4.3BSD - /usr/src/usr.bin/uucp/mailst.c

   1: #ifndef lint
   2: static char sccsid[] = "@(#)mailst.c	5.6 (Berkeley) 10/9/85";
   3: #endif
   4: 
   5: #include <signal.h>
   6: #include "uucp.h"
   7: #ifdef USG
   8: #include <fcntl.h>
   9: #endif USG
  10: 
  11: /*LINTLIBRARY*/
  12: 
  13: /*
  14:  *	mailst  -  this routine will fork and execute
  15:  *	a mail command sending string (str) to user (user).
  16:  *	If file is non-null, the file is also sent.
  17:  *	(this is used for mail returned to sender.)
  18:  */
  19: 
  20: mailst(user, str, file)
  21: char *user, *str, *file;
  22: {
  23:     register FILE *fp, *fi;
  24:     char buf[BUFSIZ];
  25:     register int c;
  26: 
  27:     sprintf(buf, "%s '%s'", MAIL, user);
  28:     if ((fp = rpopen(buf, "w")) != NULL) {
  29:         fprintf(fp, "From: uucp\nTo: %s\nSubject: %s\n\n", user, str);
  30:         if (file && *file != '\0' && (fi = fopen(subfile(file), "r")) != NULL) {
  31:             while ((c = getc(fi)) != EOF)
  32:                 putc(c, fp);
  33:             putc('\n', fp);
  34:             fclose(fi);
  35:         }
  36:         rpclose(fp);
  37:     }
  38: }
  39: 
  40: /*
  41:  * 'reverting' version of popen
  42:  * which runs process with permissions of real gid/uid
  43:  * rather than the effective gid/uid.
  44:  */
  45: #define tst(a,b)    (*mode == 'r'? (b) : (a))
  46: #define RDR 0
  47: #define WTR 1
  48: static  int popen_pid[20];
  49: 
  50: FILE *
  51: rpopen(cmd, mode)
  52: char    *cmd;
  53: char    *mode;
  54: {
  55:     int p[2];
  56:     register myside, hisside, pid;
  57: 
  58:     if(pipe(p) < 0)
  59:         return NULL;
  60:     myside = tst(p[WTR], p[RDR]);
  61:     hisside = tst(p[RDR], p[WTR]);
  62:     if((pid = fork()) == 0) {
  63:         /* myside and hisside reverse roles in child */
  64:         close(myside);
  65: #ifdef USG
  66:         close(tst(0, 1));
  67:         fcntl(hisside, F_DUPFD, tst(0, 1));
  68: #else !USG
  69:         dup2(hisside, tst(0, 1));
  70: #endif !USG
  71:         close(hisside);
  72:         /* revert permissions */
  73:         setgid(getgid());
  74:         setuid(getuid());
  75:         execl("/bin/sh", "sh", "-c", cmd, (char *)0);
  76:         _exit(1);
  77:     }
  78:     if(pid == -1)
  79:         return NULL;
  80:     popen_pid[myside] = pid;
  81:     close(hisside);
  82:     return(fdopen(myside, mode));
  83: }
  84: 
  85: rpclose(ptr)
  86: FILE *ptr;
  87: {
  88:     register f, r, (*hstat)(), (*istat)(), (*qstat)();
  89:     int status;
  90: 
  91:     f = fileno(ptr);
  92:     fclose(ptr);
  93:     istat = signal(SIGINT, SIG_IGN);
  94:     qstat = signal(SIGQUIT, SIG_IGN);
  95:     hstat = signal(SIGHUP, SIG_IGN);
  96:     while((r = wait(&status)) != popen_pid[f] && r != -1)
  97:         ;
  98:     if(r == -1)
  99:         status = -1;
 100:     signal(SIGINT, istat);
 101:     signal(SIGQUIT, qstat);
 102:     signal(SIGHUP, hstat);
 103:     return status;
 104: }

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