1 # include <pwd.h> 2 # include "sendmail.h" 3 4 /* 5 ** CONF.C -- Sendmail Configuration Tables. 6 ** 7 ** Defines the configuration of this installation. 8 ** 9 ** Compilation Flags: 10 ** V6 -- running on a version 6 system. This determines 11 ** whether to define certain routines between 12 ** the two systems. If you are running a funny 13 ** system, e.g., V6 with long tty names, this 14 ** should be checked carefully. 15 ** 16 ** Configuration Variables: 17 ** HdrInfo -- a table describing well-known header fields. 18 ** Each entry has the field name and some flags, 19 ** which are described in sendmail.h. 20 ** StdTimezone -- name of local timezone in standard time 21 ** (V6 only). 22 ** DstTimezone -- name of local timezone in daylight savings 23 ** time (V6 only). 24 ** 25 ** Notes: 26 ** I have tried to put almost all the reasonable 27 ** configuration information into the configuration 28 ** file read at runtime. My intent is that anything 29 ** here is a function of the version of UNIX you 30 ** are running, or is really static -- for example 31 ** the headers are a superset of widely used 32 ** protocols. If you find yourself playing with 33 ** this file too much, you may be making a mistake! 34 */ 35 36 37 38 39 SCCSID(@(#)conf.c 3.57 09/24/82); 40 41 42 43 /* 44 ** Header info table 45 ** Final (null) entry contains the flags used for any other field. 46 ** 47 ** Not all of these are actually handled specially by sendmail 48 ** at this time. They are included as placeholders, to let 49 ** you know that "someday" I intend to have sendmail do 50 ** something with them. 51 */ 52 53 struct hdrinfo HdrInfo[] = 54 { 55 /* date information */ 56 "posted-date", 0, 0, 57 "date", H_CHECK, M_NEEDDATE, 58 "resent-date", 0, 0, 59 "received-date", H_CHECK, M_LOCAL, 60 /* originator fields, most to least significant */ 61 "resent-sender", H_FROM, 0, 62 "resent-from", H_FROM, 0, 63 "sender", H_FROM, 0, 64 "from", H_FROM|H_CHECK, M_NEEDFROM, 65 "full-name", H_ACHECK, M_FULLNAME, 66 "received-from", H_CHECK, M_LOCAL, 67 "return-receipt-to", H_FROM, 0, 68 "errors-to", H_FROM, 0, 69 /* destination fields */ 70 "to", H_RCPT, 0, 71 "resent-to", H_RCPT, 0, 72 "cc", H_RCPT, 0, 73 "resent-cc", H_RCPT, 0, 74 "bcc", H_RCPT, 0, 75 "resent-bcc", H_RCPT, 0, 76 /* message identification and control */ 77 "message-id", 0, 0, 78 "resent-message-id", 0, 0, 79 "precedence", 0, 0, 80 "message", H_EOH, 0, 81 "text", H_EOH, 0, 82 /* trace fields */ 83 "received", H_TRACE|H_FORCE, 0, 84 "via", H_TRACE|H_FORCE, 0, 85 "mail-from", H_TRACE|H_FORCE, 0, 86 87 NULL, 0, 0, 88 }; 89 90 91 /* 92 ** ARPANET error message numbers. 93 */ 94 95 char Arpa_Info[] = "050"; /* arbitrary info */ 96 char Arpa_TSyserr[] = "451"; /* some (transient) system error */ 97 char Arpa_PSyserr[] = "554"; /* some (permanent) system error */ 98 char Arpa_Usrerr[] = "554"; /* some (fatal) user error */ 99 100 101 102 103 104 /* 105 ** Location of system files/databases/etc. 106 */ 107 108 char *AliasFile = "/usr/lib/aliases"; /* alias file */ 109 char *ConfFile = "/usr/lib/sendmail.cf"; /* runtime configuration */ 110 char *StatFile = "/usr/lib/sendmail.st"; /* statistics summary */ 111 char *HelpFile = "/usr/lib/sendmail.hf"; /* help file */ 112 # ifdef QUEUE 113 char *QueueDir = "/usr/spool/mqueue"; /* queue of saved mail */ 114 # else QUEUE 115 char *QueueDir = "/tmp"; /* location of temp files */ 116 # endif QUEUE 117 char *XcriptFile = "/tmp/mailxXXXXXX"; /* template for transcript */ 118 119 120 /* 121 ** Other configuration. 122 */ 123 124 int DefUid = 1; /* the uid to execute mailers as */ 125 int DefGid = 1; /* ditto for gid */ 126 time_t TimeOut = 3*24*60*60L; /* default timeout for queue files */ 127 int ReadTimeout = 10*60; /* timeout on external reads */ 128 int LogLevel = 9; /* default logging level */ 129 130 131 132 /* 133 ** V6 system configuration. 134 */ 135 136 # ifdef V6 137 char *StdTimezone = "PST"; /* std time timezone */ 138 char *DstTimezone = "PDT"; /* daylight time timezone */ 139 # endif V6 140 141 # ifdef V6 142 /* 143 ** TTYNAME -- return name of terminal. 144 ** 145 ** Parameters: 146 ** fd -- file descriptor to check. 147 ** 148 ** Returns: 149 ** pointer to full path of tty. 150 ** NULL if no tty. 151 ** 152 ** Side Effects: 153 ** none. 154 */ 155 156 char * 157 ttyname(fd) 158 int fd; 159 { 160 register char tn; 161 static char pathn[] = "/dev/ttyx"; 162 163 /* compute the pathname of the controlling tty */ 164 if ((tn = ttyn(fd)) == NULL) 165 { 166 errno = 0; 167 return (NULL); 168 } 169 pathn[8] = tn; 170 return (pathn); 171 } 172 /* 173 ** FDOPEN -- Open a stdio file given an open file descriptor. 174 ** 175 ** This is included here because it is standard in v7, but we 176 ** need it in v6. 177 ** 178 ** Algorithm: 179 ** Open /dev/null to create a descriptor. 180 ** Close that descriptor. 181 ** Copy the existing fd into the descriptor. 182 ** 183 ** Parameters: 184 ** fd -- the open file descriptor. 185 ** type -- "r", "w", or whatever. 186 ** 187 ** Returns: 188 ** The file descriptor it creates. 189 ** 190 ** Side Effects: 191 ** none 192 ** 193 ** Called By: 194 ** deliver 195 ** 196 ** Notes: 197 ** The mode of fd must match "type". 198 */ 199 200 FILE * 201 fdopen(fd, type) 202 int fd; 203 char *type; 204 { 205 register FILE *f; 206 207 f = fopen("/dev/null", type); 208 (void) close(fileno(f)); 209 fileno(f) = fd; 210 return (f); 211 } 212 /* 213 ** INDEX -- Return pointer to character in string 214 ** 215 ** For V7 compatibility. 216 ** 217 ** Parameters: 218 ** s -- a string to scan. 219 ** c -- a character to look for. 220 ** 221 ** Returns: 222 ** If c is in s, returns the address of the first 223 ** instance of c in s. 224 ** NULL if c is not in s. 225 ** 226 ** Side Effects: 227 ** none. 228 */ 229 230 char * 231 index(s, c) 232 register char *s; 233 register char c; 234 { 235 while (*s != '\0') 236 { 237 if (*s++ == c) 238 return (--s); 239 } 240 return (NULL); 241 } 242 /* 243 ** UMASK -- fake the umask system call. 244 ** 245 ** Since V6 always acts like the umask is zero, we will just 246 ** assume the same thing. 247 */ 248 249 /*ARGSUSED*/ 250 umask(nmask) 251 { 252 return (0); 253 } 254 255 256 /* 257 ** GETRUID -- get real user id. 258 */ 259 260 getruid() 261 { 262 return (getuid() & 0377); 263 } 264 265 266 /* 267 ** GETRGID -- get real group id. 268 */ 269 270 getrgid() 271 { 272 return (getgid() & 0377); 273 } 274 275 276 /* 277 ** GETEUID -- get effective user id. 278 */ 279 280 geteuid() 281 { 282 return ((getuid() >> 8) & 0377); 283 } 284 285 286 /* 287 ** GETEGID -- get effective group id. 288 */ 289 290 getegid() 291 { 292 return ((getgid() >> 8) & 0377); 293 } 294 295 # endif V6 296 297 # ifndef V6 298 299 /* 300 ** GETRUID -- get real user id (V7) 301 */ 302 303 getruid() 304 { 305 if (Mode == MD_DAEMON) 306 return (RealUid); 307 else 308 return (getuid()); 309 } 310 311 312 /* 313 ** GETRGID -- get real group id (V7). 314 */ 315 316 getrgid() 317 { 318 if (Mode == MD_DAEMON) 319 return (RealGid); 320 else 321 return (getgid()); 322 } 323 324 # endif V6 325 /* 326 ** TTYPATH -- Get the path of the user's tty 327 ** 328 ** Returns the pathname of the user's tty. Returns NULL if 329 ** the user is not logged in or if s/he has write permission 330 ** denied. 331 ** 332 ** Parameters: 333 ** none 334 ** 335 ** Returns: 336 ** pathname of the user's tty. 337 ** NULL if not logged in or write permission denied. 338 ** 339 ** Side Effects: 340 ** none. 341 ** 342 ** WARNING: 343 ** Return value is in a local buffer. 344 ** 345 ** Called By: 346 ** savemail 347 */ 348 349 # include <sys/stat.h> 350 351 char * 352 ttypath() 353 { 354 struct stat stbuf; 355 register char *pathn; 356 extern char *ttyname(); 357 extern char *getlogin(); 358 359 /* compute the pathname of the controlling tty */ 360 if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL && (pathn = ttyname(0)) == NULL) 361 { 362 errno = 0; 363 return (NULL); 364 } 365 366 /* see if we have write permission */ 367 if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode)) 368 { 369 errno = 0; 370 return (NULL); 371 } 372 373 /* see if the user is logged in */ 374 if (getlogin() == NULL) 375 return (NULL); 376 377 /* looks good */ 378 return (pathn); 379 } 380 /* 381 ** CHECKCOMPAT -- check for From and To person compatible. 382 ** 383 ** This routine can be supplied on a per-installation basis 384 ** to determine whether a person is allowed to send a message. 385 ** This allows restriction of certain types of internet 386 ** forwarding or registration of users. 387 ** 388 ** If the hosts are found to be incompatible, an error 389 ** message should be given using "usrerr" and FALSE should 390 ** be returned. 391 ** 392 ** 'NoReturn' can be set to suppress the return-to-sender 393 ** function; this should be done on huge messages. 394 ** 395 ** Parameters: 396 ** to -- the person being sent to. 397 ** 398 ** Returns: 399 ** TRUE -- ok to send. 400 ** FALSE -- not ok. 401 ** 402 ** Side Effects: 403 ** none (unless you include the usrerr stuff) 404 */ 405 406 bool 407 checkcompat(to) 408 register ADDRESS *to; 409 { 410 # ifdef ING70 411 register STAB *s; 412 # endif ING70 413 414 if (to->q_mailer != LocalMailer && CurEnv->e_msgsize > 100000) 415 { 416 usrerr("Message exceeds 100000 bytes"); 417 NoReturn++; 418 return (FALSE); 419 } 420 # ifdef ING70 421 s = stab("arpa", ST_MAILER, ST_FIND); 422 if (s != NULL && CurEnv->e_from.q_mailer != LocalMailer && to->q_mailer == s->s_mailer) 423 { 424 usrerr("No ARPA mail through this machine: see your system administration"); 425 return (FALSE); 426 } 427 # endif ING70 428 return (TRUE); 429 } 430