256 lines
6.3 KiB
C
256 lines
6.3 KiB
C
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/*
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* telnetd.c - glue to tie telnet.c from ttywatch to the loader
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*
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* Copyright (C) 2002 Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author(s): Erik Troan <ewt@redhat.com>
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* Jeremy Katz <katzj@redhat.com>
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*/
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netinet/in.h>
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#include <newt.h>
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#include <pty.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/signal.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "lang.h"
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#include "loader.h"
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#include "log.h"
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#include "modules.h"
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#include "net.h"
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#include "telnet.h"
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#include "windows.h"
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#ifndef IPPORT_TELNET
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#define IPPORT_TELNET 23
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#endif
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/* boot flags */
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extern uint64_t flags;
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/* Forks, keeping the loader as our child (so we know when it dies). */
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int beTelnet(void) {
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int sock;
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int conn;
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socklen_t addrLength;
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pid_t child;
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int i;
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int masterFd, ttyFd;
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struct sockaddr_in address;
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char buf[4096];
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struct pollfd fds[3];
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telnet_state ts = TS_DATA;
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char * termType;
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int height, width;
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struct winsize ws;
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if ((sock = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
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logMessage(ERROR, "socket: %s", strerror(errno));
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return -1;
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}
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address.sin_family = AF_INET;
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address.sin_port = htons(IPPORT_TELNET);
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memset(&address.sin_addr, 0, sizeof(address.sin_addr));
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addrLength = sizeof(address);
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/* Let the kernel reuse the socket address. This lets us run
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twice in a row, without waiting for the (ip, port) tuple
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to time out. Makes testing much easier*/
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conn = 1;
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setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &conn, sizeof(conn));
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bind(sock, (struct sockaddr *) &address, sizeof(address));
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listen(sock, 5);
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winStatus(45, 3, _("Telnet"), _("Waiting for telnet connection."));
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if ((conn = accept(sock, (struct sockaddr *) &address, &addrLength)) < 0) {
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newtWinMessage(_("Error"), _("OK"), "accept failed: %s",
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strerror(errno));
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close(sock);
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return -1;
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}
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stopNewt();
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close(sock);
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telnet_negotiate(conn, &termType, &height, &width);
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#ifdef DEBUG_TELNET
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printf("got term type %s\n", termType);
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#endif
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masterFd = open("/dev/ptmx", O_RDWR);
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if (masterFd < 0) {
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logMessage(CRITICAL, "cannot open /dev/ptmx");
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close(conn);
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return -1;
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}
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if (height != -1 && width != -1) {
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#ifdef DEBUG_TELNET
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printf("setting window size to %d x %d\n", width, height);
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#endif
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ws.ws_row = height;
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ws.ws_col = width;
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ioctl(masterFd, TIOCSWINSZ, &ws);
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}
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child = fork();
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if (child) {
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#ifndef DEBUG_TELNET
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startNewt();
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winStatus(45, 3, _("Telnet"), _("Running anaconda via telnet."));
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#endif
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fds[0].events = POLLIN;
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fds[0].fd = masterFd;
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fds[1].events = POLLIN;
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fds[1].fd = conn;
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while ((i = poll(fds, 2, -1)) > 0) {
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if (fds[0].revents) {
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i = read(masterFd, buf, sizeof(buf));
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#ifdef DEBUG_TELNET
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{
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int j;
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int row;
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for (row = 0; row < (i / 12) + 1; row++) {
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printf("wrote:");
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for (j = (row * 12); j < i && j < ((row + 1) * 12); j++)
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printf(" 0x%2x", (unsigned char) buf[j]);
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printf("\nwrote:");
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for (j = (row*12); j < i && j < ((row+1)*12); j++) {
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if (isprint(buf[j]))
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printf(" %c ", buf[j]);
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else
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printf(" ");
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}
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printf("\n");
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}
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}
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#endif
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/* child died */
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if (i < 0)
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break;
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telnet_send_output(conn, buf, i);
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}
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if (fds[1].revents) {
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int ret;
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i = read(conn, buf, sizeof(buf));
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/* connection went away */
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if (!i)
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break;
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i = telnet_process_input(&ts, buf, i);
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ret = write(masterFd, buf, i);
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#ifdef DEBUG_TELNET
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{
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int j;
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printf("got:");
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for (j = 0; j < i; j++)
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printf(" 0x%x", (unsigned char) buf[j]);
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printf("\n");
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}
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#endif
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}
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}
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if (i < 0) {
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logMessage(ERROR, "poll: %s", strerror(errno));
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}
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#ifndef DEBUG_TELNET
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stopNewt();
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#endif
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kill(child, SIGTERM);
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close(conn);
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doExit(0);
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}
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unlockpt(masterFd);
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grantpt(masterFd);
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ttyFd = open(ptsname(masterFd), O_RDWR);
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close(masterFd);
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setsid();
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close(0);
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close(1);
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close(2);
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if (ttyFd != 0) {
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dup2(ttyFd, 0);
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close(ttyFd);
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}
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dup2(0, 1);
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dup2(0, 2);
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/* brand new tty! */
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setenv("TERM", termType, 1);
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startNewt();
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return 0;
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}
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void startTelnetd(struct loaderData_s * loaderData) {
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char *ipaddr = NULL;
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iface_t iface;
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iface_init_iface_t(&iface);
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if (kickstartNetworkUp(loaderData, &iface)) {
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logMessage(ERROR, "unable to bring up network");
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return;
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}
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ipaddr = iface_ip2str(iface.device, AF_INET);
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if (ipaddr == NULL) {
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logMessage(ERROR, "%s (%d): no IP address found for %s",
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__func__, __LINE__, iface.device);
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return;
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}
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logMessage(INFO, "going to beTelnet for %s", ipaddr);
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if (!beTelnet())
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flags |= LOADER_FLAGS_TEXT | LOADER_FLAGS_NOSHELL;
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return;
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}
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