327 lines
6.9 KiB
C
327 lines
6.9 KiB
C
/* Serial interface for raw TCP connections on Un*x like systems
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Copyright 1992, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "serial.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include "signals.h"
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struct tcp_ttystate
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{
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int bogus;
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};
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static int tcp_open PARAMS ((serial_t scb, const char *name));
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static void tcp_raw PARAMS ((serial_t scb));
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static int wait_for PARAMS ((serial_t scb, int timeout));
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static int tcp_readchar PARAMS ((serial_t scb, int timeout));
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static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
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static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
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static void tcp_restore PARAMS ((serial_t scb));
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static void tcp_close PARAMS ((serial_t scb));
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static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
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static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
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/* Open up a raw tcp socket */
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static int
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tcp_open(scb, name)
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serial_t scb;
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const char *name;
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{
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char *port_str;
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int port;
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struct hostent *hostent;
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struct sockaddr_in sockaddr;
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int tmp;
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char hostname[100];
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struct protoent *protoent;
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port_str = strchr (name, ':');
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if (!port_str)
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error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
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tmp = min (port_str - name, sizeof hostname - 1);
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strncpy (hostname, name, tmp); /* Don't want colon */
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hostname[tmp] = '\000'; /* Tie off host name */
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port = atoi (port_str + 1);
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hostent = gethostbyname (hostname);
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if (!hostent)
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{
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fprintf (stderr, "%s: unknown host\n", hostname);
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errno = ENOENT;
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return -1;
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}
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scb->fd = socket (PF_INET, SOCK_STREAM, 0);
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if (scb->fd < 0)
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return -1;
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/* Allow rapid reuse of this port. */
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tmp = 1;
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setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp));
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/* Enable TCP keep alive process. */
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tmp = 1;
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setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));
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sockaddr.sin_family = PF_INET;
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sockaddr.sin_port = htons(port);
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memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
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sizeof (struct in_addr));
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if (connect (scb->fd, &sockaddr, sizeof(sockaddr)))
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{
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close(scb->fd);
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scb->fd = -1;
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return -1;
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}
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protoent = getprotobyname ("tcp");
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if (!protoent)
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return -1;
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tmp = 1;
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if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
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(char *)&tmp, sizeof(tmp)))
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return -1;
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signal(SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits
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when the remote side dies. */
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return 0;
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}
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static serial_ttystate
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tcp_get_tty_state(scb)
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serial_t scb;
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{
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struct tcp_ttystate *state;
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state = (struct tcp_ttystate *)xmalloc(sizeof *state);
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return (serial_ttystate)state;
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}
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static int
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tcp_set_tty_state(scb, ttystate)
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serial_t scb;
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serial_ttystate ttystate;
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{
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struct tcp_ttystate *state;
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state = (struct tcp_ttystate *)ttystate;
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return 0;
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}
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static int
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tcp_flush_output (scb)
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serial_t scb;
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{
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/* This is only used by utils.c on stdout, so it doesn't need to work
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for tcp. */
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return 0;
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}
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static void
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tcp_raw(scb)
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serial_t scb;
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{
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return; /* Always in raw mode */
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}
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/* Wait for input on scb, with timeout seconds. Returns 0 on success,
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otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
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For termio{s}, we actually just setup VTIME if necessary, and let the
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timeout occur in the read() in tcp_read().
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*/
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static int
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wait_for(scb, timeout)
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serial_t scb;
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int timeout;
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{
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int numfds;
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struct timeval tv;
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fd_set readfds, exceptfds;
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FD_ZERO (&readfds);
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FD_ZERO (&exceptfds);
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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FD_SET(scb->fd, &readfds);
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FD_SET(scb->fd, &exceptfds);
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while (1)
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{
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if (timeout >= 0)
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numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv);
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else
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numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0);
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if (numfds <= 0)
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if (numfds == 0)
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return SERIAL_TIMEOUT;
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else if (errno == EINTR)
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continue;
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else
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return SERIAL_ERROR; /* Got an error from select or poll */
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return 0;
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}
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}
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/* Read a character with user-specified timeout. TIMEOUT is number of seconds
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to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
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char if successful. Returns -2 if timeout expired, EOF if line dropped
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dead, or -3 for any other error (see errno in that case). */
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static int
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tcp_readchar(scb, timeout)
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serial_t scb;
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int timeout;
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{
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int status;
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if (scb->bufcnt-- > 0)
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return *scb->bufp++;
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status = wait_for(scb, timeout);
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if (status < 0)
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return status;
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scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
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if (scb->bufcnt <= 0)
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if (scb->bufcnt == 0)
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return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
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distinguish between EOF & timeouts
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someday] */
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else
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return SERIAL_ERROR; /* Got an error from read */
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scb->bufcnt--;
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scb->bufp = scb->buf;
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return *scb->bufp++;
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}
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static int
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tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
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serial_t scb;
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serial_ttystate new_ttystate;
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serial_ttystate old_ttystate;
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{
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return 0;
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}
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static void
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tcp_print_tty_state (scb, ttystate)
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serial_t scb;
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serial_ttystate ttystate;
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{
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/* Nothing to print. */
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return;
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}
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static int
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tcp_setbaudrate(scb, rate)
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serial_t scb;
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int rate;
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{
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return 0; /* Never fails! */
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}
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static int
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tcp_set_process_group (scb, ttystate, group)
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serial_t scb;
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serial_ttystate ttystate;
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int group;
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{
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return 0;
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}
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static int
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tcp_write(scb, str, len)
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serial_t scb;
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const char *str;
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int len;
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{
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int cc;
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while (len > 0)
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{
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cc = write(scb->fd, str, len);
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if (cc < 0)
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return 1;
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len -= cc;
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str += cc;
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}
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return 0;
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}
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static void
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tcp_close(scb)
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serial_t scb;
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{
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if (scb->fd < 0)
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return;
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close(scb->fd);
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scb->fd = -1;
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}
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static struct serial_ops tcp_ops =
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{
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"tcp",
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0,
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tcp_open,
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tcp_close,
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tcp_readchar,
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tcp_write,
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tcp_flush_output,
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tcp_raw,
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tcp_get_tty_state,
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tcp_set_tty_state,
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tcp_print_tty_state,
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tcp_noflush_set_tty_state,
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tcp_setbaudrate,
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tcp_set_process_group
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};
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void
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_initialize_ser_tcp ()
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{
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serial_add_interface (&tcp_ops);
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}
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