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 static char SccsId[] = "@(#)conf.c 3.35 10/22/81"; 40 41 42 # include <whoami.h> /* definitions of machine id's at berkeley */ 43 44 45 /* 46 ** Header info table 47 ** Final (null) entry contains the flags used for any other field. 48 ** 49 ** Not all of these are actually handled specially by sendmail 50 ** at this time. They are included as placeholders, to let 51 ** you know that "someday" I intend to have sendmail do 52 ** something with them. 53 */ 54 55 struct hdrinfo HdrInfo[] = 56 { 57 "date", H_CHECK, M_NEEDDATE, 58 "from", H_CHECK, M_NEEDFROM, 59 "original-from", 0, 0, 60 "sender", 0, 0, 61 "full-name", H_ACHECK, M_FULLNAME, 62 "to", H_ADDR, 0, 63 "cc", H_ADDR, 0, 64 "bcc", H_ADDR|H_ACHECK, 0, 65 "message-id", H_CHECK, M_MSGID, 66 "message", H_EOH, 0, 67 "text", H_EOH, 0, 68 "posted-date", 0, 0, 69 "return-receipt-to", 0, 0, 70 "received-date", H_CHECK, M_LOCAL, 71 "received-from", H_CHECK, M_LOCAL, 72 "precedence", 0, 0, 73 "via", H_FORCE, 0, 74 NULL, 0, 0, 75 }; 76 77 78 /* 79 ** ARPANET error message numbers. 80 */ 81 82 # ifdef NEWFTP 83 /* these are almost all unchecked */ 84 char Arpa_Info[] = "010"; /* arbitrary info: this is WRONG! */ 85 char Arpa_Enter[] = "354"; /* start mail input */ 86 char Arpa_Mmsg[] = "250"; /* mail successful (MAIL cmd) */ 87 char Arpa_Fmsg[] = "250"; /* mail successful (MLFL cmd) */ 88 char Arpa_Syserr[] = "450"; /* some (transient) system error */ 89 char Arpa_Usrerr[] = "550"; /* some (fatal) user error */ 90 # else NEWFTP 91 char Arpa_Info[] = "050"; /* arbitrary info */ 92 char Arpa_Enter[] = "350"; /* start mail input */ 93 char Arpa_Mmsg[] = "256"; /* mail successful (MAIL cmd) */ 94 char Arpa_Fmsg[] = "250"; /* mail successful (MLFL cmd) */ 95 char Arpa_Syserr[] = "455"; /* some (transient) system error */ 96 char Arpa_Usrerr[] = "450"; /* some (fatal) user error */ 97 # endif NEWFTP 98 99 100 101 102 103 /* 104 ** Location of system files/databases/etc. 105 */ 106 107 char *AliasFile = "/usr/lib/aliases"; /* alias file */ 108 char *ConfFile = "/usr/lib/sendmail.cf"; /* runtime configuration */ 109 char *StatFile = "/usr/lib/mailstats"; /* statistics summary */ 110 char *HelpFile = "/usr/lib/sendmail.hf"; /* help file */ 111 112 113 /* 114 ** Other configuration. 115 */ 116 117 int DefUid = 1; /* the uid to execute mailers as */ 118 int DefGid = 1; /* ditto for gid */ 119 120 121 122 /* 123 ** V6 system configuration. 124 */ 125 126 # ifdef V6 127 char *StdTimezone = "PST"; /* std time timezone */ 128 char *DstTimezone = "PDT"; /* daylight time timezone */ 129 # endif V6 130 131 # ifdef V6 132 /* 133 ** TTYNAME -- return name of terminal. 134 ** 135 ** Parameters: 136 ** fd -- file descriptor to check. 137 ** 138 ** Returns: 139 ** pointer to full path of tty. 140 ** NULL if no tty. 141 ** 142 ** Side Effects: 143 ** none. 144 */ 145 146 char * 147 ttyname(fd) 148 int fd; 149 { 150 register char tn; 151 static char pathn[] = "/dev/ttyx"; 152 153 /* compute the pathname of the controlling tty */ 154 if ((tn = ttyn(fd)) == NULL) 155 { 156 errno = 0; 157 return (NULL); 158 } 159 pathn[8] = tn; 160 return (pathn); 161 } 162 /* 163 ** FDOPEN -- Open a stdio file given an open file descriptor. 164 ** 165 ** This is included here because it is standard in v7, but we 166 ** need it in v6. 167 ** 168 ** Algorithm: 169 ** Open /dev/null to create a descriptor. 170 ** Close that descriptor. 171 ** Copy the existing fd into the descriptor. 172 ** 173 ** Parameters: 174 ** fd -- the open file descriptor. 175 ** type -- "r", "w", or whatever. 176 ** 177 ** Returns: 178 ** The file descriptor it creates. 179 ** 180 ** Side Effects: 181 ** none 182 ** 183 ** Called By: 184 ** deliver 185 ** 186 ** Notes: 187 ** The mode of fd must match "type". 188 */ 189 190 FILE * 191 fdopen(fd, type) 192 int fd; 193 char *type; 194 { 195 register FILE *f; 196 197 f = fopen("/dev/null", type); 198 (void) close(fileno(f)); 199 fileno(f) = fd; 200 return (f); 201 } 202 /* 203 ** INDEX -- Return pointer to character in string 204 ** 205 ** For V7 compatibility. 206 ** 207 ** Parameters: 208 ** s -- a string to scan. 209 ** c -- a character to look for. 210 ** 211 ** Returns: 212 ** If c is in s, returns the address of the first 213 ** instance of c in s. 214 ** NULL if c is not in s. 215 ** 216 ** Side Effects: 217 ** none. 218 */ 219 220 char * 221 index(s, c) 222 register char *s; 223 register char c; 224 { 225 while (*s != '\0') 226 { 227 if (*s++ == c) 228 return (--s); 229 } 230 return (NULL); 231 } 232 /* 233 ** UMASK -- fake the umask system call. 234 ** 235 ** Since V6 always acts like the umask is zero, we will just 236 ** assume the same thing. 237 */ 238 239 /*ARGSUSED*/ 240 umask(nmask) 241 { 242 return (0); 243 } 244 245 246 /* 247 ** GETRUID -- get real user id. 248 */ 249 250 getruid() 251 { 252 return (getuid() & 0377); 253 } 254 255 256 /* 257 ** GETRGID -- get real group id. 258 */ 259 260 getrgid() 261 { 262 return (getgid() & 0377); 263 } 264 265 266 /* 267 ** GETEUID -- get effective user id. 268 */ 269 270 geteuid() 271 { 272 return ((getuid() >> 8) & 0377); 273 } 274 275 276 /* 277 ** GETEGID -- get effective group id. 278 */ 279 280 getegid() 281 { 282 return ((getgid() >> 8) & 0377); 283 } 284 285 # endif V6 286 287 # ifndef V6 288 289 /* 290 ** GETRUID -- get real user id (V7) 291 */ 292 293 getruid() 294 { 295 if (Daemon) 296 return (RealUid); 297 else 298 return (getuid()); 299 } 300 301 302 /* 303 ** GETRGID -- get real group id (V7). 304 */ 305 306 getrgid() 307 { 308 if (Daemon) 309 return (RealGid); 310 else 311 return (getgid()); 312 } 313 314 # endif V6 315 /* 316 ** TTYPATH -- Get the path of the user's tty 317 ** 318 ** Returns the pathname of the user's tty. Returns NULL if 319 ** the user is not logged in or if s/he has write permission 320 ** denied. 321 ** 322 ** Parameters: 323 ** none 324 ** 325 ** Returns: 326 ** pathname of the user's tty. 327 ** NULL if not logged in or write permission denied. 328 ** 329 ** Side Effects: 330 ** none. 331 ** 332 ** WARNING: 333 ** Return value is in a local buffer. 334 ** 335 ** Called By: 336 ** savemail 337 */ 338 339 # include <sys/stat.h> 340 341 char * 342 ttypath() 343 { 344 struct stat stbuf; 345 register char *pathn; 346 extern char *ttyname(); 347 extern char *getlogin(); 348 349 /* compute the pathname of the controlling tty */ 350 if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL && (pathn = ttyname(0)) == NULL) 351 { 352 errno = 0; 353 return (NULL); 354 } 355 356 /* see if we have write permission */ 357 if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode)) 358 { 359 errno = 0; 360 return (NULL); 361 } 362 363 /* see if the user is logged in */ 364 if (getlogin() == NULL) 365 return (NULL); 366 367 /* looks good */ 368 return (pathn); 369 } 370 /* 371 ** CHECKCOMPAT -- check for From and To person compatible. 372 ** 373 ** This routine can be supplied on a per-installation basis 374 ** to determine whether a person is allowed to send a message. 375 ** This allows restriction of certain types of internet 376 ** forwarding or registration of users. 377 ** 378 ** If the hosts are found to be incompatible, an error 379 ** message should be given using "usrerr" and FALSE should 380 ** be returned. 381 ** 382 ** 'NoReturn' can be set to suppress the return-to-sender 383 ** function; this should be done on huge messages. 384 ** 385 ** Parameters: 386 ** to -- the person being sent to. 387 ** 388 ** Returns: 389 ** TRUE -- ok to send. 390 ** FALSE -- not ok. 391 ** 392 ** Side Effects: 393 ** none (unless you include the usrerr stuff) 394 */ 395 396 bool 397 checkcompat(to) 398 register ADDRESS *to; 399 { 400 register STAB *s; 401 402 if (to->q_mailer != MN_LOCAL && MsgSize > 100000) 403 { 404 usrerr("Message exceeds 100000 bytes"); 405 NoReturn++; 406 return (FALSE); 407 } 408 # ifdef ING70 409 s = stab("arpa", ST_MAILER, ST_FIND); 410 if (s != NULL && From.q_mailer != MN_LOCAL && to->q_mailer == s->s_mailer->m_mno) 411 { 412 usrerr("No ARPA mail through this machine: see your system administration"); 413 return (FALSE); 414 } 415 # endif ING70 416 return (TRUE); 417 } 418