masqmail-0.2: 24872a9fe6e1 src/smtp

masqmail-0.2

view src/smtp_in.c @ 11:24872a9fe6e1

merged

author	meillo@marmaro.de
date	Mon, 27 Oct 2008 16:23:31 +0100
parents	08114f7dcc23
children	f671821d8222

line source

1 /* MasqMail

4 This program is free software; you can redistribute it and/or modify

5 it under the terms of the GNU General Public License as published by

6 the Free Software Foundation; either version 2 of the License, or

7 (at your option) any later version.

9 This program is distributed in the hope that it will be useful,

10 but WITHOUT ANY WARRANTY; without even the implied warranty of

11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

12 GNU General Public License for more details.

14 You should have received a copy of the GNU General Public License

15 along with this program; if not, write to the Free Software

16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

17 */

19 #include "masqmail.h"

20 #include "readsock.h"

22 /*

23 I always forget these rfc numbers:

24 RFC 821 (SMTP)

25 RFC 1869 (ESMTP)

26 RFC 1870 (ESMTP SIZE)

27 RFC 2197 (ESMTP PIPELINE)

28 RFC 2554 (ESMTP AUTH)

29 */

31 #ifdef ENABLE_SMTP_SERVER

33 smtp_cmd smtp_cmds[] = {

34 {SMTP_HELO, "HELO",}

35 ,

36 {SMTP_EHLO, "EHLO",}

37 ,

38 {SMTP_MAIL_FROM, "MAIL FROM:",}

39 ,

40 {SMTP_RCPT_TO, "RCPT TO:",}

41 ,

42 {SMTP_DATA, "DATA",}

43 ,

44 {SMTP_QUIT, "QUIT",}

45 ,

46 {SMTP_RSET, "RSET",}

47 ,

48 {SMTP_NOOP, "NOOP",}

49 ,

50 {SMTP_HELP, "HELP"}

51 ,

52 };

54 static smtp_cmd_id

55 get_id(const gchar * line)

56 {

57 gint i;

58 for (i = 0; i < SMTP_NUM_IDS; i++) {

59 if (strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0)

60 return (smtp_cmd_id) i;

61 }

62 return SMTP_ERROR;

63 }

65 /* this is a quick hack: we expect the address to be syntactically correct

66 and containing the mailbox only:

67 */

69 static gboolean

70 get_address(gchar * line, gchar * addr)

71 {

72 gchar *p = line, *q = addr;

74 /* skip MAIL FROM: and RCPT TO: */

75 while (*p && (*p != ':'))

76 p++;

77 p++;

79 /* skip spaces: */

80 while (*p && isspace(*p))

81 p++;

83 /* get address: */

84 while (*p && !isspace(*p) && (q < addr + MAX_ADDRESS - 1))

85 *(q++) = *(p++);

86 *q = 0;

88 return TRUE;

89 }

91 static smtp_connection*

92 create_base(gchar * remote_host)

93 {

94 smtp_connection *base = g_malloc(sizeof(smtp_connection));

95 if (base) {

96 base->remote_host = g_strdup(remote_host);

98 base->prot = PROT_SMTP;

99 base->next_id = 0;

100 base->helo_seen = 0;

101 base->from_seen = 0;

102 base->rcpt_seen = 0;

103 base->msg = NULL;

104

105 return base;

106 }

107 return NULL;

108 }

109

110 static void

111 smtp_printf(FILE * out, gchar * fmt, ...)

112 {

113 va_list args;

114 va_start(args, fmt);

115

116 DEBUG(4) {

117 gchar buf[256];

118 va_list args_copy;

119

120 va_copy(args_copy, args);

121 vsnprintf(buf, 255, fmt, args_copy);

122 va_end(args_copy);

123

124 debugf(">>>%s", buf);

125 }

126

127 vfprintf(out, fmt, args);

128 fflush(out);

129

130 va_end(args);

131 }

132

133 void

134 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident)

135 {

136 gchar *buffer;

137 smtp_cmd_id cmd_id;

138 message *msg = NULL;

139 smtp_connection *psc;

140 int len;

141

142 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);

143

144 psc = create_base(remote_host);

145 psc->msg = msg;

146

147 buffer = (gchar *) g_malloc(BUF_LEN);

148 if (buffer) {

149 /* send greeting string, containing ESMTP: */

150 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION);

151

152 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) {

153 cmd_id = get_id(buffer);

154

155 switch (cmd_id) {

156 case SMTP_EHLO:

157 psc->prot = PROT_ESMTP;

158 /* fall through */

159 case SMTP_HELO:

160 psc->helo_seen = TRUE;

161

162 if (!conf.defer_all) { /* I need this to debug delivery failures */

163 if (psc->prot == PROT_ESMTP) {

164 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);

165 /* not yet: fprintf(out, "250-SIZE\r\n"); */

166 smtp_printf(out, "250-PIPELINING\r\n" "250 HELP\r\n");

167 } else {

168 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);

169 }

170 break;

171 } else {

172 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);

173 }

174

175 case SMTP_MAIL_FROM:

176 if (psc->helo_seen && !psc->from_seen) {

177 gchar buf[MAX_ADDRESS];

178 address *addr;

179

180 msg = create_message();

181 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;

182 msg->received_prot = psc->prot;

183 msg->ident = ident ? g_strdup(ident) : NULL;

184 /* get transfer id and increment for next one */

185 msg->transfer_id = (psc->next_id)++;

186

187 get_address(buffer, buf);

188 if ((addr = remote_host

189 ? create_address(buf, TRUE)

190 : create_address_qualified(buf, TRUE, conf.host_name))) {

191 if (addr->domain != NULL) {

192 psc->from_seen = TRUE;

193 msg->return_path = addr;

194 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);

195 } else {

196 smtp_printf(out, "501 return path must be qualified.\r\n", buf);

197 }

198 } else {

199 smtp_printf(out, "501 %s: syntax error.\r\n", buf);

200 }

201 } else {

202 if (!psc->helo_seen)

203 smtp_printf(out, "503 need HELO or EHLO\r\n");

204 else

205 smtp_printf(out, "503 MAIL FROM: already given.\r\n");

206 }

207 break;

208

209 case SMTP_RCPT_TO:

210

211 if (psc->helo_seen && psc->from_seen) {

212 char buf[MAX_ADDRESS];

213 address *addr;

214

215 get_address(buffer, buf);

216 if ((addr = remote_host

217 ? create_address(buf, TRUE)

218 : create_address_qualified(buf, TRUE, conf.host_name))) {

219 if (addr->local_part[0] != '|') {

220 if (addr->domain != NULL) {

221 gboolean do_relay = conf.do_relay;

222 if (!do_relay) {

223 if ((do_relay = addr_is_local(msg->return_path))) {

224 }

225 if (!do_relay) {

226 do_relay = addr_is_local(addr);

227 }

228 }

229 if (do_relay) {

230 psc->rcpt_seen = TRUE;

231 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);

232 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);

233 } else {

234 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));

235 }

236 } else {

237 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);

238 }

239 } else

240 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);

241 } else {

242 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);

243 }

244 } else {

245

246 if (!psc->helo_seen)

247 smtp_printf(out, "503 need HELO or EHLO.\r\n");

248 else

249 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");

250 }

251 break;

252

253 case SMTP_DATA:

254 if (psc->helo_seen && psc->rcpt_seen) {

255 accept_error err;

256

257 smtp_printf(out, "354 okay, and do not forget the dot\r\n");

258

259 if ((err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0)) == AERR_OK) {

260 if (spool_write(msg, TRUE)) {

261 pid_t pid;

262 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);

263

264 if (remote_host != NULL)

265 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid, msg->return_path->local_part,

266 msg->return_path->domain, remote_host, prot_names[psc->prot]);

267 else

268 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid, msg->return_path->local_part,

269 msg->return_path->domain, prot_names[psc->prot]);

270

271 if (!conf.do_queue) {

272 if ((pid = fork()) == 0) {

273

274 if (deliver(msg))

275 _exit(EXIT_SUCCESS);

276 else

277 _exit(EXIT_FAILURE);

278

279 } else if (pid < 0) {

280 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid);

281 }

282 } else {

283 DEBUG(1) debugf("queuing forced by configuration or option.\n");

284 }

285 } else {

286 smtp_printf(out, "451 Could not write spool file\r\n");

287 return;

288 }

289 } else {

290 switch (err) {

291 case AERR_TIMEOUT:

292 return;

293 case AERR_EOF:

294 return;

295 default:

296 /* should never happen: */

297 smtp_printf(out, "451 Unknown error\r\n");

298 return;

299 }

300 }

301 psc->rcpt_seen = psc->from_seen = FALSE;

302 destroy_message(msg);

303 msg = NULL;

304 } else {

305 if (!psc->helo_seen)

306 smtp_printf(out, "503 need HELO or EHLO.\r\n");

307 else

308 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");

309 }

310 break;

311 case SMTP_QUIT:

312 smtp_printf(out, "221 goodbye\r\n");

313 if (msg != NULL)

314 destroy_message(msg);

315 return;

316 case SMTP_RSET:

317 psc->from_seen = psc->rcpt_seen = FALSE;

318 if (msg != NULL)

319 destroy_message(msg);

320 msg = NULL;

321 smtp_printf(out, "250 OK\r\n");

322 break;

323 case SMTP_NOOP:

324 smtp_printf(out, "250 OK\r\n");

325 break;

326 case SMTP_HELP:

327 {

328 int i;

329

330 smtp_printf(out, "214-supported commands:\r\n");

331 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {

332 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);

333 }

334 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);

335 }

336 break;

337 default:

338 smtp_printf(out, "501 command not recognized\r\n");

339 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);

340 break;

341 }

342 }

343 switch (len) {

344 case -3:

345 logwrite(LOG_NOTICE, "connection timed out\n");

346 break;

347 case -2:

348 logwrite(LOG_NOTICE, "line overflow\n");

349 break;

350 case -1:

351 logwrite(LOG_NOTICE, "received EOF\n");

352 break;

353 default:

354 break;

355 }

356 }

357 }

358 #endif