| 1 | /* pop.c: client routines for talking to a POP3-protocol post-office server |
| 2 | |
| 3 | Copyright (C) 1991, 1993, 1996-1997, 1999, 2001-2014 Free Software |
| 4 | Foundation, Inc. |
| 5 | |
| 6 | Author: Jonathan Kamens <jik@security.ov.com> |
| 7 | |
| 8 | This file is part of GNU Emacs. |
| 9 | |
| 10 | GNU Emacs is free software: you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation, either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | GNU Emacs is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 22 | |
| 23 | |
| 24 | #include <config.h> |
| 25 | |
| 26 | #ifdef MAIL_USE_POP |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | #ifdef WINDOWSNT |
| 30 | #include "ntlib.h" |
| 31 | #include <winsock.h> |
| 32 | #undef SOCKET_ERROR |
| 33 | #define RECV(s,buf,len,flags) recv (s,buf,len,flags) |
| 34 | #define SEND(s,buf,len,flags) send (s,buf,len,flags) |
| 35 | #define CLOSESOCKET(s) closesocket (s) |
| 36 | #else |
| 37 | #include <netinet/in.h> |
| 38 | #include <sys/socket.h> |
| 39 | #define RECV(s,buf,len,flags) read (s,buf,len) |
| 40 | #define SEND(s,buf,len,flags) write (s,buf,len) |
| 41 | #define CLOSESOCKET(s) close (s) |
| 42 | #endif |
| 43 | #include <pop.h> |
| 44 | |
| 45 | #ifdef sun |
| 46 | #include <malloc.h> |
| 47 | #endif /* sun */ |
| 48 | |
| 49 | #ifdef HESIOD |
| 50 | #include <hesiod.h> |
| 51 | /* |
| 52 | * It really shouldn't be necessary to put this declaration here, but |
| 53 | * the version of hesiod.h that Athena has installed in release 7.2 |
| 54 | * doesn't declare this function; I don't know if the 7.3 version of |
| 55 | * hesiod.h does. |
| 56 | */ |
| 57 | extern struct servent *hes_getservbyname (/* char *, char * */); |
| 58 | #endif |
| 59 | |
| 60 | #include <pwd.h> |
| 61 | #include <netdb.h> |
| 62 | #include <errno.h> |
| 63 | #include <stdio.h> |
| 64 | #include <string.h> |
| 65 | #include <unistd.h> |
| 66 | |
| 67 | #ifdef KERBEROS |
| 68 | # ifdef HAVE_KRB5_H |
| 69 | # include <krb5.h> |
| 70 | # endif |
| 71 | # ifdef HAVE_KRB_H |
| 72 | # include <krb.h> |
| 73 | # else |
| 74 | # ifdef HAVE_KERBEROSIV_KRB_H |
| 75 | # include <kerberosIV/krb.h> |
| 76 | # else |
| 77 | # ifdef HAVE_KERBEROS_KRB_H |
| 78 | # include <kerberos/krb.h> |
| 79 | # endif |
| 80 | # endif |
| 81 | # endif |
| 82 | # ifdef HAVE_COM_ERR_H |
| 83 | # include <com_err.h> |
| 84 | # endif |
| 85 | #endif /* KERBEROS */ |
| 86 | |
| 87 | #include <min-max.h> |
| 88 | |
| 89 | #ifdef KERBEROS |
| 90 | #ifndef KERBEROS5 |
| 91 | extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *, |
| 92 | u_long, MSG_DAT *, CREDENTIALS *, Key_schedule, |
| 93 | struct sockaddr_in *, struct sockaddr_in *, |
| 94 | char * */); |
| 95 | extern char *krb_realmofhost (/* char * */); |
| 96 | #endif /* ! KERBEROS5 */ |
| 97 | #endif /* KERBEROS */ |
| 98 | |
| 99 | #ifndef WINDOWSNT |
| 100 | #ifndef HAVE_H_ERRNO |
| 101 | extern int h_errno; |
| 102 | #endif |
| 103 | #endif |
| 104 | |
| 105 | static int socket_connection (char *, int); |
| 106 | static int pop_getline (popserver, char **); |
| 107 | static int sendline (popserver, const char *); |
| 108 | static int fullwrite (int, char *, int); |
| 109 | static int getok (popserver); |
| 110 | #if 0 |
| 111 | static int gettermination (popserver); |
| 112 | #endif |
| 113 | static void pop_trash (popserver); |
| 114 | static char *find_crlf (char *, int); |
| 115 | |
| 116 | #define ERROR_MAX 160 /* a pretty arbitrary size, but needs |
| 117 | to be bigger than the original |
| 118 | value of 80 */ |
| 119 | #define POP_PORT 110 |
| 120 | #define POP_SERVICE "pop3" /* we don't want the POP2 port! */ |
| 121 | #ifdef KERBEROS |
| 122 | #define KPOP_PORT 1109 |
| 123 | #define KPOP_SERVICE "kpop" /* never used: look for 20060515 to see why */ |
| 124 | #endif |
| 125 | |
| 126 | char pop_error[ERROR_MAX]; |
| 127 | bool pop_debug = false; |
| 128 | |
| 129 | /* |
| 130 | * Function: pop_open (char *host, char *username, char *password, |
| 131 | * int flags) |
| 132 | * |
| 133 | * Purpose: Establishes a connection with a post-office server, and |
| 134 | * completes the authorization portion of the session. |
| 135 | * |
| 136 | * Arguments: |
| 137 | * host The server host with which the connection should be |
| 138 | * established. Optional. If omitted, internal |
| 139 | * heuristics will be used to determine the server host, |
| 140 | * if possible. |
| 141 | * username |
| 142 | * The username of the mail-drop to access. Optional. |
| 143 | * If omitted, internal heuristics will be used to |
| 144 | * determine the username, if possible. |
| 145 | * password |
| 146 | * The password to use for authorization. If omitted, |
| 147 | * internal heuristics will be used to determine the |
| 148 | * password, if possible. |
| 149 | * flags A bit mask containing flags controlling certain |
| 150 | * functions of the routine. Valid flags are defined in |
| 151 | * the file pop.h |
| 152 | * |
| 153 | * Return value: Upon successful establishment of a connection, a |
| 154 | * non-null popserver will be returned. Otherwise, null will be |
| 155 | * returned, and the string variable pop_error will contain an |
| 156 | * explanation of the error. |
| 157 | */ |
| 158 | popserver |
| 159 | pop_open (char *host, char *username, char *password, int flags) |
| 160 | { |
| 161 | int sock; |
| 162 | popserver server; |
| 163 | |
| 164 | /* Determine the user name */ |
| 165 | if (! username) |
| 166 | { |
| 167 | username = getenv ("USER"); |
| 168 | if (! (username && *username)) |
| 169 | { |
| 170 | username = getlogin (); |
| 171 | if (! (username && *username)) |
| 172 | { |
| 173 | struct passwd *passwd; |
| 174 | passwd = getpwuid (getuid ()); |
| 175 | if (passwd && passwd->pw_name && *passwd->pw_name) |
| 176 | { |
| 177 | username = passwd->pw_name; |
| 178 | } |
| 179 | else |
| 180 | { |
| 181 | strcpy (pop_error, "Could not determine username"); |
| 182 | return (0); |
| 183 | } |
| 184 | } |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Determine the mail host. |
| 190 | */ |
| 191 | |
| 192 | if (! host) |
| 193 | { |
| 194 | host = getenv ("MAILHOST"); |
| 195 | } |
| 196 | |
| 197 | #ifdef HESIOD |
| 198 | if ((! host) && (! (flags & POP_NO_HESIOD))) |
| 199 | { |
| 200 | struct hes_postoffice *office; |
| 201 | office = hes_getmailhost (username); |
| 202 | if (office && office->po_type && (! strcmp (office->po_type, "POP")) |
| 203 | && office->po_name && *office->po_name && office->po_host |
| 204 | && *office->po_host) |
| 205 | { |
| 206 | host = office->po_host; |
| 207 | username = office->po_name; |
| 208 | } |
| 209 | } |
| 210 | #endif |
| 211 | |
| 212 | #ifdef MAILHOST |
| 213 | if (! host) |
| 214 | { |
| 215 | host = MAILHOST; |
| 216 | } |
| 217 | #endif |
| 218 | |
| 219 | if (! host) |
| 220 | { |
| 221 | strcpy (pop_error, "Could not determine POP server"); |
| 222 | return (0); |
| 223 | } |
| 224 | |
| 225 | /* Determine the password */ |
| 226 | #ifdef KERBEROS |
| 227 | #define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS)) |
| 228 | #else |
| 229 | #define DONT_NEED_PASSWORD 0 |
| 230 | #endif |
| 231 | |
| 232 | if ((! password) && (! DONT_NEED_PASSWORD)) |
| 233 | { |
| 234 | if (! (flags & POP_NO_GETPASS)) |
| 235 | { |
| 236 | password = getpass ("Enter POP password:"); |
| 237 | } |
| 238 | if (! password) |
| 239 | { |
| 240 | strcpy (pop_error, "Could not determine POP password"); |
| 241 | return (0); |
| 242 | } |
| 243 | } |
| 244 | if (password) /* always true, detected 20060515 */ |
| 245 | flags |= POP_NO_KERBEROS; |
| 246 | else |
| 247 | password = username; /* dead code, detected 20060515 */ |
| 248 | /** "kpop" service is never used: look for 20060515 to see why **/ |
| 249 | |
| 250 | sock = socket_connection (host, flags); |
| 251 | if (sock == -1) |
| 252 | return (0); |
| 253 | |
| 254 | server = (popserver) malloc (sizeof (struct _popserver)); |
| 255 | if (! server) |
| 256 | { |
| 257 | strcpy (pop_error, "Out of memory in pop_open"); |
| 258 | return (0); |
| 259 | } |
| 260 | server->buffer = (char *) malloc (GETLINE_MIN); |
| 261 | if (! server->buffer) |
| 262 | { |
| 263 | strcpy (pop_error, "Out of memory in pop_open"); |
| 264 | free ((char *) server); |
| 265 | return (0); |
| 266 | } |
| 267 | |
| 268 | server->file = sock; |
| 269 | server->data = 0; |
| 270 | server->buffer_index = 0; |
| 271 | server->buffer_size = GETLINE_MIN; |
| 272 | server->in_multi = false; |
| 273 | server->trash_started = false; |
| 274 | |
| 275 | if (getok (server)) |
| 276 | return (0); |
| 277 | |
| 278 | /* |
| 279 | * I really shouldn't use the pop_error variable like this, but.... |
| 280 | */ |
| 281 | if (strlen (username) > ERROR_MAX - 6) |
| 282 | { |
| 283 | pop_close (server); |
| 284 | strcpy (pop_error, |
| 285 | "Username too long; recompile pop.c with larger ERROR_MAX"); |
| 286 | return (0); |
| 287 | } |
| 288 | sprintf (pop_error, "USER %s", username); |
| 289 | |
| 290 | if (sendline (server, pop_error) || getok (server)) |
| 291 | { |
| 292 | return (0); |
| 293 | } |
| 294 | |
| 295 | if (strlen (password) > ERROR_MAX - 6) |
| 296 | { |
| 297 | pop_close (server); |
| 298 | strcpy (pop_error, |
| 299 | "Password too long; recompile pop.c with larger ERROR_MAX"); |
| 300 | return (0); |
| 301 | } |
| 302 | sprintf (pop_error, "PASS %s", password); |
| 303 | |
| 304 | if (sendline (server, pop_error) || getok (server)) |
| 305 | { |
| 306 | return (0); |
| 307 | } |
| 308 | |
| 309 | return (server); |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * Function: pop_stat |
| 314 | * |
| 315 | * Purpose: Issue the STAT command to the server and return (in the |
| 316 | * value parameters) the number of messages in the maildrop and |
| 317 | * the total size of the maildrop. |
| 318 | * |
| 319 | * Return value: 0 on success, or non-zero with an error in pop_error |
| 320 | * in failure. |
| 321 | * |
| 322 | * Side effects: On failure, may make further operations on the |
| 323 | * connection impossible. |
| 324 | */ |
| 325 | int |
| 326 | pop_stat (popserver server, int *count, int *size) |
| 327 | { |
| 328 | char *fromserver; |
| 329 | char *end_ptr; |
| 330 | |
| 331 | if (server->in_multi) |
| 332 | { |
| 333 | strcpy (pop_error, "In multi-line query in pop_stat"); |
| 334 | return (-1); |
| 335 | } |
| 336 | |
| 337 | if (sendline (server, "STAT") || (pop_getline (server, &fromserver) < 0)) |
| 338 | return (-1); |
| 339 | |
| 340 | if (strncmp (fromserver, "+OK ", 4)) |
| 341 | { |
| 342 | if (0 == strncmp (fromserver, "-ERR", 4)) |
| 343 | snprintf (pop_error, ERROR_MAX, "%s", fromserver); |
| 344 | else |
| 345 | { |
| 346 | strcpy (pop_error, |
| 347 | "Unexpected response from POP server in pop_stat"); |
| 348 | pop_trash (server); |
| 349 | } |
| 350 | return (-1); |
| 351 | } |
| 352 | |
| 353 | errno = 0; |
| 354 | *count = strtol (&fromserver[4], &end_ptr, 10); |
| 355 | /* Check validity of string-to-integer conversion. */ |
| 356 | if (fromserver + 4 == end_ptr || *end_ptr != ' ' || errno) |
| 357 | { |
| 358 | strcpy (pop_error, "Unexpected response from POP server in pop_stat"); |
| 359 | pop_trash (server); |
| 360 | return (-1); |
| 361 | } |
| 362 | |
| 363 | fromserver = end_ptr; |
| 364 | |
| 365 | errno = 0; |
| 366 | *size = strtol (fromserver + 1, &end_ptr, 10); |
| 367 | if (fromserver + 1 == end_ptr || errno) |
| 368 | { |
| 369 | strcpy (pop_error, "Unexpected response from POP server in pop_stat"); |
| 370 | pop_trash (server); |
| 371 | return (-1); |
| 372 | } |
| 373 | |
| 374 | return (0); |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Function: pop_list |
| 379 | * |
| 380 | * Purpose: Performs the POP "list" command and returns (in value |
| 381 | * parameters) two malloc'd zero-terminated arrays -- one of |
| 382 | * message IDs, and a parallel one of sizes. |
| 383 | * |
| 384 | * Arguments: |
| 385 | * server The pop connection to talk to. |
| 386 | * message The number of the one message about which to get |
| 387 | * information, or 0 to get information about all |
| 388 | * messages. |
| 389 | * |
| 390 | * Return value: 0 on success, non-zero with error in pop_error on |
| 391 | * failure. |
| 392 | * |
| 393 | * Side effects: On failure, may make further operations on the |
| 394 | * connection impossible. |
| 395 | */ |
| 396 | int |
| 397 | pop_list (popserver server, int message, int **IDs, int **sizes) |
| 398 | { |
| 399 | int how_many, i; |
| 400 | char *fromserver; |
| 401 | |
| 402 | if (server->in_multi) |
| 403 | { |
| 404 | strcpy (pop_error, "In multi-line query in pop_list"); |
| 405 | return (-1); |
| 406 | } |
| 407 | |
| 408 | if (message) |
| 409 | how_many = 1; |
| 410 | else |
| 411 | { |
| 412 | int count, size; |
| 413 | if (pop_stat (server, &count, &size)) |
| 414 | return (-1); |
| 415 | how_many = count; |
| 416 | } |
| 417 | |
| 418 | *IDs = (int *) malloc ((how_many + 1) * sizeof (int)); |
| 419 | *sizes = (int *) malloc ((how_many + 1) * sizeof (int)); |
| 420 | if (! (*IDs && *sizes)) |
| 421 | { |
| 422 | strcpy (pop_error, "Out of memory in pop_list"); |
| 423 | return (-1); |
| 424 | } |
| 425 | |
| 426 | if (message) |
| 427 | { |
| 428 | sprintf (pop_error, "LIST %d", message); |
| 429 | if (sendline (server, pop_error)) |
| 430 | { |
| 431 | free ((char *) *IDs); |
| 432 | free ((char *) *sizes); |
| 433 | return (-1); |
| 434 | } |
| 435 | if (pop_getline (server, &fromserver) < 0) |
| 436 | { |
| 437 | free ((char *) *IDs); |
| 438 | free ((char *) *sizes); |
| 439 | return (-1); |
| 440 | } |
| 441 | if (strncmp (fromserver, "+OK ", 4)) |
| 442 | { |
| 443 | if (! strncmp (fromserver, "-ERR", 4)) |
| 444 | snprintf (pop_error, ERROR_MAX, "%s", fromserver); |
| 445 | else |
| 446 | { |
| 447 | strcpy (pop_error, |
| 448 | "Unexpected response from server in pop_list"); |
| 449 | pop_trash (server); |
| 450 | } |
| 451 | free ((char *) *IDs); |
| 452 | free ((char *) *sizes); |
| 453 | return (-1); |
| 454 | } |
| 455 | (*IDs)[0] = atoi (&fromserver[4]); |
| 456 | fromserver = strchr (&fromserver[4], ' '); |
| 457 | if (! fromserver) |
| 458 | { |
| 459 | strcpy (pop_error, |
| 460 | "Badly formatted response from server in pop_list"); |
| 461 | pop_trash (server); |
| 462 | free ((char *) *IDs); |
| 463 | free ((char *) *sizes); |
| 464 | return (-1); |
| 465 | } |
| 466 | (*sizes)[0] = atoi (fromserver); |
| 467 | (*IDs)[1] = (*sizes)[1] = 0; |
| 468 | return (0); |
| 469 | } |
| 470 | else |
| 471 | { |
| 472 | if (pop_multi_first (server, "LIST", &fromserver)) |
| 473 | { |
| 474 | free ((char *) *IDs); |
| 475 | free ((char *) *sizes); |
| 476 | return (-1); |
| 477 | } |
| 478 | for (i = 0; i < how_many; i++) |
| 479 | { |
| 480 | if (pop_multi_next (server, &fromserver) <= 0) |
| 481 | { |
| 482 | free ((char *) *IDs); |
| 483 | free ((char *) *sizes); |
| 484 | return (-1); |
| 485 | } |
| 486 | (*IDs)[i] = atoi (fromserver); |
| 487 | fromserver = strchr (fromserver, ' '); |
| 488 | if (! fromserver) |
| 489 | { |
| 490 | strcpy (pop_error, |
| 491 | "Badly formatted response from server in pop_list"); |
| 492 | free ((char *) *IDs); |
| 493 | free ((char *) *sizes); |
| 494 | pop_trash (server); |
| 495 | return (-1); |
| 496 | } |
| 497 | (*sizes)[i] = atoi (fromserver); |
| 498 | } |
| 499 | if (pop_multi_next (server, &fromserver) < 0) |
| 500 | { |
| 501 | free ((char *) *IDs); |
| 502 | free ((char *) *sizes); |
| 503 | return (-1); |
| 504 | } |
| 505 | else if (fromserver) |
| 506 | { |
| 507 | strcpy (pop_error, |
| 508 | "Too many response lines from server in pop_list"); |
| 509 | free ((char *) *IDs); |
| 510 | free ((char *) *sizes); |
| 511 | return (-1); |
| 512 | } |
| 513 | (*IDs)[i] = (*sizes)[i] = 0; |
| 514 | return (0); |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * Function: pop_retrieve |
| 520 | * |
| 521 | * Purpose: Retrieve a specified message from the maildrop. |
| 522 | * |
| 523 | * Arguments: |
| 524 | * server The server to retrieve from. |
| 525 | * message The message number to retrieve. |
| 526 | * markfrom |
| 527 | * If true, then mark the string "From " at the beginning |
| 528 | * of lines with '>'. |
| 529 | * msg_buf Output parameter to which a buffer containing the |
| 530 | * message is assigned. |
| 531 | * |
| 532 | * Return value: The number of bytes in msg_buf, which may contain |
| 533 | * embedded nulls, not including its final null, or -1 on error |
| 534 | * with pop_error set. |
| 535 | * |
| 536 | * Side effects: May kill connection on error. |
| 537 | */ |
| 538 | int |
| 539 | pop_retrieve (popserver server, int message, int markfrom, char **msg_buf) |
| 540 | { |
| 541 | int *IDs, *sizes, bufsize, fromcount = 0, cp = 0; |
| 542 | char *ptr, *fromserver; |
| 543 | int ret; |
| 544 | |
| 545 | if (server->in_multi) |
| 546 | { |
| 547 | strcpy (pop_error, "In multi-line query in pop_retrieve"); |
| 548 | return (-1); |
| 549 | } |
| 550 | |
| 551 | if (pop_list (server, message, &IDs, &sizes)) |
| 552 | return (-1); |
| 553 | |
| 554 | if (pop_retrieve_first (server, message, &fromserver)) |
| 555 | { |
| 556 | return (-1); |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * The "5" below is an arbitrary constant -- I assume that if |
| 561 | * there are "From" lines in the text to be marked, there |
| 562 | * probably won't be more than 5 of them. If there are, I |
| 563 | * allocate more space for them below. |
| 564 | */ |
| 565 | bufsize = sizes[0] + (markfrom ? 5 : 0); |
| 566 | ptr = (char *)malloc (bufsize); |
| 567 | free ((char *) IDs); |
| 568 | free ((char *) sizes); |
| 569 | |
| 570 | if (! ptr) |
| 571 | { |
| 572 | strcpy (pop_error, "Out of memory in pop_retrieve"); |
| 573 | pop_retrieve_flush (server); |
| 574 | return (-1); |
| 575 | } |
| 576 | |
| 577 | while ((ret = pop_retrieve_next (server, &fromserver)) >= 0) |
| 578 | { |
| 579 | if (! fromserver) |
| 580 | { |
| 581 | ptr[cp] = '\0'; |
| 582 | *msg_buf = ptr; |
| 583 | return (cp); |
| 584 | } |
| 585 | if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' && |
| 586 | fromserver[2] == 'o' && fromserver[3] == 'm' && |
| 587 | fromserver[4] == ' ') |
| 588 | { |
| 589 | if (++fromcount == 5) |
| 590 | { |
| 591 | bufsize += 5; |
| 592 | ptr = (char *)realloc (ptr, bufsize); |
| 593 | if (! ptr) |
| 594 | { |
| 595 | strcpy (pop_error, "Out of memory in pop_retrieve"); |
| 596 | pop_retrieve_flush (server); |
| 597 | return (-1); |
| 598 | } |
| 599 | fromcount = 0; |
| 600 | } |
| 601 | ptr[cp++] = '>'; |
| 602 | } |
| 603 | memcpy (&ptr[cp], fromserver, ret); |
| 604 | cp += ret; |
| 605 | ptr[cp++] = '\n'; |
| 606 | } |
| 607 | |
| 608 | free (ptr); |
| 609 | return (-1); |
| 610 | } |
| 611 | |
| 612 | int |
| 613 | pop_retrieve_first (popserver server, int message, char **response) |
| 614 | { |
| 615 | sprintf (pop_error, "RETR %d", message); |
| 616 | return (pop_multi_first (server, pop_error, response)); |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | Returns a negative number on error, 0 to indicate that the data has |
| 621 | all been read (i.e., the server has returned a "." termination |
| 622 | line), or a positive number indicating the number of bytes in the |
| 623 | returned buffer (which is null-terminated and may contain embedded |
| 624 | nulls, but the returned bytecount doesn't include the final null). |
| 625 | */ |
| 626 | |
| 627 | int |
| 628 | pop_retrieve_next (popserver server, char **line) |
| 629 | { |
| 630 | return (pop_multi_next (server, line)); |
| 631 | } |
| 632 | |
| 633 | int |
| 634 | pop_retrieve_flush (popserver server) |
| 635 | { |
| 636 | return (pop_multi_flush (server)); |
| 637 | } |
| 638 | |
| 639 | int |
| 640 | pop_top_first (popserver server, int message, int lines, char **response) |
| 641 | { |
| 642 | sprintf (pop_error, "TOP %d %d", message, lines); |
| 643 | return (pop_multi_first (server, pop_error, response)); |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | Returns a negative number on error, 0 to indicate that the data has |
| 648 | all been read (i.e., the server has returned a "." termination |
| 649 | line), or a positive number indicating the number of bytes in the |
| 650 | returned buffer (which is null-terminated and may contain embedded |
| 651 | nulls, but the returned bytecount doesn't include the final null). |
| 652 | */ |
| 653 | |
| 654 | int |
| 655 | pop_top_next (popserver server, char **line) |
| 656 | { |
| 657 | return (pop_multi_next (server, line)); |
| 658 | } |
| 659 | |
| 660 | int |
| 661 | pop_top_flush (popserver server) |
| 662 | { |
| 663 | return (pop_multi_flush (server)); |
| 664 | } |
| 665 | |
| 666 | int |
| 667 | pop_multi_first (popserver server, const char *command, char **response) |
| 668 | { |
| 669 | if (server->in_multi) |
| 670 | { |
| 671 | strcpy (pop_error, |
| 672 | "Already in multi-line query in pop_multi_first"); |
| 673 | return (-1); |
| 674 | } |
| 675 | |
| 676 | if (sendline (server, command) || (pop_getline (server, response) < 0)) |
| 677 | { |
| 678 | return (-1); |
| 679 | } |
| 680 | |
| 681 | if (0 == strncmp (*response, "-ERR", 4)) |
| 682 | { |
| 683 | snprintf (pop_error, ERROR_MAX, "%s", *response); |
| 684 | return (-1); |
| 685 | } |
| 686 | else if (0 == strncmp (*response, "+OK", 3)) |
| 687 | { |
| 688 | for (*response += 3; **response == ' '; (*response)++) /* empty */; |
| 689 | server->in_multi = true; |
| 690 | return (0); |
| 691 | } |
| 692 | else |
| 693 | { |
| 694 | strcpy (pop_error, |
| 695 | "Unexpected response from server in pop_multi_first"); |
| 696 | return (-1); |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | Read the next line of data from SERVER and place a pointer to it |
| 702 | into LINE. Return -1 on error, 0 if there are no more lines to read |
| 703 | (i.e., the server has returned a line containing only "."), or a |
| 704 | positive number indicating the number of bytes in the LINE buffer |
| 705 | (not including the final null). The data in that buffer may contain |
| 706 | embedded nulls, but does not contain the final CRLF. When returning |
| 707 | 0, LINE is set to null. */ |
| 708 | |
| 709 | int |
| 710 | pop_multi_next (popserver server, char **line) |
| 711 | { |
| 712 | char *fromserver; |
| 713 | int ret; |
| 714 | |
| 715 | if (! server->in_multi) |
| 716 | { |
| 717 | strcpy (pop_error, "Not in multi-line query in pop_multi_next"); |
| 718 | return (-1); |
| 719 | } |
| 720 | |
| 721 | if ((ret = pop_getline (server, &fromserver)) < 0) |
| 722 | { |
| 723 | return (-1); |
| 724 | } |
| 725 | |
| 726 | if (fromserver[0] == '.') |
| 727 | { |
| 728 | if (! fromserver[1]) |
| 729 | { |
| 730 | *line = 0; |
| 731 | server->in_multi = false; |
| 732 | return (0); |
| 733 | } |
| 734 | else |
| 735 | { |
| 736 | *line = fromserver + 1; |
| 737 | return (ret - 1); |
| 738 | } |
| 739 | } |
| 740 | else |
| 741 | { |
| 742 | *line = fromserver; |
| 743 | return (ret); |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | int |
| 748 | pop_multi_flush (popserver server) |
| 749 | { |
| 750 | char *line; |
| 751 | int ret; |
| 752 | |
| 753 | if (! server->in_multi) |
| 754 | { |
| 755 | return (0); |
| 756 | } |
| 757 | |
| 758 | while ((ret = pop_multi_next (server, &line))) |
| 759 | { |
| 760 | if (ret < 0) |
| 761 | return (-1); |
| 762 | } |
| 763 | |
| 764 | return (0); |
| 765 | } |
| 766 | |
| 767 | /* Function: pop_delete |
| 768 | * |
| 769 | * Purpose: Delete a specified message. |
| 770 | * |
| 771 | * Arguments: |
| 772 | * server Server from which to delete the message. |
| 773 | * message Message to delete. |
| 774 | * |
| 775 | * Return value: 0 on success, non-zero with error in pop_error |
| 776 | * otherwise. |
| 777 | */ |
| 778 | int |
| 779 | pop_delete (popserver server, int message) |
| 780 | { |
| 781 | if (server->in_multi) |
| 782 | { |
| 783 | strcpy (pop_error, "In multi-line query in pop_delete"); |
| 784 | return (-1); |
| 785 | } |
| 786 | |
| 787 | sprintf (pop_error, "DELE %d", message); |
| 788 | |
| 789 | if (sendline (server, pop_error) || getok (server)) |
| 790 | return (-1); |
| 791 | |
| 792 | return (0); |
| 793 | } |
| 794 | |
| 795 | /* |
| 796 | * Function: pop_noop |
| 797 | * |
| 798 | * Purpose: Send a noop command to the server. |
| 799 | * |
| 800 | * Argument: |
| 801 | * server The server to send to. |
| 802 | * |
| 803 | * Return value: 0 on success, non-zero with error in pop_error |
| 804 | * otherwise. |
| 805 | * |
| 806 | * Side effects: Closes connection on error. |
| 807 | */ |
| 808 | int |
| 809 | pop_noop (popserver server) |
| 810 | { |
| 811 | if (server->in_multi) |
| 812 | { |
| 813 | strcpy (pop_error, "In multi-line query in pop_noop"); |
| 814 | return (-1); |
| 815 | } |
| 816 | |
| 817 | if (sendline (server, "NOOP") || getok (server)) |
| 818 | return (-1); |
| 819 | |
| 820 | return (0); |
| 821 | } |
| 822 | |
| 823 | /* |
| 824 | * Function: pop_last |
| 825 | * |
| 826 | * Purpose: Find out the highest seen message from the server. |
| 827 | * |
| 828 | * Arguments: |
| 829 | * server The server. |
| 830 | * |
| 831 | * Return value: If successful, the highest seen message, which is |
| 832 | * greater than or equal to 0. Otherwise, a negative number with |
| 833 | * the error explained in pop_error. |
| 834 | * |
| 835 | * Side effects: Closes the connection on error. |
| 836 | */ |
| 837 | int |
| 838 | pop_last (popserver server) |
| 839 | { |
| 840 | char *fromserver; |
| 841 | |
| 842 | if (server->in_multi) |
| 843 | { |
| 844 | strcpy (pop_error, "In multi-line query in pop_last"); |
| 845 | return (-1); |
| 846 | } |
| 847 | |
| 848 | if (sendline (server, "LAST")) |
| 849 | return (-1); |
| 850 | |
| 851 | if (pop_getline (server, &fromserver) < 0) |
| 852 | return (-1); |
| 853 | |
| 854 | if (! strncmp (fromserver, "-ERR", 4)) |
| 855 | { |
| 856 | snprintf (pop_error, ERROR_MAX, "%s", fromserver); |
| 857 | return (-1); |
| 858 | } |
| 859 | else if (strncmp (fromserver, "+OK ", 4)) |
| 860 | { |
| 861 | strcpy (pop_error, "Unexpected response from server in pop_last"); |
| 862 | pop_trash (server); |
| 863 | return (-1); |
| 864 | } |
| 865 | else |
| 866 | { |
| 867 | char *end_ptr; |
| 868 | int count; |
| 869 | errno = 0; |
| 870 | count = strtol (&fromserver[4], &end_ptr, 10); |
| 871 | if (fromserver + 4 == end_ptr || errno) |
| 872 | { |
| 873 | strcpy (pop_error, "Unexpected response from server in pop_last"); |
| 874 | pop_trash (server); |
| 875 | return (-1); |
| 876 | } |
| 877 | return count; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | /* |
| 882 | * Function: pop_reset |
| 883 | * |
| 884 | * Purpose: Reset the server to its initial connect state |
| 885 | * |
| 886 | * Arguments: |
| 887 | * server The server. |
| 888 | * |
| 889 | * Return value: 0 for success, non-0 with error in pop_error |
| 890 | * otherwise. |
| 891 | * |
| 892 | * Side effects: Closes the connection on error. |
| 893 | */ |
| 894 | int |
| 895 | pop_reset (popserver server) |
| 896 | { |
| 897 | if (pop_retrieve_flush (server)) |
| 898 | { |
| 899 | return (-1); |
| 900 | } |
| 901 | |
| 902 | if (sendline (server, "RSET") || getok (server)) |
| 903 | return (-1); |
| 904 | |
| 905 | return (0); |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Function: pop_quit |
| 910 | * |
| 911 | * Purpose: Quit the connection to the server, |
| 912 | * |
| 913 | * Arguments: |
| 914 | * server The server to quit. |
| 915 | * |
| 916 | * Return value: 0 for success, non-zero otherwise with error in |
| 917 | * pop_error. |
| 918 | * |
| 919 | * Side Effects: The popserver passed in is unusable after this |
| 920 | * function is called, even if an error occurs. |
| 921 | */ |
| 922 | int |
| 923 | pop_quit (popserver server) |
| 924 | { |
| 925 | int ret = 0; |
| 926 | |
| 927 | if (server->file >= 0) |
| 928 | { |
| 929 | if (pop_retrieve_flush (server)) |
| 930 | { |
| 931 | ret = -1; |
| 932 | } |
| 933 | |
| 934 | if (sendline (server, "QUIT") || getok (server)) |
| 935 | { |
| 936 | ret = -1; |
| 937 | } |
| 938 | |
| 939 | close (server->file); |
| 940 | } |
| 941 | |
| 942 | free (server->buffer); |
| 943 | free ((char *) server); |
| 944 | |
| 945 | return (ret); |
| 946 | } |
| 947 | |
| 948 | #ifdef WINDOWSNT |
| 949 | static int have_winsock = 0; |
| 950 | #endif |
| 951 | |
| 952 | /* |
| 953 | * Function: socket_connection |
| 954 | * |
| 955 | * Purpose: Opens the network connection with the mail host, without |
| 956 | * doing any sort of I/O with it or anything. |
| 957 | * |
| 958 | * Arguments: |
| 959 | * host The host to which to connect. |
| 960 | * flags Option flags. |
| 961 | * |
| 962 | * Return value: A file descriptor indicating the connection, or -1 |
| 963 | * indicating failure, in which case an error has been copied |
| 964 | * into pop_error. |
| 965 | */ |
| 966 | static int |
| 967 | socket_connection (char *host, int flags) |
| 968 | { |
| 969 | #ifdef HAVE_GETADDRINFO |
| 970 | struct addrinfo *res, *it; |
| 971 | struct addrinfo hints; |
| 972 | int ret; |
| 973 | #else /* !HAVE_GETADDRINFO */ |
| 974 | struct hostent *hostent; |
| 975 | #endif |
| 976 | struct servent *servent; |
| 977 | struct sockaddr_in addr; |
| 978 | char found_port = 0; |
| 979 | const char *service; |
| 980 | int sock; |
| 981 | char *realhost; |
| 982 | #ifdef KERBEROS |
| 983 | #ifdef KERBEROS5 |
| 984 | krb5_error_code rem; |
| 985 | krb5_context kcontext = 0; |
| 986 | krb5_auth_context auth_context = 0; |
| 987 | krb5_ccache ccdef; |
| 988 | krb5_principal client, server; |
| 989 | krb5_error *err_ret; |
| 990 | register char *cp; |
| 991 | #else |
| 992 | KTEXT ticket; |
| 993 | MSG_DAT msg_data; |
| 994 | CREDENTIALS cred; |
| 995 | Key_schedule schedule; |
| 996 | int rem; |
| 997 | #endif /* KERBEROS5 */ |
| 998 | #endif /* KERBEROS */ |
| 999 | |
| 1000 | int try_count = 0; |
| 1001 | int connect_ok; |
| 1002 | |
| 1003 | #ifdef WINDOWSNT |
| 1004 | { |
| 1005 | WSADATA winsockData; |
| 1006 | if (WSAStartup (0x101, &winsockData) == 0) |
| 1007 | have_winsock = 1; |
| 1008 | } |
| 1009 | #endif |
| 1010 | |
| 1011 | memset (&addr, 0, sizeof (addr)); |
| 1012 | addr.sin_family = AF_INET; |
| 1013 | |
| 1014 | /** "kpop" service is never used: look for 20060515 to see why **/ |
| 1015 | #ifdef KERBEROS |
| 1016 | service = (flags & POP_NO_KERBEROS) ? POP_SERVICE : KPOP_SERVICE; |
| 1017 | #else |
| 1018 | service = POP_SERVICE; |
| 1019 | #endif |
| 1020 | |
| 1021 | #ifdef HESIOD |
| 1022 | if (! (flags & POP_NO_HESIOD)) |
| 1023 | { |
| 1024 | servent = hes_getservbyname (service, "tcp"); |
| 1025 | if (servent) |
| 1026 | { |
| 1027 | addr.sin_port = servent->s_port; |
| 1028 | found_port = 1; |
| 1029 | } |
| 1030 | } |
| 1031 | #endif |
| 1032 | if (! found_port) |
| 1033 | { |
| 1034 | servent = getservbyname (service, "tcp"); |
| 1035 | if (servent) |
| 1036 | { |
| 1037 | addr.sin_port = servent->s_port; |
| 1038 | } |
| 1039 | else |
| 1040 | { |
| 1041 | /** "kpop" service is never used: look for 20060515 to see why **/ |
| 1042 | #ifdef KERBEROS |
| 1043 | addr.sin_port = htons ((flags & POP_NO_KERBEROS) ? |
| 1044 | POP_PORT : KPOP_PORT); |
| 1045 | #else |
| 1046 | addr.sin_port = htons (POP_PORT); |
| 1047 | #endif |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | #define POP_SOCKET_ERROR "Could not create socket for POP connection: " |
| 1052 | |
| 1053 | sock = socket (PF_INET, SOCK_STREAM, 0); |
| 1054 | if (sock < 0) |
| 1055 | { |
| 1056 | snprintf (pop_error, ERROR_MAX, "%s%s", |
| 1057 | POP_SOCKET_ERROR, strerror (errno)); |
| 1058 | return (-1); |
| 1059 | |
| 1060 | } |
| 1061 | |
| 1062 | #ifdef HAVE_GETADDRINFO |
| 1063 | memset (&hints, 0, sizeof (hints)); |
| 1064 | hints.ai_socktype = SOCK_STREAM; |
| 1065 | hints.ai_flags = AI_CANONNAME; |
| 1066 | hints.ai_family = AF_INET; |
| 1067 | do |
| 1068 | { |
| 1069 | ret = getaddrinfo (host, service, &hints, &res); |
| 1070 | try_count++; |
| 1071 | if (ret != 0 && (ret != EAI_AGAIN || try_count == 5)) |
| 1072 | { |
| 1073 | strcpy (pop_error, "Could not determine POP server's address"); |
| 1074 | return (-1); |
| 1075 | } |
| 1076 | } while (ret != 0); |
| 1077 | |
| 1078 | for (it = res; it; it = it->ai_next) |
| 1079 | if (it->ai_addrlen == sizeof addr) |
| 1080 | { |
| 1081 | struct sockaddr_in *in_a = (struct sockaddr_in *) it->ai_addr; |
| 1082 | addr.sin_addr = in_a->sin_addr; |
| 1083 | if (! connect (sock, (struct sockaddr *) &addr, sizeof addr)) |
| 1084 | break; |
| 1085 | } |
| 1086 | connect_ok = it != NULL; |
| 1087 | if (connect_ok) |
| 1088 | { |
| 1089 | realhost = alloca (strlen (it->ai_canonname) + 1); |
| 1090 | strcpy (realhost, it->ai_canonname); |
| 1091 | } |
| 1092 | freeaddrinfo (res); |
| 1093 | |
| 1094 | #else /* !HAVE_GETADDRINFO */ |
| 1095 | do |
| 1096 | { |
| 1097 | hostent = gethostbyname (host); |
| 1098 | try_count++; |
| 1099 | if ((! hostent) && ((h_errno != TRY_AGAIN) || (try_count == 5))) |
| 1100 | { |
| 1101 | strcpy (pop_error, "Could not determine POP server's address"); |
| 1102 | return (-1); |
| 1103 | } |
| 1104 | } while (! hostent); |
| 1105 | |
| 1106 | while (*hostent->h_addr_list) |
| 1107 | { |
| 1108 | memcpy (&addr.sin_addr, *hostent->h_addr_list, hostent->h_length); |
| 1109 | if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr))) |
| 1110 | break; |
| 1111 | hostent->h_addr_list++; |
| 1112 | } |
| 1113 | connect_ok = *hostent->h_addr_list != NULL; |
| 1114 | if (! connect_ok) |
| 1115 | { |
| 1116 | realhost = alloca (strlen (hostent->h_name) + 1); |
| 1117 | strcpy (realhost, hostent->h_name); |
| 1118 | } |
| 1119 | |
| 1120 | #endif /* !HAVE_GETADDRINFO */ |
| 1121 | |
| 1122 | #define CONNECT_ERROR "Could not connect to POP server: " |
| 1123 | |
| 1124 | if (! connect_ok) |
| 1125 | { |
| 1126 | CLOSESOCKET (sock); |
| 1127 | snprintf (pop_error, ERROR_MAX, "%s%s", CONNECT_ERROR, strerror (errno)); |
| 1128 | return (-1); |
| 1129 | |
| 1130 | } |
| 1131 | |
| 1132 | #ifdef KERBEROS |
| 1133 | |
| 1134 | #define KRB_ERROR "Kerberos error connecting to POP server: " |
| 1135 | if (! (flags & POP_NO_KERBEROS)) |
| 1136 | { |
| 1137 | #ifdef KERBEROS5 |
| 1138 | if ((rem = krb5_init_context (&kcontext))) |
| 1139 | { |
| 1140 | krb5error: |
| 1141 | if (auth_context) |
| 1142 | krb5_auth_con_free (kcontext, auth_context); |
| 1143 | if (kcontext) |
| 1144 | krb5_free_context (kcontext); |
| 1145 | snprintf (pop_error, ERROR_MAX, "%s%s", |
| 1146 | KRB_ERROR, error_message (rem)); |
| 1147 | CLOSESOCKET (sock); |
| 1148 | return (-1); |
| 1149 | } |
| 1150 | |
| 1151 | if ((rem = krb5_auth_con_init (kcontext, &auth_context))) |
| 1152 | goto krb5error; |
| 1153 | |
| 1154 | if (rem = krb5_cc_default (kcontext, &ccdef)) |
| 1155 | goto krb5error; |
| 1156 | |
| 1157 | if (rem = krb5_cc_get_principal (kcontext, ccdef, &client)) |
| 1158 | goto krb5error; |
| 1159 | |
| 1160 | for (cp = realhost; *cp; cp++) |
| 1161 | { |
| 1162 | if (isupper (*cp)) |
| 1163 | { |
| 1164 | *cp = tolower (*cp); |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | if (rem = krb5_sname_to_principal (kcontext, realhost, |
| 1169 | POP_SERVICE, FALSE, &server)) |
| 1170 | goto krb5error; |
| 1171 | |
| 1172 | rem = krb5_sendauth (kcontext, &auth_context, |
| 1173 | (krb5_pointer) &sock, "KPOPV1.0", client, server, |
| 1174 | AP_OPTS_MUTUAL_REQUIRED, |
| 1175 | 0, /* no checksum */ |
| 1176 | 0, /* no creds, use ccache instead */ |
| 1177 | ccdef, |
| 1178 | &err_ret, |
| 1179 | 0, /* don't need subsession key */ |
| 1180 | 0); /* don't need reply */ |
| 1181 | krb5_free_principal (kcontext, server); |
| 1182 | if (rem) |
| 1183 | { |
| 1184 | int pop_error_len = snprintf (pop_error, ERROR_MAX, "%s%s", |
| 1185 | KRB_ERROR, error_message (rem)); |
| 1186 | #if defined HAVE_KRB5_ERROR_TEXT |
| 1187 | if (err_ret && err_ret->text.length) |
| 1188 | { |
| 1189 | int errlen = err_ret->text.length; |
| 1190 | snprintf (pop_error + pop_error_len, ERROR_MAX - pop_error_len, |
| 1191 | " [server says '.*%s']", errlen, err_ret->text.data); |
| 1192 | } |
| 1193 | #elif defined HAVE_KRB5_ERROR_E_TEXT |
| 1194 | if (err_ret && err_ret->e_text && **err_ret->e_text) |
| 1195 | snprintf (pop_error + pop_error_len, ERROR_MAX - pop_error_len, |
| 1196 | " [server says '%s']", *err_ret->e_text); |
| 1197 | #endif |
| 1198 | if (err_ret) |
| 1199 | krb5_free_error (kcontext, err_ret); |
| 1200 | krb5_auth_con_free (kcontext, auth_context); |
| 1201 | krb5_free_context (kcontext); |
| 1202 | |
| 1203 | CLOSESOCKET (sock); |
| 1204 | return (-1); |
| 1205 | } |
| 1206 | #else /* ! KERBEROS5 */ |
| 1207 | ticket = (KTEXT) malloc (sizeof (KTEXT_ST)); |
| 1208 | rem = krb_sendauth (0L, sock, ticket, "pop", realhost, |
| 1209 | (char *) krb_realmofhost (realhost), |
| 1210 | (unsigned long) 0, &msg_data, &cred, schedule, |
| 1211 | (struct sockaddr_in *) 0, |
| 1212 | (struct sockaddr_in *) 0, |
| 1213 | "KPOPV0.1"); |
| 1214 | free ((char *) ticket); |
| 1215 | if (rem != KSUCCESS) |
| 1216 | { |
| 1217 | snprintf (pop_error, ERROR_MAX, "%s%s", KRB_ERROR, krb_err_txt[rem]); |
| 1218 | CLOSESOCKET (sock); |
| 1219 | return (-1); |
| 1220 | } |
| 1221 | #endif /* KERBEROS5 */ |
| 1222 | } |
| 1223 | #endif /* KERBEROS */ |
| 1224 | |
| 1225 | return (sock); |
| 1226 | } /* socket_connection */ |
| 1227 | |
| 1228 | /* |
| 1229 | * Function: pop_getline |
| 1230 | * |
| 1231 | * Purpose: Get a line of text from the connection and return a |
| 1232 | * pointer to it. The carriage return and linefeed at the end of |
| 1233 | * the line are stripped, but periods at the beginnings of lines |
| 1234 | * are NOT dealt with in any special way. |
| 1235 | * |
| 1236 | * Arguments: |
| 1237 | * server The server from which to get the line of text. |
| 1238 | * |
| 1239 | * Returns: The number of characters in the line, which is returned in |
| 1240 | * LINE, not including the final null. A return value of 0 |
| 1241 | * indicates a blank line. A negative return value indicates an |
| 1242 | * error (in which case the contents of LINE are undefined. In |
| 1243 | * case of error, an error message is copied into pop_error. |
| 1244 | * |
| 1245 | * Notes: The line returned is overwritten with each call to pop_getline. |
| 1246 | * |
| 1247 | * Side effects: Closes the connection on error. |
| 1248 | * |
| 1249 | * THE RETURNED LINE MAY CONTAIN EMBEDDED NULLS! |
| 1250 | */ |
| 1251 | static int |
| 1252 | pop_getline (popserver server, char **line) |
| 1253 | { |
| 1254 | #define GETLINE_ERROR "Error reading from server: " |
| 1255 | |
| 1256 | int ret; |
| 1257 | int search_offset = 0; |
| 1258 | |
| 1259 | if (server->data) |
| 1260 | { |
| 1261 | char *cp = find_crlf (server->buffer + server->buffer_index, |
| 1262 | server->data); |
| 1263 | if (cp) |
| 1264 | { |
| 1265 | int found; |
| 1266 | int data_used; |
| 1267 | |
| 1268 | found = server->buffer_index; |
| 1269 | data_used = (cp + 2) - server->buffer - found; |
| 1270 | |
| 1271 | *cp = '\0'; /* terminate the string to be returned */ |
| 1272 | server->data -= data_used; |
| 1273 | server->buffer_index += data_used; |
| 1274 | |
| 1275 | if (pop_debug) |
| 1276 | /* Embedded nulls will truncate this output prematurely, |
| 1277 | but that's OK because it's just for debugging anyway. */ |
| 1278 | fprintf (stderr, "<<< %s\n", server->buffer + found); |
| 1279 | *line = server->buffer + found; |
| 1280 | return (data_used - 2); |
| 1281 | } |
| 1282 | else |
| 1283 | { |
| 1284 | memmove (server->buffer, server->buffer + server->buffer_index, |
| 1285 | server->data); |
| 1286 | /* Record the fact that we've searched the data already in |
| 1287 | the buffer for a CRLF, so that when we search below, we |
| 1288 | don't have to search the same data twice. There's a "- |
| 1289 | 1" here to account for the fact that the last character |
| 1290 | of the data we have may be the CR of a CRLF pair, of |
| 1291 | which we haven't read the second half yet, so we may have |
| 1292 | to search it again when we read more data. */ |
| 1293 | search_offset = server->data - 1; |
| 1294 | server->buffer_index = 0; |
| 1295 | } |
| 1296 | } |
| 1297 | else |
| 1298 | { |
| 1299 | server->buffer_index = 0; |
| 1300 | } |
| 1301 | |
| 1302 | while (1) |
| 1303 | { |
| 1304 | /* There's a "- 1" here to leave room for the null that we put |
| 1305 | at the end of the read data below. We put the null there so |
| 1306 | that find_crlf knows where to stop when we call it. */ |
| 1307 | if (server->data == server->buffer_size - 1) |
| 1308 | { |
| 1309 | server->buffer_size += GETLINE_INCR; |
| 1310 | server->buffer = (char *)realloc (server->buffer, server->buffer_size); |
| 1311 | if (! server->buffer) |
| 1312 | { |
| 1313 | strcpy (pop_error, "Out of memory in pop_getline"); |
| 1314 | pop_trash (server); |
| 1315 | return (-1); |
| 1316 | } |
| 1317 | } |
| 1318 | ret = RECV (server->file, server->buffer + server->data, |
| 1319 | server->buffer_size - server->data - 1, 0); |
| 1320 | if (ret < 0) |
| 1321 | { |
| 1322 | snprintf (pop_error, ERROR_MAX, "%s%s", |
| 1323 | GETLINE_ERROR, strerror (errno)); |
| 1324 | pop_trash (server); |
| 1325 | return (-1); |
| 1326 | } |
| 1327 | else if (ret == 0) |
| 1328 | { |
| 1329 | strcpy (pop_error, "Unexpected EOF from server in pop_getline"); |
| 1330 | pop_trash (server); |
| 1331 | return (-1); |
| 1332 | } |
| 1333 | else |
| 1334 | { |
| 1335 | char *cp; |
| 1336 | server->data += ret; |
| 1337 | server->buffer[server->data] = '\0'; |
| 1338 | |
| 1339 | cp = find_crlf (server->buffer + search_offset, |
| 1340 | server->data - search_offset); |
| 1341 | if (cp) |
| 1342 | { |
| 1343 | int data_used = (cp + 2) - server->buffer; |
| 1344 | *cp = '\0'; |
| 1345 | server->data -= data_used; |
| 1346 | server->buffer_index = data_used; |
| 1347 | |
| 1348 | if (pop_debug) |
| 1349 | fprintf (stderr, "<<< %s\n", server->buffer); |
| 1350 | *line = server->buffer; |
| 1351 | return (data_used - 2); |
| 1352 | } |
| 1353 | /* As above, the "- 1" here is to account for the fact that |
| 1354 | we may have read a CR without its accompanying LF. */ |
| 1355 | search_offset += ret - 1; |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | /* NOTREACHED */ |
| 1360 | } |
| 1361 | |
| 1362 | /* |
| 1363 | * Function: sendline |
| 1364 | * |
| 1365 | * Purpose: Sends a line of text to the POP server. The line of text |
| 1366 | * passed into this function should NOT have the carriage return |
| 1367 | * and linefeed on the end of it. Periods at beginnings of lines |
| 1368 | * will NOT be treated specially by this function. |
| 1369 | * |
| 1370 | * Arguments: |
| 1371 | * server The server to which to send the text. |
| 1372 | * line The line of text to send. |
| 1373 | * |
| 1374 | * Return value: Upon successful completion, a value of 0 will be |
| 1375 | * returned. Otherwise, a non-zero value will be returned, and |
| 1376 | * an error will be copied into pop_error. |
| 1377 | * |
| 1378 | * Side effects: Closes the connection on error. |
| 1379 | */ |
| 1380 | static int |
| 1381 | sendline (popserver server, const char *line) |
| 1382 | { |
| 1383 | #define SENDLINE_ERROR "Error writing to POP server: " |
| 1384 | int ret; |
| 1385 | char *buf; |
| 1386 | |
| 1387 | /* Combine the string and the CR-LF into one buffer. Otherwise, two |
| 1388 | reasonable network stack optimizations, Nagle's algorithm and |
| 1389 | delayed acks, combine to delay us a fraction of a second on every |
| 1390 | message we send. (Movemail writes line without \r\n, client |
| 1391 | kernel sends packet, server kernel delays the ack to see if it |
| 1392 | can combine it with data, movemail writes \r\n, client kernel |
| 1393 | waits because it has unacked data already in its outgoing queue, |
| 1394 | client kernel eventually times out and sends.) |
| 1395 | |
| 1396 | This can be something like 0.2s per command, which can add up |
| 1397 | over a few dozen messages, and is a big chunk of the time we |
| 1398 | spend fetching mail from a server close by. */ |
| 1399 | buf = alloca (strlen (line) + 3); |
| 1400 | strcpy (buf, line); |
| 1401 | strcat (buf, "\r\n"); |
| 1402 | ret = fullwrite (server->file, buf, strlen (buf)); |
| 1403 | |
| 1404 | if (ret < 0) |
| 1405 | { |
| 1406 | pop_trash (server); |
| 1407 | snprintf (pop_error, ERROR_MAX, "%s%s", SENDLINE_ERROR, strerror (errno)); |
| 1408 | return (ret); |
| 1409 | } |
| 1410 | |
| 1411 | if (pop_debug) |
| 1412 | fprintf (stderr, ">>> %s\n", line); |
| 1413 | |
| 1414 | return (0); |
| 1415 | } |
| 1416 | |
| 1417 | /* |
| 1418 | * Procedure: fullwrite |
| 1419 | * |
| 1420 | * Purpose: Just like write, but keeps trying until the entire string |
| 1421 | * has been written. |
| 1422 | * |
| 1423 | * Return value: Same as write. Pop_error is not set. |
| 1424 | */ |
| 1425 | static int |
| 1426 | fullwrite (int fd, char *buf, int nbytes) |
| 1427 | { |
| 1428 | char *cp; |
| 1429 | int ret = 0; |
| 1430 | |
| 1431 | cp = buf; |
| 1432 | while (nbytes && ((ret = SEND (fd, cp, nbytes, 0)) > 0)) |
| 1433 | { |
| 1434 | cp += ret; |
| 1435 | nbytes -= ret; |
| 1436 | } |
| 1437 | |
| 1438 | return (ret); |
| 1439 | } |
| 1440 | |
| 1441 | /* |
| 1442 | * Procedure getok |
| 1443 | * |
| 1444 | * Purpose: Reads a line from the server. If the return indicator is |
| 1445 | * positive, return with a zero exit status. If not, return with |
| 1446 | * a negative exit status. |
| 1447 | * |
| 1448 | * Arguments: |
| 1449 | * server The server to read from. |
| 1450 | * |
| 1451 | * Returns: 0 for success, else for failure and puts error in pop_error. |
| 1452 | * |
| 1453 | * Side effects: On failure, may make the connection unusable. |
| 1454 | */ |
| 1455 | static int |
| 1456 | getok (popserver server) |
| 1457 | { |
| 1458 | char *fromline; |
| 1459 | |
| 1460 | if (pop_getline (server, &fromline) < 0) |
| 1461 | { |
| 1462 | return (-1); |
| 1463 | } |
| 1464 | |
| 1465 | if (! strncmp (fromline, "+OK", 3)) |
| 1466 | return (0); |
| 1467 | else if (! strncmp (fromline, "-ERR", 4)) |
| 1468 | { |
| 1469 | snprintf (pop_error, ERROR_MAX, "%s", fromline); |
| 1470 | return (-1); |
| 1471 | } |
| 1472 | else |
| 1473 | { |
| 1474 | strcpy (pop_error, |
| 1475 | "Unexpected response from server; expecting +OK or -ERR"); |
| 1476 | pop_trash (server); |
| 1477 | return (-1); |
| 1478 | } |
| 1479 | } |
| 1480 | |
| 1481 | #if 0 |
| 1482 | /* |
| 1483 | * Function: gettermination |
| 1484 | * |
| 1485 | * Purpose: Gets the next line and verifies that it is a termination |
| 1486 | * line (nothing but a dot). |
| 1487 | * |
| 1488 | * Return value: 0 on success, non-zero with pop_error set on error. |
| 1489 | * |
| 1490 | * Side effects: Closes the connection on error. |
| 1491 | */ |
| 1492 | static int |
| 1493 | gettermination (server) |
| 1494 | popserver server; |
| 1495 | { |
| 1496 | char *fromserver; |
| 1497 | |
| 1498 | if (pop_getline (server, &fromserver) < 0) |
| 1499 | return (-1); |
| 1500 | |
| 1501 | if (strcmp (fromserver, ".")) |
| 1502 | { |
| 1503 | strcpy (pop_error, |
| 1504 | "Unexpected response from server in gettermination"); |
| 1505 | pop_trash (server); |
| 1506 | return (-1); |
| 1507 | } |
| 1508 | |
| 1509 | return (0); |
| 1510 | } |
| 1511 | #endif |
| 1512 | |
| 1513 | /* |
| 1514 | * Function pop_close |
| 1515 | * |
| 1516 | * Purpose: Close a pop connection, sending a "RSET" command to try to |
| 1517 | * preserve any changes that were made and a "QUIT" command to |
| 1518 | * try to get the server to quit, but ignoring any responses that |
| 1519 | * are received. |
| 1520 | * |
| 1521 | * Side effects: The server is unusable after this function returns. |
| 1522 | * Changes made to the maildrop since the session was started (or |
| 1523 | * since the last pop_reset) may be lost. |
| 1524 | */ |
| 1525 | void |
| 1526 | pop_close (popserver server) |
| 1527 | { |
| 1528 | pop_trash (server); |
| 1529 | free ((char *) server); |
| 1530 | |
| 1531 | return; |
| 1532 | } |
| 1533 | |
| 1534 | /* |
| 1535 | * Function: pop_trash |
| 1536 | * |
| 1537 | * Purpose: Like pop_close or pop_quit, but doesn't deallocate the |
| 1538 | * memory associated with the server. It is valid to call |
| 1539 | * pop_close or pop_quit after this function has been called. |
| 1540 | */ |
| 1541 | static void |
| 1542 | pop_trash (popserver server) |
| 1543 | { |
| 1544 | if (server->file >= 0) |
| 1545 | { |
| 1546 | /* avoid recursion; sendline can call pop_trash */ |
| 1547 | if (server->trash_started) |
| 1548 | return; |
| 1549 | server->trash_started = true; |
| 1550 | |
| 1551 | sendline (server, "RSET"); |
| 1552 | sendline (server, "QUIT"); |
| 1553 | |
| 1554 | CLOSESOCKET (server->file); |
| 1555 | server->file = -1; |
| 1556 | if (server->buffer) |
| 1557 | { |
| 1558 | free (server->buffer); |
| 1559 | server->buffer = 0; |
| 1560 | } |
| 1561 | } |
| 1562 | |
| 1563 | #ifdef WINDOWSNT |
| 1564 | if (have_winsock) |
| 1565 | WSACleanup (); |
| 1566 | #endif |
| 1567 | } |
| 1568 | |
| 1569 | /* Return a pointer to the first CRLF in IN_STRING, which can contain |
| 1570 | embedded nulls and has LEN characters in it not including the final |
| 1571 | null, or 0 if it does not contain one. */ |
| 1572 | |
| 1573 | static char * |
| 1574 | find_crlf (char *in_string, int len) |
| 1575 | { |
| 1576 | while (len--) |
| 1577 | { |
| 1578 | if (*in_string == '\r') |
| 1579 | { |
| 1580 | if (*++in_string == '\n') |
| 1581 | return (in_string - 1); |
| 1582 | } |
| 1583 | else |
| 1584 | in_string++; |
| 1585 | } |
| 1586 | return (0); |
| 1587 | } |
| 1588 | |
| 1589 | #endif /* MAIL_USE_POP */ |