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/*
* uxproxy.c: Unix implementation of platform_new_connection(),
* supporting an OpenSSH-like proxy command.
*/
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include "tree234.h"
#include "putty.h"
#include "network.h"
#include "proxy.h"
Socket *platform_new_connection(SockAddr *addr, const char *hostname,
int port, bool privport,
bool oobinline, bool nodelay, bool keepalive,
Plug *plug, Conf *conf)
{
char *cmd;
int to_cmd_pipe[2], from_cmd_pipe[2], cmd_err_pipe[2], pid, proxytype;
int infd, outfd, inerrfd;
proxytype = conf_get_int(conf, CONF_proxy_type);
if (proxytype != PROXY_CMD && proxytype != PROXY_FUZZ)
return NULL;
if (proxytype == PROXY_CMD) {
cmd = format_telnet_command(addr, port, conf);
{
char *logmsg = dupprintf("Starting local proxy command: %s", cmd);
plug_log(plug, PLUGLOG_PROXY_MSG, NULL, 0, logmsg, 0);
sfree(logmsg);
}
/*
* Create the pipes to the proxy command, and spawn the proxy
* command process.
*/
if (pipe(to_cmd_pipe) < 0 ||
pipe(from_cmd_pipe) < 0 ||
pipe(cmd_err_pipe) < 0) {
sfree(cmd);
return new_error_socket_fmt(plug, "pipe: %s", strerror(errno));
}
cloexec(to_cmd_pipe[1]);
cloexec(from_cmd_pipe[0]);
cloexec(cmd_err_pipe[0]);
pid = fork();
if (pid == 0) {
close(0);
close(1);
dup2(to_cmd_pipe[0], 0);
dup2(from_cmd_pipe[1], 1);
close(to_cmd_pipe[0]);
close(from_cmd_pipe[1]);
dup2(cmd_err_pipe[1], 2);
noncloexec(0);
noncloexec(1);
execl("/bin/sh", "sh", "-c", cmd, (void *)NULL);
_exit(255);
}
sfree(cmd);
if (pid < 0)
return new_error_socket_fmt(plug, "fork: %s", strerror(errno));
close(to_cmd_pipe[0]);
close(from_cmd_pipe[1]);
close(cmd_err_pipe[1]);
outfd = to_cmd_pipe[1];
infd = from_cmd_pipe[0];
inerrfd = cmd_err_pipe[0];
} else {
cmd = format_telnet_command(addr, port, conf);
outfd = open("/dev/null", O_WRONLY);
if (outfd == -1) {
sfree(cmd);
return new_error_socket_fmt(
plug, "/dev/null: %s", strerror(errno));
}
infd = open(cmd, O_RDONLY);
if (infd == -1) {
Socket *toret = new_error_socket_fmt(
plug, "%s: %s", cmd, strerror(errno));
sfree(cmd);
close(outfd);
return toret;
}
sfree(cmd);
inerrfd = -1;
}
/* We are responsible for this and don't need it any more */
sk_addr_free(addr);
return make_fd_socket(infd, outfd, inerrfd, plug);
}
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