Mercurial > hg > xemacs-beta
annotate lib-src/pop.c @ 5891:a0e751d6c3ad
Import the #'clear-string API from GNU, use it in tls.c
src/ChangeLog addition:
2015-04-18 Aidan Kehoe <kehoea@parhasard.net>
* sequence.c (Fclear_string): New, API from GNU. Zero a string's
contents, making sure the text is not kept around even when the
string's data is reallocated because of a changed character
length.
* sequence.c (syms_of_sequence): Make it available to Lisp.
* lisp.h: Make it available to C code.
* tls.c (nss_pk11_password): Use it.
* tls.c (gnutls_pk11_password): Use it.
* tls.c (openssl_password): Use it.
tests/ChangeLog addition:
2015-04-18 Aidan Kehoe <kehoea@parhasard.net>
* automated/lisp-tests.el:
Test #'clear-string, just added. Unfortunately there's no way to
be certain from Lisp that the old password data has been erased
after realloc; it may be worth adding a test to tests.c, but
*we'll be reading memory we shouldn't be*, so that gives me pause.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Sat, 18 Apr 2015 23:00:14 +0100 |
| parents | 7984e732829e |
| children | 574f0cded429 |
| rev | line source |
|---|---|
| 428 | 1 /* pop.c: client routines for talking to a POP3-protocol post-office server |
| 3650 | 2 Copyright (C) 1991, 1993, 1996, 1997, 1999, 2002, 2003, 2004, |
| 3 2005, 2006 Free Software Foundation, Inc. | |
| 771 | 4 Copyright (C) 2001 Ben Wing. |
| 428 | 5 Written by Jonathan Kamens, jik@security.ov.com. |
| 6 | |
| 613 | 7 This file is part of XEmacs. |
| 428 | 8 |
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9 XEmacs is free software: you can redistribute it and/or modify it |
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10 under the terms of the GNU General Public License as published by the |
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11 Free Software Foundation, either version 3 of the License, or (at your |
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12 option) any later version. |
| 428 | 13 |
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14 XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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17 for more details. |
| 428 | 18 |
| 19 You should have received a copy of the GNU General Public License | |
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20 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 3650 | 21 |
| 22 /* Synched up with: FSF 22.0.50. */ | |
| 428 | 23 |
| 24 #ifdef HAVE_CONFIG_H | |
| 25 #define NO_SHORTNAMES /* Tell config not to load remap.h */ | |
| 438 | 26 #include <config.h> |
| 428 | 27 #else |
| 28 #define MAIL_USE_POP | |
| 29 #endif | |
| 30 | |
| 31 #ifdef MAIL_USE_POP | |
| 32 | |
| 33 #include <sys/types.h> | |
| 442 | 34 #ifdef WIN32_NATIVE |
| 428 | 35 #include <winsock.h> |
| 36 #undef SOCKET_ERROR | |
| 37 #define RECV(s,buf,len,flags) recv(s,buf,len,flags) | |
| 38 #define SEND(s,buf,len,flags) send(s,buf,len,flags) | |
| 39 #define CLOSESOCKET(s) closesocket(s) | |
| 40 #else | |
| 41 #include <netinet/in.h> | |
| 42 #include <sys/socket.h> | |
| 43 #define RECV(s,buf,len,flags) read(s,buf,len) | |
| 44 #define SEND(s,buf,len,flags) write(s,buf,len) | |
| 45 #define CLOSESOCKET(s) close(s) | |
| 46 #endif | |
| 47 #include "pop.h" | |
| 2286 | 48 #include "compiler.h" |
| 428 | 49 |
| 50 #ifdef sun | |
| 51 #include <malloc.h> | |
| 52 #endif /* sun */ | |
| 53 | |
| 54 #ifdef HESIOD | |
| 55 #include <hesiod.h> | |
| 56 /* | |
| 57 * It really shouldn't be necessary to put this declaration here, but | |
| 58 * the version of hesiod.h that Athena has installed in release 7.2 | |
| 59 * doesn't declare this function; I don't know if the 7.3 version of | |
| 60 * hesiod.h does. | |
| 61 */ | |
| 62 extern struct servent *hes_getservbyname (/* char *, char * */); | |
| 63 #endif | |
| 64 | |
| 442 | 65 #include "../src/syspwd.h" |
| 66 #ifndef WIN32_NATIVE | |
| 428 | 67 #include <netdb.h> |
| 442 | 68 #endif |
| 428 | 69 #include <errno.h> |
| 70 #include <stdio.h> | |
| 71 | |
| 442 | 72 #ifdef HAVE_UNISTD_H |
| 428 | 73 #include <unistd.h> |
| 442 | 74 #endif |
| 428 | 75 #include <sys/stat.h> |
| 442 | 76 #ifndef WIN32_NATIVE |
| 428 | 77 #include <sys/file.h> |
| 442 | 78 #endif |
| 428 | 79 #include "../src/syswait.h" |
| 442 | 80 #ifndef WIN32_NATIVE |
| 428 | 81 #include "../src/systime.h" |
| 82 #endif | |
| 83 #include <stdlib.h> | |
| 84 #include <string.h> | |
| 85 | |
| 86 #ifdef KERBEROS | |
| 87 #ifndef KRB5 | |
| 88 #include <des.h> | |
| 89 #include <krb.h> | |
| 90 #else /* KRB5 */ | |
| 91 #include <krb5/krb5.h> | |
| 92 #include <krb5/ext-proto.h> | |
| 93 #include <ctype.h> | |
| 94 #endif /* KRB5 */ | |
| 95 #endif /* KERBEROS */ | |
| 96 | |
| 97 #ifdef KERBEROS | |
| 98 #ifndef KRB5 | |
| 99 extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *, | |
| 3650 | 100 u_long, MSG_DAT *, CREDENTIALS *, Key_schedule, |
| 428 | 101 struct sockaddr_in *, struct sockaddr_in *, |
| 102 char * */); | |
| 103 extern char *krb_realmofhost (/* char * */); | |
| 104 #endif /* ! KRB5 */ | |
| 105 #endif /* KERBEROS */ | |
| 106 | |
| 442 | 107 #ifndef WIN32_NATIVE |
| 428 | 108 #if !defined(HAVE_H_ERRNO) || !defined(HAVE_CONFIG_H) |
| 109 extern int h_errno; | |
| 110 #endif | |
| 111 #endif | |
| 112 | |
| 113 static int socket_connection (char *, int); | |
| 3650 | 114 static int pop_getline (popserver, char **); |
| 428 | 115 static int sendline (popserver, char *); |
| 116 static int fullwrite (int, char *, int); | |
| 117 static int getok (popserver); | |
| 118 #if 0 | |
| 119 static int gettermination (popserver); | |
| 120 #endif | |
| 121 static void pop_trash (popserver); | |
| 3650 | 122 static char *find_crlf (char *, int); |
| 428 | 123 |
| 3650 | 124 #define ERROR_MAX 160 /* a pretty arbitrary size, but needs |
| 125 to be bigger than the original | |
| 126 value of 80 */ | |
| 428 | 127 #define POP_PORT 110 |
| 128 #define KPOP_PORT 1109 | |
| 442 | 129 #if defined(WIN32_NATIVE) || defined(CYGWIN) |
| 428 | 130 #define POP_SERVICE "pop3" /* we don't want the POP2 port! */ |
| 131 #else | |
| 132 #define POP_SERVICE "pop" | |
| 133 #endif | |
| 134 #ifdef KERBEROS | |
| 135 #ifdef KRB5 | |
| 3650 | 136 #define KPOP_SERVICE "k5pop" |
| 428 | 137 #else |
| 138 #define KPOP_SERVICE "kpop" | |
| 139 #endif | |
| 140 #endif | |
| 141 | |
| 142 char pop_error[ERROR_MAX]; | |
| 143 int pop_debug = 0; | |
| 144 | |
| 145 #ifndef min | |
| 146 #define min(a,b) (((a) < (b)) ? (a) : (b)) | |
| 147 #endif | |
| 148 | |
| 149 /* | |
| 150 * Function: pop_open (char *host, char *username, char *password, | |
| 151 * int flags) | |
| 152 * | |
| 153 * Purpose: Establishes a connection with a post-office server, and | |
| 154 * completes the authorization portion of the session. | |
| 155 * | |
| 156 * Arguments: | |
| 157 * host The server host with which the connection should be | |
| 158 * established. Optional. If omitted, internal | |
| 159 * heuristics will be used to determine the server host, | |
| 160 * if possible. | |
| 161 * username | |
| 162 * The username of the mail-drop to access. Optional. | |
| 163 * If omitted, internal heuristics will be used to | |
| 164 * determine the username, if possible. | |
| 165 * password | |
| 166 * The password to use for authorization. If omitted, | |
| 167 * internal heuristics will be used to determine the | |
| 168 * password, if possible. | |
| 169 * flags A bit mask containing flags controlling certain | |
| 170 * functions of the routine. Valid flags are defined in | |
| 171 * the file pop.h | |
| 172 * | |
| 173 * Return value: Upon successful establishment of a connection, a | |
| 174 * non-null popserver will be returned. Otherwise, null will be | |
| 175 * returned, and the string variable pop_error will contain an | |
| 176 * explanation of the error. | |
| 177 */ | |
| 178 popserver | |
| 179 pop_open (char *host, char *username, char *password, int flags) | |
| 180 { | |
| 181 int sock; | |
| 182 popserver server; | |
| 183 | |
| 184 /* Determine the user name */ | |
| 185 if (! username) | |
| 186 { | |
| 187 username = getenv ("USER"); | |
| 188 if (! (username && *username)) | |
| 189 { | |
| 442 | 190 #ifndef WIN32_NATIVE |
| 428 | 191 username = getlogin (); |
| 192 if (! (username && *username)) | |
| 193 { | |
| 194 struct passwd *passwd; | |
| 195 passwd = getpwuid (getuid ()); | |
| 196 if (passwd && passwd->pw_name && *passwd->pw_name) | |
| 197 { | |
| 198 username = passwd->pw_name; | |
| 199 } | |
| 200 else | |
| 201 { | |
| 202 strcpy (pop_error, "Could not determine username"); | |
| 203 return (0); | |
| 204 } | |
| 205 } | |
| 206 #else | |
| 207 strcpy (pop_error, "Could not determine username"); | |
| 208 return (0); | |
| 209 #endif | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 /* | |
| 214 * Determine the mail host. | |
| 215 */ | |
| 216 | |
| 217 if (! host) | |
| 218 { | |
| 219 host = getenv ("MAILHOST"); | |
| 220 } | |
| 221 | |
| 222 #ifdef HESIOD | |
| 223 if ((! host) && (! (flags & POP_NO_HESIOD))) | |
| 224 { | |
| 225 struct hes_postoffice *office; | |
| 226 office = hes_getmailhost (username); | |
| 227 if (office && office->po_type && (! strcmp (office->po_type, "POP")) | |
| 228 && office->po_name && *office->po_name && office->po_host | |
| 229 && *office->po_host) | |
| 230 { | |
| 231 host = office->po_host; | |
| 232 username = office->po_name; | |
| 233 } | |
| 234 } | |
| 235 #endif | |
| 236 | |
| 237 #ifdef MAILHOST | |
| 238 if (! host) | |
| 239 { | |
| 240 host = MAILHOST; | |
| 241 } | |
| 242 #endif | |
| 243 | |
| 244 if (! host) | |
| 245 { | |
| 246 strcpy (pop_error, "Could not determine POP server"); | |
| 247 return (0); | |
| 248 } | |
| 249 | |
| 250 /* Determine the password */ | |
| 251 #ifdef KERBEROS | |
| 252 #define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS)) | |
| 253 #else | |
| 254 #define DONT_NEED_PASSWORD 0 | |
| 255 #endif | |
| 256 | |
| 257 if ((! password) && (! DONT_NEED_PASSWORD)) | |
| 258 { | |
| 442 | 259 #ifndef WIN32_NATIVE |
| 428 | 260 if (! (flags & POP_NO_GETPASS)) |
| 261 { | |
| 262 password = getpass ("Enter POP password:"); | |
| 263 } | |
| 264 #endif | |
| 265 if (! password) | |
| 266 { | |
| 267 strcpy (pop_error, "Could not determine POP password"); | |
| 268 return (0); | |
| 269 } | |
| 270 } | |
| 271 if (password) | |
| 272 flags |= POP_NO_KERBEROS; | |
| 273 else | |
| 274 password = username; | |
| 275 | |
| 276 sock = socket_connection (host, flags); | |
| 277 if (sock == -1) | |
| 278 return (0); | |
| 279 | |
| 280 server = (popserver) malloc (sizeof (struct _popserver)); | |
| 281 if (! server) | |
| 282 { | |
| 283 strcpy (pop_error, "Out of memory in pop_open"); | |
| 284 return (0); | |
| 285 } | |
| 286 server->buffer = (char *) malloc (GETLINE_MIN); | |
| 287 if (! server->buffer) | |
| 288 { | |
| 289 strcpy (pop_error, "Out of memory in pop_open"); | |
| 290 free ((char *) server); | |
| 291 return (0); | |
| 292 } | |
| 293 | |
| 294 server->file = sock; | |
| 295 server->data = 0; | |
| 296 server->buffer_index = 0; | |
| 297 server->buffer_size = GETLINE_MIN; | |
| 298 server->in_multi = 0; | |
| 299 server->trash_started = 0; | |
| 300 | |
| 301 if (getok (server)) | |
| 302 return (0); | |
| 303 | |
| 304 /* | |
| 305 * I really shouldn't use the pop_error variable like this, but.... | |
| 306 */ | |
| 307 if (strlen (username) > ERROR_MAX - 6) | |
| 308 { | |
| 309 pop_close (server); | |
| 310 strcpy (pop_error, | |
| 311 "Username too long; recompile pop.c with larger ERROR_MAX"); | |
| 312 return (0); | |
| 313 } | |
| 314 sprintf (pop_error, "USER %s", username); | |
| 315 | |
| 316 if (sendline (server, pop_error) || getok (server)) | |
| 317 { | |
| 318 return (0); | |
| 319 } | |
| 320 | |
| 321 if (strlen (password) > ERROR_MAX - 6) | |
| 322 { | |
| 323 pop_close (server); | |
| 324 strcpy (pop_error, | |
| 325 "Password too long; recompile pop.c with larger ERROR_MAX"); | |
| 326 return (0); | |
| 327 } | |
| 328 sprintf (pop_error, "PASS %s", password); | |
| 329 | |
| 330 if (sendline (server, pop_error) || getok (server)) | |
| 331 { | |
| 332 return (0); | |
| 333 } | |
| 334 | |
| 335 return (server); | |
| 336 } | |
| 337 | |
| 338 /* | |
| 339 * Function: pop_stat | |
| 340 * | |
| 341 * Purpose: Issue the STAT command to the server and return (in the | |
| 342 * value parameters) the number of messages in the maildrop and | |
| 343 * the total size of the maildrop. | |
| 344 * | |
| 345 * Return value: 0 on success, or non-zero with an error in pop_error | |
| 346 * in failure. | |
| 347 * | |
| 348 * Side effects: On failure, may make further operations on the | |
| 349 * connection impossible. | |
| 350 */ | |
| 351 int | |
| 352 pop_stat (popserver server, int *count, int *size) | |
| 353 { | |
| 354 char *fromserver; | |
| 355 | |
| 356 if (server->in_multi) | |
| 357 { | |
| 358 strcpy (pop_error, "In multi-line query in pop_stat"); | |
| 359 return (-1); | |
| 360 } | |
| 361 | |
| 3650 | 362 if (sendline (server, "STAT") || (pop_getline (server, &fromserver) < 0)) |
| 428 | 363 return (-1); |
| 364 | |
| 365 if (strncmp (fromserver, "+OK ", 4)) | |
| 366 { | |
| 367 if (0 == strncmp (fromserver, "-ERR", 4)) | |
| 368 { | |
| 369 strncpy (pop_error, fromserver, ERROR_MAX); | |
| 370 } | |
| 371 else | |
| 372 { | |
| 373 strcpy (pop_error, | |
| 374 "Unexpected response from POP server in pop_stat"); | |
| 375 pop_trash (server); | |
| 376 } | |
| 377 return (-1); | |
| 378 } | |
| 379 | |
| 380 *count = atoi (&fromserver[4]); | |
| 381 | |
| 382 fromserver = strchr (&fromserver[4], ' '); | |
| 383 if (! fromserver) | |
| 384 { | |
| 385 strcpy (pop_error, | |
| 386 "Badly formatted response from server in pop_stat"); | |
| 387 pop_trash (server); | |
| 388 return (-1); | |
| 389 } | |
| 390 | |
| 391 *size = atoi (fromserver + 1); | |
| 392 | |
| 393 return (0); | |
| 394 } | |
| 395 | |
| 396 /* | |
| 397 * Function: pop_list | |
| 398 * | |
| 399 * Purpose: Performs the POP "list" command and returns (in value | |
| 400 * parameters) two malloc'd zero-terminated arrays -- one of | |
| 401 * message IDs, and a parallel one of sizes. | |
| 402 * | |
| 403 * Arguments: | |
| 404 * server The pop connection to talk to. | |
| 405 * message The number of the one message about which to get | |
| 406 * information, or 0 to get information about all | |
| 407 * messages. | |
| 408 * | |
| 409 * Return value: 0 on success, non-zero with error in pop_error on | |
| 410 * failure. | |
| 411 * | |
| 412 * Side effects: On failure, may make further operations on the | |
| 413 * connection impossible. | |
| 414 */ | |
| 415 int | |
| 416 pop_list (popserver server, int message, int **IDs, int **sizes) | |
| 417 { | |
| 418 int how_many, i; | |
| 419 char *fromserver; | |
| 420 | |
| 421 if (server->in_multi) | |
| 422 { | |
| 423 strcpy (pop_error, "In multi-line query in pop_list"); | |
| 424 return (-1); | |
| 425 } | |
| 426 | |
| 427 if (message) | |
| 428 how_many = 1; | |
| 429 else | |
| 430 { | |
| 431 int count, size; | |
| 432 if (pop_stat (server, &count, &size)) | |
| 433 return (-1); | |
| 434 how_many = count; | |
| 435 } | |
| 436 | |
| 437 *IDs = (int *) malloc ((how_many + 1) * sizeof (int)); | |
| 438 *sizes = (int *) malloc ((how_many + 1) * sizeof (int)); | |
| 439 if (! (*IDs && *sizes)) | |
| 440 { | |
| 441 strcpy (pop_error, "Out of memory in pop_list"); | |
| 442 return (-1); | |
| 443 } | |
| 444 | |
| 445 if (message) | |
| 446 { | |
| 447 sprintf (pop_error, "LIST %d", message); | |
| 448 if (sendline (server, pop_error)) | |
| 449 { | |
| 450 free ((char *) *IDs); | |
| 451 free ((char *) *sizes); | |
| 452 return (-1); | |
| 453 } | |
| 3650 | 454 if (pop_getline (server, &fromserver) < 0) |
| 428 | 455 { |
| 456 free ((char *) *IDs); | |
| 457 free ((char *) *sizes); | |
| 458 return (-1); | |
| 459 } | |
| 460 if (strncmp (fromserver, "+OK ", 4)) | |
| 461 { | |
| 462 if (! strncmp (fromserver, "-ERR", 4)) | |
| 463 strncpy (pop_error, fromserver, ERROR_MAX); | |
| 464 else | |
| 465 { | |
| 466 strcpy (pop_error, | |
| 467 "Unexpected response from server in pop_list"); | |
| 468 pop_trash (server); | |
| 469 } | |
| 470 free ((char *) *IDs); | |
| 471 free ((char *) *sizes); | |
| 472 return (-1); | |
| 473 } | |
| 474 (*IDs)[0] = atoi (&fromserver[4]); | |
| 475 fromserver = strchr (&fromserver[4], ' '); | |
| 476 if (! fromserver) | |
| 477 { | |
| 478 strcpy (pop_error, | |
| 479 "Badly formatted response from server in pop_list"); | |
| 480 pop_trash (server); | |
| 481 free ((char *) *IDs); | |
| 482 free ((char *) *sizes); | |
| 483 return (-1); | |
| 484 } | |
| 485 (*sizes)[0] = atoi (fromserver); | |
| 486 (*IDs)[1] = (*sizes)[1] = 0; | |
| 487 return (0); | |
| 488 } | |
| 489 else | |
| 490 { | |
| 491 if (pop_multi_first (server, "LIST", &fromserver)) | |
| 492 { | |
| 493 free ((char *) *IDs); | |
| 494 free ((char *) *sizes); | |
| 495 return (-1); | |
| 496 } | |
| 497 for (i = 0; i < how_many; i++) | |
| 498 { | |
| 3650 | 499 if (pop_multi_next (server, &fromserver) <= 0) |
| 428 | 500 { |
| 501 free ((char *) *IDs); | |
| 502 free ((char *) *sizes); | |
| 503 return (-1); | |
| 504 } | |
| 505 (*IDs)[i] = atoi (fromserver); | |
| 506 fromserver = strchr (fromserver, ' '); | |
| 507 if (! fromserver) | |
| 508 { | |
| 509 strcpy (pop_error, | |
| 510 "Badly formatted response from server in pop_list"); | |
| 511 free ((char *) *IDs); | |
| 512 free ((char *) *sizes); | |
| 513 pop_trash (server); | |
| 514 return (-1); | |
| 515 } | |
| 516 (*sizes)[i] = atoi (fromserver); | |
| 517 } | |
| 3650 | 518 if (pop_multi_next (server, &fromserver) < 0) |
| 428 | 519 { |
| 520 free ((char *) *IDs); | |
| 521 free ((char *) *sizes); | |
| 522 return (-1); | |
| 523 } | |
| 524 else if (fromserver) | |
| 525 { | |
| 526 strcpy (pop_error, | |
| 527 "Too many response lines from server in pop_list"); | |
| 528 free ((char *) *IDs); | |
| 529 free ((char *) *sizes); | |
| 530 return (-1); | |
| 531 } | |
| 532 (*IDs)[i] = (*sizes)[i] = 0; | |
| 533 return (0); | |
| 534 } | |
| 535 } | |
| 536 | |
| 537 /* | |
| 538 * Function: pop_retrieve | |
| 539 * | |
| 540 * Purpose: Retrieve a specified message from the maildrop. | |
| 541 * | |
| 542 * Arguments: | |
| 543 * server The server to retrieve from. | |
| 544 * message The message number to retrieve. | |
| 545 * markfrom | |
| 546 * If true, then mark the string "From " at the beginning | |
| 547 * of lines with '>'. | |
| 3650 | 548 * msg_buf Output parameter to which a buffer containing the |
| 549 * message is assigned. | |
| 428 | 550 * |
| 3650 | 551 * Return value: The number of bytes in msg_buf, which may contain |
| 552 * embedded nulls, not including its final null, or -1 on error | |
| 553 * with pop_error set. | |
| 428 | 554 * |
| 555 * Side effects: May kill connection on error. | |
| 556 */ | |
| 3650 | 557 int |
| 558 pop_retrieve (popserver server, int message, int markfrom, char **msg_buf) | |
| 428 | 559 { |
| 560 int *IDs, *sizes, bufsize, fromcount = 0, cp = 0; | |
| 561 char *ptr, *fromserver; | |
| 562 int ret; | |
| 563 | |
| 564 if (server->in_multi) | |
| 565 { | |
| 566 strcpy (pop_error, "In multi-line query in pop_retrieve"); | |
| 567 return (0); | |
| 568 } | |
| 569 | |
| 570 if (pop_list (server, message, &IDs, &sizes)) | |
| 3650 | 571 return (-1); |
| 428 | 572 |
| 573 if (pop_retrieve_first (server, message, &fromserver)) | |
| 574 { | |
| 3650 | 575 return (-1); |
| 428 | 576 } |
| 577 | |
| 578 /* | |
| 579 * The "5" below is an arbitrary constant -- I assume that if | |
| 580 * there are "From" lines in the text to be marked, there | |
| 581 * probably won't be more than 5 of them. If there are, I | |
| 582 * allocate more space for them below. | |
| 583 */ | |
| 584 bufsize = sizes[0] + (markfrom ? 5 : 0); | |
| 585 ptr = (char *)malloc (bufsize); | |
| 586 free ((char *) IDs); | |
| 587 free ((char *) sizes); | |
| 588 | |
| 589 if (! ptr) | |
| 590 { | |
| 591 strcpy (pop_error, "Out of memory in pop_retrieve"); | |
| 592 pop_retrieve_flush (server); | |
| 3650 | 593 return (-1); |
| 428 | 594 } |
| 595 | |
| 3650 | 596 while ((ret = pop_retrieve_next (server, &fromserver)) >= 0) |
| 428 | 597 { |
| 598 if (! fromserver) | |
| 599 { | |
| 600 ptr[cp] = '\0'; | |
| 3650 | 601 *msg_buf = ptr; |
| 602 return (cp); | |
| 428 | 603 } |
| 604 if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' && | |
| 605 fromserver[2] == 'o' && fromserver[3] == 'm' && | |
| 606 fromserver[4] == ' ') | |
| 607 { | |
| 608 if (++fromcount == 5) | |
| 609 { | |
| 610 bufsize += 5; | |
| 611 ptr = (char *)realloc (ptr, bufsize); | |
| 612 if (! ptr) | |
| 613 { | |
| 614 strcpy (pop_error, "Out of memory in pop_retrieve"); | |
| 615 pop_retrieve_flush (server); | |
| 3650 | 616 return (-1); |
| 428 | 617 } |
| 618 fromcount = 0; | |
| 619 } | |
| 620 ptr[cp++] = '>'; | |
| 621 } | |
| 3650 | 622 memcpy (&ptr[cp], fromserver, ret); |
| 623 cp += ret; | |
| 428 | 624 ptr[cp++] = '\n'; |
| 625 } | |
| 626 | |
| 3650 | 627 free (ptr); |
| 628 return (-1); | |
| 428 | 629 } |
| 630 | |
| 631 int | |
| 632 pop_retrieve_first (popserver server, int message, char **response) | |
| 633 { | |
| 634 sprintf (pop_error, "RETR %d", message); | |
| 635 return (pop_multi_first (server, pop_error, response)); | |
| 636 } | |
| 637 | |
| 3650 | 638 /* |
| 639 Returns a negative number on error, 0 to indicate that the data has | |
| 640 all been read (i.e., the server has returned a "." termination | |
| 641 line), or a positive number indicating the number of bytes in the | |
| 642 returned buffer (which is null-terminated and may contain embedded | |
| 643 nulls, but the returned bytecount doesn't include the final null). | |
| 644 */ | |
| 645 | |
| 428 | 646 int |
| 647 pop_retrieve_next (popserver server, char **line) | |
| 648 { | |
| 649 return (pop_multi_next (server, line)); | |
| 650 } | |
| 651 | |
| 652 int | |
| 653 pop_retrieve_flush (popserver server) | |
| 654 { | |
| 655 return (pop_multi_flush (server)); | |
| 656 } | |
| 657 | |
| 658 int | |
| 659 pop_top_first (popserver server, int message, int lines, char **response) | |
| 660 { | |
| 661 sprintf (pop_error, "TOP %d %d", message, lines); | |
| 662 return (pop_multi_first (server, pop_error, response)); | |
| 663 } | |
| 664 | |
| 3650 | 665 /* |
| 666 Returns a negative number on error, 0 to indicate that the data has | |
| 667 all been read (i.e., the server has returned a "." termination | |
| 668 line), or a positive number indicating the number of bytes in the | |
| 669 returned buffer (which is null-terminated and may contain embedded | |
| 670 nulls, but the returned bytecount doesn't include the final null). | |
| 671 */ | |
| 672 | |
| 428 | 673 int |
| 674 pop_top_next (popserver server, char **line) | |
| 675 { | |
| 676 return (pop_multi_next (server, line)); | |
| 677 } | |
| 678 | |
| 679 int | |
| 680 pop_top_flush (popserver server) | |
| 681 { | |
| 682 return (pop_multi_flush (server)); | |
| 683 } | |
| 684 | |
| 685 int | |
| 686 pop_multi_first (popserver server, char *command, char **response) | |
| 687 { | |
| 688 if (server->in_multi) | |
| 689 { | |
| 690 strcpy (pop_error, | |
| 691 "Already in multi-line query in pop_multi_first"); | |
| 692 return (-1); | |
| 693 } | |
| 694 | |
| 3650 | 695 if (sendline (server, command) || (pop_getline (server, response) < 0)) |
| 428 | 696 { |
| 697 return (-1); | |
| 698 } | |
| 699 | |
| 700 if (0 == strncmp (*response, "-ERR", 4)) | |
| 701 { | |
| 702 strncpy (pop_error, *response, ERROR_MAX); | |
| 703 return (-1); | |
| 704 } | |
| 705 else if (0 == strncmp (*response, "+OK", 3)) | |
| 706 { | |
| 707 for (*response += 3; **response == ' '; (*response)++) /* empty */; | |
| 708 server->in_multi = 1; | |
| 709 return (0); | |
| 710 } | |
| 711 else | |
| 712 { | |
| 713 strcpy (pop_error, | |
| 714 "Unexpected response from server in pop_multi_first"); | |
| 715 return (-1); | |
| 716 } | |
| 717 } | |
| 718 | |
| 3650 | 719 /* |
| 720 Read the next line of data from SERVER and place a pointer to it | |
| 721 into LINE. Return -1 on error, 0 if there are no more lines to read | |
| 722 (i.e., the server has returned a line containing only "."), or a | |
| 723 positive number indicating the number of bytes in the LINE buffer | |
| 724 (not including the final null). The data in that buffer may contain | |
| 725 embedded nulls, but does not contain the final CRLF. When returning | |
| 726 0, LINE is set to null. */ | |
| 727 | |
| 428 | 728 int |
| 729 pop_multi_next (popserver server, char **line) | |
| 730 { | |
| 731 char *fromserver; | |
| 3650 | 732 int ret; |
| 428 | 733 |
| 734 if (! server->in_multi) | |
| 735 { | |
| 736 strcpy (pop_error, "Not in multi-line query in pop_multi_next"); | |
| 737 return (-1); | |
| 738 } | |
| 739 | |
| 3650 | 740 if ((ret = pop_getline (server, &fromserver)) < 0) |
| 428 | 741 { |
| 742 return (-1); | |
| 743 } | |
| 744 | |
| 745 if (fromserver[0] == '.') | |
| 746 { | |
| 747 if (! fromserver[1]) | |
| 748 { | |
| 749 *line = 0; | |
| 750 server->in_multi = 0; | |
| 751 return (0); | |
| 752 } | |
| 753 else | |
| 754 { | |
| 755 *line = fromserver + 1; | |
| 3650 | 756 return (ret - 1); |
| 428 | 757 } |
| 758 } | |
| 759 else | |
| 760 { | |
| 761 *line = fromserver; | |
| 3650 | 762 return (ret); |
| 428 | 763 } |
| 764 } | |
| 765 | |
| 766 int | |
| 767 pop_multi_flush (popserver server) | |
| 768 { | |
| 769 char *line; | |
| 3650 | 770 int ret; |
| 428 | 771 |
| 772 if (! server->in_multi) | |
| 773 { | |
| 774 return (0); | |
| 775 } | |
| 776 | |
| 3650 | 777 while ((ret = pop_multi_next (server, &line))) |
| 428 | 778 { |
| 3650 | 779 if (ret < 0) |
| 428 | 780 { |
| 3650 | 781 return (-1); |
| 428 | 782 } |
| 783 } | |
| 784 | |
| 3650 | 785 return (0); |
| 428 | 786 } |
| 787 | |
| 788 /* Function: pop_delete | |
| 789 * | |
| 790 * Purpose: Delete a specified message. | |
| 791 * | |
| 792 * Arguments: | |
| 793 * server Server from which to delete the message. | |
| 794 * message Message to delete. | |
| 795 * | |
| 796 * Return value: 0 on success, non-zero with error in pop_error | |
| 797 * otherwise. | |
| 798 */ | |
| 799 int | |
| 800 pop_delete (popserver server, int message) | |
| 801 { | |
| 802 if (server->in_multi) | |
| 803 { | |
| 804 strcpy (pop_error, "In multi-line query in pop_delete"); | |
| 805 return (-1); | |
| 806 } | |
| 807 | |
| 808 sprintf (pop_error, "DELE %d", message); | |
| 809 | |
| 810 if (sendline (server, pop_error) || getok (server)) | |
| 811 return (-1); | |
| 812 | |
| 813 return (0); | |
| 814 } | |
| 815 | |
| 816 /* | |
| 817 * Function: pop_noop | |
| 818 * | |
| 819 * Purpose: Send a noop command to the server. | |
| 820 * | |
| 821 * Argument: | |
| 822 * server The server to send to. | |
| 823 * | |
| 824 * Return value: 0 on success, non-zero with error in pop_error | |
| 825 * otherwise. | |
| 826 * | |
| 827 * Side effects: Closes connection on error. | |
| 828 */ | |
| 829 int | |
| 830 pop_noop (popserver server) | |
| 831 { | |
| 832 if (server->in_multi) | |
| 833 { | |
| 834 strcpy (pop_error, "In multi-line query in pop_noop"); | |
| 835 return (-1); | |
| 836 } | |
| 837 | |
| 838 if (sendline (server, "NOOP") || getok (server)) | |
| 839 return (-1); | |
| 840 | |
| 841 return (0); | |
| 842 } | |
| 843 | |
| 844 /* | |
| 845 * Function: pop_last | |
| 846 * | |
| 847 * Purpose: Find out the highest seen message from the server. | |
| 848 * | |
| 849 * Arguments: | |
| 850 * server The server. | |
| 851 * | |
| 852 * Return value: If successful, the highest seen message, which is | |
| 853 * greater than or equal to 0. Otherwise, a negative number with | |
| 854 * the error explained in pop_error. | |
| 855 * | |
| 856 * Side effects: Closes the connection on error. | |
| 857 */ | |
| 858 int | |
| 859 pop_last (popserver server) | |
| 860 { | |
| 861 char *fromserver; | |
| 862 | |
| 863 if (server->in_multi) | |
| 864 { | |
| 865 strcpy (pop_error, "In multi-line query in pop_last"); | |
| 866 return (-1); | |
| 867 } | |
| 868 | |
| 869 if (sendline (server, "LAST")) | |
| 870 return (-1); | |
| 871 | |
| 3650 | 872 if (pop_getline (server, &fromserver) < 0) |
| 428 | 873 return (-1); |
| 874 | |
| 875 if (! strncmp (fromserver, "-ERR", 4)) | |
| 876 { | |
| 877 strncpy (pop_error, fromserver, ERROR_MAX); | |
| 878 return (-1); | |
| 879 } | |
| 880 else if (strncmp (fromserver, "+OK ", 4)) | |
| 881 { | |
| 882 strcpy (pop_error, "Unexpected response from server in pop_last"); | |
| 883 pop_trash (server); | |
| 884 return (-1); | |
| 885 } | |
| 886 else | |
| 887 { | |
| 888 return (atoi (&fromserver[4])); | |
| 889 } | |
| 890 } | |
| 891 | |
| 892 /* | |
| 893 * Function: pop_reset | |
| 894 * | |
| 895 * Purpose: Reset the server to its initial connect state | |
| 896 * | |
| 897 * Arguments: | |
| 898 * server The server. | |
| 899 * | |
| 900 * Return value: 0 for success, non-0 with error in pop_error | |
| 901 * otherwise. | |
| 902 * | |
| 903 * Side effects: Closes the connection on error. | |
| 904 */ | |
| 905 int | |
| 906 pop_reset (popserver server) | |
| 907 { | |
| 908 if (pop_retrieve_flush (server)) | |
| 909 { | |
| 910 return (-1); | |
| 911 } | |
| 912 | |
| 913 if (sendline (server, "RSET") || getok (server)) | |
| 914 return (-1); | |
| 915 | |
| 916 return (0); | |
| 917 } | |
| 918 | |
| 919 /* | |
| 920 * Function: pop_quit | |
| 921 * | |
| 922 * Purpose: Quit the connection to the server, | |
| 923 * | |
| 924 * Arguments: | |
| 925 * server The server to quit. | |
| 926 * | |
| 927 * Return value: 0 for success, non-zero otherwise with error in | |
| 928 * pop_error. | |
| 929 * | |
| 930 * Side Effects: The popserver passed in is unusable after this | |
| 931 * function is called, even if an error occurs. | |
| 932 */ | |
| 933 int | |
| 934 pop_quit (popserver server) | |
| 935 { | |
| 936 int ret = 0; | |
| 937 | |
| 938 if (server->file >= 0) | |
| 939 { | |
| 940 if (pop_retrieve_flush (server)) | |
| 941 { | |
| 942 ret = -1; | |
| 943 } | |
| 944 | |
| 945 if (sendline (server, "QUIT") || getok (server)) | |
| 946 { | |
| 947 ret = -1; | |
| 948 } | |
| 949 | |
| 950 CLOSESOCKET (server->file); | |
| 951 } | |
| 952 | |
| 953 if (server->buffer) | |
| 954 free (server->buffer); | |
| 955 free ((char *) server); | |
| 956 | |
| 957 return (ret); | |
| 958 } | |
| 959 | |
| 442 | 960 #ifdef WIN32_NATIVE |
| 428 | 961 static int have_winsock = 0; |
| 962 #endif | |
| 963 | |
| 964 /* | |
| 965 * Function: socket_connection | |
| 966 * | |
| 967 * Purpose: Opens the network connection with the mail host, without | |
| 968 * doing any sort of I/O with it or anything. | |
| 969 * | |
| 970 * Arguments: | |
| 971 * host The host to which to connect. | |
| 972 * flags Option flags. | |
| 973 * | |
| 974 * Return value: A file descriptor indicating the connection, or -1 | |
| 975 * indicating failure, in which case an error has been copied | |
| 976 * into pop_error. | |
| 977 */ | |
| 978 static int | |
| 2286 | 979 socket_connection (char *host, |
| 980 #if defined (KERBEROS) || defined (HESIOD) | |
| 981 int flags | |
| 982 #else | |
| 983 int UNUSED (flags) | |
| 984 #endif | |
| 985 ) | |
| 428 | 986 { |
| 987 struct hostent *hostent; | |
| 988 struct servent *servent; | |
| 989 struct sockaddr_in addr; | |
| 990 char found_port = 0; | |
| 991 char *service; | |
| 992 int sock; | |
| 993 #ifdef KERBEROS | |
| 994 #ifdef KRB5 | |
| 995 krb5_error_code rem; | |
| 3650 | 996 krb5_context kcontext = 0; |
| 997 krb5_auth_context auth_context = 0; | |
| 428 | 998 krb5_ccache ccdef; |
| 999 krb5_principal client, server; | |
| 1000 krb5_error *err_ret; | |
| 1001 register char *cp; | |
| 1002 #else | |
| 1003 KTEXT ticket; | |
| 1004 MSG_DAT msg_data; | |
| 1005 CREDENTIALS cred; | |
| 1006 Key_schedule schedule; | |
| 1007 int rem; | |
| 3650 | 1008 char *realhost; |
| 428 | 1009 #endif /* KRB5 */ |
| 1010 #endif /* KERBEROS */ | |
| 1011 | |
| 1012 int try_count = 0; | |
| 1013 | |
| 442 | 1014 #ifdef WIN32_NATIVE |
| 428 | 1015 { |
| 1016 WSADATA winsockData; | |
| 1017 if (WSAStartup (0x101, &winsockData) == 0) | |
| 1018 have_winsock = 1; | |
| 1019 } | |
| 1020 #endif | |
| 1021 | |
| 1022 memset (&addr, 0, sizeof (addr)); | |
| 1023 addr.sin_family = AF_INET; | |
| 1024 | |
| 1025 #ifdef KERBEROS | |
| 1026 service = (flags & POP_NO_KERBEROS) ? POP_SERVICE : KPOP_SERVICE; | |
| 1027 #else | |
| 1028 service = POP_SERVICE; | |
| 1029 #endif | |
| 1030 | |
| 1031 #ifdef HESIOD | |
| 1032 if (! (flags & POP_NO_HESIOD)) | |
| 1033 { | |
| 1034 servent = hes_getservbyname (service, "tcp"); | |
| 1035 if (servent) | |
| 1036 { | |
| 1037 addr.sin_port = servent->s_port; | |
| 1038 found_port = 1; | |
| 1039 } | |
| 1040 } | |
| 1041 #endif | |
| 1042 if (! found_port) | |
| 1043 { | |
| 1044 servent = getservbyname (service, "tcp"); | |
| 1045 if (servent) | |
| 1046 { | |
| 1047 addr.sin_port = servent->s_port; | |
| 1048 } | |
| 1049 else | |
| 1050 { | |
| 1051 #ifdef KERBEROS | |
| 1052 addr.sin_port = htons ((flags & POP_NO_KERBEROS) ? | |
| 1053 POP_PORT : KPOP_PORT); | |
| 1054 #else | |
| 1055 addr.sin_port = htons (POP_PORT); | |
| 1056 #endif | |
| 1057 } | |
| 1058 } | |
| 1059 | |
| 3650 | 1060 #define POP_SOCKET_ERROR "Could not create socket for POP connection: " |
| 428 | 1061 |
| 1062 sock = socket (PF_INET, SOCK_STREAM, 0); | |
| 1063 if (sock < 0) | |
| 1064 { | |
| 3650 | 1065 strcpy (pop_error, POP_SOCKET_ERROR); |
| 428 | 1066 strncat (pop_error, strerror (errno), |
| 3650 | 1067 ERROR_MAX - sizeof (POP_SOCKET_ERROR)); |
| 428 | 1068 return (-1); |
| 1069 | |
| 1070 } | |
| 1071 | |
| 3650 | 1072 do |
| 1073 { | |
| 1074 hostent = gethostbyname (host); | |
| 1075 try_count++; | |
| 1076 if ((! hostent) && ((h_errno != TRY_AGAIN) || (try_count == 5))) | |
| 1077 { | |
|
5834
7984e732829e
Fix file descriptor leak in pop.c.
Jerry James <james@xemacs.org>
parents:
5402
diff
changeset
|
1078 CLOSESOCKET (sock); |
| 3650 | 1079 strcpy (pop_error, "Could not determine POP server's address"); |
| 1080 return (-1); | |
| 1081 } | |
| 1082 } while (! hostent); | |
| 1083 | |
| 428 | 1084 while (*hostent->h_addr_list) |
| 1085 { | |
| 1086 memcpy (&addr.sin_addr, *hostent->h_addr_list, hostent->h_length); | |
| 1087 if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr))) | |
| 1088 break; | |
| 1089 hostent->h_addr_list++; | |
| 1090 } | |
| 1091 | |
| 1092 #define CONNECT_ERROR "Could not connect to POP server: " | |
| 1093 | |
| 1094 if (! *hostent->h_addr_list) | |
| 1095 { | |
| 1096 CLOSESOCKET (sock); | |
| 1097 strcpy (pop_error, CONNECT_ERROR); | |
| 1098 strncat (pop_error, strerror (errno), | |
| 1099 ERROR_MAX - sizeof (CONNECT_ERROR)); | |
| 1100 return (-1); | |
| 1101 | |
| 1102 } | |
| 1103 | |
| 1104 #ifdef KERBEROS | |
| 1105 #define KRB_ERROR "Kerberos error connecting to POP server: " | |
| 1106 if (! (flags & POP_NO_KERBEROS)) | |
| 1107 { | |
| 1108 #ifdef KRB5 | |
| 3650 | 1109 if ((rem = krb5_init_context (&kcontext))) |
| 428 | 1110 { |
| 1111 krb5error: | |
| 3650 | 1112 if (auth_context) |
| 1113 krb5_auth_con_free (kcontext, auth_context); | |
| 1114 if (kcontext) | |
| 1115 krb5_free_context (kcontext); | |
| 428 | 1116 strcpy (pop_error, KRB_ERROR); |
| 1117 strncat (pop_error, error_message (rem), | |
| 1118 ERROR_MAX - sizeof(KRB_ERROR)); | |
| 1119 CLOSESOCKET (sock); | |
| 1120 return (-1); | |
| 1121 } | |
| 1122 | |
| 3650 | 1123 if ((rem = krb5_auth_con_init (kcontext, &auth_context))) |
| 1124 goto krb5error; | |
| 1125 | |
| 1126 if (rem = krb5_cc_default (kcontext, &ccdef)) | |
| 1127 goto krb5error; | |
| 1128 | |
| 1129 if (rem = krb5_cc_get_principal (kcontext, ccdef, &client)) | |
| 1130 goto krb5error; | |
| 428 | 1131 |
| 1132 for (cp = hostent->h_name; *cp; cp++) | |
| 1133 { | |
| 1134 if (isupper (*cp)) | |
| 1135 { | |
| 1136 *cp = tolower (*cp); | |
| 1137 } | |
| 1138 } | |
| 1139 | |
| 3650 | 1140 if (rem = krb5_sname_to_principal (kcontext, hostent->h_name, |
| 1141 POP_SERVICE, FALSE, &server)) | |
| 1142 goto krb5error; | |
| 428 | 1143 |
| 3650 | 1144 rem = krb5_sendauth (kcontext, &auth_context, |
| 1145 (krb5_pointer) &sock, "KPOPV1.0", client, server, | |
| 428 | 1146 AP_OPTS_MUTUAL_REQUIRED, |
| 1147 0, /* no checksum */ | |
| 1148 0, /* no creds, use ccache instead */ | |
| 1149 ccdef, | |
| 3650 | 1150 &err_ret, |
| 428 | 1151 0, /* don't need subsession key */ |
| 1152 0); /* don't need reply */ | |
| 3650 | 1153 krb5_free_principal (kcontext, server); |
| 428 | 1154 if (rem) |
| 1155 { | |
| 1156 if (err_ret && err_ret->text.length) | |
| 1157 { | |
| 1158 strcpy (pop_error, KRB_ERROR); | |
| 1159 strncat (pop_error, error_message (rem), | |
| 1160 ERROR_MAX - sizeof (KRB_ERROR)); | |
| 1161 strncat (pop_error, " [server says '", | |
| 1162 ERROR_MAX - strlen (pop_error) - 1); | |
| 1163 strncat (pop_error, err_ret->text.data, | |
| 1164 min (ERROR_MAX - strlen (pop_error) - 1, | |
| 1165 err_ret->text.length)); | |
| 1166 strncat (pop_error, "']", | |
| 1167 ERROR_MAX - strlen (pop_error) - 1); | |
| 1168 } | |
| 1169 else | |
| 1170 { | |
| 1171 strcpy (pop_error, KRB_ERROR); | |
| 1172 strncat (pop_error, error_message (rem), | |
| 1173 ERROR_MAX - sizeof (KRB_ERROR)); | |
| 1174 } | |
| 1175 if (err_ret) | |
| 3650 | 1176 krb5_free_error (kcontext, err_ret); |
| 1177 krb5_auth_con_free (kcontext, auth_context); | |
| 1178 krb5_free_context (kcontext); | |
| 428 | 1179 |
| 1180 CLOSESOCKET (sock); | |
| 1181 return (-1); | |
| 1182 } | |
| 1183 #else /* ! KRB5 */ | |
| 1184 ticket = (KTEXT) malloc (sizeof (KTEXT_ST)); | |
| 3650 | 1185 rem = krb_sendauth (0L, sock, ticket, "pop", realhost, |
| 1186 (char *) krb_realmofhost (realhost), | |
| 428 | 1187 (unsigned long) 0, &msg_data, &cred, schedule, |
| 1188 (struct sockaddr_in *) 0, | |
| 1189 (struct sockaddr_in *) 0, | |
| 1190 "KPOPV0.1"); | |
| 1191 free ((char *) ticket); | |
| 3650 | 1192 free (realhost); |
| 428 | 1193 if (rem != KSUCCESS) |
| 1194 { | |
| 1195 strcpy (pop_error, KRB_ERROR); | |
| 1196 strncat (pop_error, krb_err_txt[rem], | |
| 1197 ERROR_MAX - sizeof (KRB_ERROR)); | |
| 1198 CLOSESOCKET (sock); | |
| 1199 return (-1); | |
| 1200 } | |
| 1201 #endif /* KRB5 */ | |
| 1202 } | |
| 1203 #endif /* KERBEROS */ | |
| 1204 | |
| 1205 return (sock); | |
| 1206 } /* socket_connection */ | |
| 1207 | |
| 1208 /* | |
| 1209 * Function: pop_getline | |
| 1210 * | |
| 1211 * Purpose: Get a line of text from the connection and return a | |
| 1212 * pointer to it. The carriage return and linefeed at the end of | |
| 1213 * the line are stripped, but periods at the beginnings of lines | |
| 1214 * are NOT dealt with in any special way. | |
| 1215 * | |
| 1216 * Arguments: | |
| 1217 * server The server from which to get the line of text. | |
| 1218 * | |
| 3650 | 1219 * Returns: The number of characters in the line, which is returned in |
| 1220 * LINE, not including the final null. A return value of 0 | |
| 1221 * indicates a blank line. A negative return value indicates an | |
| 1222 * error (in which case the contents of LINE are undefined. In | |
| 1223 * case of error, an error message is copied into pop_error. | |
| 428 | 1224 * |
| 1225 * Notes: The line returned is overwritten with each call to pop_getline. | |
| 1226 * | |
| 1227 * Side effects: Closes the connection on error. | |
| 3650 | 1228 * |
| 1229 * THE RETURNED LINE MAY CONTAIN EMBEDDED NULLS! | |
| 428 | 1230 */ |
| 3650 | 1231 static int |
| 1232 pop_getline (popserver server, char **line) | |
| 428 | 1233 { |
| 1234 #define GETLINE_ERROR "Error reading from server: " | |
| 1235 | |
| 1236 int ret; | |
| 1237 int search_offset = 0; | |
| 1238 | |
| 1239 if (server->data) | |
| 1240 { | |
| 3650 | 1241 char *cp = find_crlf (server->buffer + server->buffer_index, |
| 1242 server->data); | |
| 428 | 1243 if (cp) |
| 1244 { | |
| 1245 int found; | |
| 1246 int data_used; | |
| 1247 | |
| 1248 found = server->buffer_index; | |
| 1249 data_used = (cp + 2) - server->buffer - found; | |
| 1250 | |
| 1251 *cp = '\0'; /* terminate the string to be returned */ | |
| 1252 server->data -= data_used; | |
| 1253 server->buffer_index += data_used; | |
| 1254 | |
| 1255 if (pop_debug) | |
| 3650 | 1256 /* Embedded nulls will truncate this output prematurely, |
| 1257 but that's OK because it's just for debugging anyway. */ | |
| 428 | 1258 fprintf (stderr, "<<< %s\n", server->buffer + found); |
| 3650 | 1259 *line = server->buffer + found; |
| 1260 return (data_used - 2); | |
| 428 | 1261 } |
| 1262 else | |
| 1263 { | |
| 1264 memcpy (server->buffer, | |
| 1265 server->buffer + server->buffer_index, | |
| 1266 server->data); | |
| 1267 /* Record the fact that we've searched the data already in | |
| 1268 the buffer for a CRLF, so that when we search below, we | |
| 1269 don't have to search the same data twice. There's a "- | |
| 1270 1" here to account for the fact that the last character | |
| 1271 of the data we have may be the CR of a CRLF pair, of | |
| 1272 which we haven't read the second half yet, so we may have | |
| 1273 to search it again when we read more data. */ | |
| 1274 search_offset = server->data - 1; | |
| 1275 server->buffer_index = 0; | |
| 1276 } | |
| 1277 } | |
| 1278 else | |
| 1279 { | |
| 1280 server->buffer_index = 0; | |
| 1281 } | |
| 1282 | |
| 1283 while (1) | |
| 1284 { | |
| 1285 /* There's a "- 1" here to leave room for the null that we put | |
| 1286 at the end of the read data below. We put the null there so | |
| 1287 that find_crlf knows where to stop when we call it. */ | |
| 1288 if (server->data == server->buffer_size - 1) | |
| 1289 { | |
| 1290 server->buffer_size += GETLINE_INCR; | |
| 1291 server->buffer = (char *)realloc (server->buffer, server->buffer_size); | |
| 1292 if (! server->buffer) | |
| 1293 { | |
| 1294 strcpy (pop_error, "Out of memory in pop_getline"); | |
| 1295 pop_trash (server); | |
| 3650 | 1296 return (-1); |
| 428 | 1297 } |
| 1298 } | |
| 1299 ret = RECV (server->file, server->buffer + server->data, | |
| 1300 server->buffer_size - server->data - 1, 0); | |
| 1301 if (ret < 0) | |
| 1302 { | |
| 1303 strcpy (pop_error, GETLINE_ERROR); | |
| 1304 strncat (pop_error, strerror (errno), | |
| 1305 ERROR_MAX - sizeof (GETLINE_ERROR)); | |
| 1306 pop_trash (server); | |
| 3650 | 1307 return (-1); |
| 428 | 1308 } |
| 1309 else if (ret == 0) | |
| 1310 { | |
| 1311 strcpy (pop_error, "Unexpected EOF from server in pop_getline"); | |
| 1312 pop_trash (server); | |
| 3650 | 1313 return (-1); |
| 428 | 1314 } |
| 1315 else | |
| 1316 { | |
| 1317 char *cp; | |
| 1318 server->data += ret; | |
| 1319 server->buffer[server->data] = '\0'; | |
| 1320 | |
| 3650 | 1321 cp = find_crlf (server->buffer + search_offset, |
| 1322 server->data - search_offset); | |
| 428 | 1323 if (cp) |
| 1324 { | |
| 1325 int data_used = (cp + 2) - server->buffer; | |
| 1326 *cp = '\0'; | |
| 1327 server->data -= data_used; | |
| 1328 server->buffer_index = data_used; | |
| 1329 | |
| 1330 if (pop_debug) | |
| 1331 fprintf (stderr, "<<< %s\n", server->buffer); | |
| 3650 | 1332 *line = server->buffer; |
| 1333 return (data_used - 2); | |
| 428 | 1334 } |
| 3650 | 1335 /* As above, the "- 1" here is to account for the fact that |
| 1336 we may have read a CR without its accompanying LF. */ | |
| 1337 search_offset += ret - 1; | |
| 428 | 1338 } |
| 1339 } | |
| 1340 | |
| 1341 /* NOTREACHED */ | |
| 1342 } | |
| 1343 | |
| 1344 /* | |
| 1345 * Function: sendline | |
| 1346 * | |
| 1347 * Purpose: Sends a line of text to the POP server. The line of text | |
| 1348 * passed into this function should NOT have the carriage return | |
| 1349 * and linefeed on the end of it. Periods at beginnings of lines | |
| 1350 * will NOT be treated specially by this function. | |
| 1351 * | |
| 1352 * Arguments: | |
| 1353 * server The server to which to send the text. | |
| 1354 * line The line of text to send. | |
| 1355 * | |
| 1356 * Return value: Upon successful completion, a value of 0 will be | |
| 1357 * returned. Otherwise, a non-zero value will be returned, and | |
| 1358 * an error will be copied into pop_error. | |
| 1359 * | |
| 1360 * Side effects: Closes the connection on error. | |
| 1361 */ | |
| 1362 static int | |
| 1363 sendline (popserver server, char *line) | |
| 1364 { | |
| 1365 #define SENDLINE_ERROR "Error writing to POP server: " | |
| 1366 int ret; | |
| 3650 | 1367 char *buf; |
| 428 | 1368 |
| 3650 | 1369 /* Combine the string and the CR-LF into one buffer. Otherwise, two |
| 1370 reasonable network stack optimizations, Nagle's algorithm and | |
| 1371 delayed acks, combine to delay us a fraction of a second on every | |
| 1372 message we send. (Movemail writes line without \r\n, client | |
| 1373 kernel sends packet, server kernel delays the ack to see if it | |
| 1374 can combine it with data, movemail writes \r\n, client kernel | |
| 1375 waits because it has unacked data already in its outgoing queue, | |
| 1376 client kernel eventually times out and sends.) | |
| 1377 | |
| 1378 This can be something like 0.2s per command, which can add up | |
| 1379 over a few dozen messages, and is a big chunk of the time we | |
| 1380 spend fetching mail from a server close by. */ | |
| 1381 buf = alloca (strlen (line) + 3); | |
| 1382 strcpy (buf, line); | |
| 1383 strcat (buf, "\r\n"); | |
| 428 | 1384 ret = fullwrite (server->file, line, strlen (line)); |
| 1385 | |
| 1386 if (ret < 0) | |
| 1387 { | |
| 1388 pop_trash (server); | |
| 1389 strcpy (pop_error, SENDLINE_ERROR); | |
| 1390 strncat (pop_error, strerror (errno), | |
| 1391 ERROR_MAX - sizeof (SENDLINE_ERROR)); | |
| 1392 return (ret); | |
| 1393 } | |
| 1394 | |
| 1395 if (pop_debug) | |
| 1396 fprintf (stderr, ">>> %s\n", line); | |
| 1397 | |
| 1398 return (0); | |
| 1399 } | |
| 1400 | |
| 1401 /* | |
| 1402 * Procedure: fullwrite | |
| 1403 * | |
| 1404 * Purpose: Just like write, but keeps trying until the entire string | |
| 1405 * has been written. | |
| 1406 * | |
| 1407 * Return value: Same as write. Pop_error is not set. | |
| 1408 */ | |
| 1409 static int | |
| 1410 fullwrite (int fd, char *buf, int nbytes) | |
| 1411 { | |
| 1412 char *cp; | |
| 3650 | 1413 int ret = 0; |
| 428 | 1414 |
| 1415 cp = buf; | |
| 3650 | 1416 while (nbytes && ((ret = SEND (fd, cp, nbytes, 0)) > 0)) |
| 428 | 1417 { |
| 1418 cp += ret; | |
| 1419 nbytes -= ret; | |
| 1420 } | |
| 1421 | |
| 1422 return (ret); | |
| 1423 } | |
| 1424 | |
| 1425 /* | |
| 1426 * Procedure getok | |
| 1427 * | |
| 1428 * Purpose: Reads a line from the server. If the return indicator is | |
| 1429 * positive, return with a zero exit status. If not, return with | |
| 1430 * a negative exit status. | |
| 1431 * | |
| 1432 * Arguments: | |
| 1433 * server The server to read from. | |
| 1434 * | |
| 1435 * Returns: 0 for success, else for failure and puts error in pop_error. | |
| 1436 * | |
| 1437 * Side effects: On failure, may make the connection unusable. | |
| 1438 */ | |
| 1439 static int | |
| 1440 getok (popserver server) | |
| 1441 { | |
| 1442 char *fromline; | |
| 1443 | |
| 3650 | 1444 if (pop_getline (server, &fromline) < 0) |
| 428 | 1445 { |
| 1446 return (-1); | |
| 1447 } | |
| 1448 | |
| 1449 if (! strncmp (fromline, "+OK", 3)) | |
| 1450 return (0); | |
| 1451 else if (! strncmp (fromline, "-ERR", 4)) | |
| 1452 { | |
| 1453 strncpy (pop_error, fromline, ERROR_MAX); | |
| 1454 pop_error[ERROR_MAX-1] = '\0'; | |
| 1455 return (-1); | |
| 1456 } | |
| 1457 else | |
| 1458 { | |
| 1459 strcpy (pop_error, | |
| 1460 "Unexpected response from server; expecting +OK or -ERR"); | |
| 1461 pop_trash (server); | |
| 1462 return (-1); | |
| 1463 } | |
| 1464 } | |
| 1465 | |
| 1466 #if 0 | |
| 1467 /* | |
| 1468 * Function: gettermination | |
| 1469 * | |
| 1470 * Purpose: Gets the next line and verifies that it is a termination | |
| 1471 * line (nothing but a dot). | |
| 1472 * | |
| 1473 * Return value: 0 on success, non-zero with pop_error set on error. | |
| 1474 * | |
| 1475 * Side effects: Closes the connection on error. | |
| 1476 */ | |
| 1477 static int | |
| 1478 gettermination (popserver server) | |
| 1479 { | |
| 1480 char *fromserver; | |
| 1481 | |
| 3650 | 1482 if (pop_getline (server, &fromserver) < 0) |
| 428 | 1483 return (-1); |
| 1484 | |
| 1485 if (strcmp (fromserver, ".")) | |
| 1486 { | |
| 1487 strcpy (pop_error, | |
| 1488 "Unexpected response from server in gettermination"); | |
| 1489 pop_trash (server); | |
| 1490 return (-1); | |
| 1491 } | |
| 1492 | |
| 1493 return (0); | |
| 1494 } | |
| 1495 #endif | |
| 1496 | |
| 1497 /* | |
| 1498 * Function pop_close | |
| 1499 * | |
| 1500 * Purpose: Close a pop connection, sending a "RSET" command to try to | |
| 1501 * preserve any changes that were made and a "QUIT" command to | |
| 1502 * try to get the server to quit, but ignoring any responses that | |
| 1503 * are received. | |
| 1504 * | |
| 1505 * Side effects: The server is unusable after this function returns. | |
| 1506 * Changes made to the maildrop since the session was started (or | |
| 1507 * since the last pop_reset) may be lost. | |
| 1508 */ | |
| 1509 void | |
| 1510 pop_close (popserver server) | |
| 1511 { | |
| 1512 pop_trash (server); | |
| 1513 free ((char *) server); | |
| 1514 | |
| 1515 return; | |
| 1516 } | |
| 1517 | |
| 1518 /* | |
| 1519 * Function: pop_trash | |
| 1520 * | |
| 1521 * Purpose: Like pop_close or pop_quit, but doesn't deallocate the | |
| 1522 * memory associated with the server. It is legal to call | |
| 1523 * pop_close or pop_quit after this function has been called. | |
| 1524 */ | |
| 1525 static void | |
| 1526 pop_trash (popserver server) | |
| 1527 { | |
| 1528 if (server->file >= 0) | |
| 1529 { | |
| 1530 /* avoid recursion; sendline can call pop_trash */ | |
| 1531 if (server->trash_started) | |
| 1532 return; | |
| 1533 server->trash_started = 1; | |
| 1534 | |
| 1535 sendline (server, "RSET"); | |
| 1536 sendline (server, "QUIT"); | |
| 1537 | |
| 1538 CLOSESOCKET (server->file); | |
| 1539 server->file = -1; | |
| 1540 if (server->buffer) | |
| 1541 { | |
| 1542 free (server->buffer); | |
| 1543 server->buffer = 0; | |
| 1544 } | |
| 1545 } | |
| 1546 | |
| 442 | 1547 #ifdef WIN32_NATIVE |
| 428 | 1548 if (have_winsock) |
| 1549 WSACleanup (); | |
| 1550 #endif | |
| 1551 } | |
| 1552 | |
| 3650 | 1553 /* Return a pointer to the first CRLF in IN_STRING, which can contain |
| 1554 embedded nulls and has LEN characters in it not including the final | |
| 1555 null, or 0 if it does not contain one. */ | |
| 428 | 1556 |
| 1557 static char * | |
| 3650 | 1558 find_crlf (char *in_string, int len) |
| 428 | 1559 { |
| 3650 | 1560 while (len--) |
| 428 | 1561 { |
| 3650 | 1562 if (*in_string == '\r') |
| 428 | 1563 { |
| 1564 if (*++in_string == '\n') | |
| 1565 return (in_string - 1); | |
| 1566 } | |
| 1567 else | |
| 1568 in_string++; | |
| 1569 } | |
| 3650 | 1570 return (0); |
| 428 | 1571 } |
| 1572 | |
| 1573 #endif /* MAIL_USE_POP */ |