| /* Serial interface for raw TCP connections on Un*x like systems. |
| |
| Copyright (C) 1992-1996, 1998-1999, 2001, 2005-2012 Free Software |
| Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "serial.h" |
| #include "ser-base.h" |
| #include "ser-tcp.h" |
| #include "gdbcmd.h" |
| #include "cli/cli-decode.h" |
| #include "cli/cli-setshow.h" |
| |
| #include <sys/types.h> |
| |
| #ifdef HAVE_SYS_FILIO_H |
| #include <sys/filio.h> /* For FIONBIO. */ |
| #endif |
| #ifdef HAVE_SYS_IOCTL_H |
| #include <sys/ioctl.h> /* For FIONBIO. */ |
| #endif |
| |
| #include <sys/time.h> |
| |
| #ifdef USE_WIN32API |
| #include <winsock2.h> |
| #ifndef ETIMEDOUT |
| #define ETIMEDOUT WSAETIMEDOUT |
| #endif |
| #define close(fd) closesocket (fd) |
| #define ioctl ioctlsocket |
| #else |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <netdb.h> |
| #include <sys/socket.h> |
| #include <netinet/tcp.h> |
| #endif |
| |
| #include <signal.h> |
| #include "gdb_string.h" |
| #include "gdb_select.h" |
| |
| #ifndef HAVE_SOCKLEN_T |
| typedef int socklen_t; |
| #endif |
| |
| void _initialize_ser_tcp (void); |
| |
| /* For "set tcp" and "show tcp". */ |
| |
| static struct cmd_list_element *tcp_set_cmdlist; |
| static struct cmd_list_element *tcp_show_cmdlist; |
| |
| /* Whether to auto-retry refused connections. */ |
| |
| static int tcp_auto_retry = 1; |
| |
| /* Timeout period for connections, in seconds. */ |
| |
| static int tcp_retry_limit = 15; |
| |
| /* How many times per second to poll deprecated_ui_loop_hook. */ |
| |
| #define POLL_INTERVAL 5 |
| |
| /* Helper function to wait a while. If SCB is non-null, wait on its |
| file descriptor. Otherwise just wait on a timeout, updating *POLLS. |
| Returns -1 on timeout or interrupt, otherwise the value of select. */ |
| |
| static int |
| wait_for_connect (struct serial *scb, int *polls) |
| { |
| struct timeval t; |
| int n; |
| |
| /* While we wait for the connect to complete, |
| poll the UI so it can update or the user can |
| interrupt. */ |
| if (deprecated_ui_loop_hook && deprecated_ui_loop_hook (0)) |
| { |
| errno = EINTR; |
| return -1; |
| } |
| |
| /* Check for timeout. */ |
| if (*polls > tcp_retry_limit * POLL_INTERVAL) |
| { |
| errno = ETIMEDOUT; |
| return -1; |
| } |
| |
| /* Back off to polling once per second after the first POLL_INTERVAL |
| polls. */ |
| if (*polls < POLL_INTERVAL) |
| { |
| t.tv_sec = 0; |
| t.tv_usec = 1000000 / POLL_INTERVAL; |
| } |
| else |
| { |
| t.tv_sec = 1; |
| t.tv_usec = 0; |
| } |
| |
| if (scb) |
| { |
| fd_set rset, wset, eset; |
| |
| FD_ZERO (&rset); |
| FD_SET (scb->fd, &rset); |
| wset = rset; |
| eset = rset; |
| |
| /* POSIX systems return connection success or failure by signalling |
| wset. Windows systems return success in wset and failure in |
| eset. |
| |
| We must call select here, rather than gdb_select, because |
| the serial structure has not yet been initialized - the |
| MinGW select wrapper will not know that this FD refers |
| to a socket. */ |
| n = select (scb->fd + 1, &rset, &wset, &eset, &t); |
| } |
| else |
| /* Use gdb_select here, since we have no file descriptors, and on |
| Windows, plain select doesn't work in that case. */ |
| n = gdb_select (0, NULL, NULL, NULL, &t); |
| |
| /* If we didn't time out, only count it as one poll. */ |
| if (n > 0 || *polls < POLL_INTERVAL) |
| (*polls)++; |
| else |
| (*polls) += POLL_INTERVAL; |
| |
| return n; |
| } |
| |
| /* Open a tcp socket. */ |
| |
| int |
| net_open (struct serial *scb, const char *name) |
| { |
| char *port_str, hostname[100]; |
| int n, port, tmp; |
| int use_udp; |
| struct hostent *hostent; |
| struct sockaddr_in sockaddr; |
| #ifdef USE_WIN32API |
| u_long ioarg; |
| #else |
| int ioarg; |
| #endif |
| int polls = 0; |
| |
| use_udp = 0; |
| if (strncmp (name, "udp:", 4) == 0) |
| { |
| use_udp = 1; |
| name = name + 4; |
| } |
| else if (strncmp (name, "tcp:", 4) == 0) |
| name = name + 4; |
| |
| port_str = strchr (name, ':'); |
| |
| if (!port_str) |
| error (_("net_open: No colon in host name!")); /* Shouldn't ever |
| happen. */ |
| |
| tmp = min (port_str - name, (int) sizeof hostname - 1); |
| strncpy (hostname, name, tmp); /* Don't want colon. */ |
| hostname[tmp] = '\000'; /* Tie off host name. */ |
| port = atoi (port_str + 1); |
| |
| /* Default hostname is localhost. */ |
| if (!hostname[0]) |
| strcpy (hostname, "localhost"); |
| |
| hostent = gethostbyname (hostname); |
| if (!hostent) |
| { |
| fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname); |
| errno = ENOENT; |
| return -1; |
| } |
| |
| sockaddr.sin_family = PF_INET; |
| sockaddr.sin_port = htons (port); |
| memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr, |
| sizeof (struct in_addr)); |
| |
| retry: |
| |
| if (use_udp) |
| scb->fd = socket (PF_INET, SOCK_DGRAM, 0); |
| else |
| scb->fd = socket (PF_INET, SOCK_STREAM, 0); |
| |
| if (scb->fd == -1) |
| return -1; |
| |
| /* Set socket nonblocking. */ |
| ioarg = 1; |
| ioctl (scb->fd, FIONBIO, &ioarg); |
| |
| /* Use Non-blocking connect. connect() will return 0 if connected |
| already. */ |
| n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr)); |
| |
| if (n < 0) |
| { |
| #ifdef USE_WIN32API |
| int err = WSAGetLastError(); |
| #else |
| int err = errno; |
| #endif |
| |
| /* Maybe we're waiting for the remote target to become ready to |
| accept connections. */ |
| if (tcp_auto_retry |
| #ifdef USE_WIN32API |
| && err == WSAECONNREFUSED |
| #else |
| && err == ECONNREFUSED |
| #endif |
| && wait_for_connect (NULL, &polls) >= 0) |
| { |
| close (scb->fd); |
| goto retry; |
| } |
| |
| if ( |
| #ifdef USE_WIN32API |
| /* Under Windows, calling "connect" with a non-blocking socket |
| results in WSAEWOULDBLOCK, not WSAEINPROGRESS. */ |
| err != WSAEWOULDBLOCK |
| #else |
| err != EINPROGRESS |
| #endif |
| ) |
| { |
| errno = err; |
| net_close (scb); |
| return -1; |
| } |
| |
| /* Looks like we need to wait for the connect. */ |
| do |
| { |
| n = wait_for_connect (scb, &polls); |
| } |
| while (n == 0); |
| if (n < 0) |
| { |
| net_close (scb); |
| return -1; |
| } |
| } |
| |
| /* Got something. Is it an error? */ |
| { |
| int res, err; |
| socklen_t len; |
| |
| len = sizeof (err); |
| /* On Windows, the fourth parameter to getsockopt is a "char *"; |
| on UNIX systems it is generally "void *". The cast to "void *" |
| is OK everywhere, since in C "void *" can be implicitly |
| converted to any pointer type. */ |
| res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len); |
| if (res < 0 || err) |
| { |
| /* Maybe the target still isn't ready to accept the connection. */ |
| if (tcp_auto_retry |
| #ifdef USE_WIN32API |
| && err == WSAECONNREFUSED |
| #else |
| && err == ECONNREFUSED |
| #endif |
| && wait_for_connect (NULL, &polls) >= 0) |
| { |
| close (scb->fd); |
| goto retry; |
| } |
| if (err) |
| errno = err; |
| net_close (scb); |
| return -1; |
| } |
| } |
| |
| /* Turn off nonblocking. */ |
| ioarg = 0; |
| ioctl (scb->fd, FIONBIO, &ioarg); |
| |
| if (use_udp == 0) |
| { |
| /* Disable Nagle algorithm. Needed in some cases. */ |
| tmp = 1; |
| setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY, |
| (char *)&tmp, sizeof (tmp)); |
| } |
| |
| #ifdef SIGPIPE |
| /* If we don't do this, then GDB simply exits |
| when the remote side dies. */ |
| signal (SIGPIPE, SIG_IGN); |
| #endif |
| |
| return 0; |
| } |
| |
| void |
| net_close (struct serial *scb) |
| { |
| if (scb->fd == -1) |
| return; |
| |
| close (scb->fd); |
| scb->fd = -1; |
| } |
| |
| int |
| net_read_prim (struct serial *scb, size_t count) |
| { |
| return recv (scb->fd, scb->buf, count, 0); |
| } |
| |
| int |
| net_write_prim (struct serial *scb, const void *buf, size_t count) |
| { |
| return send (scb->fd, buf, count, 0); |
| } |
| |
| int |
| ser_tcp_send_break (struct serial *scb) |
| { |
| /* Send telnet IAC and BREAK characters. */ |
| return (serial_write (scb, "\377\363", 2)); |
| } |
| |
| /* Support for "set tcp" and "show tcp" commands. */ |
| |
| static void |
| set_tcp_cmd (char *args, int from_tty) |
| { |
| help_list (tcp_set_cmdlist, "set tcp ", -1, gdb_stdout); |
| } |
| |
| static void |
| show_tcp_cmd (char *args, int from_tty) |
| { |
| help_list (tcp_show_cmdlist, "show tcp ", -1, gdb_stdout); |
| } |
| |
| |
| void |
| _initialize_ser_tcp (void) |
| { |
| #ifdef USE_WIN32API |
| /* Do nothing; the TCP serial operations will be initialized in |
| ser-mingw.c. */ |
| #else |
| struct serial_ops *ops; |
| |
| ops = XMALLOC (struct serial_ops); |
| memset (ops, 0, sizeof (struct serial_ops)); |
| ops->name = "tcp"; |
| ops->next = 0; |
| ops->open = net_open; |
| ops->close = net_close; |
| ops->readchar = ser_base_readchar; |
| ops->write = ser_base_write; |
| ops->flush_output = ser_base_flush_output; |
| ops->flush_input = ser_base_flush_input; |
| ops->send_break = ser_tcp_send_break; |
| ops->go_raw = ser_base_raw; |
| ops->get_tty_state = ser_base_get_tty_state; |
| ops->copy_tty_state = ser_base_copy_tty_state; |
| ops->set_tty_state = ser_base_set_tty_state; |
| ops->print_tty_state = ser_base_print_tty_state; |
| ops->noflush_set_tty_state = ser_base_noflush_set_tty_state; |
| ops->setbaudrate = ser_base_setbaudrate; |
| ops->setstopbits = ser_base_setstopbits; |
| ops->drain_output = ser_base_drain_output; |
| ops->async = ser_base_async; |
| ops->read_prim = net_read_prim; |
| ops->write_prim = net_write_prim; |
| serial_add_interface (ops); |
| #endif /* USE_WIN32API */ |
| |
| add_prefix_cmd ("tcp", class_maintenance, set_tcp_cmd, _("\ |
| TCP protocol specific variables\n\ |
| Configure variables specific to remote TCP connections"), |
| &tcp_set_cmdlist, "set tcp ", |
| 0 /* allow-unknown */, &setlist); |
| add_prefix_cmd ("tcp", class_maintenance, show_tcp_cmd, _("\ |
| TCP protocol specific variables\n\ |
| Configure variables specific to remote TCP connections"), |
| &tcp_show_cmdlist, "show tcp ", |
| 0 /* allow-unknown */, &showlist); |
| |
| add_setshow_boolean_cmd ("auto-retry", class_obscure, |
| &tcp_auto_retry, _("\ |
| Set auto-retry on socket connect"), _("\ |
| Show auto-retry on socket connect"), |
| NULL, NULL, NULL, |
| &tcp_set_cmdlist, &tcp_show_cmdlist); |
| |
| add_setshow_uinteger_cmd ("connect-timeout", class_obscure, |
| &tcp_retry_limit, _("\ |
| Set timeout limit for socket connection"), _("\ |
| Show timeout limit for socket connection"), |
| NULL, NULL, NULL, |
| &tcp_set_cmdlist, &tcp_show_cmdlist); |
| } |