Mercurial > masqmail-0.2
annotate src/smtp_in.c @ 117:5ec5e6637049
added server-side SMTP SIZE support (patch by Paolo)
``SIZE 0'' (= unlimited) is currently not supported
client-side support was already implemented
| author | meillo@marmaro.de |
|---|---|
| date | Thu, 01 Jul 2010 13:08:53 +0200 |
| parents | 71ce3a1568e9 |
| children | cd59a5b4d3dd |
| 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(). |
| 0 | 81 */ |
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82 static gboolean |
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83 get_address(gchar * line, gchar * addr) |
| 0 | 84 { |
| 80 | 85 gchar *p = line; |
| 86 gchar *q = addr; | |
| 0 | 87 |
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88 /* skip MAIL FROM: and RCPT TO: */ |
| 80 | 89 while (*p && (*p != ':')) { |
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90 p++; |
| 80 | 91 } |
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92 p++; |
| 0 | 93 |
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94 /* skip spaces: */ |
| 80 | 95 while (*p && isspace(*p)) { |
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96 p++; |
| 80 | 97 } |
| 0 | 98 |
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99 /* get address: */ |
| 80 | 100 while (*p && !isspace(*p) && (q < addr + MAX_ADDRESS - 1)) { |
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101 *(q++) = *(p++); |
| 80 | 102 } |
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103 *q = 0; |
| 0 | 104 |
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105 return TRUE; |
| 0 | 106 } |
| 107 | |
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108 static smtp_connection* |
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109 create_base(gchar * remote_host) |
| 0 | 110 { |
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111 smtp_connection *base = g_malloc(sizeof(smtp_connection)); |
| 80 | 112 if (!base) { |
| 113 return NULL; | |
| 114 } | |
| 115 | |
| 116 base->remote_host = g_strdup(remote_host); | |
| 0 | 117 |
| 80 | 118 base->prot = PROT_SMTP; |
| 119 base->next_id = 0; | |
| 120 base->helo_seen = 0; | |
| 121 base->from_seen = 0; | |
| 122 base->rcpt_seen = 0; | |
| 123 base->msg = NULL; | |
| 0 | 124 |
| 80 | 125 return base; |
| 0 | 126 } |
| 127 | |
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128 static void |
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129 smtp_printf(FILE * out, gchar * fmt, ...) |
| 0 | 130 { |
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131 va_list args; |
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132 va_start(args, fmt); |
| 0 | 133 |
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134 DEBUG(4) { |
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135 gchar buf[256]; |
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136 va_list args_copy; |
| 0 | 137 |
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138 va_copy(args_copy, args); |
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139 vsnprintf(buf, 255, fmt, args_copy); |
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140 va_end(args_copy); |
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141 |
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142 debugf(">>>%s", buf); |
| 0 | 143 } |
| 144 | |
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145 vfprintf(out, fmt, args); |
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146 fflush(out); |
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147 |
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148 va_end(args); |
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149 } |
| 0 | 150 |
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151 void |
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152 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident) |
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153 { |
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154 gchar *buffer; |
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155 smtp_cmd_id cmd_id; |
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156 message *msg = NULL; |
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157 smtp_connection *psc; |
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158 int len; |
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159 unsigned long size, msize; |
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160 |
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161 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host); |
| 0 | 162 |
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163 psc = create_base(remote_host); |
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164 psc->msg = msg; |
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165 |
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166 buffer = (gchar *) g_malloc(BUF_LEN); |
| 80 | 167 if (!buffer) { |
| 168 /* this check is actually unneccessary as g_malloc() | |
| 169 aborts on failure */ | |
| 170 return; | |
| 171 } | |
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172 |
| 80 | 173 /* send greeting string, containing ESMTP: */ |
| 174 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION); | |
| 0 | 175 |
| 80 | 176 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) { |
| 177 cmd_id = get_id(buffer); | |
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178 |
| 80 | 179 switch (cmd_id) { |
| 180 case SMTP_EHLO: | |
| 181 psc->prot = PROT_ESMTP; | |
| 182 /* fall through */ | |
| 183 case SMTP_HELO: | |
| 184 psc->helo_seen = TRUE; | |
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185 |
| 80 | 186 if (conf.defer_all) { /* I need this to debug delivery failures */ |
| 187 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name); | |
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188 break; |
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189 } |
| 80 | 190 |
| 191 if (psc->prot == PROT_ESMTP) { | |
| 192 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name); | |
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193 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size); |
| 80 | 194 smtp_printf(out, "250-PIPELINING\r\n" "250 HELP\r\n"); |
| 195 } else { | |
| 196 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name); | |
| 197 } | |
| 198 break; | |
| 199 | |
| 200 case SMTP_MAIL_FROM: | |
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201 if (get_size(buffer, &msize)) { |
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202 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n", |
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203 msize, conf.max_msg_size); |
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204 if (msize > conf.max_msg_size) { |
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205 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n"); |
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206 break; |
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207 } |
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208 } |
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209 |
| 80 | 210 { |
| 211 gchar buf[MAX_ADDRESS]; | |
| 212 address *addr; | |
| 213 | |
| 214 if (!psc->helo_seen) { | |
| 215 smtp_printf(out, "503 need HELO or EHLO\r\n"); | |
| 216 break; | |
| 217 } | |
| 218 if (psc->from_seen) { | |
| 219 smtp_printf(out, "503 MAIL FROM: already given.\r\n"); | |
| 220 break; | |
| 221 } | |
| 222 | |
| 223 msg = create_message(); | |
| 224 msg->received_host = remote_host ? g_strdup(remote_host) : NULL; | |
| 225 msg->received_prot = psc->prot; | |
| 226 msg->ident = ident ? g_strdup(ident) : NULL; | |
| 227 /* get transfer id and increment for next one */ | |
| 228 msg->transfer_id = (psc->next_id)++; | |
| 229 | |
| 230 get_address(buffer, buf); | |
| 231 if (remote_host) { | |
| 232 addr = create_address(buf, TRUE); | |
| 233 } else { | |
| 234 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 235 } | |
| 236 if (!addr) { | |
| 237 smtp_printf(out, "501 %s: syntax error.\r\n", buf); | |
| 238 } else if (!addr->domain) { | |
| 239 smtp_printf(out, "501 return path must be qualified.\r\n", buf); | |
| 240 } else { | |
| 241 psc->from_seen = TRUE; | |
| 242 msg->return_path = addr; | |
| 243 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address); | |
| 244 } | |
| 245 } | |
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246 break; |
| 80 | 247 |
| 248 case SMTP_RCPT_TO: | |
| 249 { | |
| 250 char buf[MAX_ADDRESS]; | |
| 251 address *addr; | |
| 252 | |
| 253 if (!psc->helo_seen) { | |
| 254 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 255 break; | |
| 256 } | |
| 257 if (!psc->from_seen) { | |
| 258 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n"); | |
| 259 break; | |
| 260 } | |
| 261 | |
| 262 get_address(buffer, buf); | |
| 263 if (remote_host) { | |
| 264 addr = create_address(buf, TRUE); | |
| 265 } else { | |
| 266 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 267 } | |
| 268 if (!addr) { | |
| 269 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf); | |
| 270 break; | |
| 271 } | |
| 272 if (addr->local_part[0] == '|') { | |
| 273 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf); | |
| 274 break; | |
| 275 } | |
| 276 if (!addr->domain) { | |
| 277 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf); | |
| 278 break; | |
| 279 } | |
| 280 gboolean do_relay = conf.do_relay; | |
| 281 if (!do_relay) { | |
| 282 do_relay = addr_is_local(msg->return_path); | |
| 283 if (!do_relay) { | |
| 284 do_relay = addr_is_local(addr); | |
| 285 } | |
| 286 } | |
| 287 if (!do_relay) { | |
| 288 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr)); | |
| 289 break; | |
| 290 } | |
| 291 psc->rcpt_seen = TRUE; | |
| 292 msg->rcpt_list = g_list_append(msg->rcpt_list, addr); | |
| 293 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address); | |
| 294 } | |
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295 break; |
| 80 | 296 |
| 297 case SMTP_DATA: | |
| 298 if (!psc->helo_seen) { | |
| 299 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 300 break; | |
| 301 } | |
| 302 if (!psc->rcpt_seen) { | |
| 303 smtp_printf(out, "503 need RCPT TO: before DATA\r\n"); | |
| 304 break; | |
| 305 } | |
| 306 accept_error err; | |
| 307 | |
| 308 smtp_printf(out, "354 okay, and do not forget the dot\r\n"); | |
| 309 | |
| 310 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0); | |
| 311 if (err != AERR_OK) { | |
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312 switch (err) { |
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313 case AERR_TIMEOUT: |
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314 case AERR_EOF: |
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315 return; |
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316 case AERR_SIZE: |
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317 smtp_printf(out, "552 Error: message too large.\r\n"); |
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318 return; |
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319 default: |
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320 /* should never happen: */ |
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321 smtp_printf(out, "451 Unknown error\r\n"); |
| 80 | 322 return; |
| 323 } | |
| 324 } | |
| 325 | |
| 326 | |
| 327 if (!spool_write(msg, TRUE)) { | |
| 328 smtp_printf(out, "451 Could not write spool file\r\n"); | |
| 329 return; | |
| 330 } | |
| 331 pid_t pid; | |
| 332 smtp_printf(out, "250 OK id=%s\r\n", msg->uid); | |
| 333 | |
| 334 if (remote_host != NULL) { | |
| 335 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid, | |
| 336 msg->return_path->local_part, msg->return_path->domain, | |
| 337 remote_host, prot_names[psc->prot]); | |
| 338 } else { | |
| 339 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid, | |
| 340 msg->return_path->local_part, msg->return_path->domain, | |
| 341 prot_names[psc->prot]); | |
| 342 } | |
| 343 | |
| 344 if (conf.do_queue) { | |
| 345 DEBUG(1) debugf("queuing forced by configuration or option.\n"); | |
| 346 } else { | |
| 347 pid = fork(); | |
| 348 if (pid == 0) { | |
| 349 _exit(deliver(msg)); | |
| 350 } else if (pid < 0) { | |
| 351 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid); | |
| 352 } | |
| 353 } | |
| 354 psc->rcpt_seen = psc->from_seen = FALSE; | |
| 355 destroy_message(msg); | |
| 356 msg = NULL; | |
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357 break; |
| 80 | 358 |
| 359 case SMTP_QUIT: | |
| 360 smtp_printf(out, "221 goodbye\r\n"); | |
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361 destroy_message(msg); |
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362 msg = NULL; |
| 80 | 363 return; |
| 364 | |
| 365 case SMTP_RSET: | |
| 366 psc->from_seen = psc->rcpt_seen = FALSE; | |
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367 destroy_message(msg); |
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368 msg = NULL; |
| 80 | 369 smtp_printf(out, "250 OK\r\n"); |
| 370 break; | |
| 371 | |
| 372 case SMTP_NOOP: | |
| 373 smtp_printf(out, "250 OK\r\n"); | |
| 374 break; | |
| 375 | |
| 376 case SMTP_HELP: | |
| 377 { | |
| 378 int i; | |
| 379 | |
| 380 smtp_printf(out, "214-supported commands:\r\n"); | |
| 381 for (i = 0; i < SMTP_NUM_IDS - 1; i++) { | |
| 382 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd); | |
| 383 } | |
| 384 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd); | |
| 385 } | |
| 386 break; | |
| 387 | |
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388 default: |
| 80 | 389 smtp_printf(out, "501 command not recognized\r\n"); |
| 390 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer); | |
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391 break; |
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392 } |
| 0 | 393 } |
| 80 | 394 switch (len) { |
| 395 case -3: | |
| 396 logwrite(LOG_NOTICE, "connection timed out\n"); | |
| 397 break; | |
| 398 case -2: | |
| 399 logwrite(LOG_NOTICE, "line overflow\n"); | |
| 400 break; | |
| 401 case -1: | |
| 402 logwrite(LOG_NOTICE, "received EOF\n"); | |
| 403 break; | |
| 404 default: | |
| 405 break; | |
| 406 } | |
| 0 | 407 } |
| 408 #endif |