Pileus Git - ~andy/fetchmail/blob - rcfile_y.y

   1 %{
   2 /*
   3  * rcfile_y.y -- Run control file parser for fetchmail
   4  *
   5  * For license terms, see the file COPYING in this directory.
   6  */
   7
   8 #include "config.h"
   9 #include <stdio.h>
  10 #include <sys/types.h>
  11 #include <sys/file.h>
  12 #if defined(HAVE_SYS_WAIT_H)
  13 #include <sys/wait.h>
  14 #endif
  15 #include <sys/stat.h>
  16 #include <errno.h>
  17 #if defined(STDC_HEADERS)
  18 #include <stdlib.h>
  19 #endif
  20 #if defined(HAVE_UNISTD_H)
  21 #include <unistd.h>
  22 #endif
  23 #include <string.h>
  24
  25 #if NET_SECURITY
  26 #include <net/security.h>
  27 #endif /* NET_SECURITY */
  28
  29 #include "fetchmail.h"
  30 #include "i18n.h"
  31
  32 /* parser reads these */
  33 char *rcfile;                   /* path name of rc file */
  34 struct query cmd_opts;          /* where to put command-line info */
  35
  36 /* parser sets these */
  37 struct query *querylist;        /* head of server list (globally visible) */
  38
  39 int yydebug;                    /* in case we didn't generate with -- debug */
  40
  41 static struct query current;    /* current server record */
  42 static int prc_errflag;
  43 static struct hostdata *leadentry;
  44 static flag trailer;
  45
  46 static void record_current(void);
  47 static void user_reset(void);
  48 static void reset_server(const char *name, int skip);
  49
  50 /* using Bison, this arranges that yydebug messages will show actual tokens */
  51 extern char * yytext;
  52 #define YYPRINT(fp, type, val)  fprintf(fp, " = \"%s\"", yytext)
  53 %}
  54
  55 %union {
  56   int proto;
  57   int number;
  58   char *sval;
  59 }
  60
  61 %token DEFAULTS POLL SKIP VIA AKA LOCALDOMAINS PROTOCOL
  62 %token AUTHENTICATE TIMEOUT KPOP SDPS
  63 %token ENVELOPE QVIRTUAL USERNAME PASSWORD FOLDER SMTPHOST MDA BSMTP LMTP
  64 %token SMTPADDRESS SMTPNAME SPAMRESPONSE PRECONNECT POSTCONNECT LIMIT WARNINGS
  65 %token NETSEC INTERFACE MONITOR PLUGIN PLUGOUT
  66 %token IS HERE THERE TO MAP WILDCARD
  67 %token BATCHLIMIT FETCHLIMIT EXPUNGE PROPERTIES
  68 %token SET LOGFILE DAEMON SYSLOG IDFILE INVISIBLE POSTMASTER BOUNCEMAIL
  69 %token SPAMBOUNCE SHOWDOTS
  70 %token <proto> PROTO AUTHTYPE
  71 %token <sval>  STRING
  72 %token <number> NUMBER
  73 %token NO KEEP FLUSH FETCHALL REWRITE FORCECR STRIPCR PASS8BITS
  74 %token DROPSTATUS DROPDELIVERED
  75 %token DNS SERVICE PORT UIDL INTERVAL MIMEDECODE IDLE CHECKALIAS
  76 %token SSL SSLKEY SSLCERT
  77 %token PRINCIPAL
  78
  79 %%
  80
  81 rcfile          : /* empty */
  82                 | statement_list
  83                 ;
  84
  85 statement_list  : statement
  86                 | statement_list statement
  87                 ;
  88
  89 optmap          : MAP | /* EMPTY */;
  90
  91 /* future global options should also have the form SET <name> optmap <value> */
  92 statement       : SET LOGFILE optmap STRING     {run.logfile = xstrdup($4);}
  93                 | SET IDFILE optmap STRING      {run.idfile = xstrdup($4);}
  94                 | SET DAEMON optmap NUMBER      {run.poll_interval = $4;}
  95                 | SET POSTMASTER optmap STRING  {run.postmaster = xstrdup($4);}
  96                 | SET BOUNCEMAIL                {run.bouncemail = TRUE;}
  97                 | SET NO BOUNCEMAIL             {run.bouncemail = FALSE;}
  98                 | SET SPAMBOUNCE                {run.spambounce = TRUE;}
  99                 | SET NO SPAMBOUNCE             {run.spambounce = FALSE;}
 100                 | SET PROPERTIES optmap STRING  {run.properties =xstrdup($4);}
 101                 | SET SYSLOG                    {run.use_syslog = TRUE;}
 102                 | SET INVISIBLE                 {run.invisible = TRUE;}
 103                 | SET SHOWDOTS                  {run.showdots = TRUE;}
 104
 105 /*
 106  * The way the next two productions are written depends on the fact that
 107  * userspecs cannot be empty.  It's a kluge to deal with files that set
 108  * up a load of defaults and then have poll statements following with no
 109  * user options at all.
 110  */
 111                 | define_server serverspecs             {record_current();}
 112                 | define_server serverspecs userspecs
 113
 114 /* detect and complain about the most common user error */
 115                 | define_server serverspecs userspecs serv_option
 116                         {yyerror(_("server option after user options"));}
 117                 ;
 118
 119 define_server   : POLL STRING           {reset_server($2, FALSE);}
 120                 | SKIP STRING           {reset_server($2, TRUE);}
 121                 | DEFAULTS              {reset_server("defaults", FALSE);}
 122                 ;
 123
 124 serverspecs     : /* EMPTY */
 125                 | serverspecs serv_option
 126                 ;
 127
 128 alias_list      : STRING                {save_str(&current.server.akalist,$1,0);}
 129                 | alias_list STRING     {save_str(&current.server.akalist,$2,0);}
 130                 ;
 131
 132 domain_list     : STRING                {save_str(&current.server.localdomains,$1,0);}
 133                 | domain_list STRING    {save_str(&current.server.localdomains,$2,0);}
 134                 ;
 135
 136 serv_option     : AKA alias_list
 137                 | VIA STRING            {current.server.via = xstrdup($2);}
 138                 | LOCALDOMAINS domain_list
 139                 | PROTOCOL PROTO        {current.server.protocol = $2;}
 140                 | PROTOCOL KPOP         {
 141                                             current.server.protocol = P_POP3;
 142
 143                                             if (current.server.authenticate == A_PASSWORD)
 144 #ifdef KERBEROS_V5
 145                                                 current.server.authenticate = A_KERBEROS_V5;
 146 #else
 147                                                 current.server.authenticate = A_KERBEROS_V4;
 148 #endif /* KERBEROS_V5 */
 149 #if INET6_ENABLE
 150                                             current.server.service = KPOP_PORT;
 151 #else /* INET6_ENABLE */
 152                                             current.server.port = KPOP_PORT;
 153 #endif /* INET6_ENABLE */
 154                                         }
 155                 | PRINCIPAL STRING      {current.server.principal = xstrdup($2);}
 156                 | PROTOCOL SDPS         {
 157 #ifdef SDPS_ENABLE
 158                                             current.server.protocol = P_POP3;
 159                                             current.server.sdps = TRUE;
 160 #else
 161                                             yyerror(_("SDPS not enabled."));
 162 #endif /* SDPS_ENABLE */
 163                                         }
 164                 | UIDL                  {current.server.uidl = FLAG_TRUE;}
 165                 | NO UIDL               {current.server.uidl  = FLAG_FALSE;}
 166                 | CHECKALIAS            {current.server.checkalias = FLAG_TRUE;}
 167                 | NO CHECKALIAS         {current.server.checkalias  = FLAG_FALSE;}
 168                 | SERVICE STRING        {
 169 #if INET6_ENABLE
 170                                         current.server.service = $2;
 171 #endif /* INET6_ENABLE */
 172                                         }
 173                 | PORT NUMBER           {
 174 #if INET6_ENABLE
 175                                         int port = $2;
 176                                         char buf[10];
 177                                         sprintf(buf, "%d", port);
 178                                         current.server.service = xstrdup(buf);
 179 #else
 180                                         current.server.port = $2;
 181 #endif /* INET6_ENABLE */
 182                 }
 183                 | INTERVAL NUMBER
 184                         {current.server.interval = $2;}
 185                 | AUTHENTICATE AUTHTYPE
 186                         {current.server.authenticate = $2;}
 187                 | TIMEOUT NUMBER
 188                         {current.server.timeout = $2;}
 189                 | ENVELOPE NUMBER STRING
 190                                         {
 191                                             current.server.envelope =
 192                                                 xstrdup($3);
 193                                             current.server.envskip = $2;
 194                                         }
 195                 | ENVELOPE STRING
 196                                         {
 197                                             current.server.envelope =
 198                                                 xstrdup($2);
 199                                             current.server.envskip = 0;
 200                                         }
 201
 202                 | QVIRTUAL STRING       {current.server.qvirtual=xstrdup($2);}
 203                 | NETSEC STRING         {
 204 #ifdef NET_SECURITY
 205                                             void *request;
 206                                             int requestlen;
 207
 208                                             if (net_security_strtorequest($2, &request, &requestlen))
 209                                                 yyerror(_("invalid security request"));
 210                                             else {
 211                                                 current.server.netsec = xstrdup($2);
 212                                                 free(request);
 213                                             }
 214 #else
 215                                             yyerror(_("network-security support disabled"));
 216 #endif /* NET_SECURITY */
 217                                         }
 218                 | INTERFACE STRING      {
 219 #if (defined(linux) && !defined(INET6_ENABLE)) || defined(__FreeBSD__)
 220                                         interface_parse($2, &current.server);
 221 #else /* (defined(linux) && !defined(INET6_ENABLE)) || defined(__FreeBSD__) */
 222                                         fprintf(stderr, _("fetchmail: interface option is only supported under Linux and FreeBSD\n"));
 223 #endif /* (defined(linux) && !defined(INET6_ENABLE)) || defined(__FreeBSD__) */
 224                                         }
 225                 | MONITOR STRING        {
 226 #if (defined(linux) && !defined(INET6_ENABLE)) || defined(__FreeBSD__)
 227                                         current.server.monitor = xstrdup($2);
 228 #else /* (defined(linux) && !defined(INET6_ENABLE)) || defined(__FreeBSD__) */
 229                                         fprintf(stderr, _("fetchmail: monitor option is only supported under Linux\n"));
 230 #endif /* (defined(linux) && !defined(INET6_ENABLE) || defined(__FreeBSD__)) */
 231                                         }
 232                 | PLUGIN STRING         { current.server.plugin = xstrdup($2); }
 233                 | PLUGOUT STRING        { current.server.plugout = xstrdup($2); }
 234                 | DNS                   {current.server.dns = FLAG_TRUE;}
 235                 | NO DNS                {current.server.dns = FLAG_FALSE;}
 236                 | NO ENVELOPE           {current.server.envelope = STRING_DISABLED;}
 237                 ;
 238
 239 userspecs       : user1opts             {record_current(); user_reset();}
 240                 | explicits
 241                 ;
 242
 243 explicits       : explicitdef           {record_current(); user_reset();}
 244                 | explicits explicitdef {record_current(); user_reset();}
 245                 ;
 246
 247 explicitdef     : userdef user0opts
 248                 ;
 249
 250 userdef         : USERNAME STRING       {current.remotename = xstrdup($2);}
 251                 | USERNAME mapping_list HERE
 252                 | USERNAME STRING THERE {current.remotename = xstrdup($2);}
 253                 ;
 254
 255 user0opts       : /* EMPTY */
 256                 | user0opts user_option
 257                 ;
 258
 259 user1opts       : user_option
 260                 | user1opts user_option
 261                 ;
 262
 263 localnames      : WILDCARD              {current.wildcard =  TRUE;}
 264                 | mapping_list          {current.wildcard =  FALSE;}
 265                 | mapping_list WILDCARD {current.wildcard =  TRUE;}
 266                 ;
 267
 268 mapping_list    : mapping
 269                 | mapping_list mapping
 270                 ;
 271
 272 mapping         : STRING
 273                                 {save_str_pair(&current.localnames, $1, NULL);}
 274                 | STRING MAP STRING
 275                                 {save_str_pair(&current.localnames, $1, $3);}
 276                 ;
 277
 278 folder_list     : STRING                {save_str(&current.mailboxes,$1,0);}
 279                 | folder_list STRING    {save_str(&current.mailboxes,$2,0);}
 280                 ;
 281
 282 smtp_list       : STRING                {save_str(&current.smtphunt, $1,TRUE);}
 283                 | smtp_list STRING      {save_str(&current.smtphunt, $2,TRUE);}
 284                 ;
 285
 286 num_list        : NUMBER
 287                         {
 288                             struct idlist *id;
 289                             id=save_str(&current.antispam,STRING_DUMMY,0);
 290                             id->val.status.num = $1;
 291                         }
 292                 | num_list NUMBER
 293                         {
 294                             struct idlist *id;
 295                             id=save_str(&current.antispam,STRING_DUMMY,0);
 296                             id->val.status.num = $2;
 297                         }
 298                 ;
 299
 300 user_option     : TO localnames HERE
 301                 | TO localnames
 302                 | IS localnames HERE
 303                 | IS localnames
 304
 305                 | IS STRING THERE       {current.remotename  = xstrdup($2);}
 306                 | PASSWORD STRING       {current.password    = xstrdup($2);}
 307                 | FOLDER folder_list
 308                 | SMTPHOST smtp_list
 309                 | SMTPADDRESS STRING    {current.smtpaddress = xstrdup($2);}
 310                 | SMTPNAME STRING       {current.smtpname = xstrdup($2);}
 311                 | SPAMRESPONSE num_list
 312                 | MDA STRING            {current.mda         = xstrdup($2);}
 313                 | BSMTP STRING          {current.bsmtp       = xstrdup($2);}
 314                 | LMTP                  {current.listener    = LMTP_MODE;}
 315                 | PRECONNECT STRING     {current.preconnect  = xstrdup($2);}
 316                 | POSTCONNECT STRING    {current.postconnect = xstrdup($2);}
 317
 318                 | KEEP                  {current.keep        = FLAG_TRUE;}
 319                 | FLUSH                 {current.flush       = FLAG_TRUE;}
 320                 | FETCHALL              {current.fetchall    = FLAG_TRUE;}
 321                 | REWRITE               {current.rewrite     = FLAG_TRUE;}
 322                 | FORCECR               {current.forcecr     = FLAG_TRUE;}
 323                 | STRIPCR               {current.stripcr     = FLAG_TRUE;}
 324                 | PASS8BITS             {current.pass8bits   = FLAG_TRUE;}
 325                 | DROPSTATUS            {current.dropstatus  = FLAG_TRUE;}
 326                 | DROPDELIVERED         {current.dropdelivered = FLAG_TRUE;}
 327                 | MIMEDECODE            {current.mimedecode  = FLAG_TRUE;}
 328                 | IDLE                  {current.idle        = FLAG_TRUE;}
 329
 330                 | SSL                   {current.use_ssl = FLAG_TRUE;}
 331                 | SSLKEY STRING         {current.sslkey = xstrdup($2);}
 332                 | SSLCERT STRING        {current.sslcert = xstrdup($2);}
 333
 334                 | NO KEEP               {current.keep        = FLAG_FALSE;}
 335                 | NO FLUSH              {current.flush       = FLAG_FALSE;}
 336                 | NO FETCHALL           {current.fetchall    = FLAG_FALSE;}
 337                 | NO REWRITE            {current.rewrite     = FLAG_FALSE;}
 338                 | NO FORCECR            {current.forcecr     = FLAG_FALSE;}
 339                 | NO STRIPCR            {current.stripcr     = FLAG_FALSE;}
 340                 | NO PASS8BITS          {current.pass8bits   = FLAG_FALSE;}
 341                 | NO DROPSTATUS         {current.dropstatus  = FLAG_FALSE;}
 342                 | NO DROPDELIVERED      {current.dropdelivered = FLAG_FALSE;}
 343                 | NO MIMEDECODE         {current.mimedecode  = FLAG_FALSE;}
 344                 | NO IDLE               {current.idle        = FLAG_FALSE;}
 345
 346                 | NO SSL                {current.use_ssl = FLAG_FALSE;}
 347
 348                 | LIMIT NUMBER          {current.limit       = NUM_VALUE_IN($2);}
 349                 | WARNINGS NUMBER       {current.warnings    = NUM_VALUE_IN($2);}
 350                 | FETCHLIMIT NUMBER     {current.fetchlimit  = NUM_VALUE_IN($2);}
 351                 | BATCHLIMIT NUMBER     {current.batchlimit  = NUM_VALUE_IN($2);}
 352                 | EXPUNGE NUMBER        {current.expunge     = NUM_VALUE_IN($2);}
 353
 354                 | PROPERTIES STRING     {current.properties  = xstrdup($2);}
 355                 ;
 356 %%
 357
 358 /* lexer interface */
 359 extern char *rcfile;
 360 extern int prc_lineno;
 361 extern char *yytext;
 362 extern FILE *yyin;
 363
 364 static struct query *hosttail;  /* where to add new elements */
 365
 366 void yyerror (const char *s)
 367 /* report a syntax error */
 368 {
 369     report_at_line(stderr, 0, rcfile, prc_lineno, _("%s at %s"), s,
 370                    (yytext && yytext[0]) ? yytext : _("end of input"));
 371     prc_errflag++;
 372 }
 373
 374 int prc_filecheck(const char *pathname, const flag securecheck)
 375 /* check that a configuration file is secure */
 376 {
 377 #ifndef __EMX__
 378     struct stat statbuf;
 379
 380     errno = 0;
 381
 382     /* special case useful for debugging purposes */
 383     if (strcmp("/dev/null", pathname) == 0)
 384         return(PS_SUCCESS);
 385
 386     /* pass through the special name for stdin */
 387     if (strcmp("-", pathname) == 0)
 388         return(PS_SUCCESS);
 389
 390     /* the run control file must have the same uid as the REAL uid of this
 391        process, it must have permissions no greater than 600, and it must not
 392        be a symbolic link.  We check these conditions here. */
 393
 394     if (lstat(pathname, &statbuf) < 0) {
 395         if (errno == ENOENT)
 396             return(PS_SUCCESS);
 397         else {
 398             report(stderr, "lstat: %s: %s\n", pathname, strerror(errno));
 399             return(PS_IOERR);
 400         }
 401     }
 402
 403     if (!securecheck)   return PS_SUCCESS;
 404
 405     if ((statbuf.st_mode & S_IFLNK) == S_IFLNK)
 406     {
 407         fprintf(stderr, _("File %s must not be a symbolic link.\n"), pathname);
 408         return(PS_IOERR);
 409     }
 410
 411 #ifndef __BEOS__
 412     if (statbuf.st_mode & ~(S_IFREG | S_IREAD | S_IWRITE | S_IEXEC | S_IXGRP))
 413     {
 414         fprintf(stderr, _("File %s must have no more than -rwx--x--- (0710) permissions.\n"),
 415                 pathname);
 416         return(PS_IOERR);
 417     }
 418 #endif /* __BEOS__ */
 419
 420 #ifdef HAVE_GETEUID
 421     if (statbuf.st_uid != geteuid())
 422 #else
 423     if (statbuf.st_uid != getuid())
 424 #endif /* HAVE_GETEUID */
 425     {
 426         fprintf(stderr, _("File %s must be owned by you.\n"), pathname);
 427         return(PS_IOERR);
 428     }
 429 #endif
 430     return(PS_SUCCESS);
 431 }
 432
 433 int prc_parse_file (const char *pathname, const flag securecheck)
 434 /* digest the configuration into a linked list of host records */
 435 {
 436     prc_errflag = 0;
 437     querylist = hosttail = (struct query *)NULL;
 438
 439     errno = 0;
 440
 441     /* Check that the file is secure */
 442     if ( (prc_errflag = prc_filecheck(pathname, securecheck)) != 0 )
 443         return(prc_errflag);
 444
 445     /*
 446      * Croak if the configuration directory does not exist.
 447      * This probably means an NFS mount failed and we can't
 448      * see a configuration file that ought to be there.
 449      * Question: is this a portable check? It's not clear
 450      * that all implementations of lstat() will return ENOTDIR
 451      * rather than plain ENOENT in this case...
 452      */
 453     if (errno == ENOTDIR)
 454         return(PS_IOERR);
 455     else if (errno == ENOENT)
 456         return(PS_SUCCESS);
 457
 458     /* Open the configuration file and feed it to the lexer. */
 459     if (strcmp(pathname, "-") == 0)
 460         yyin = stdin;
 461     else if ((yyin = fopen(pathname,"r")) == (FILE *)NULL) {
 462         report(stderr, "open: %s: %s\n", pathname, strerror(errno));
 463         return(PS_IOERR);
 464     }
 465
 466     yyparse();          /* parse entire file */
 467
 468     fclose(yyin);       /* not checking this should be safe, file mode was r */
 469
 470     if (prc_errflag)
 471         return(PS_SYNTAX);
 472     else
 473         return(PS_SUCCESS);
 474 }
 475
 476 static void reset_server(const char *name, int skip)
 477 /* clear the entire global record and initialize it with a new name */
 478 {
 479     trailer = FALSE;
 480     memset(&current,'\0',sizeof(current));
 481     current.smtp_socket = -1;
 482     current.server.pollname = xstrdup(name);
 483     current.server.skip = skip;
 484     current.server.principal = (char *)NULL;
 485 }
 486
 487
 488 static void user_reset(void)
 489 /* clear the global current record (user parameters) used by the parser */
 490 {
 491     struct hostdata save;
 492
 493     /*
 494      * Purpose of this code is to initialize the new server block, but
 495      * preserve whatever server name was previously set.  Also
 496      * preserve server options unless the command-line explicitly
 497      * overrides them.
 498      */
 499     save = current.server;
 500
 501     memset(&current, '\0', sizeof(current));
 502     current.smtp_socket = -1;
 503
 504     current.server = save;
 505 }
 506
 507 struct query *hostalloc(init)
 508 /* append a host record to the host list */
 509 struct query *init;     /* pointer to block containing initial values */
 510 {
 511     struct query *node;
 512
 513     /* allocate new node */
 514     node = (struct query *) xmalloc(sizeof(struct query));
 515
 516     /* initialize it */
 517     if (init)
 518         memcpy(node, init, sizeof(struct query));
 519     else
 520     {
 521         memset(node, '\0', sizeof(struct query));
 522         node->smtp_socket = -1;
 523     }
 524
 525     /* append to end of list */
 526     if (hosttail != (struct query *) 0)
 527         hosttail->next = node;  /* list contains at least one element */
 528     else
 529         querylist = node;       /* list is empty */
 530     hosttail = node;
 531
 532     if (trailer)
 533         node->server.lead_server = leadentry;
 534     else
 535     {
 536         node->server.lead_server = NULL;
 537         leadentry = &node->server;
 538     }
 539
 540     return(node);
 541 }
 542
 543 static void record_current(void)
 544 /* register current parameters and append to the host list */
 545 {
 546     (void) hostalloc(&current);
 547     trailer = TRUE;
 548 }
 549
 550 /* easier to do this than cope with variations in where the library lives */
 551 int yywrap(void) {return 1;}
 552
 553 /* rcfile_y.y ends here */
 554
 555