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