## modules/pa/spawn.c

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## FUNCTIONS

This source file includes following functions.

1. spawn_job

       1 /*  spawn.c
       2
       3     Source file for spawn operations for  PGPsendmail  (wrapper to sendmail).
       4
       5     Copyright (C) 1994-1998  Richard Gooch
       6
       7     This program is free software; you can redistribute it and/or modify
       8     it under the terms of the GNU General Public License as published by
       9     the Free Software Foundation; either version 2 of the License, or
      10     (at your option) any later version.
      11
      12     This program is distributed in the hope that it will be useful,
      13     but WITHOUT ANY WARRANTY; without even the implied warranty of
      14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15     GNU General Public License for more details.
      16
      17     You should have received a copy of the GNU General Public License
      18     along with this program; if not, write to the Free Software
      19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
      20
      21     Richard Gooch may be reached by email at  rgooch@atnf.csiro.au
      22     The postal address is:
      23       Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
      24 */
      25
      26 /*  This programme intercepts messages sent by user mail agents to the
      27     sendmail daemon and checks to see if messages can be encrypted using the
      28     recipient's PGP public keys.
      29
      30
      31     Written by      Richard Gooch   31-MAY-1994
      32
      33     Updated by      Richard Gooch   31-MAY-1994: Extracted from  pgpsendmail.c
      34
      35     Updated by      Richard Gooch   18-JUN-1994: Made error messages more
      36   explicit.
      37
      38     Updated by      Richard Gooch   27-JUN-1994: Copied  set_env  from
      39   pgpdaemon.c
      40
      41     Updated by      Richard Gooch   5-JUL-1994: Changed to use of  m_copy  .
      42
      43     Updated by      Richard Gooch   14-JUL-1994: Moved  copy_data  and  set_env
      44   to  misc.c
      45
      46     Updated by      Richard Gooch   3-DEC-1994: Fixed bug for externally set
      47   error descriptor.
      48
      49     Updated by      Richard Gooch   25-SEP-1997: Used new ERRSTRING macro.
      50
      51     Last updated by Richard Gooch   10-JUL-1998: Removed definitions of system
      52   errlist array.
      53
      54
      55 */
      56 #include <stdio.h>
      57 #include <stdlib.h>
      58 #include <errno.h>
      59 #include <sys/types.h>
      60 #include <unistd.h>
      61 #include <string.h>
      62
      63
      64 /* #include "pgpsendmail.h" */
      65
      66 #define ERRSTRING strerror(errno)
      67
      68 #define LINE_LENGTH 1024
      69 #define STRING_LENGTH 255
      70
      71 int spawn_job (char *path, char *argv[], int *in_fd, int *out_fd, int *err_fd)
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      72 /*  This routine will fork(2) and execvp(2) a process.
      73     The file to execute must be pointed to by  path  .
      74     The NULL terminated list of arguments which will be passed to  main  must
      75     be pointed to by  argv  .
      76     The input file descriptor (fd = 0) for the process must be pointed to by
      77     in_fd  .If the value here is less than 0, then a pipe to the process is
      78     opened and the writeable end is written to the storage pointed to by  in_fd
      79     The standard output file descriptor (fd = 1) for the process must be
      80     pointed to by  out_fd  .If the value here is less than 0, then a pipe to
      81     the process is opened and the readable end is written to the storage
      82     pointed to by  out_fd  .
      83     The standard error output file descriptor (fd = 2) for the process must be
      84     pointed to by  err_fd  .If the value here is less than 0, then a pipe to
      85     the process is opened and the readable end is written to the storage
      86     pointed to by  err_fd  .
      87     The routine returns the child process ID on success, else it returns -1.
      88 */
      89 {
      90     int child_pid;
      91     /*    char txt[LINE_LENGTH]; */
      92     int sd1[2], sd2[2];
      93
      94     if (pipe(sd1) == -1)
      95       {
      96         perror("pipe failed");
      97         return(1);
      98       }
      99     if (pipe(sd2) == -1)
     100       {
     101         perror("pipe failed");
     102         return(1);
     103       }
     104
     105     /*  Fork and exec  */
     106     switch ( child_pid = fork () )
     107     {
     108       case 0:
     109         /*  Child: exec  */
     110         close(sd1[0]);
     111
     112         dup2( sd1[1], 1 );   /* stdout */
     113
     114         dup2( sd1[1], 2 );    /* stderr */
     115
     116         execvp (path, argv);
     117
     118         fprintf (stderr, "Could not exec: \"%s\"\t%s\n", path, ERRSTRING);
     119         exit (1);
     120         break;
     121       case -1:
     122         /*  Error  */
     123         fprintf (stderr, "Could not fork\t%s\n", ERRSTRING);
     124         return (-1);
     125         break;
     126       default:
     127         /*  Parent  */
     128         break;
     129     }
     130     /*  Parent only  */
     131
     132     close(sd1[1]);
     133
     134     dup2 (sd1[0], 0);
     135
     136     /*        printf("Reading child output\n");
     137     while (read(0, txt, 10000) != 0)
     138       printf("child read %s\n", txt);
     139
     140       printf("Finished reading child output\n");  */
     141
     142     return (child_pid);
     143 }   /*  End Function spawn_job  */

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