Mercurial > masqmail
annotate src/smtp_in.c @ 371:f122535c589e
Refactoring: early failure exit.
| author | markus schnalke <meillo@marmaro.de> |
|---|---|
| date | Tue, 25 Oct 2011 13:51:43 +0200 |
| parents | b27f66555ba8 |
| children | 028bc124d744 |
| rev | line source |
|---|---|
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1 /* |
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2 ** MasqMail |
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3 ** Copyright (C) 1999-2001 Oliver Kurth |
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4 ** Copyright (C) 2010 markus schnalke <meillo@marmaro.de> |
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5 ** |
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6 ** This program is free software; you can redistribute it and/or modify |
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7 ** it under the terms of the GNU General Public License as published by |
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8 ** the Free Software Foundation; either version 2 of the License, or |
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9 ** (at your option) any later version. |
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10 ** |
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11 ** This program is distributed in the hope that it will be useful, |
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12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 ** GNU General Public License for more details. |
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15 ** |
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16 ** You should have received a copy of the GNU General Public License |
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17 ** along with this program; if not, write to the Free Software |
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18 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 0 | 19 */ |
| 20 | |
| 21 #include "masqmail.h" | |
| 22 #include "readsock.h" | |
| 23 | |
| 24 /* | |
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25 ** I always forget these rfc numbers: |
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26 ** RFC 821 (SMTP) |
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27 ** RFC 1869 (ESMTP) |
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28 ** RFC 1870 (ESMTP SIZE) |
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29 ** RFC 2197 (ESMTP PIPELINE) |
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30 ** RFC 2554 (ESMTP AUTH) |
| 0 | 31 */ |
| 32 | |
| 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 |
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78 /* |
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79 ** this is a quick hack: we expect the address to be syntactically correct |
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80 ** and containing the mailbox only, though we first check for size in |
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81 ** smtp_in(). |
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82 ** Return false if address is too long. |
| 0 | 83 */ |
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84 static gboolean |
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85 get_address(gchar *line, gchar *addr) |
| 0 | 86 { |
| 80 | 87 gchar *p = line; |
| 88 gchar *q = addr; | |
| 0 | 89 |
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90 /* skip MAIL FROM: and RCPT TO: */ |
| 80 | 91 while (*p && (*p != ':')) { |
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92 p++; |
| 80 | 93 } |
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94 p++; |
| 0 | 95 |
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96 /* skip spaces: */ |
| 80 | 97 while (*p && isspace(*p)) { |
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98 p++; |
| 80 | 99 } |
| 0 | 100 |
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101 /* get address: */ |
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102 while (*p && !isspace(*p)) { |
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103 if (q >= addr + MAX_ADDRESS-1) { |
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104 *q = '\0'; |
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105 return FALSE; |
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106 } |
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107 *(q++) = *(p++); |
| 80 | 108 } |
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109 *q = '\0'; |
| 0 | 110 |
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111 return TRUE; |
| 0 | 112 } |
| 113 | |
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114 static smtp_connection* |
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115 create_base(gchar *remote_host) |
| 0 | 116 { |
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117 smtp_connection *base = g_malloc(sizeof(smtp_connection)); |
| 80 | 118 if (!base) { |
| 119 return NULL; | |
| 120 } | |
| 121 | |
| 122 base->remote_host = g_strdup(remote_host); | |
| 0 | 123 |
| 80 | 124 base->prot = PROT_SMTP; |
| 125 base->next_id = 0; | |
| 126 base->helo_seen = 0; | |
| 127 base->from_seen = 0; | |
| 128 base->rcpt_seen = 0; | |
| 129 base->msg = NULL; | |
| 0 | 130 |
| 80 | 131 return base; |
| 0 | 132 } |
| 133 | |
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134 static void |
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135 smtp_printf(FILE *out, gchar *fmt, ...) |
| 0 | 136 { |
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137 va_list args; |
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138 va_start(args, fmt); |
| 0 | 139 |
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140 DEBUG(4) { |
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141 gchar buf[256]; |
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142 va_list args_copy; |
| 0 | 143 |
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144 va_copy(args_copy, args); |
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145 vsnprintf(buf, 255, fmt, args_copy); |
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146 va_end(args_copy); |
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147 |
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148 debugf(">>>%s\n", buf); |
| 0 | 149 } |
| 150 | |
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151 vfprintf(out, fmt, args); |
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152 fflush(out); |
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153 |
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154 va_end(args); |
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155 } |
| 0 | 156 |
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157 void |
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158 smtp_in(FILE *in, FILE *out, gchar *remote_host, gchar *ident) |
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159 { |
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160 gchar *buffer; |
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161 smtp_cmd_id cmd_id; |
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162 message *msg = NULL; |
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163 smtp_connection *psc; |
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164 int len; |
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165 unsigned long size, msize; |
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166 |
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167 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host); |
| 0 | 168 |
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169 psc = create_base(remote_host); |
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170 psc->msg = msg; |
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171 |
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172 buffer = (gchar *) g_malloc(BUF_LEN); |
| 80 | 173 if (!buffer) { |
| 174 /* this check is actually unneccessary as g_malloc() | |
| 175 aborts on failure */ | |
| 176 return; | |
| 177 } | |
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178 |
| 80 | 179 /* send greeting string, containing ESMTP: */ |
| 180 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION); | |
| 0 | 181 |
| 80 | 182 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) { |
| 183 cmd_id = get_id(buffer); | |
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184 |
| 135 | 185 if (conf.defer_all) { |
| 186 /* I need this to debug delivery failures */ | |
| 127 | 187 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name); |
| 135 | 188 destroy_message(msg); |
| 189 msg = NULL; | |
| 190 return; | |
| 127 | 191 } |
| 192 | |
| 80 | 193 switch (cmd_id) { |
| 127 | 194 case SMTP_HELO: |
| 195 psc->prot = PROT_SMTP; | |
| 196 psc->helo_seen = TRUE; | |
| 197 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name); | |
| 198 break; | |
| 199 | |
| 80 | 200 case SMTP_EHLO: |
| 201 psc->prot = PROT_ESMTP; | |
| 202 psc->helo_seen = TRUE; | |
| 127 | 203 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name); |
| 204 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size); | |
| 205 smtp_printf(out, "250-PIPELINING\r\n"); | |
| 206 smtp_printf(out, "250 HELP\r\n"); | |
| 80 | 207 break; |
| 208 | |
| 209 case SMTP_MAIL_FROM: | |
| 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 } | |
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222 if (get_size(buffer, &msize)) { |
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223 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n", |
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224 msize, conf.max_msg_size); |
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225 if (conf.max_msg_size && (msize > conf.max_msg_size)) { |
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226 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n"); |
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227 break; |
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228 } |
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229 } |
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230 if (!get_address(buffer, buf)) { |
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231 smtp_printf(out, "553 Address too long.\r\n"); |
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232 break; |
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233 } |
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234 |
| 80 | 235 msg = create_message(); |
| 236 msg->received_host = remote_host ? g_strdup(remote_host) : NULL; | |
| 237 msg->received_prot = psc->prot; | |
| 238 msg->ident = ident ? g_strdup(ident) : NULL; | |
| 239 /* get transfer id and increment for next one */ | |
| 240 msg->transfer_id = (psc->next_id)++; | |
| 241 | |
| 242 if (remote_host) { | |
| 243 addr = create_address(buf, TRUE); | |
| 244 } else { | |
| 245 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 246 } | |
| 247 if (!addr) { | |
| 248 smtp_printf(out, "501 %s: syntax error.\r\n", buf); | |
| 249 } else if (!addr->domain) { | |
| 250 smtp_printf(out, "501 return path must be qualified.\r\n", buf); | |
| 251 } else { | |
| 252 psc->from_seen = TRUE; | |
| 253 msg->return_path = addr; | |
| 254 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address); | |
| 255 } | |
| 256 } | |
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257 break; |
| 80 | 258 |
| 259 case SMTP_RCPT_TO: | |
| 260 { | |
| 261 char buf[MAX_ADDRESS]; | |
| 262 address *addr; | |
| 263 | |
| 264 if (!psc->helo_seen) { | |
| 265 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 266 break; | |
| 267 } | |
| 268 if (!psc->from_seen) { | |
| 269 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n"); | |
| 270 break; | |
| 271 } | |
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272 if (!get_address(buffer, buf)) { |
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273 smtp_printf(out, "553 Address too long.\r\n"); |
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274 break; |
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275 } |
| 80 | 276 |
| 277 if (remote_host) { | |
| 278 addr = create_address(buf, TRUE); | |
| 279 } else { | |
| 280 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 281 } | |
| 282 if (!addr) { | |
| 283 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf); | |
| 284 break; | |
| 285 } | |
| 286 if (addr->local_part[0] == '|') { | |
| 287 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf); | |
| 288 break; | |
| 289 } | |
| 290 if (!addr->domain) { | |
| 305 | 291 /* TODO: ``postmaster'' may be unqualified */ |
| 80 | 292 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf); |
| 293 break; | |
| 294 } | |
| 305 | 295 if (!(conf.do_relay || addr_is_local(msg->return_path) || addr_is_local(addr))) { |
| 80 | 296 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr)); |
| 297 break; | |
| 298 } | |
| 299 psc->rcpt_seen = TRUE; | |
| 300 msg->rcpt_list = g_list_append(msg->rcpt_list, addr); | |
| 301 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address); | |
| 302 } | |
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303 break; |
| 80 | 304 |
| 305 case SMTP_DATA: | |
| 306 if (!psc->helo_seen) { | |
| 307 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 308 break; | |
| 309 } | |
| 310 if (!psc->rcpt_seen) { | |
| 311 smtp_printf(out, "503 need RCPT TO: before DATA\r\n"); | |
| 312 break; | |
| 313 } | |
| 314 accept_error err; | |
| 315 | |
| 316 smtp_printf(out, "354 okay, and do not forget the dot\r\n"); | |
| 317 | |
| 318 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0); | |
| 319 if (err != AERR_OK) { | |
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320 switch (err) { |
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321 case AERR_TIMEOUT: |
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322 case AERR_EOF: |
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323 return; |
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324 case AERR_SIZE: |
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325 smtp_printf(out, "552 Error: message too large.\r\n"); |
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326 return; |
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327 default: |
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328 /* should never happen: */ |
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329 smtp_printf(out, "451 Unknown error\r\n"); |
| 80 | 330 return; |
| 331 } | |
| 332 } | |
| 333 | |
| 334 | |
| 335 if (!spool_write(msg, TRUE)) { | |
| 336 smtp_printf(out, "451 Could not write spool file\r\n"); | |
| 337 return; | |
| 338 } | |
| 339 pid_t pid; | |
| 340 smtp_printf(out, "250 OK id=%s\r\n", msg->uid); | |
| 341 | |
| 342 if (remote_host != NULL) { | |
| 343 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid, | |
| 344 msg->return_path->local_part, msg->return_path->domain, | |
| 345 remote_host, prot_names[psc->prot]); | |
| 346 } else { | |
| 347 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid, | |
| 348 msg->return_path->local_part, msg->return_path->domain, | |
| 349 prot_names[psc->prot]); | |
| 350 } | |
| 351 | |
| 352 if (conf.do_queue) { | |
| 353 DEBUG(1) debugf("queuing forced by configuration or option.\n"); | |
| 354 } else { | |
| 355 pid = fork(); | |
| 347 | 356 if (pid < 0) { |
| 357 logwrite(LOG_ALERT, "could not fork for delivery, id = %s\n", msg->uid); | |
| 358 } else if (pid == 0) { | |
| 359 /* FIXME: most likely inverted exit code */ | |
| 80 | 360 _exit(deliver(msg)); |
| 361 } | |
| 362 } | |
| 363 psc->rcpt_seen = psc->from_seen = FALSE; | |
| 364 destroy_message(msg); | |
| 365 msg = NULL; | |
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366 break; |
| 80 | 367 |
| 368 case SMTP_QUIT: | |
| 369 smtp_printf(out, "221 goodbye\r\n"); | |
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370 destroy_message(msg); |
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371 msg = NULL; |
| 80 | 372 return; |
| 373 | |
| 374 case SMTP_RSET: | |
| 375 psc->from_seen = psc->rcpt_seen = FALSE; | |
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376 destroy_message(msg); |
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377 msg = NULL; |
| 80 | 378 smtp_printf(out, "250 OK\r\n"); |
| 379 break; | |
| 380 | |
| 381 case SMTP_NOOP: | |
| 382 smtp_printf(out, "250 OK\r\n"); | |
| 383 break; | |
| 384 | |
| 385 case SMTP_HELP: | |
| 386 { | |
| 387 int i; | |
| 388 | |
| 389 smtp_printf(out, "214-supported commands:\r\n"); | |
| 390 for (i = 0; i < SMTP_NUM_IDS - 1; i++) { | |
| 391 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd); | |
| 392 } | |
| 393 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd); | |
| 394 } | |
| 395 break; | |
| 396 | |
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397 default: |
| 80 | 398 smtp_printf(out, "501 command not recognized\r\n"); |
| 399 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer); | |
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400 break; |
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401 } |
| 0 | 402 } |
| 80 | 403 switch (len) { |
| 404 case -3: | |
| 405 logwrite(LOG_NOTICE, "connection timed out\n"); | |
| 406 break; | |
| 407 case -2: | |
| 408 logwrite(LOG_NOTICE, "line overflow\n"); | |
| 409 break; | |
| 410 case -1: | |
| 411 logwrite(LOG_NOTICE, "received EOF\n"); | |
| 412 break; | |
| 413 default: | |
| 414 break; | |
| 415 } | |
| 0 | 416 } |