1 /* $NetBSD: forward.c,v 1.2 2017/02/14 01:16:45 christos Exp $ */ 2 3 /*++ 4 /* NAME 5 /* forward 3 6 /* SUMMARY 7 /* message forwarding 8 /* SYNOPSIS 9 /* #include "local.h" 10 /* 11 /* int forward_init() 12 /* 13 /* int forward_append(attr) 14 /* DELIVER_ATTR attr; 15 /* 16 /* int forward_finish(request, attr, cancel) 17 /* DELIVER_REQUEST *request; 18 /* DELIVER_ATTR attr; 19 /* int cancel; 20 /* DESCRIPTION 21 /* This module implements the client interface for message 22 /* forwarding. 23 /* 24 /* forward_init() initializes internal data structures. 25 /* 26 /* forward_append() appends a recipient to the list of recipients 27 /* that will receive a message with the specified message sender 28 /* and delivered-to addresses. 29 /* 30 /* forward_finish() forwards the actual message contents and 31 /* releases the memory allocated by forward_init() and by 32 /* forward_append(). When the \fIcancel\fR argument is true, no 33 /* messages will be forwarded. The \fIattr\fR argument specifies 34 /* the original message delivery attributes as they were before 35 /* alias or forward expansions. 36 /* DIAGNOSTICS 37 /* A non-zero result means that the requested operation should 38 /* be tried again. 39 /* Warnings: problems connecting to the forwarding service, 40 /* corrupt message file. A corrupt message is saved to the 41 /* "corrupt" queue for further inspection. 42 /* Fatal: out of memory. 43 /* Panic: missing forward_init() or forward_finish() call. 44 /* LICENSE 45 /* .ad 46 /* .fi 47 /* The Secure Mailer license must be distributed with this software. 48 /* AUTHOR(S) 49 /* Wietse Venema 50 /* IBM T.J. Watson Research 51 /* P.O. Box 704 52 /* Yorktown Heights, NY 10598, USA 53 /*--*/ 54 55 /* System library. */ 56 57 #include <sys_defs.h> 58 #include <sys/time.h> 59 #include <unistd.h> 60 61 /* Utility library. */ 62 63 #include <msg.h> 64 #include <mymalloc.h> 65 #include <htable.h> 66 #include <argv.h> 67 #include <vstring.h> 68 #include <vstream.h> 69 #include <vstring_vstream.h> 70 #include <iostuff.h> 71 #include <stringops.h> 72 73 /* Global library. */ 74 75 #include <mail_proto.h> 76 #include <cleanup_user.h> 77 #include <sent.h> 78 #include <record.h> 79 #include <rec_type.h> 80 #include <mark_corrupt.h> 81 #include <mail_date.h> 82 #include <mail_params.h> 83 #include <dsn_mask.h> 84 #include <smtputf8.h> 85 86 /* Application-specific. */ 87 88 #include "local.h" 89 90 /* 91 * Use one cleanup service connection for each (delivered to, sender) pair. 92 */ 93 static HTABLE *forward_dt; 94 95 typedef struct FORWARD_INFO { 96 VSTREAM *cleanup; /* clean up service handle */ 97 char *queue_id; /* forwarded message queue id */ 98 struct timeval posting_time; /* posting time */ 99 } FORWARD_INFO; 100 101 /* forward_init - prepare for forwarding */ 102 103 int forward_init(void) 104 { 105 106 /* 107 * Sanity checks. 108 */ 109 if (forward_dt != 0) 110 msg_panic("forward_init: missing forward_finish call"); 111 112 forward_dt = htable_create(0); 113 return (0); 114 } 115 116 /* forward_open - open connection to cleanup service */ 117 118 static FORWARD_INFO *forward_open(DELIVER_REQUEST *request, const char *sender) 119 { 120 VSTRING *buffer = vstring_alloc(100); 121 FORWARD_INFO *info; 122 VSTREAM *cleanup; 123 124 #define FORWARD_OPEN_RETURN(res) do { \ 125 vstring_free(buffer); \ 126 return (res); \ 127 } while (0) 128 129 /* 130 * Contact the cleanup service and save the new mail queue id. Request 131 * that the cleanup service bounces bad messages to the sender so that we 132 * can avoid the trouble of bounce management. 133 * 134 * In case you wonder what kind of bounces, examples are "too many hops", 135 * "message too large", perhaps some others. The reason not to bounce 136 * ourselves is that we don't really know who the recipients are. 137 */ 138 cleanup = mail_connect(MAIL_CLASS_PUBLIC, var_cleanup_service, BLOCKING); 139 if (cleanup == 0) { 140 msg_warn("connect to %s/%s: %m", 141 MAIL_CLASS_PUBLIC, var_cleanup_service); 142 FORWARD_OPEN_RETURN(0); 143 } 144 close_on_exec(vstream_fileno(cleanup), CLOSE_ON_EXEC); 145 if (attr_scan(cleanup, ATTR_FLAG_STRICT, 146 RECV_ATTR_STR(MAIL_ATTR_QUEUEID, buffer), 147 ATTR_TYPE_END) != 1) { 148 vstream_fclose(cleanup); 149 FORWARD_OPEN_RETURN(0); 150 } 151 info = (FORWARD_INFO *) mymalloc(sizeof(FORWARD_INFO)); 152 info->cleanup = cleanup; 153 info->queue_id = mystrdup(STR(buffer)); 154 GETTIMEOFDAY(&info->posting_time); 155 156 #define FORWARD_CLEANUP_FLAGS \ 157 (CLEANUP_FLAG_BOUNCE | CLEANUP_FLAG_MASK_INTERNAL \ 158 | smtputf8_autodetect(MAIL_SRC_MASK_FORWARD) \ 159 | ((request->smtputf8 & SMTPUTF8_FLAG_REQUESTED) ? \ 160 CLEANUP_FLAG_SMTPUTF8 : 0)) 161 162 attr_print(cleanup, ATTR_FLAG_NONE, 163 SEND_ATTR_INT(MAIL_ATTR_FLAGS, FORWARD_CLEANUP_FLAGS), 164 ATTR_TYPE_END); 165 166 /* 167 * Send initial message envelope information. For bounces, set the 168 * designated sender: mailing list owner, posting user, whatever. 169 */ 170 rec_fprintf(cleanup, REC_TYPE_TIME, REC_TYPE_TIME_FORMAT, 171 REC_TYPE_TIME_ARG(info->posting_time)); 172 rec_fputs(cleanup, REC_TYPE_FROM, sender); 173 174 /* 175 * Don't send the original envelope ID or full/headers return mask if it 176 * was reset due to mailing list expansion. 177 */ 178 if (request->dsn_ret) 179 rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%d", 180 MAIL_ATTR_DSN_RET, request->dsn_ret); 181 if (request->dsn_envid && *(request->dsn_envid)) 182 rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%s", 183 MAIL_ATTR_DSN_ENVID, request->dsn_envid); 184 185 /* 186 * Zero-length attribute values are place holders for unavailable 187 * attribute values. See qmgr_message.c. They are not meant to be 188 * propagated to queue files. 189 */ 190 #define PASS_ATTR(fp, name, value) do { \ 191 if ((value) && *(value)) \ 192 rec_fprintf((fp), REC_TYPE_ATTR, "%s=%s", (name), (value)); \ 193 } while (0) 194 195 /* 196 * XXX encapsulate these as one object. 197 */ 198 PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_NAME, request->client_name); 199 PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_ADDR, request->client_addr); 200 PASS_ATTR(cleanup, MAIL_ATTR_LOG_PROTO_NAME, request->client_proto); 201 PASS_ATTR(cleanup, MAIL_ATTR_LOG_HELO_NAME, request->client_helo); 202 PASS_ATTR(cleanup, MAIL_ATTR_SASL_METHOD, request->sasl_method); 203 PASS_ATTR(cleanup, MAIL_ATTR_SASL_USERNAME, request->sasl_username); 204 PASS_ATTR(cleanup, MAIL_ATTR_SASL_SENDER, request->sasl_sender); 205 PASS_ATTR(cleanup, MAIL_ATTR_LOG_IDENT, request->log_ident); 206 PASS_ATTR(cleanup, MAIL_ATTR_RWR_CONTEXT, request->rewrite_context); 207 208 FORWARD_OPEN_RETURN(info); 209 } 210 211 /* forward_append - append recipient to message envelope */ 212 213 int forward_append(DELIVER_ATTR attr) 214 { 215 FORWARD_INFO *info; 216 HTABLE *table_snd; 217 218 /* 219 * Sanity checks. 220 */ 221 if (msg_verbose) 222 msg_info("forward delivered=%s sender=%s recip=%s", 223 attr.delivered, attr.sender, attr.rcpt.address); 224 if (forward_dt == 0) 225 msg_panic("forward_append: missing forward_init call"); 226 227 /* 228 * In order to find the recipient list, first index a table by 229 * delivered-to header address, then by envelope sender address. 230 */ 231 if ((table_snd = (HTABLE *) htable_find(forward_dt, attr.delivered)) == 0) { 232 table_snd = htable_create(0); 233 htable_enter(forward_dt, attr.delivered, (void *) table_snd); 234 } 235 if ((info = (FORWARD_INFO *) htable_find(table_snd, attr.sender)) == 0) { 236 if ((info = forward_open(attr.request, attr.sender)) == 0) 237 return (-1); 238 htable_enter(table_snd, attr.sender, (void *) info); 239 } 240 241 /* 242 * Append the recipient to the message envelope. Don't send the original 243 * recipient or notification mask if it was reset due to mailing list 244 * expansion. 245 */ 246 if (*attr.rcpt.dsn_orcpt) 247 rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%s", 248 MAIL_ATTR_DSN_ORCPT, attr.rcpt.dsn_orcpt); 249 if (attr.rcpt.dsn_notify) 250 rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%d", 251 MAIL_ATTR_DSN_NOTIFY, attr.rcpt.dsn_notify); 252 if (*attr.rcpt.orig_addr) 253 rec_fputs(info->cleanup, REC_TYPE_ORCP, attr.rcpt.orig_addr); 254 rec_fputs(info->cleanup, REC_TYPE_RCPT, attr.rcpt.address); 255 256 return (vstream_ferror(info->cleanup)); 257 } 258 259 /* forward_send - send forwarded message */ 260 261 static int forward_send(FORWARD_INFO *info, DELIVER_REQUEST *request, 262 DELIVER_ATTR attr, char *delivered) 263 { 264 const char *myname = "forward_send"; 265 VSTRING *buffer = vstring_alloc(100); 266 VSTRING *folded; 267 int status; 268 int rec_type = 0; 269 270 /* 271 * Start the message content segment. Prepend our Delivered-To: header to 272 * the message data. Stop at the first error. XXX Rely on the front-end 273 * services to enforce record size limits. 274 */ 275 rec_fputs(info->cleanup, REC_TYPE_MESG, ""); 276 vstring_strcpy(buffer, delivered); 277 rec_fprintf(info->cleanup, REC_TYPE_NORM, "Received: by %s (%s)", 278 var_myhostname, var_mail_name); 279 rec_fprintf(info->cleanup, REC_TYPE_NORM, "\tid %s; %s", 280 info->queue_id, mail_date(info->posting_time.tv_sec)); 281 if (local_deliver_hdr_mask & DELIVER_HDR_FWD) { 282 folded = vstring_alloc(100); 283 rec_fprintf(info->cleanup, REC_TYPE_NORM, "Delivered-To: %s", 284 casefold(folded, (STR(buffer)))); 285 vstring_free(folded); 286 } 287 if ((status = vstream_ferror(info->cleanup)) == 0) 288 if (vstream_fseek(attr.fp, attr.offset, SEEK_SET) < 0) 289 msg_fatal("%s: seek queue file %s: %m:", 290 myname, VSTREAM_PATH(attr.fp)); 291 while (status == 0 && (rec_type = rec_get(attr.fp, buffer, 0)) > 0) { 292 if (rec_type != REC_TYPE_CONT && rec_type != REC_TYPE_NORM) 293 break; 294 status = (REC_PUT_BUF(info->cleanup, rec_type, buffer) != rec_type); 295 } 296 if (status == 0 && rec_type != REC_TYPE_XTRA) { 297 msg_warn("%s: bad record type: %d in message content", 298 info->queue_id, rec_type); 299 status |= mark_corrupt(attr.fp); 300 } 301 302 /* 303 * Send the end-of-data marker only when there were no errors. 304 */ 305 if (status == 0) { 306 rec_fputs(info->cleanup, REC_TYPE_XTRA, ""); 307 rec_fputs(info->cleanup, REC_TYPE_END, ""); 308 } 309 310 /* 311 * Retrieve the cleanup service completion status only if there are no 312 * problems. 313 */ 314 if (status == 0) 315 if (vstream_fflush(info->cleanup) 316 || attr_scan(info->cleanup, ATTR_FLAG_MISSING, 317 RECV_ATTR_INT(MAIL_ATTR_STATUS, &status), 318 ATTR_TYPE_END) != 1) 319 status = 1; 320 321 /* 322 * Log successful forwarding. 323 * 324 * XXX DSN alias and .forward expansion already report SUCCESS, so don't do 325 * it again here. 326 */ 327 if (status == 0) { 328 attr.rcpt.dsn_notify = 329 (attr.rcpt.dsn_notify == DSN_NOTIFY_SUCCESS ? 330 DSN_NOTIFY_NEVER : attr.rcpt.dsn_notify & ~DSN_NOTIFY_SUCCESS); 331 dsb_update(attr.why, "2.0.0", "relayed", DSB_SKIP_RMTA, DSB_SKIP_REPLY, 332 "forwarded as %s", info->queue_id); 333 status = sent(BOUNCE_FLAGS(request), SENT_ATTR(attr)); 334 } 335 336 /* 337 * Cleanup. 338 */ 339 vstring_free(buffer); 340 return (status); 341 } 342 343 /* forward_finish - complete message forwarding requests and clean up */ 344 345 int forward_finish(DELIVER_REQUEST *request, DELIVER_ATTR attr, int cancel) 346 { 347 HTABLE_INFO **dt_list; 348 HTABLE_INFO **dt; 349 HTABLE_INFO **sn_list; 350 HTABLE_INFO **sn; 351 HTABLE *table_snd; 352 char *delivered; 353 char *sender; 354 FORWARD_INFO *info; 355 int status = cancel; 356 357 /* 358 * Sanity checks. 359 */ 360 if (forward_dt == 0) 361 msg_panic("forward_finish: missing forward_init call"); 362 363 /* 364 * Walk over all delivered-to header addresses and over each envelope 365 * sender address. 366 */ 367 for (dt = dt_list = htable_list(forward_dt); *dt; dt++) { 368 delivered = dt[0]->key; 369 table_snd = (HTABLE *) dt[0]->value; 370 for (sn = sn_list = htable_list(table_snd); *sn; sn++) { 371 sender = sn[0]->key; 372 info = (FORWARD_INFO *) sn[0]->value; 373 if (status == 0) 374 status |= forward_send(info, request, attr, delivered); 375 if (msg_verbose) 376 msg_info("forward_finish: delivered %s sender %s status %d", 377 delivered, sender, status); 378 (void) vstream_fclose(info->cleanup); 379 myfree(info->queue_id); 380 myfree((void *) info); 381 } 382 myfree((void *) sn_list); 383 htable_free(table_snd, (void (*) (void *)) 0); 384 } 385 myfree((void *) dt_list); 386 htable_free(forward_dt, (void (*) (void *)) 0); 387 forward_dt = 0; 388 return (status); 389 } 390