stunnel-tls/sme9/makesock.c

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <strings.h>

int main(int argc, char *argv[])
{
  int s[2];
  char **args1, **args2;
  int firstarg, lastarg;
  int i;

  if (socketpair(PF_UNIX, SOCK_STREAM, 0, s) < 0)
    {
      fprintf(stderr,"socketpair failed: %s\n",strerror(errno));
      exit(1);
    }

  /* Make this configurable later, but for now it's fine. */

  /* Find the first program to execute. */
  firstarg = 1;
  for(i=1;i<argc;i++)
    {
      if (strcmp(argv[i],"-makesock_connect_to")==0)
        {
          break;
        }
    }
  lastarg = i;
  if ( (args1=malloc((lastarg-firstarg+1) * sizeof(char *))) == NULL)
    {
      fprintf(stderr,"malloc error: %s\n",strerror(errno));
      exit(1);
    }
  for (i=0;i<(lastarg-firstarg);i++)
    {
      args1[i]=argv[firstarg+i];
    }
  args1[i] = NULL;
  
  lastarg++;

  /* Now find the last program to execute. */
  if ( (args2=malloc((argc-lastarg+1) * sizeof(char *))) == NULL)
    {
      fprintf(stderr,"malloc error: %s\n",strerror(errno));
      exit(1);
    }
  for(i=0;i<(argc-lastarg);i++)
    {
      args2[i] = argv[lastarg+i];
    }
  args2[i] = NULL;

  switch(fork())
    {
    case -1:
      /* Error. */
      exit(1);
    case 0:
      /* Child */
      close(s[0]);
      close(0);
      close(1);
      if (dup2(s[1],0) < 0)
        {
          fprintf(stderr,"dup2 error: %s\n",strerror(errno));
          exit(1);
        }
      if (dup2(s[1],1) < 0)
        {
          fprintf(stderr,"dup2 error: %s\n",strerror(errno));
          exit(1);
        }
      if (execvp(args2[0],args2) < 0)
        {
          fprintf(stderr,"execvp error: %s\n",strerror(errno));
          exit(1);
        }
      break;
    default:
      /* Parent */
      if (s[0] != 3)
        {
          close(3);
          if (dup2(s[0],3) < 0)
            {
              fprintf(stderr,"dup2 error: %s\n",strerror(errno));
              exit(1);
            }
          if (fcntl(3,F_SETFD,0) == -1) /* Turn off close-on-exec */
            {
              fprintf(stderr,"fcntl error: %s\n",strerror(errno));
              exit(1);
            }
        }
      if (s[1] != 3)
        close(s[1]);
      if (execvp(args1[0],args1) < 0)
        {
          fprintf(stderr,"execvp error: %s\n",strerror(errno));
          exit(1);
        }
      break;
    }
}
  

  
1	slords	1.1	#include <sys/types.h>
2			#include <sys/socket.h>
3			#include <stdio.h>
4			#include <errno.h>
5			#include <stdlib.h>
6			#include <fcntl.h>
7			#include <strings.h>
8
9			int main(int argc, char *argv[])
10			{
11			int s[2];
12			char args1, args2;
13			int firstarg, lastarg;
14			int i;
15
16			if (socketpair(PF_UNIX, SOCK_STREAM, 0, s) < 0)
17			{
18			fprintf(stderr,"socketpair failed: %s\n",strerror(errno));
19			exit(1);
20			}
21
22			/* Make this configurable later, but for now it's fine. */
23
24			/* Find the first program to execute. */
25			firstarg = 1;
26			for(i=1;i<argc;i++)
27			{
28			if (strcmp(argv[i],"-makesock_connect_to")==0)
29			{
30			break;
31			}
32			}
33			lastarg = i;
34			if ( (args1=malloc((lastarg-firstarg+1) * sizeof(char *))) == NULL)
35			{
36			fprintf(stderr,"malloc error: %s\n",strerror(errno));
37			exit(1);
38			}
39			for (i=0;i<(lastarg-firstarg);i++)
40			{
41			args1[i]=argv[firstarg+i];
42			}
43			args1[i] = NULL;
44
45			lastarg++;
46
47			/* Now find the last program to execute. */
48			if ( (args2=malloc((argc-lastarg+1) * sizeof(char *))) == NULL)
49			{
50			fprintf(stderr,"malloc error: %s\n",strerror(errno));
51			exit(1);
52			}
53			for(i=0;i<(argc-lastarg);i++)
54			{
55			args2[i] = argv[lastarg+i];
56			}
57			args2[i] = NULL;
58
59			switch(fork())
60			{
61			case -1:
62			/* Error. */
63			exit(1);
64			case 0:
65			/* Child */
66			close(s[0]);
67			close(0);
68			close(1);
69			if (dup2(s[1],0) < 0)
70			{
71			fprintf(stderr,"dup2 error: %s\n",strerror(errno));
72			exit(1);
73			}
74			if (dup2(s[1],1) < 0)
75			{
76			fprintf(stderr,"dup2 error: %s\n",strerror(errno));
77			exit(1);
78			}
79			if (execvp(args2[0],args2) < 0)
80			{
81			fprintf(stderr,"execvp error: %s\n",strerror(errno));
82			exit(1);
83			}
84			break;
85			default:
86			/* Parent */
87			if (s[0] != 3)
88			{
89			close(3);
90			if (dup2(s[0],3) < 0)
91			{
92			fprintf(stderr,"dup2 error: %s\n",strerror(errno));
93			exit(1);
94			}
95			if (fcntl(3,F_SETFD,0) == -1) /* Turn off close-on-exec */
96			{
97			fprintf(stderr,"fcntl error: %s\n",strerror(errno));
98			exit(1);
99			}
100			}
101			if (s[1] != 3)
102			close(s[1]);
103			if (execvp(args1[0],args1) < 0)
104			{
105			fprintf(stderr,"execvp error: %s\n",strerror(errno));
106			exit(1);
107			}
108			break;
109			}
110			}
111
112
113