1 /* $NetBSD: forward.c,v 1.1.1.1 2009/06/23 10:08:48 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 /* 124 * Contact the cleanup service and save the new mail queue id. Request 125 * that the cleanup service bounces bad messages to the sender so that we 126 * can avoid the trouble of bounce management. 127 * 128 * In case you wonder what kind of bounces, examples are "too many hops", 129 * "message too large", perhaps some others. The reason not to bounce 130 * ourselves is that we don't really know who the recipients are. 131 */ 132 cleanup = mail_connect(MAIL_CLASS_PUBLIC, var_cleanup_service, BLOCKING); 133 if (cleanup == 0) 134 return (0); 135 close_on_exec(vstream_fileno(cleanup), CLOSE_ON_EXEC); 136 if (attr_scan(cleanup, ATTR_FLAG_STRICT, 137 ATTR_TYPE_STR, MAIL_ATTR_QUEUEID, buffer, 138 ATTR_TYPE_END) != 1) { 139 vstream_fclose(cleanup); 140 return (0); 141 } 142 info = (FORWARD_INFO *) mymalloc(sizeof(FORWARD_INFO)); 143 info->cleanup = cleanup; 144 info->queue_id = mystrdup(STR(buffer)); 145 GETTIMEOFDAY(&info->posting_time); 146 147 #define FORWARD_CLEANUP_FLAGS (CLEANUP_FLAG_BOUNCE | CLEANUP_FLAG_MASK_INTERNAL) 148 149 attr_print(cleanup, ATTR_FLAG_NONE, 150 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, FORWARD_CLEANUP_FLAGS, 151 ATTR_TYPE_END); 152 153 /* 154 * Send initial message envelope information. For bounces, set the 155 * designated sender: mailing list owner, posting user, whatever. 156 */ 157 rec_fprintf(cleanup, REC_TYPE_TIME, REC_TYPE_TIME_FORMAT, 158 REC_TYPE_TIME_ARG(info->posting_time)); 159 rec_fputs(cleanup, REC_TYPE_FROM, sender); 160 161 /* 162 * Don't send the original envelope ID or full/headers return mask if it 163 * was reset due to mailing list expansion. 164 */ 165 if (request->dsn_ret) 166 rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%d", 167 MAIL_ATTR_DSN_RET, request->dsn_ret); 168 if (request->dsn_envid && *(request->dsn_envid)) 169 rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%s", 170 MAIL_ATTR_DSN_ENVID, request->dsn_envid); 171 172 /* 173 * Zero-length attribute values are place holders for unavailable 174 * attribute values. See qmgr_message.c. They are not meant to be 175 * propagated to queue files. 176 */ 177 #define PASS_ATTR(fp, name, value) do { \ 178 if ((value) && *(value)) \ 179 rec_fprintf((fp), REC_TYPE_ATTR, "%s=%s", (name), (value)); \ 180 } while (0) 181 182 PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_NAME, request->client_name); 183 PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_ADDR, request->client_addr); 184 PASS_ATTR(cleanup, MAIL_ATTR_LOG_PROTO_NAME, request->client_proto); 185 PASS_ATTR(cleanup, MAIL_ATTR_LOG_HELO_NAME, request->client_helo); 186 PASS_ATTR(cleanup, MAIL_ATTR_SASL_METHOD, request->sasl_method); 187 PASS_ATTR(cleanup, MAIL_ATTR_SASL_USERNAME, request->sasl_username); 188 PASS_ATTR(cleanup, MAIL_ATTR_SASL_SENDER, request->sasl_sender); 189 PASS_ATTR(cleanup, MAIL_ATTR_RWR_CONTEXT, request->rewrite_context); 190 191 vstring_free(buffer); 192 return (info); 193 } 194 195 /* forward_append - append recipient to message envelope */ 196 197 int forward_append(DELIVER_ATTR attr) 198 { 199 FORWARD_INFO *info; 200 HTABLE *table_snd; 201 202 /* 203 * Sanity checks. 204 */ 205 if (msg_verbose) 206 msg_info("forward delivered=%s sender=%s recip=%s", 207 attr.delivered, attr.sender, attr.rcpt.address); 208 if (forward_dt == 0) 209 msg_panic("forward_append: missing forward_init call"); 210 211 /* 212 * In order to find the recipient list, first index a table by 213 * delivered-to header address, then by envelope sender address. 214 */ 215 if ((table_snd = (HTABLE *) htable_find(forward_dt, attr.delivered)) == 0) { 216 table_snd = htable_create(0); 217 htable_enter(forward_dt, attr.delivered, (char *) table_snd); 218 } 219 if ((info = (FORWARD_INFO *) htable_find(table_snd, attr.sender)) == 0) { 220 if ((info = forward_open(attr.request, attr.sender)) == 0) 221 return (-1); 222 htable_enter(table_snd, attr.sender, (char *) info); 223 } 224 225 /* 226 * Append the recipient to the message envelope. Don't send the original 227 * recipient or notification mask if it was reset due to mailing list 228 * expansion. 229 */ 230 if (*attr.rcpt.dsn_orcpt) 231 rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%s", 232 MAIL_ATTR_DSN_ORCPT, attr.rcpt.dsn_orcpt); 233 if (attr.rcpt.dsn_notify) 234 rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%d", 235 MAIL_ATTR_DSN_NOTIFY, attr.rcpt.dsn_notify); 236 if (*attr.rcpt.orig_addr) 237 rec_fputs(info->cleanup, REC_TYPE_ORCP, attr.rcpt.orig_addr); 238 rec_fputs(info->cleanup, REC_TYPE_RCPT, attr.rcpt.address); 239 240 return (vstream_ferror(info->cleanup)); 241 } 242 243 /* forward_send - send forwarded message */ 244 245 static int forward_send(FORWARD_INFO *info, DELIVER_REQUEST *request, 246 DELIVER_ATTR attr, char *delivered) 247 { 248 const char *myname = "forward_send"; 249 VSTRING *buffer = vstring_alloc(100); 250 int status; 251 int rec_type = 0; 252 253 /* 254 * Start the message content segment. Prepend our Delivered-To: header to 255 * the message data. Stop at the first error. XXX Rely on the front-end 256 * services to enforce record size limits. 257 */ 258 rec_fputs(info->cleanup, REC_TYPE_MESG, ""); 259 vstring_strcpy(buffer, delivered); 260 rec_fprintf(info->cleanup, REC_TYPE_NORM, "Received: by %s (%s)", 261 var_myhostname, var_mail_name); 262 rec_fprintf(info->cleanup, REC_TYPE_NORM, "\tid %s; %s", 263 info->queue_id, mail_date(info->posting_time.tv_sec)); 264 if (local_deliver_hdr_mask & DELIVER_HDR_FWD) 265 rec_fprintf(info->cleanup, REC_TYPE_NORM, "Delivered-To: %s", 266 lowercase(STR(buffer))); 267 if ((status = vstream_ferror(info->cleanup)) == 0) 268 if (vstream_fseek(attr.fp, attr.offset, SEEK_SET) < 0) 269 msg_fatal("%s: seek queue file %s: %m:", 270 myname, VSTREAM_PATH(attr.fp)); 271 while (status == 0 && (rec_type = rec_get(attr.fp, buffer, 0)) > 0) { 272 if (rec_type != REC_TYPE_CONT && rec_type != REC_TYPE_NORM) 273 break; 274 status = (REC_PUT_BUF(info->cleanup, rec_type, buffer) != rec_type); 275 } 276 if (status == 0 && rec_type != REC_TYPE_XTRA) { 277 msg_warn("%s: bad record type: %d in message content", 278 info->queue_id, rec_type); 279 status |= mark_corrupt(attr.fp); 280 } 281 282 /* 283 * Send the end-of-data marker only when there were no errors. 284 */ 285 if (status == 0) { 286 rec_fputs(info->cleanup, REC_TYPE_XTRA, ""); 287 rec_fputs(info->cleanup, REC_TYPE_END, ""); 288 } 289 290 /* 291 * Retrieve the cleanup service completion status only if there are no 292 * problems. 293 */ 294 if (status == 0) 295 if (vstream_fflush(info->cleanup) 296 || attr_scan(info->cleanup, ATTR_FLAG_MISSING, 297 ATTR_TYPE_INT, MAIL_ATTR_STATUS, &status, 298 ATTR_TYPE_END) != 1) 299 status = 1; 300 301 /* 302 * Log successful forwarding. 303 * 304 * XXX DSN alias and .forward expansion already report SUCCESS, so don't do 305 * it again here. 306 */ 307 if (status == 0) { 308 attr.rcpt.dsn_notify = 309 (attr.rcpt.dsn_notify == DSN_NOTIFY_SUCCESS ? 310 DSN_NOTIFY_NEVER : attr.rcpt.dsn_notify & ~DSN_NOTIFY_SUCCESS); 311 dsb_update(attr.why, "2.0.0", "relayed", DSB_SKIP_RMTA, DSB_SKIP_REPLY, 312 "forwarded as %s", info->queue_id); 313 status = sent(BOUNCE_FLAGS(request), SENT_ATTR(attr)); 314 } 315 316 /* 317 * Cleanup. 318 */ 319 vstring_free(buffer); 320 return (status); 321 } 322 323 /* forward_finish - complete message forwarding requests and clean up */ 324 325 int forward_finish(DELIVER_REQUEST *request, DELIVER_ATTR attr, int cancel) 326 { 327 HTABLE_INFO **dt_list; 328 HTABLE_INFO **dt; 329 HTABLE_INFO **sn_list; 330 HTABLE_INFO **sn; 331 HTABLE *table_snd; 332 char *delivered; 333 char *sender; 334 FORWARD_INFO *info; 335 int status = cancel; 336 337 /* 338 * Sanity checks. 339 */ 340 if (forward_dt == 0) 341 msg_panic("forward_finish: missing forward_init call"); 342 343 /* 344 * Walk over all delivered-to header addresses and over each envelope 345 * sender address. 346 */ 347 for (dt = dt_list = htable_list(forward_dt); *dt; dt++) { 348 delivered = dt[0]->key; 349 table_snd = (HTABLE *) dt[0]->value; 350 for (sn = sn_list = htable_list(table_snd); *sn; sn++) { 351 sender = sn[0]->key; 352 info = (FORWARD_INFO *) sn[0]->value; 353 if (status == 0) 354 status |= forward_send(info, request, attr, delivered); 355 if (msg_verbose) 356 msg_info("forward_finish: delivered %s sender %s status %d", 357 delivered, sender, status); 358 (void) vstream_fclose(info->cleanup); 359 myfree(info->queue_id); 360 myfree((char *) info); 361 } 362 myfree((char *) sn_list); 363 htable_free(table_snd, (void (*) (char *)) 0); 364 } 365 myfree((char *) dt_list); 366 htable_free(forward_dt, (void (*) (char *)) 0); 367 forward_dt = 0; 368 return (status); 369 } 370