291 lines
6.8 KiB
C
291 lines
6.8 KiB
C
/* rget 2.6 - remote pipe Author: Kees J. Bot
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* 20 Mar 1989
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*
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* here$ ... | rput key there$ rget -h here key | ...
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* here$ rput key command ... there$ rget -h here key command ...
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*
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* (Once my first try at network programming, completely reworked by now.)
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*/
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#define nil ((void*)0)
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#if __minix
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#include <net/gen/in.h>
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#include <net/gen/inet.h>
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#include <net/gen/netdb.h>
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#include <net/gen/socket.h>
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#include <net/gen/tcp.h>
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#include <net/gen/tcp_hdr.h>
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#include <net/gen/tcp_io.h>
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#include <net/hton.h>
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#include <net/netlib.h>
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#else
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#endif
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static char *name;
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static int iflag, oflag, hflag, lflag, cflag; /* -iolch? */
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static char *host; /* Argument to -h. */
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static struct hostent *hent; /* gethostbyname(host) */
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static char *key; /* key (port) */
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static char **cmdv; /* command [arg ...] */
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static void fatal(const char *label)
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{
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int err= errno;
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fprintf(stderr, "%s: %s: %s\n", name, label, strerror(err));
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exit(1);
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}
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static unsigned name2port(char *n)
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{
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char *end;
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unsigned port;
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port= strtoul(n, &end, 0);
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if (end == n || *end != 0) {
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port= 1;
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while (*n != 0) port *= (*n++ & 0xFF);
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port |= 0x8000;
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}
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return htons(port & 0xFFFF);
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}
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: %s [-lcio] [-h host] key [command [arg ...]]\n"
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"\t-l: Open TCP socket and listen (default for rput)\n"
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"\t-c: Connect to a remote TCP socket (default for rget)\n"
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"\t-i: Tie standard input to the TCP stream (default for rget)\n"
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"\t-o: Tie standard output to the TCP stream (default for rput)\n"
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"\t-io: Bidirectional!\n"
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"\tkey: A word to hash into a port number, or simply a port number\n",
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name);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int i, s;
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if ((name= strrchr(argv[0], '/')) == nil) name= argv[0]; else name++;
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if (strcmp(name, "rget") != 0 && strcmp(name, "rput") != 0) {
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fprintf(stderr, "Don't know what to do if you call me '%s'\n", name);
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exit(1);
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}
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i= 1;
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while (i < argc && argv[i][0] == '-') {
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char *opt= argv[i++]+1;
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if (opt[0] == '-' && opt[1] == 0) break; /* -- */
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while (*opt != 0) switch (*opt++) {
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case 'l': lflag= 1; break;
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case 'c': cflag= 1; break;
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case 'i': iflag= 1; break;
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case 'o': oflag= 1; break;
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case 'h':
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hflag= 1;
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if (*opt == 0) {
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if (i == argc) usage();
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opt= argv[i++];
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}
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host= opt;
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opt= "";
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break;
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default: usage(); break;
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}
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}
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if (i == argc) usage();
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key= argv[i++];
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cmdv= argv + i;
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/* Defaults. */
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if (!lflag && !cflag) {
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if (name[1] == 'p') lflag= 1;
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if (name[1] == 'g') cflag= 1;
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}
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if (!iflag && !oflag) {
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if (name[1] == 'g') iflag= 1;
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if (name[1] == 'p') oflag= 1;
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}
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/* Constraints. */
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if (lflag && cflag) {
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fprintf(stderr, "%s: -c and -l don't mix\n", name);
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usage();
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}
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if (cflag && !hflag) {
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fprintf(stderr, "%s: -c requires a host name given with -h\n", name);
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usage();
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}
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if (lflag && hflag) {
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fprintf(stderr, "%s: -l does not require a host name given with -h\n",
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name);
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usage();
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}
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if (iflag && oflag && cmdv[0] == nil) {
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fprintf(stderr, "%s: -io requires that a command is given\n", name);
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usage();
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}
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if (hflag) {
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if ((hent= gethostbyname(host)) == nil) {
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fprintf(stderr, "%s: %s: Name lookup failed\n", name, host);
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exit(1);
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}
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}
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s= -1;
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if (lflag) {
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/* We need to listen and wait. (We're "rput", most likely.) */
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#if __minix
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char *tcp_device;
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struct nwio_tcpconf tcpconf;
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struct nwio_tcpcl tcplistenopt;
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if ((tcp_device= getenv("TCP_DEVICE")) == nil) tcp_device= "/dev/tcp";
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if ((s= open(tcp_device, O_RDWR)) < 0) fatal(tcp_device);
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tcpconf.nwtc_flags=
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NWTC_EXCL | NWTC_LP_SET | NWTC_UNSET_RA | NWTC_UNSET_RP;
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tcpconf.nwtc_locport= name2port(key);
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if (ioctl(s, NWIOSTCPCONF, &tcpconf) < 0) fatal("NWIOSTCPCONF");
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tcplistenopt.nwtcl_flags= 0;
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if (ioctl(s, NWIOTCPLISTEN, &tcplistenopt) < 0) fatal("NWIOTCPLISTEN");
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#else
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int sa;
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struct sockaddr_in channel;
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static int on= 1;
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if ((s= socket(AF_INET, SOCK_STREAM, IPPROTO_TCP))<0) fatal("socket()");
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(void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &on,
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sizeof(on));
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memset(&channel, 0, sizeof(channel));
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channel.sin_family= AF_INET;
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channel.sin_addr.s_addr= htonl(INADDR_ANY);
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channel.sin_port= name2port(key);
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if (bind(s, (struct sockaddr *) &channel, sizeof(channel)) < 0)
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fatal("bind()");
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if (listen(s, 0) < 0) fatal("listen()");
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if ((sa= accept(s, nil, nil)) < 0) fatal("accept()");
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close(s);
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s= sa;
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#endif
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}
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if (cflag) {
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/* Connect to the remote end. (We're "rget", most likely.) */
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#if __minix
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int n;
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char *tcp_device;
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nwio_tcpconf_t tcpconf;
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nwio_tcpcl_t tcpconnopt;
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if ((tcp_device= getenv("TCP_DEVICE")) == nil) tcp_device= "/dev/tcp";
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n=60;
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for (;;) {
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if ((s= open(tcp_device, O_RDWR)) < 0) fatal(tcp_device);
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tcpconf.nwtc_flags= NWTC_LP_SEL | NWTC_SET_RA | NWTC_SET_RP;
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memcpy(&tcpconf.nwtc_remaddr, hent->h_addr,
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sizeof(tcpconf.nwtc_remaddr));
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tcpconf.nwtc_remport= name2port(key);
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if (ioctl(s, NWIOSTCPCONF, &tcpconf) < 0) fatal("NWIOSTCPCONF");
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tcpconnopt.nwtcl_flags= 0;
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if (ioctl(s, NWIOTCPCONN, &tcpconnopt) == 0) break;
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if (--n > 0) sleep(2); else fatal("NWIOTCPCONN");
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close(s);
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}
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#else
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int n;
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struct sockaddr_in channel;
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n=60;
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for (;;) {
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if ((s= socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
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fatal("socket()");
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memset(&channel, 0, sizeof(channel));
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channel.sin_family= AF_INET;
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memcpy(&channel.sin_addr.s_addr, hent->h_addr,
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sizeof(channel.sin_addr.s_addr));
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channel.sin_port= name2port(key);
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if (connect(s, (struct sockaddr *) &channel,
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sizeof(channel)) >= 0) break;
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if (--n > 0) sleep(2); else fatal("connect()");
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close(s);
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}
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#endif
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}
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if (cmdv[0] != nil) {
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/* A command is given, so execute it with standard input (rget),
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* standard output (rput) or both (-io) tied to the TCP stream.
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*/
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if (iflag) dup2(s, 0);
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if (oflag) dup2(s, 1);
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close(s);
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execvp(cmdv[0], cmdv);
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fatal(cmdv[0]);
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} else {
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/* Without a command we have to copy bytes ourselves, probably to or
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* from a command that is connected to us with a pipe. (The original
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* function of rput/rget, a remote pipe.)
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*/
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int fi, fo;
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int n;
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char buf[8192];
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if (iflag) {
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fi= s;
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fo= 1;
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} else {
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fi= 0;
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fo= s;
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}
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while ((n= read(fi, buf, sizeof(buf))) > 0) {
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char *bp= buf;
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while (n > 0) {
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int r;
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if ((r= write(fo, bp, n)) <= 0) {
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if (r == 0) {
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fprintf(stderr, "%s: write(): Unexpected EOF\n", name);
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exit(1);
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}
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fatal("write()");
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}
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bp+= r;
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n-= r;
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}
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}
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if (n < 0) fatal("read()");
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}
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return 0;
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}
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