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/*
* Copyright (C) 2007 OpenedHand, Ltd.
* Contact: <andrew@o-hand.com>
*
* This file is licensed under the terms of GNU GPL v2.
*
* $ pty [<hostname|ip> <port>]
* Opens a new pseudo terminal and forwards data between standard input
* and the pty and between the pty and standard output. If a hostname and
* port number are given, reads and writes to the socket instead of
* standard input or output. Path to the slave pty is printed on standard
* error.
*/
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <poll.h>
#define CHECK(val, name) \
if (val == -1) { \
fprintf(stderr, #name ": %s (%i)\n", strerror(errno), errno);\
return -errno; \
}
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
static int forward2(int in0, int out0, int in1, int out1,
int (*closed)(int fd)) {
int inpos = 0, inlen = 0, outpos = 0, outlen = 0, ret, n;
fd_set rfds, wfds;
char in[0x100], out[0x100];
n = max(max(in0, in1), max(out0, out1)) + 1;
while (1) {
FD_ZERO(&rfds);
FD_ZERO(&wfds);
if (inlen < sizeof(in))
FD_SET(in0, &rfds);
if (outlen < sizeof(out))
FD_SET(in1, &rfds);
if (inlen)
FD_SET(out0, &wfds);
if (outlen)
FD_SET(out1, &wfds);
CHECK(select(n, &rfds, &wfds, 0, 0), select);
if (FD_ISSET(in0, &rfds)) {
ret = (inpos + inlen) & (sizeof(in) - 1);
ret = read(in0, in + ret,
sizeof(in) - max(ret, inlen));
CHECK(ret, read(0));
if (!ret)
return 0;
inlen += ret;
}
if (FD_ISSET(in1, &rfds)) {
ret = (outpos + outlen) & (sizeof(out) - 1);
ret = read(in1, out + ret,
sizeof(out) - max(ret, outlen));
if (ret > 0)
outlen += ret;
if (ret < 0 && errno == EIO && closed) {
in1 = out0 = closed(in1);
if (in1 < 0)
return in1;
n = max(max(in0, in1), max(out0, out1)) + 1;
continue;
}
}
if (FD_ISSET(out0, &wfds)) {
ret = write(out0, in + inpos,
min(sizeof(in) - inpos, inlen));
CHECK(ret, write(pty));
inlen -= ret;
inpos += ret;
inpos &= sizeof(in) - 1;
}
if (FD_ISSET(out1, &wfds)) {
ret = write(out1, out + outpos,
min(sizeof(out) - outpos, outlen));
CHECK(ret, write(1));
outlen -= ret;
outpos += ret;
outpos &= sizeof(out) - 1;
}
}
return pause();
}
static int reopen(int fd) {
const char *name = ttyname(fd);
CHECK(close(fd), close(pty));
fd = open(name, O_RDWR | O_NOCTTY);
CHECK(fd, open);
CHECK(grantpt(fd), grantpt);
CHECK(unlockpt(fd), unlockpt);
fprintf(stderr, "%s\n", ptsname(fd));
return fd;
}
int main(int argc, char *argv[], char **envp) {
int sock, fd;
struct sockaddr_in sa;
struct hostent *hi;
fd = posix_openpt(O_RDWR | O_NOCTTY);
CHECK(fd, open);
CHECK(grantpt(fd), grantpt);
CHECK(unlockpt(fd), unlockpt);
fprintf(stderr, "%s\n", ptsname(fd));
#if 0
/* Connect stdin & stdout with a pty */
CHECK(close(0), close(0));
CHECK(close(1), close(1));
CHECK(dup(fd), dup(0));
CHECK(dup(fd), dup(1));
return pause();
#endif
if (argc != 3)
return forward2(0, fd, fd, 1, reopen);
#if 0
/* Connect a sub-process with a pty */
for (len = 0, i = 1; i < argc; i ++)
len += strlen(argv[i]) + 4;
param = malloc(len);
strcpy(param, argv[1]);
for (i = 2; i < argc; i ++)
sprintf(param + strlen(param), " \"%s\"", argv[i]);
i = fileno(popen(param, O_RDWR));
CHECK(i, popen);
free(param);
return forward2(i, fd, fd, i, reopen);
#endif
/* Connect a TCP socket with a pty */
hi = gethostbyname(argv[1]);
if (!hi) {
errno = h_errno;
CHECK(-1, gethostbyname);
}
sa.sin_family = hi->h_addrtype;
memcpy(&sa.sin_addr.s_addr, hi->h_addr_list[0], hi->h_length);
sa.sin_port = htons(strtol(argv[2], 0, 0));
sock = socket(AF_INET, SOCK_STREAM, 0);
CHECK(sock, socket);
CHECK(connect(sock, (struct sockaddr *) &sa, sizeof(sa)), connect);
return forward2(sock, fd, fd, sock, reopen);
}
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