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#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <unistd.h>
extern void setup_env(int, const char*);
#ifndef SUN_LEN
/* Evaluate to actual length of the `sockaddr_un' structure. */
#define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
+ strlen ((ptr)->sun_path))
#endif
static const char* argv0;
static const char* opt_socket;
static char** command_argv;
void die(const char* msg)
{
perror(msg);
exit(1);
}
int do_connect(void)
{
size_t size;
struct sockaddr_un* saddr;
int s = socket(AF_UNIX, SOCK_STREAM, 0);
if(s == -1)
die("socket");
size = sizeof(struct sockaddr_un) + strlen(opt_socket)+1;
saddr = (struct sockaddr_un*)malloc(size);
saddr->sun_family = AF_UNIX;
strcpy(saddr->sun_path, opt_socket);
if(connect(s, (struct sockaddr*)saddr, SUN_LEN(saddr)) == -1)
die("connect");
free(saddr);
return s;
}
void usage(const char* message)
{
if(message)
fprintf(stderr, "%s: %s\n", argv0, message);
fprintf(stderr, "usage: %s [options] socket program\n"
" -q Quiet. Do not print any messages.\n"
" -Q (default) Print error messages.\n"
" -v Verbose. Print error and status messages.\n"
" -c N Do not handle more than N simultaneous connections.\n"
" (default 10)\n", argv0);
exit(1);
}
void parse_options(int argc, char* argv[])
{
argv0 = argv[0];
++argv;
--argc;
if(argc < 2)
usage(0);
opt_socket = argv[0];
command_argv = argv + 1;
}
void exec_program(int fd)
{
setup_env(fd, opt_socket);
if(dup2(fd, 6) == -1 || dup2(fd, 7) == -1)
die("dup2");
if(fd != 6 && fd != 7) close(fd);
execvp(command_argv[0], command_argv);
die("execvp");
}
int main(int argc, char* argv[])
{
int fd;
parse_options(argc, argv);
fd = do_connect();
exec_program(fd);
return 1;
}
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