1: /* rcvtty.c - a rcvmail program (a lot like rcvalert) handling IPC ttys */
   2: 
   3: #include "../h/mh.h"
   4: #include "../h/rcvmail.h"
   5: #include "../h/scansbr.h"
   6: #include "../zotnet/tws.h"
   7: #include <signal.h>
   8: #include <sys/stat.h>
   9: #ifndef TTYD
  10: #include <utmp.h>
  11: #endif	not TTYD
  12: 
  13: /*  */
  14: 
  15: static struct swit switches[] = {
  16: #define HELPSW  0
  17:     "help", 4,
  18: 
  19:     NULL, NULL
  20: };
  21: 
  22: /*  */
  23: 
  24: static  jmp_buf myctx;
  25: 
  26: long    lseek ();
  27: char   *getusr ();
  28: 
  29: /*  */
  30: 
  31: /* ARGSUSED */
  32: 
  33: main (argc, argv)
  34: int     argc;
  35: char   **argv;
  36: {
  37:     int     md,
  38:         vecp = 0;
  39:     char   *cp,
  40:            *user,
  41:             buf[100],
  42:           **ap,
  43:           **argp,
  44:            *arguments[MAXARGS],
  45:        *vec[MAXARGS];
  46: #ifndef TTYD
  47:     char    tty[BUFSIZ];
  48:     struct utmp ut;
  49:     register FILE  *uf;
  50: #endif	not TTYD
  51: 
  52:     invo_name = r1bindex (argv[0], '/');
  53:     mts_init (invo_name);
  54:     if ((cp = m_find (invo_name)) != NULL) {
  55:     ap = brkstring (cp = getcpy (cp), " ", "\n");
  56:     ap = copyip (ap, arguments);
  57:     }
  58:     else
  59:     ap = arguments;
  60:     (void) copyip (argv + 1, ap);
  61:     argp = arguments;
  62: 
  63: /*  */
  64: 
  65:     while (cp = *argp++) {
  66:     if (*cp == '-')
  67:         switch (smatch (++cp, switches)) {
  68:         case AMBIGSW:
  69:             ambigsw (cp, switches);
  70:             done (1);
  71:         case UNKWNSW:
  72:             vec[vecp++] = --cp;
  73:             continue;
  74:         case HELPSW:
  75:             (void) sprintf (buf, "%s [command ...]", invo_name);
  76:             help (buf, switches);
  77:             done (1);
  78:         }
  79:     vec[vecp++] = cp;
  80:     }
  81:     vec[vecp] = 0;
  82: 
  83: /*  */
  84: 
  85:     if ((md = vecp ? message_fd (vec) : header_fd ()) == NOTOK)
  86:     exit (RCV_MBX);
  87: 
  88:     user = getusr ();
  89: #ifndef TTYD
  90:     if ((uf = fopen ("/etc/utmp", "r")) == NULL)
  91:     exit (RCV_MBX);
  92:     while (fread ((char *) &ut, sizeof ut, 1, uf) == 1)
  93:     if (ut.ut_name[0] != NULL
  94:         && strncmp (user, ut.ut_name, sizeof ut.ut_name) == 0) {
  95:         (void) strncpy (tty, ut.ut_line, sizeof ut.ut_line);
  96:         alert (tty, md);
  97:     }
  98:     (void) fclose (uf);
  99: #else   TTYD
 100:     alert (user, md);
 101: #endif	TTYD
 102: 
 103:     exit (RCV_MOK);
 104: }
 105: 
 106: /*  */
 107: 
 108: /* ARGSUSED */
 109: 
 110: static  int alrmser (i)
 111: int     i;
 112: {
 113:     longjmp (myctx, DONE);
 114: }
 115: 
 116: 
 117: static int  message_fd (vec)
 118: char   *vec[];
 119: {
 120:     int     bytes,
 121:         child_id,
 122:             fd;
 123:     char    tmpfil[BUFSIZ];
 124:     struct stat st;
 125: 
 126:     (void) unlink (mktemp (strcpy (tmpfil, "/tmp/rcvttyXXXXX")));
 127:     if ((fd = creat (tmpfil, 0600)) == NOTOK)
 128:     return header_fd ();
 129:     (void) close (fd);
 130: 
 131:     if ((fd = open (tmpfil, 2)) == NOTOK)
 132:     return header_fd ();
 133:     (void) unlink (tmpfil);
 134: 
 135: /*  */
 136: 
 137:     switch (child_id = vfork ()) {
 138:     case NOTOK:
 139:         (void) close (fd);
 140:         return header_fd ();
 141: 
 142:     case OK:
 143:         rewind (stdin);
 144:         if (dup2 (fd, 1) == NOTOK || dup2 (fd, 2) == NOTOK)
 145:         _exit (-1);
 146:         closefds (3);
 147: #ifdef  BSD42
 148:         (void) setpgrp (0, getpid ());
 149: #endif	BSD42
 150:         execvp (vec[0], vec);
 151:         _exit (-1);
 152: 
 153:     default:
 154:         switch (setjmp (myctx)) {
 155:         case OK:
 156:             (void) signal (SIGALRM, alrmser);
 157:             bytes = fstat (fileno (stdin), &st) != NOTOK
 158:             ? (int) st.st_size : 100;
 159:             if (bytes <= 0)
 160:             bytes = 100;
 161:             (void) alarm ((unsigned) (bytes * 60 + 300));
 162: 
 163:             (void) pidwait (child_id, OK);
 164: 
 165:             (void) alarm (0);
 166:             if (fstat (fd, &st) != NOTOK && st.st_size > 0L)
 167:             return fd;
 168:             (void) close (fd);
 169:             return header_fd ();
 170: 
 171:         default:
 172: #ifndef BSD42
 173:             (void) kill (child_id, SIGKILL);
 174: #else   BSD42
 175:             (void) killpg (child_id, SIGKILL);
 176: #endif	BSD42
 177:             (void) close (fd);
 178:             return header_fd ();
 179:         }
 180:     }
 181: }
 182: 
 183: /*  */
 184: 
 185: static int  header_fd () {
 186:     int     fd;
 187:     char    tmpfil[BUFSIZ];
 188: 
 189:     (void) strcpy (tmpfil, m_tmpfil (invo_name));
 190:     if ((fd = creat (tmpfil, 0600)) == NOTOK)
 191:     return NOTOK;
 192:     (void) close (fd);
 193: 
 194:     if ((fd = open (tmpfil, 2)) == NOTOK)
 195:     return NOTOK;
 196:     (void) unlink (tmpfil);
 197: 
 198:     rewind (stdin);
 199:     (void) scan (stdin, 0, 0, NULLVP, 0, 0, 0, 0L, 0);
 200:     (void) write (fd, scanl, strlen (scanl));
 201: 
 202:     return fd;
 203: }
 204: 
 205: /*  */
 206: 
 207: #ifndef TTYD
 208: static  alert (tty, md)
 209: register char   *tty;
 210: int     md;
 211: {
 212:     int     i,
 213:             td;
 214:     char    buffer[BUFSIZ],
 215:             ttyspec[BUFSIZ];
 216:     struct stat st;
 217: 
 218:     (void) sprintf (ttyspec, "/dev/%s", tty);
 219:     if (stat (ttyspec, &st) == NOTOK || (st.st_mode & 02) == 0)
 220:     return;
 221: 
 222:     switch (setjmp (myctx)) {
 223:     case OK:
 224:         (void) signal (SIGALRM, alrmser);
 225:         (void) alarm (2);
 226:         td = open (ttyspec, 1);
 227:         (void) alarm (0);
 228:         if (td == NOTOK)
 229:         return;
 230:         break;
 231: 
 232:     default:
 233:         (void) alarm (0);
 234:         return;
 235:     }
 236: 
 237:     (void) lseek (md, 0L, 0);
 238: 
 239:     while ((i = read (md, buffer, sizeof buffer)) > 0)
 240:     if (write (td, buffer, i) != i)
 241:         break;
 242: 
 243:     (void) close (td);
 244: }
 245: #else   TTYD
 246: 
 247: /*  */
 248: 
 249: static  alert (user, md)
 250: register char   *user;
 251: int     md;
 252: {
 253:     int     i,
 254:             td;
 255:     char    buffer[BUFSIZ];
 256: 
 257:     if ((td = ttyw ("notify", NULLCP, NULLCP, user)) == NOTOK)
 258:     return;
 259:     (void) signal (SIGPIPE, SIG_IGN);
 260: 
 261:     (void) lseek (md, 0L, 0);
 262:     while ((i = read (md, buffer, sizeof buffer)) > 0)
 263:     if (write (td, buffer, i) != i)
 264:         break;
 265: 
 266:     (void) close (td);
 267: }
 268: #endif	TTYD

Defined functions

alert defined in line 249; used 2 times
alrmser defined in line 110; used 2 times
header_fd defined in line 185; used 6 times
main defined in line 33; never used
message_fd defined in line 117; used 1 times
  • in line 85

Defined variables

myctx defined in line 24; used 3 times
switches defined in line 15; used 3 times

Defined macros

HELPSW defined in line 16; never used
Last modified: 1985-12-20
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