1 /* $NetBSD: forward.c,v 1.1.1.3 2013/09/25 19:06:31 tron 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 85 /* Application-specific. */ 86 87 #include "local.h" 88 89 /* 90 * Use one cleanup service connection for each (delivered to, sender) pair. 91 */ 92 static HTABLE *forward_dt; 93 94 typedef struct FORWARD_INFO { 95 VSTREAM *cleanup; /* clean up service handle */ 96 char *queue_id; /* forwarded message queue id */ 97 struct timeval posting_time; /* posting time */ 98 } FORWARD_INFO; 99 100 /* forward_init - prepare for forwarding */ 101 102 int forward_init(void) 103 { 104 105 /* 106 * Sanity checks. 107 */ 108 if (forward_dt != 0) 109 msg_panic("forward_init: missing forward_finish call"); 110 111 forward_dt = htable_create(0); 112 return (0); 113 } 114 115 /* forward_open - open connection to cleanup service */ 116 117 static FORWARD_INFO *forward_open(DELIVER_REQUEST *request, const char *sender) 118 { 119 VSTRING *buffer = vstring_alloc(100); 120 FORWARD_INFO *info; 121 VSTREAM *cleanup; 122 123 #define FORWARD_OPEN_RETURN(res) do { \ 124 vstring_free(buffer); \ 125 return (res); \ 126 } while (0) 127 128 /* 129 * Contact the cleanup service and save the new mail queue id. Request 130 * that the cleanup service bounces bad messages to the sender so that we 131 * can avoid the trouble of bounce management. 132 * 133 * In case you wonder what kind of bounces, examples are "too many hops", 134 * "message too large", perhaps some others. The reason not to bounce 135 * ourselves is that we don't really know who the recipients are. 136 */ 137 cleanup = mail_connect(MAIL_CLASS_PUBLIC, var_cleanup_service, BLOCKING); 138 if (cleanup == 0) 139 FORWARD_OPEN_RETURN(0); 140 close_on_exec(vstream_fileno(cleanup), CLOSE_ON_EXEC); 141 if (attr_scan(cleanup, ATTR_FLAG_STRICT, 142 ATTR_TYPE_STR, MAIL_ATTR_QUEUEID, buffer, 143 ATTR_TYPE_END) != 1) { 144 vstream_fclose(cleanup); 145 FORWARD_OPEN_RETURN(0); 146 } 147 info = (FORWARD_INFO *) mymalloc(sizeof(FORWARD_INFO)); 148 info->cleanup = cleanup; 149 info->queue_id = mystrdup(STR(buffer)); 150 GETTIMEOFDAY(&info->posting_time); 151 152 #define FORWARD_CLEANUP_FLAGS (CLEANUP_FLAG_BOUNCE | CLEANUP_FLAG_MASK_INTERNAL) 153 154 attr_print(cleanup, ATTR_FLAG_NONE, 155 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, FORWARD_CLEANUP_FLAGS, 156 ATTR_TYPE_END); 157 158 /* 159 * Send initial message envelope information. For bounces, set the 160 * designated sender: mailing list owner, posting user, whatever. 161 */ 162 rec_fprintf(cleanup, REC_TYPE_TIME, REC_TYPE_TIME_FORMAT, 163 REC_TYPE_TIME_ARG(info->posting_time)); 164 rec_fputs(cleanup, REC_TYPE_FROM, sender); 165 166 /* 167 * Don't send the original envelope ID or full/headers return mask if it 168 * was reset due to mailing list expansion. 169 */ 170 if (request->dsn_ret) 171 rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%d", 172 MAIL_ATTR_DSN_RET, request->dsn_ret); 173 if (request->dsn_envid && *(request->dsn_envid)) 174 rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%s", 175 MAIL_ATTR_DSN_ENVID, request->dsn_envid); 176 177 /* 178 * Zero-length attribute values are place holders for unavailable 179 * attribute values. See qmgr_message.c. They are not meant to be 180 * propagated to queue files. 181 */ 182 #define PASS_ATTR(fp, name, value) do { \ 183 if ((value) && *(value)) \ 184 rec_fprintf((fp), REC_TYPE_ATTR, "%s=%s", (name), (value)); \ 185 } while (0) 186 187 /* 188 * XXX encapsulate these as one object. 189 */ 190 PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_NAME, request->client_name); 191 PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_ADDR, request->client_addr); 192 PASS_ATTR(cleanup, MAIL_ATTR_LOG_PROTO_NAME, request->client_proto); 193 PASS_ATTR(cleanup, MAIL_ATTR_LOG_HELO_NAME, request->client_helo); 194 PASS_ATTR(cleanup, MAIL_ATTR_SASL_METHOD, request->sasl_method); 195 PASS_ATTR(cleanup, MAIL_ATTR_SASL_USERNAME, request->sasl_username); 196 PASS_ATTR(cleanup, MAIL_ATTR_SASL_SENDER, request->sasl_sender); 197 PASS_ATTR(cleanup, MAIL_ATTR_LOG_IDENT, request->log_ident); 198 PASS_ATTR(cleanup, MAIL_ATTR_RWR_CONTEXT, request->rewrite_context); 199 200 FORWARD_OPEN_RETURN(info); 201 } 202 203 /* forward_append - append recipient to message envelope */ 204 205 int forward_append(DELIVER_ATTR attr) 206 { 207 FORWARD_INFO *info; 208 HTABLE *table_snd; 209 210 /* 211 * Sanity checks. 212 */ 213 if (msg_verbose) 214 msg_info("forward delivered=%s sender=%s recip=%s", 215 attr.delivered, attr.sender, attr.rcpt.address); 216 if (forward_dt == 0) 217 msg_panic("forward_append: missing forward_init call"); 218 219 /* 220 * In order to find the recipient list, first index a table by 221 * delivered-to header address, then by envelope sender address. 222 */ 223 if ((table_snd = (HTABLE *) htable_find(forward_dt, attr.delivered)) == 0) { 224 table_snd = htable_create(0); 225 htable_enter(forward_dt, attr.delivered, (char *) table_snd); 226 } 227 if ((info = (FORWARD_INFO *) htable_find(table_snd, attr.sender)) == 0) { 228 if ((info = forward_open(attr.request, attr.sender)) == 0) 229 return (-1); 230 htable_enter(table_snd, attr.sender, (char *) info); 231 } 232 233 /* 234 * Append the recipient to the message envelope. Don't send the original 235 * recipient or notification mask if it was reset due to mailing list 236 * expansion. 237 */ 238 if (*attr.rcpt.dsn_orcpt) 239 rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%s", 240 MAIL_ATTR_DSN_ORCPT, attr.rcpt.dsn_orcpt); 241 if (attr.rcpt.dsn_notify) 242 rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%d", 243 MAIL_ATTR_DSN_NOTIFY, attr.rcpt.dsn_notify); 244 if (*attr.rcpt.orig_addr) 245 rec_fputs(info->cleanup, REC_TYPE_ORCP, attr.rcpt.orig_addr); 246 rec_fputs(info->cleanup, REC_TYPE_RCPT, attr.rcpt.address); 247 248 return (vstream_ferror(info->cleanup)); 249 } 250 251 /* forward_send - send forwarded message */ 252 253 static int forward_send(FORWARD_INFO *info, DELIVER_REQUEST *request, 254 DELIVER_ATTR attr, char *delivered) 255 { 256 const char *myname = "forward_send"; 257 VSTRING *buffer = vstring_alloc(100); 258 int status; 259 int rec_type = 0; 260 261 /* 262 * Start the message content segment. Prepend our Delivered-To: header to 263 * the message data. Stop at the first error. XXX Rely on the front-end 264 * services to enforce record size limits. 265 */ 266 rec_fputs(info->cleanup, REC_TYPE_MESG, ""); 267 vstring_strcpy(buffer, delivered); 268 rec_fprintf(info->cleanup, REC_TYPE_NORM, "Received: by %s (%s)", 269 var_myhostname, var_mail_name); 270 rec_fprintf(info->cleanup, REC_TYPE_NORM, "\tid %s; %s", 271 info->queue_id, mail_date(info->posting_time.tv_sec)); 272 if (local_deliver_hdr_mask & DELIVER_HDR_FWD) 273 rec_fprintf(info->cleanup, REC_TYPE_NORM, "Delivered-To: %s", 274 lowercase(STR(buffer))); 275 if ((status = vstream_ferror(info->cleanup)) == 0) 276 if (vstream_fseek(attr.fp, attr.offset, SEEK_SET) < 0) 277 msg_fatal("%s: seek queue file %s: %m:", 278 myname, VSTREAM_PATH(attr.fp)); 279 while (status == 0 && (rec_type = rec_get(attr.fp, buffer, 0)) > 0) { 280 if (rec_type != REC_TYPE_CONT && rec_type != REC_TYPE_NORM) 281 break; 282 status = (REC_PUT_BUF(info->cleanup, rec_type, buffer) != rec_type); 283 } 284 if (status == 0 && rec_type != REC_TYPE_XTRA) { 285 msg_warn("%s: bad record type: %d in message content", 286 info->queue_id, rec_type); 287 status |= mark_corrupt(attr.fp); 288 } 289 290 /* 291 * Send the end-of-data marker only when there were no errors. 292 */ 293 if (status == 0) { 294 rec_fputs(info->cleanup, REC_TYPE_XTRA, ""); 295 rec_fputs(info->cleanup, REC_TYPE_END, ""); 296 } 297 298 /* 299 * Retrieve the cleanup service completion status only if there are no 300 * problems. 301 */ 302 if (status == 0) 303 if (vstream_fflush(info->cleanup) 304 || attr_scan(info->cleanup, ATTR_FLAG_MISSING, 305 ATTR_TYPE_INT, MAIL_ATTR_STATUS, &status, 306 ATTR_TYPE_END) != 1) 307 status = 1; 308 309 /* 310 * Log successful forwarding. 311 * 312 * XXX DSN alias and .forward expansion already report SUCCESS, so don't do 313 * it again here. 314 */ 315 if (status == 0) { 316 attr.rcpt.dsn_notify = 317 (attr.rcpt.dsn_notify == DSN_NOTIFY_SUCCESS ? 318 DSN_NOTIFY_NEVER : attr.rcpt.dsn_notify & ~DSN_NOTIFY_SUCCESS); 319 dsb_update(attr.why, "2.0.0", "relayed", DSB_SKIP_RMTA, DSB_SKIP_REPLY, 320 "forwarded as %s", info->queue_id); 321 status = sent(BOUNCE_FLAGS(request), SENT_ATTR(attr)); 322 } 323 324 /* 325 * Cleanup. 326 */ 327 vstring_free(buffer); 328 return (status); 329 } 330 331 /* forward_finish - complete message forwarding requests and clean up */ 332 333 int forward_finish(DELIVER_REQUEST *request, DELIVER_ATTR attr, int cancel) 334 { 335 HTABLE_INFO **dt_list; 336 HTABLE_INFO **dt; 337 HTABLE_INFO **sn_list; 338 HTABLE_INFO **sn; 339 HTABLE *table_snd; 340 char *delivered; 341 char *sender; 342 FORWARD_INFO *info; 343 int status = cancel; 344 345 /* 346 * Sanity checks. 347 */ 348 if (forward_dt == 0) 349 msg_panic("forward_finish: missing forward_init call"); 350 351 /* 352 * Walk over all delivered-to header addresses and over each envelope 353 * sender address. 354 */ 355 for (dt = dt_list = htable_list(forward_dt); *dt; dt++) { 356 delivered = dt[0]->key; 357 table_snd = (HTABLE *) dt[0]->value; 358 for (sn = sn_list = htable_list(table_snd); *sn; sn++) { 359 sender = sn[0]->key; 360 info = (FORWARD_INFO *) sn[0]->value; 361 if (status == 0) 362 status |= forward_send(info, request, attr, delivered); 363 if (msg_verbose) 364 msg_info("forward_finish: delivered %s sender %s status %d", 365 delivered, sender, status); 366 (void) vstream_fclose(info->cleanup); 367 myfree(info->queue_id); 368 myfree((char *) info); 369 } 370 myfree((char *) sn_list); 371 htable_free(table_snd, (void (*) (char *)) 0); 372 } 373 myfree((char *) dt_list); 374 htable_free(forward_dt, (void (*) (char *)) 0); 375 forward_dt = 0; 376 return (status); 377 } 378