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/*
* telnetd.c - glue to tie telnet.c from ttywatch to the loader
*
* Erik Troan <ewt@redhat.com>
* Jeremy Katz <katzj@redhat.com>
*
* Copyright 2002 Red Hat, Inc.
*
* This software may be freely redistributed under the terms of the GNU
* General Public License.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <newt.h>
#include <pty.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/signal.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "lang.h"
#include "loader.h"
#include "log.h"
#include "modules.h"
#include "net.h"
#include "telnet.h"
#include "windows.h"
#ifndef IPPORT_TELNET
#define IPPORT_TELNET 23
#endif
/* boot flags */
extern int flags;
/* Forks, keeping the loader as our child (so we know when it dies). */
int beTelnet(void) {
int sock;
int conn;
socklen_t addrLength;
pid_t child;
int i;
int masterFd, ttyFd;
struct sockaddr_in address;
char buf[4096];
struct pollfd fds[3];
telnet_state ts = TS_DATA;
char * termType;
int height, width;
struct winsize ws;
if ((sock = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
logMessage(ERROR, "socket: %s", strerror(errno));
return -1;
}
address.sin_family = AF_INET;
address.sin_port = htons(IPPORT_TELNET);
memset(&address.sin_addr, 0, sizeof(address.sin_addr));
addrLength = sizeof(address);
/* Let the kernel reuse the socket address. This lets us run
twice in a row, without waiting for the (ip, port) tuple
to time out. Makes testing much easier*/
conn = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &conn, sizeof(conn));
bind(sock, (struct sockaddr *) &address, sizeof(address));
listen(sock, 5);
winStatus(45, 3, _("Telnet"), _("Waiting for telnet connection..."));
if ((conn = accept(sock, (struct sockaddr *) &address,
&addrLength)) < 0) {
newtWinMessage(_("Error"), _("OK"), "accept failed: %s",
strerror(errno));
close(sock);
return -1;
}
stopNewt();
close(sock);
telnet_negotiate(conn, &termType, &height, &width);
#ifdef DEBUG_TELNET
printf("got term type %s\n", termType);
#endif
masterFd = open("/dev/ptmx", O_RDWR);
if (masterFd < 0) {
logMessage(CRITICAL, "cannot open /dev/ptmx");
close(conn);
return -1;
}
if (height != -1 && width != -1) {
#ifdef DEBUG_TELNET
printf("setting window size to %d x %d\n", width, height);
#endif
ws.ws_row = height;
ws.ws_col = width;
ioctl(masterFd, TIOCSWINSZ, &ws);
}
child = fork();
if (child) {
#ifndef DEBUG_TELNET
startNewt();
winStatus(45, 3, _("Telnet"), _("Running anaconda via telnet..."));
#endif
fds[0].events = POLLIN;
fds[0].fd = masterFd;
fds[1].events = POLLIN;
fds[1].fd = conn;
while ((i = poll(fds, 2, -1)) > 0) {
if (fds[0].revents) {
i = read(masterFd, buf, sizeof(buf));
#ifdef DEBUG_TELNET
{
int j;
int row;
for (row = 0; row < (i / 12) + 1; row++) {
printf("wrote:");
for (j = (row * 12); j < i && j < ((row + 1) * 12); j++)
printf(" 0x%2x", (unsigned char) buf[j]);
printf("\n");
printf("wrote:");
for (j = (row * 12); j < i && j < ((row + 1) * 12); j++)
{
if (isprint(buf[j]))
printf(" %c ", buf[j]);
else
printf(" ");
}
printf("\n");
}
}
#endif
/* child died */
if (i < 0)
break;
telnet_send_output(conn, buf, i);
}
if (fds[1].revents) {
int ret;
i = read(conn, buf, sizeof(buf));
/* connection went away */
if (!i)
break;
i = telnet_process_input(&ts, buf, i);
ret = write(masterFd, buf, i);
#ifdef DEBUG_TELNET
{
int j;
printf("got:");
for (j = 0; j < i; j++)
printf(" 0x%x", (unsigned char) buf[j]);
printf("\n");
}
#endif
}
}
if (i < 0) {
logMessage(ERROR, "poll: %s", strerror(errno));
}
#ifndef DEBUG_TELNET
stopNewt();
#endif
kill(child, SIGTERM);
close(conn);
exit(0);
}
unlockpt(masterFd);
grantpt(masterFd);
ttyFd = open(ptsname(masterFd), O_RDWR);
close(masterFd);
setsid();
close(0);
close(1);
close(2);
if (ttyFd != 0) {
dup2(ttyFd, 0);
close(ttyFd);
}
dup2(0, 1);
dup2(0, 2);
/* brand new tty! */
setenv("TERM", termType, 1);
startNewt();
return 0;
}
void startTelnetd(struct loaderData_s * loaderData,
moduleInfoSet modInfo, moduleList modLoaded,
moduleDeps modDeps) {
char ret[47];
struct networkDeviceConfig netCfg;
ip_addr_t *tip;
if (kickstartNetworkUp(loaderData, &netCfg)) {
logMessage(ERROR, "unable to bring up network");
return;
}
tip = &(netCfg.dev.ip);
inet_ntop(tip->sa_family, IP_ADDR(tip), ret, IP_STRLEN(tip));
logMessage(INFO, "going to beTelnet for %s", ret);
if (!beTelnet())
flags |= LOADER_FLAGS_TEXT | LOADER_FLAGS_NOSHELL;
return;
}
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