |
| 340 if (!spool_write(msg, TRUE)) { | |
| 341 smtp_printf(out, "451 Could not write spool file\r\n"); | |
| 342 return; | |
| 343 } | |
| 344 pid_t pid; | |
| 345 smtp_printf(out, "250 OK id=%s\r\n", msg->uid); | |
| 346 | |
| 347 if (remote_host != NULL) { | |
| 348 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid, | |
| 349 msg->return_path->local_part, msg->return_path->domain, | |
| 350 remote_host, prot_names[psc->prot]); | |
| 351 } else { | |
| 352 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid, | |
| 353 msg->return_path->local_part, msg->return_path->domain, | |
| 354 prot_names[psc->prot]); | |
| 355 } | |
| 356 | |
| 357 if (conf.do_queue) { | |
| 358 DEBUG(1) debugf("queuing forced by configuration or option.\n"); | |
| 359 } else { | |
| 360 pid = fork(); | |
| 361 if (pid == 0) { | |
| 362 _exit(deliver(msg)); | |
| 363 } else if (pid < 0) { | |
| 364 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid); | |
| 365 } | |
| 366 } | |
| 367 psc->rcpt_seen = psc->from_seen = FALSE; | |
| 368 destroy_message(msg); | |
| 369 msg = NULL; | |
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370 break; |
| 80 | 371 |
| 372 case SMTP_QUIT: | |
| 373 smtp_printf(out, "221 goodbye\r\n"); | |
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374 destroy_message(msg); |
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375 msg = NULL; |
| 80 | 376 return; |
| 377 | |
| 378 case SMTP_RSET: | |
| 379 psc->from_seen = psc->rcpt_seen = FALSE; | |
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380 destroy_message(msg); |
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381 msg = NULL; |
| 80 | 382 smtp_printf(out, "250 OK\r\n"); |
| 383 break; | |
| 384 | |
| 385 case SMTP_NOOP: | |
| 386 smtp_printf(out, "250 OK\r\n"); | |
| 387 break; | |
| 388 | |
| 389 case SMTP_HELP: | |
| 390 { | |
| 391 int i; | |
| 392 | |
| 393 smtp_printf(out, "214-supported commands:\r\n"); | |
| 394 for (i = 0; i < SMTP_NUM_IDS - 1; i++) { | |
| 395 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd); | |
| 396 } | |
| 397 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd); | |
| 398 } | |
| 399 break; | |
| 400 | |
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401 default: |
| 80 | 402 smtp_printf(out, "501 command not recognized\r\n"); |
| 403 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer); | |
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404 break; |
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405 } |
| 0 | 406 } |
| 80 | 407 switch (len) { |
| 408 case -3: | |
| 409 logwrite(LOG_NOTICE, "connection timed out\n"); | |
| 410 break; | |
| 411 case -2: | |
| 412 logwrite(LOG_NOTICE, "line overflow\n"); | |
| 413 break; | |
| 414 case -1: | |
| 415 logwrite(LOG_NOTICE, "received EOF\n"); | |
| 416 break; | |
| 417 default: | |
| 418 break; | |
| 419 } | |
| 0 | 420 } |
| 421 #endif |