1 /* $NetBSD: qmgr_deliver.c,v 1.1.1.2 2011/03/02 19:32:23 tron Exp $ */ 2 3 /*++ 4 /* NAME 5 /* qmgr_deliver 3 6 /* SUMMARY 7 /* deliver one per-site queue entry to that site 8 /* SYNOPSIS 9 /* #include "qmgr.h" 10 /* 11 /* int qmgr_deliver_concurrency; 12 /* 13 /* int qmgr_deliver(transport, fp) 14 /* QMGR_TRANSPORT *transport; 15 /* VSTREAM *fp; 16 /* DESCRIPTION 17 /* This module implements the client side of the `queue manager 18 /* to delivery agent' protocol. The queue manager uses 19 /* asynchronous I/O so that it can drive multiple delivery 20 /* agents in parallel. Depending on the outcome of a delivery 21 /* attempt, the status of messages, queues and transports is 22 /* updated. 23 /* 24 /* qmgr_deliver_concurrency is a global counter that says how 25 /* many delivery processes are in use. This can be used, for 26 /* example, to control the size of the `active' message queue. 27 /* 28 /* qmgr_deliver() executes when a delivery process announces its 29 /* availability for the named transport. It arranges for delivery 30 /* of a suitable queue entry. The \fIfp\fR argument specifies a 31 /* stream that is connected to the delivery process, or a null 32 /* pointer if the transport accepts no connection. Upon completion 33 /* of delivery (successful or not), the stream is closed, so that the 34 /* delivery process is released. 35 /* DIAGNOSTICS 36 /* LICENSE 37 /* .ad 38 /* .fi 39 /* The Secure Mailer license must be distributed with this software. 40 /* AUTHOR(S) 41 /* Wietse Venema 42 /* IBM T.J. Watson Research 43 /* P.O. Box 704 44 /* Yorktown Heights, NY 10598, USA 45 /*--*/ 46 47 /* System library. */ 48 49 #include <sys_defs.h> 50 #include <time.h> 51 #include <string.h> 52 53 /* Utility library. */ 54 55 #include <msg.h> 56 #include <vstring.h> 57 #include <vstream.h> 58 #include <vstring_vstream.h> 59 #include <events.h> 60 #include <iostuff.h> 61 #include <stringops.h> 62 #include <mymalloc.h> 63 64 /* Global library. */ 65 66 #include <mail_queue.h> 67 #include <mail_proto.h> 68 #include <recipient_list.h> 69 #include <mail_params.h> 70 #include <deliver_request.h> 71 #include <verp_sender.h> 72 #include <dsn_util.h> 73 #include <dsn_buf.h> 74 #include <dsb_scan.h> 75 #include <rcpt_print.h> 76 77 /* Application-specific. */ 78 79 #include "qmgr.h" 80 81 int qmgr_deliver_concurrency; 82 83 /* 84 * Message delivery status codes. 85 */ 86 #define DELIVER_STAT_OK 0 /* all recipients delivered */ 87 #define DELIVER_STAT_DEFER 1 /* try some recipients later */ 88 #define DELIVER_STAT_CRASH 2 /* mailer internal problem */ 89 90 /* qmgr_deliver_initial_reply - retrieve initial delivery process response */ 91 92 static int qmgr_deliver_initial_reply(VSTREAM *stream) 93 { 94 int stat; 95 96 if (peekfd(vstream_fileno(stream)) < 0) { 97 msg_warn("%s: premature disconnect", VSTREAM_PATH(stream)); 98 return (DELIVER_STAT_CRASH); 99 } else if (attr_scan(stream, ATTR_FLAG_STRICT, 100 ATTR_TYPE_INT, MAIL_ATTR_STATUS, &stat, 101 ATTR_TYPE_END) != 1) { 102 msg_warn("%s: malformed response", VSTREAM_PATH(stream)); 103 return (DELIVER_STAT_CRASH); 104 } else { 105 return (stat ? DELIVER_STAT_DEFER : 0); 106 } 107 } 108 109 /* qmgr_deliver_final_reply - retrieve final delivery process response */ 110 111 static int qmgr_deliver_final_reply(VSTREAM *stream, DSN_BUF *dsb) 112 { 113 int stat; 114 115 if (peekfd(vstream_fileno(stream)) < 0) { 116 msg_warn("%s: premature disconnect", VSTREAM_PATH(stream)); 117 return (DELIVER_STAT_CRASH); 118 } else if (attr_scan(stream, ATTR_FLAG_STRICT, 119 ATTR_TYPE_FUNC, dsb_scan, (void *) dsb, 120 ATTR_TYPE_INT, MAIL_ATTR_STATUS, &stat, 121 ATTR_TYPE_END) != 2) { 122 msg_warn("%s: malformed response", VSTREAM_PATH(stream)); 123 return (DELIVER_STAT_CRASH); 124 } else { 125 return (stat ? DELIVER_STAT_DEFER : 0); 126 } 127 } 128 129 /* qmgr_deliver_send_request - send delivery request to delivery process */ 130 131 static int qmgr_deliver_send_request(QMGR_ENTRY *entry, VSTREAM *stream) 132 { 133 RECIPIENT_LIST list = entry->rcpt_list; 134 RECIPIENT *recipient; 135 QMGR_MESSAGE *message = entry->message; 136 VSTRING *sender_buf = 0; 137 MSG_STATS stats; 138 char *sender; 139 int flags; 140 141 /* 142 * If variable envelope return path is requested, change prefix+@origin 143 * into prefix+user=domain@origin. Note that with VERP there is only one 144 * recipient per delivery. 145 */ 146 if (message->verp_delims == 0) { 147 sender = message->sender; 148 } else { 149 sender_buf = vstring_alloc(100); 150 verp_sender(sender_buf, message->verp_delims, 151 message->sender, list.info); 152 sender = vstring_str(sender_buf); 153 } 154 155 flags = message->tflags 156 | entry->queue->dflags 157 | (message->inspect_xport ? DEL_REQ_FLAG_BOUNCE : DEL_REQ_FLAG_DEFLT); 158 (void) QMGR_MSG_STATS(&stats, message); 159 attr_print(stream, ATTR_FLAG_NONE, 160 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, flags, 161 ATTR_TYPE_STR, MAIL_ATTR_QUEUE, message->queue_name, 162 ATTR_TYPE_STR, MAIL_ATTR_QUEUEID, message->queue_id, 163 ATTR_TYPE_LONG, MAIL_ATTR_OFFSET, message->data_offset, 164 ATTR_TYPE_LONG, MAIL_ATTR_SIZE, message->cont_length, 165 ATTR_TYPE_STR, MAIL_ATTR_NEXTHOP, entry->queue->nexthop, 166 ATTR_TYPE_STR, MAIL_ATTR_ENCODING, message->encoding, 167 ATTR_TYPE_STR, MAIL_ATTR_SENDER, sender, 168 ATTR_TYPE_STR, MAIL_ATTR_DSN_ENVID, message->dsn_envid, 169 ATTR_TYPE_INT, MAIL_ATTR_DSN_RET, message->dsn_ret, 170 ATTR_TYPE_FUNC, msg_stats_print, (void *) &stats, 171 /* XXX Should be encapsulated with ATTR_TYPE_FUNC. */ 172 ATTR_TYPE_STR, MAIL_ATTR_LOG_CLIENT_NAME, message->client_name, 173 ATTR_TYPE_STR, MAIL_ATTR_LOG_CLIENT_ADDR, message->client_addr, 174 ATTR_TYPE_STR, MAIL_ATTR_LOG_CLIENT_PORT, message->client_port, 175 ATTR_TYPE_STR, MAIL_ATTR_LOG_PROTO_NAME, message->client_proto, 176 ATTR_TYPE_STR, MAIL_ATTR_LOG_HELO_NAME, message->client_helo, 177 /* XXX Should be encapsulated with ATTR_TYPE_FUNC. */ 178 ATTR_TYPE_STR, MAIL_ATTR_SASL_METHOD, message->sasl_method, 179 ATTR_TYPE_STR, MAIL_ATTR_SASL_USERNAME, message->sasl_username, 180 ATTR_TYPE_STR, MAIL_ATTR_SASL_SENDER, message->sasl_sender, 181 /* XXX Ditto if we want to pass TLS certificate info. */ 182 ATTR_TYPE_STR, MAIL_ATTR_LOG_IDENT, message->log_ident, 183 ATTR_TYPE_STR, MAIL_ATTR_RWR_CONTEXT, message->rewrite_context, 184 ATTR_TYPE_INT, MAIL_ATTR_RCPT_COUNT, list.len, 185 ATTR_TYPE_END); 186 if (sender_buf != 0) 187 vstring_free(sender_buf); 188 for (recipient = list.info; recipient < list.info + list.len; recipient++) 189 attr_print(stream, ATTR_FLAG_NONE, 190 ATTR_TYPE_FUNC, rcpt_print, (void *) recipient, 191 ATTR_TYPE_END); 192 if (vstream_fflush(stream) != 0) { 193 msg_warn("write to process (%s): %m", entry->queue->transport->name); 194 return (-1); 195 } else { 196 if (msg_verbose) 197 msg_info("qmgr_deliver: site `%s'", entry->queue->name); 198 return (0); 199 } 200 } 201 202 /* qmgr_deliver_abort - transport response watchdog */ 203 204 static void qmgr_deliver_abort(int unused_event, char *context) 205 { 206 QMGR_ENTRY *entry = (QMGR_ENTRY *) context; 207 QMGR_QUEUE *queue = entry->queue; 208 QMGR_TRANSPORT *transport = queue->transport; 209 QMGR_MESSAGE *message = entry->message; 210 211 msg_fatal("%s: timeout receiving delivery status from transport: %s", 212 message->queue_id, transport->name); 213 } 214 215 /* qmgr_deliver_update - process delivery status report */ 216 217 static void qmgr_deliver_update(int unused_event, char *context) 218 { 219 QMGR_ENTRY *entry = (QMGR_ENTRY *) context; 220 QMGR_QUEUE *queue = entry->queue; 221 QMGR_TRANSPORT *transport = queue->transport; 222 QMGR_MESSAGE *message = entry->message; 223 static DSN_BUF *dsb; 224 int status; 225 226 /* 227 * Release the delivery agent from a "hot" queue entry. 228 */ 229 #define QMGR_DELIVER_RELEASE_AGENT(entry) do { \ 230 event_disable_readwrite(vstream_fileno(entry->stream)); \ 231 (void) vstream_fclose(entry->stream); \ 232 entry->stream = 0; \ 233 qmgr_deliver_concurrency--; \ 234 } while (0) 235 236 if (dsb == 0) 237 dsb = dsb_create(); 238 239 /* 240 * The message transport has responded. Stop the watchdog timer. 241 */ 242 event_cancel_timer(qmgr_deliver_abort, context); 243 244 /* 245 * Retrieve the delivery agent status report. The numerical status code 246 * indicates if delivery should be tried again. The reason text is sent 247 * only when a site should be avoided for a while, so that the queue 248 * manager can log why it does not even try to schedule delivery to the 249 * affected recipients. 250 */ 251 status = qmgr_deliver_final_reply(entry->stream, dsb); 252 253 /* 254 * The mail delivery process failed for some reason (although delivery 255 * may have been successful). Back off with this transport type for a 256 * while. Dispose of queue entries for this transport that await 257 * selection (the todo lists). Stay away from queue entries that have 258 * been selected (the busy lists), or we would have dangling pointers. 259 * The queue itself won't go away before we dispose of the current queue 260 * entry. 261 */ 262 if (status == DELIVER_STAT_CRASH) { 263 message->flags |= DELIVER_STAT_DEFER; 264 #if 0 265 whatsup = concatenate("unknown ", transport->name, 266 " mail transport error", (char *) 0); 267 qmgr_transport_throttle(transport, 268 DSN_SIMPLE(&dsb->dsn, "4.3.0", whatsup)); 269 myfree(whatsup); 270 #else 271 qmgr_transport_throttle(transport, 272 DSN_SIMPLE(&dsb->dsn, "4.3.0", 273 "unknown mail transport error")); 274 #endif 275 msg_warn("transport %s failure -- see a previous warning/fatal/panic logfile record for the problem description", 276 transport->name); 277 278 /* 279 * Assume the worst and write a defer logfile record for each 280 * recipient. This omission was already present in the first queue 281 * manager implementation of 199703, and was fixed 200511. 282 * 283 * To avoid the synchronous qmgr_defer_recipient() operation for each 284 * recipient of this queue entry, release the delivery process and 285 * move the entry back to the todo queue. Let qmgr_defer_transport() 286 * log the recipient asynchronously if possible, and get out of here. 287 * Note: if asynchronous logging is not possible, 288 * qmgr_defer_transport() eventually invokes qmgr_entry_done() and 289 * the entry becomes a dangling pointer. 290 */ 291 QMGR_DELIVER_RELEASE_AGENT(entry); 292 qmgr_entry_unselect(queue, entry); 293 qmgr_defer_transport(transport, &dsb->dsn); 294 return; 295 } 296 297 /* 298 * This message must be tried again. 299 * 300 * If we have a problem talking to this site, back off with this site for a 301 * while; dispose of queue entries for this site that await selection 302 * (the todo list); stay away from queue entries that have been selected 303 * (the busy list), or we would have dangling pointers. The queue itself 304 * won't go away before we dispose of the current queue entry. 305 * 306 * XXX Caution: DSN_COPY() will panic on empty status or reason. 307 */ 308 #define SUSPENDED "delivery temporarily suspended: " 309 310 if (status == DELIVER_STAT_DEFER) { 311 message->flags |= DELIVER_STAT_DEFER; 312 if (VSTRING_LEN(dsb->status)) { 313 /* Sanitize the DSN status/reason from the delivery agent. */ 314 if (!dsn_valid(vstring_str(dsb->status))) 315 vstring_strcpy(dsb->status, "4.0.0"); 316 if (VSTRING_LEN(dsb->reason) == 0) 317 vstring_strcpy(dsb->reason, "unknown error"); 318 vstring_prepend(dsb->reason, SUSPENDED, sizeof(SUSPENDED) - 1); 319 if (QMGR_QUEUE_READY(queue)) { 320 qmgr_queue_throttle(queue, DSN_FROM_DSN_BUF(dsb)); 321 if (QMGR_QUEUE_THROTTLED(queue)) 322 qmgr_defer_todo(queue, &dsb->dsn); 323 } 324 } 325 } 326 327 /* 328 * No problems detected. Mark the transport and queue as alive. The queue 329 * itself won't go away before we dispose of the current queue entry. 330 */ 331 if (status != DELIVER_STAT_CRASH && VSTRING_LEN(dsb->reason) == 0) { 332 qmgr_transport_unthrottle(transport); 333 qmgr_queue_unthrottle(queue); 334 } 335 336 /* 337 * Release the delivery process, and give some other queue entry a chance 338 * to be delivered. When all recipients for a message have been tried, 339 * decide what to do next with this message: defer, bounce, delete. 340 */ 341 QMGR_DELIVER_RELEASE_AGENT(entry); 342 qmgr_entry_done(entry, QMGR_QUEUE_BUSY); 343 } 344 345 /* qmgr_deliver - deliver one per-site queue entry */ 346 347 void qmgr_deliver(QMGR_TRANSPORT *transport, VSTREAM *stream) 348 { 349 QMGR_QUEUE *queue; 350 QMGR_ENTRY *entry; 351 DSN dsn; 352 353 /* 354 * Find out if this delivery process is really available. Once elected, 355 * the delivery process is supposed to express its happiness. If there is 356 * a problem, wipe the pending deliveries for this transport. This 357 * routine runs in response to an external event, so it does not run 358 * while some other queue manipulation is happening. 359 */ 360 if (stream == 0 || qmgr_deliver_initial_reply(stream) != 0) { 361 #if 0 362 whatsup = concatenate(transport->name, 363 " mail transport unavailable", (char *) 0); 364 qmgr_transport_throttle(transport, 365 DSN_SIMPLE(&dsn, "4.3.0", whatsup)); 366 myfree(whatsup); 367 #else 368 qmgr_transport_throttle(transport, 369 DSN_SIMPLE(&dsn, "4.3.0", 370 "mail transport unavailable")); 371 #endif 372 qmgr_defer_transport(transport, &dsn); 373 if (stream) 374 (void) vstream_fclose(stream); 375 return; 376 } 377 378 /* 379 * Find a suitable queue entry. Things may have changed since this 380 * transport was allocated. If no suitable entry is found, 381 * unceremoniously disconnect from the delivery process. The delivery 382 * agent request reading routine is prepared for the queue manager to 383 * change its mind for no apparent reason. 384 */ 385 if ((queue = qmgr_queue_select(transport)) == 0 386 || (entry = qmgr_entry_select(queue)) == 0) { 387 (void) vstream_fclose(stream); 388 return; 389 } 390 391 /* 392 * Send the queue file info and recipient info to the delivery process. 393 * If there is a problem, wipe the pending deliveries for this transport. 394 * This routine runs in response to an external event, so it does not run 395 * while some other queue manipulation is happening. 396 */ 397 if (qmgr_deliver_send_request(entry, stream) < 0) { 398 qmgr_entry_unselect(queue, entry); 399 #if 0 400 whatsup = concatenate(transport->name, 401 " mail transport unavailable", (char *) 0); 402 qmgr_transport_throttle(transport, 403 DSN_SIMPLE(&dsn, "4.3.0", whatsup)); 404 myfree(whatsup); 405 #else 406 qmgr_transport_throttle(transport, 407 DSN_SIMPLE(&dsn, "4.3.0", 408 "mail transport unavailable")); 409 #endif 410 qmgr_defer_transport(transport, &dsn); 411 /* warning: entry and queue may be dangling pointers here */ 412 (void) vstream_fclose(stream); 413 return; 414 } 415 416 /* 417 * If we get this far, go wait for the delivery status report. 418 */ 419 qmgr_deliver_concurrency++; 420 entry->stream = stream; 421 event_enable_read(vstream_fileno(stream), 422 qmgr_deliver_update, (char *) entry); 423 424 /* 425 * Guard against broken systems. 426 */ 427 event_request_timer(qmgr_deliver_abort, (char *) entry, var_daemon_timeout); 428 } 429