minix/commands/simple/rget.c
2005-04-21 14:53:53 +00:00

290 lines
6.8 KiB
C
Executable file

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