/* portbind.c: Tim Hollebeek, Oct 28, 1996 */
#include "std.h"
#include "network_incl.h"
#define HANDLE_ERROR(routine, call) if ((call) == -1) { perror(#routine); exit(-1); }
int main(int argc, char **argv) {
#ifndef WIN32
int port = -1;
char *ipaddress = 0;
char *driver_name = "./driver";
int uid = -1;
int gid = -1;
int fd;
int optval = 1;
struct sockaddr_in sin;
/*Args are passed down to the driver, but we process the following options:
*
* -p <port number>
* -d <driver path>
* -u <uid>
* -g <gid>
* -i <ip address>
*
* anything else causes us to quit scanning options.
*/
while (argc > 1) {
if (strcmp(argv[1], "-p") == 0) {
if (argc == 2 || sscanf(argv[2], "%d", &port) != 1) {
fprintf(stderr, "%s: -p must be followed by a port number.\n",
argv[0]);
exit(-1);
}
argc -= 2;
argv += 2;
} else if (strcmp(argv[1], "-d") == 0) {
if (argc == 2) {
fprintf(stderr, "%s: -d must be followed by the driver pathname.\n", argv[0]);
exit(-1);
}
driver_name = argv[2];
argc -= 2;
argv += 2;
} else if (strcmp(argv[1], "-u") == 0) {
if (argc == 2 || sscanf(argv[2], "%d", &uid) != 1) {
fprintf(stderr, "%s: -u must be followed by a valid numeric uid.\n", argv[0]);
exit(-1);
}
argc -= 2;
argv += 2;
} else if (strcmp(argv[1], "-g") == 0) {
if (argc == 2 || sscanf(argv[2], "%d", &gid) != 1) {
fprintf(stderr, "%s: -g must be followed by a valid numeric gid.\n", argv[0]);
exit(-1);
}
argc -= 2;
argv += 2;
} else if (strcmp(argv[1], "-i") == 0) {
if (argc == 2 || inet_addr(argv[2]) == INADDR_NONE) {
fprintf(stderr, "%s: -i must be followed by a valid dotted decimal ip address.\n", argv[0]);
exit(-1);
}
ipaddress = argv[2];
argc -= 2;
argv += 2;
} else break;
}
if (port == -1) {
fprintf(stderr, "%s: a port must be specified with -p.\n", argv[0]);
exit(-1);
}
/* create the socket */
HANDLE_ERROR(socket, fd = socket(AF_INET, SOCK_STREAM, 0));
/* move to fd #6 */
HANDLE_ERROR(dup2, dup2(fd, 6));
/* close the old copy */
HANDLE_ERROR(close, close(fd));
/* set local address reuse */
HANDLE_ERROR(setsockopt, setsockopt(6, SOL_SOCKET, SO_REUSEADDR, (char *)&optval, sizeof(optval)) == -1);
/* setup our address */
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = (ipaddress ? inet_addr(ipaddress) : INADDR_ANY);
sin.sin_port = htons((unsigned short)port);
/* bind to our address */
HANDLE_ERROR(bind, bind(6, (struct sockaddr *)&sin, sizeof(sin)));
/* change our uid and gid */
if (gid != -1)
HANDLE_ERROR(setgid, setgid(gid));
if (uid != -1)
HANDLE_ERROR(setuid, setuid(uid));
argv[0] = driver_name;
/* exec the driver */
HANDLE_ERROR(execv, execv(driver_name, argv));
#endif
return 0;
}