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 3.53 08/17/82); 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", H_CHECK, M_NEEDDATE, 56 "from", H_ADDR|H_FROM|H_CHECK, M_NEEDFROM, 57 "original-from", 0, 0, 58 "sender", H_ADDR, 0, 59 "full-name", H_ACHECK, M_FULLNAME, 60 "to", H_ADDR|H_RCPT, 0, 61 "cc", H_ADDR|H_RCPT, 0, 62 "bcc", H_ADDR|H_RCPT, 0, 63 "message-id", 0, 0, 64 "message", H_EOH, 0, 65 "text", H_EOH, 0, 66 "posted-date", 0, 0, 67 "return-receipt-to", 0, 0, 68 "received-date", H_CHECK, M_LOCAL, 69 "received-from", H_CHECK, M_LOCAL, 70 "precedence", 0, 0, 71 "received", H_FORCE, 0, 72 "via", H_FORCE, 0, 73 NULL, 0, 0, 74 }; 75 76 77 /* 78 ** ARPANET error message numbers. 79 */ 80 81 char Arpa_Info[] = "050"; /* arbitrary info */ 82 char Arpa_Syserr[] = "451"; /* some (transient) system error */ 83 char Arpa_Usrerr[] = "554"; /* some (fatal) user error */ 84 85 86 87 88 89 /* 90 ** Location of system files/databases/etc. 91 */ 92 93 char *AliasFile = "/usr/lib/aliases"; /* alias file */ 94 char *ConfFile = "/usr/lib/sendmail.cf"; /* runtime configuration */ 95 char *StatFile = "/usr/lib/sendmail.st"; /* statistics summary */ 96 char *HelpFile = "/usr/lib/sendmail.hf"; /* help file */ 97 # ifdef QUEUE 98 char *QueueDir = "/usr/spool/mqueue"; /* queue of saved mail */ 99 # else QUEUE 100 char *QueueDir = "/tmp"; /* location of temp files */ 101 # endif QUEUE 102 char *XcriptFile = "/tmp/mailxXXXXXX"; /* template for transcript */ 103 104 105 /* 106 ** Other configuration. 107 */ 108 109 int DefUid = 1; /* the uid to execute mailers as */ 110 int DefGid = 1; /* ditto for gid */ 111 time_t TimeOut = 3*24*60*60L; /* default timeout for queue files */ 112 char *TextTimeOut = "three days"; /* text of above for error messages */ 113 int ReadTimeout = 10*60; /* timeout on external reads */ 114 int LogLevel = 9; /* default logging level */ 115 116 117 118 /* 119 ** V6 system configuration. 120 */ 121 122 # ifdef V6 123 char *StdTimezone = "PST"; /* std time timezone */ 124 char *DstTimezone = "PDT"; /* daylight time timezone */ 125 # endif V6 126 127 # ifdef V6 128 /* 129 ** TTYNAME -- return name of terminal. 130 ** 131 ** Parameters: 132 ** fd -- file descriptor to check. 133 ** 134 ** Returns: 135 ** pointer to full path of tty. 136 ** NULL if no tty. 137 ** 138 ** Side Effects: 139 ** none. 140 */ 141 142 char * 143 ttyname(fd) 144 int fd; 145 { 146 register char tn; 147 static char pathn[] = "/dev/ttyx"; 148 149 /* compute the pathname of the controlling tty */ 150 if ((tn = ttyn(fd)) == NULL) 151 { 152 errno = 0; 153 return (NULL); 154 } 155 pathn[8] = tn; 156 return (pathn); 157 } 158 /* 159 ** FDOPEN -- Open a stdio file given an open file descriptor. 160 ** 161 ** This is included here because it is standard in v7, but we 162 ** need it in v6. 163 ** 164 ** Algorithm: 165 ** Open /dev/null to create a descriptor. 166 ** Close that descriptor. 167 ** Copy the existing fd into the descriptor. 168 ** 169 ** Parameters: 170 ** fd -- the open file descriptor. 171 ** type -- "r", "w", or whatever. 172 ** 173 ** Returns: 174 ** The file descriptor it creates. 175 ** 176 ** Side Effects: 177 ** none 178 ** 179 ** Called By: 180 ** deliver 181 ** 182 ** Notes: 183 ** The mode of fd must match "type". 184 */ 185 186 FILE * 187 fdopen(fd, type) 188 int fd; 189 char *type; 190 { 191 register FILE *f; 192 193 f = fopen("/dev/null", type); 194 (void) close(fileno(f)); 195 fileno(f) = fd; 196 return (f); 197 } 198 /* 199 ** INDEX -- Return pointer to character in string 200 ** 201 ** For V7 compatibility. 202 ** 203 ** Parameters: 204 ** s -- a string to scan. 205 ** c -- a character to look for. 206 ** 207 ** Returns: 208 ** If c is in s, returns the address of the first 209 ** instance of c in s. 210 ** NULL if c is not in s. 211 ** 212 ** Side Effects: 213 ** none. 214 */ 215 216 char * 217 index(s, c) 218 register char *s; 219 register char c; 220 { 221 while (*s != '\0') 222 { 223 if (*s++ == c) 224 return (--s); 225 } 226 return (NULL); 227 } 228 /* 229 ** UMASK -- fake the umask system call. 230 ** 231 ** Since V6 always acts like the umask is zero, we will just 232 ** assume the same thing. 233 */ 234 235 /*ARGSUSED*/ 236 umask(nmask) 237 { 238 return (0); 239 } 240 241 242 /* 243 ** GETRUID -- get real user id. 244 */ 245 246 getruid() 247 { 248 return (getuid() & 0377); 249 } 250 251 252 /* 253 ** GETRGID -- get real group id. 254 */ 255 256 getrgid() 257 { 258 return (getgid() & 0377); 259 } 260 261 262 /* 263 ** GETEUID -- get effective user id. 264 */ 265 266 geteuid() 267 { 268 return ((getuid() >> 8) & 0377); 269 } 270 271 272 /* 273 ** GETEGID -- get effective group id. 274 */ 275 276 getegid() 277 { 278 return ((getgid() >> 8) & 0377); 279 } 280 281 # endif V6 282 283 # ifndef V6 284 285 /* 286 ** GETRUID -- get real user id (V7) 287 */ 288 289 getruid() 290 { 291 if (Mode == MD_DAEMON) 292 return (RealUid); 293 else 294 return (getuid()); 295 } 296 297 298 /* 299 ** GETRGID -- get real group id (V7). 300 */ 301 302 getrgid() 303 { 304 if (Mode == MD_DAEMON) 305 return (RealGid); 306 else 307 return (getgid()); 308 } 309 310 # endif V6 311 /* 312 ** TTYPATH -- Get the path of the user's tty 313 ** 314 ** Returns the pathname of the user's tty. Returns NULL if 315 ** the user is not logged in or if s/he has write permission 316 ** denied. 317 ** 318 ** Parameters: 319 ** none 320 ** 321 ** Returns: 322 ** pathname of the user's tty. 323 ** NULL if not logged in or write permission denied. 324 ** 325 ** Side Effects: 326 ** none. 327 ** 328 ** WARNING: 329 ** Return value is in a local buffer. 330 ** 331 ** Called By: 332 ** savemail 333 */ 334 335 # include <sys/stat.h> 336 337 char * 338 ttypath() 339 { 340 struct stat stbuf; 341 register char *pathn; 342 extern char *ttyname(); 343 extern char *getlogin(); 344 345 /* compute the pathname of the controlling tty */ 346 if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL && (pathn = ttyname(0)) == NULL) 347 { 348 errno = 0; 349 return (NULL); 350 } 351 352 /* see if we have write permission */ 353 if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode)) 354 { 355 errno = 0; 356 return (NULL); 357 } 358 359 /* see if the user is logged in */ 360 if (getlogin() == NULL) 361 return (NULL); 362 363 /* looks good */ 364 return (pathn); 365 } 366 /* 367 ** CHECKCOMPAT -- check for From and To person compatible. 368 ** 369 ** This routine can be supplied on a per-installation basis 370 ** to determine whether a person is allowed to send a message. 371 ** This allows restriction of certain types of internet 372 ** forwarding or registration of users. 373 ** 374 ** If the hosts are found to be incompatible, an error 375 ** message should be given using "usrerr" and FALSE should 376 ** be returned. 377 ** 378 ** 'NoReturn' can be set to suppress the return-to-sender 379 ** function; this should be done on huge messages. 380 ** 381 ** Parameters: 382 ** to -- the person being sent to. 383 ** 384 ** Returns: 385 ** TRUE -- ok to send. 386 ** FALSE -- not ok. 387 ** 388 ** Side Effects: 389 ** none (unless you include the usrerr stuff) 390 */ 391 392 bool 393 checkcompat(to) 394 register ADDRESS *to; 395 { 396 # ifdef ING70 397 register STAB *s; 398 # endif ING70 399 400 if (to->q_mailer != LocalMailer && CurEnv->e_msgsize > 100000) 401 { 402 usrerr("Message exceeds 100000 bytes"); 403 NoReturn++; 404 return (FALSE); 405 } 406 # ifdef ING70 407 s = stab("arpa", ST_MAILER, ST_FIND); 408 if (s != NULL && CurEnv->e_from.q_mailer != LocalMailer && to->q_mailer == s->s_mailer) 409 { 410 usrerr("No ARPA mail through this machine: see your system administration"); 411 return (FALSE); 412 } 413 # endif ING70 414 return (TRUE); 415 } 416