version 1.209, 2004/03/11 10:21:17 |
version 1.209.2.2, 2005/03/10 17:15:05 |
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#include "xmalloc.h" |
#include "xmalloc.h" |
#include "packet.h" |
#include "packet.h" |
#include "buffer.h" |
#include "buffer.h" |
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#include "bufaux.h" |
#include "channels.h" |
#include "channels.h" |
#include "key.h" |
#include "key.h" |
#include "authfd.h" |
#include "authfd.h" |
#include "authfile.h" |
#include "authfile.h" |
#include "pathnames.h" |
#include "pathnames.h" |
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#include "dispatch.h" |
#include "clientloop.h" |
#include "clientloop.h" |
#include "log.h" |
#include "log.h" |
#include "readconf.h" |
#include "readconf.h" |
#include "sshconnect.h" |
#include "sshconnect.h" |
#include "tildexpand.h" |
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#include "dispatch.h" |
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#include "misc.h" |
#include "misc.h" |
#include "kex.h" |
#include "kex.h" |
#include "mac.h" |
#include "mac.h" |
#include "sshtty.h" |
#include "sshpty.h" |
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#include "match.h" |
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#include "msg.h" |
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#include "monitor_fdpass.h" |
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#include "uidswap.h" |
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#ifdef SMARTCARD |
#ifdef SMARTCARD |
#include "scard.h" |
#include "scard.h" |
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/* pid of proxycommand child process */ |
/* pid of proxycommand child process */ |
pid_t proxy_command_pid = 0; |
pid_t proxy_command_pid = 0; |
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/* fd to control socket */ |
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int control_fd = -1; |
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/* Multiplexing control command */ |
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static u_int mux_command = SSHMUX_COMMAND_OPEN; |
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/* Only used in control client mode */ |
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volatile sig_atomic_t control_client_terminate = 0; |
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u_int control_server_pid = 0; |
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/* Prints a help message to the user. This function never returns. */ |
/* Prints a help message to the user. This function never returns. */ |
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static void |
static void |
usage(void) |
usage(void) |
{ |
{ |
fprintf(stderr, |
fprintf(stderr, |
"usage: ssh [-1246AaCfghkNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
"usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
" [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n" |
" [-D port] [-e escape_char] [-F configfile]\n" |
" [-L port:host:hostport] [-l login_name] [-m mac_spec] [-o option]\n" |
" [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
" [-p port] [-R port:host:hostport] [user@]hostname [command]\n" |
" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
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" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
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" [user@]hostname [command]\n" |
); |
); |
exit(1); |
exit(1); |
} |
} |
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static int ssh_session(void); |
static int ssh_session(void); |
static int ssh_session2(void); |
static int ssh_session2(void); |
static void load_public_identity_files(void); |
static void load_public_identity_files(void); |
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static void control_client(const char *path); |
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/* |
/* |
* Main program for the ssh client. |
* Main program for the ssh client. |
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main(int ac, char **av) |
main(int ac, char **av) |
{ |
{ |
int i, opt, exit_status; |
int i, opt, exit_status; |
u_short fwd_port, fwd_host_port; |
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char sfwd_port[6], sfwd_host_port[6]; |
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char *p, *cp, *line, buf[256]; |
char *p, *cp, *line, buf[256]; |
struct stat st; |
struct stat st; |
struct passwd *pw; |
struct passwd *pw; |
int dummy; |
int dummy; |
extern int optind, optreset; |
extern int optind, optreset; |
extern char *optarg; |
extern char *optarg; |
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Forward fwd; |
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/* |
/* |
* Save the original real uid. It will be needed later (uid-swapping |
* Save the original real uid. It will be needed later (uid-swapping |
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again: |
again: |
while ((opt = getopt(ac, av, |
while ((opt = getopt(ac, av, |
"1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVXY")) != -1) { |
"1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVXY")) != -1) { |
switch (opt) { |
switch (opt) { |
case '1': |
case '1': |
options.protocol = SSH_PROTO_1; |
options.protocol = SSH_PROTO_1; |
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case 'g': |
case 'g': |
options.gateway_ports = 1; |
options.gateway_ports = 1; |
break; |
break; |
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case 'O': |
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if (strcmp(optarg, "check") == 0) |
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mux_command = SSHMUX_COMMAND_ALIVE_CHECK; |
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else if (strcmp(optarg, "exit") == 0) |
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mux_command = SSHMUX_COMMAND_TERMINATE; |
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else |
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fatal("Invalid multiplex command."); |
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break; |
case 'P': /* deprecated */ |
case 'P': /* deprecated */ |
options.use_privileged_port = 0; |
options.use_privileged_port = 0; |
break; |
break; |
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case 'i': |
case 'i': |
if (stat(optarg, &st) < 0) { |
if (stat(optarg, &st) < 0) { |
fprintf(stderr, "Warning: Identity file %s " |
fprintf(stderr, "Warning: Identity file %s " |
"does not exist.\n", optarg); |
"not accessible: %s.\n", optarg, |
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strerror(errno)); |
break; |
break; |
} |
} |
if (options.num_identity_files >= |
if (options.num_identity_files >= |
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options.log_level++; |
options.log_level++; |
break; |
break; |
} |
} |
/* fallthrough */ |
/* FALLTHROUGH */ |
case 'V': |
case 'V': |
fprintf(stderr, "%s, %s\n", |
fprintf(stderr, "%s, %s\n", |
SSH_VERSION, SSLeay_version(SSLEAY_VERSION)); |
SSH_VERSION, SSLeay_version(SSLEAY_VERSION)); |
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if (ciphers_valid(optarg)) { |
if (ciphers_valid(optarg)) { |
/* SSH2 only */ |
/* SSH2 only */ |
options.ciphers = xstrdup(optarg); |
options.ciphers = xstrdup(optarg); |
options.cipher = SSH_CIPHER_ILLEGAL; |
options.cipher = SSH_CIPHER_INVALID; |
} else { |
} else { |
/* SSH1 only */ |
/* SSH1 only */ |
options.cipher = cipher_number(optarg); |
options.cipher = cipher_number(optarg); |
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exit(1); |
exit(1); |
} |
} |
break; |
break; |
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case 'M': |
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options.control_master = |
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(options.control_master >= 1) ? 2 : 1; |
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break; |
case 'p': |
case 'p': |
options.port = a2port(optarg); |
options.port = a2port(optarg); |
if (options.port == 0) { |
if (options.port == 0) { |
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break; |
break; |
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case 'L': |
case 'L': |
case 'R': |
if (parse_forward(&fwd, optarg)) |
if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", |
add_local_forward(&options, &fwd); |
sfwd_port, buf, sfwd_host_port) != 3 && |
else { |
sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", |
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sfwd_port, buf, sfwd_host_port) != 3) { |
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fprintf(stderr, |
fprintf(stderr, |
"Bad forwarding specification '%s'\n", |
"Bad local forwarding specification '%s'\n", |
optarg); |
optarg); |
usage(); |
exit(1); |
/* NOTREACHED */ |
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} |
} |
if ((fwd_port = a2port(sfwd_port)) == 0 || |
break; |
(fwd_host_port = a2port(sfwd_host_port)) == 0) { |
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case 'R': |
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if (parse_forward(&fwd, optarg)) { |
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add_remote_forward(&options, &fwd); |
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} else { |
fprintf(stderr, |
fprintf(stderr, |
"Bad forwarding port(s) '%s'\n", optarg); |
"Bad remote forwarding specification " |
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"'%s'\n", optarg); |
exit(1); |
exit(1); |
} |
} |
if (opt == 'L') |
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add_local_forward(&options, fwd_port, buf, |
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fwd_host_port); |
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else if (opt == 'R') |
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add_remote_forward(&options, fwd_port, buf, |
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fwd_host_port); |
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break; |
break; |
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case 'D': |
case 'D': |
fwd_port = a2port(optarg); |
cp = p = xstrdup(optarg); |
if (fwd_port == 0) { |
memset(&fwd, '\0', sizeof(fwd)); |
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fwd.connect_host = "socks"; |
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if ((fwd.listen_host = hpdelim(&cp)) == NULL) { |
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fprintf(stderr, "Bad dynamic forwarding " |
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"specification '%.100s'\n", optarg); |
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exit(1); |
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} |
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if (cp != NULL) { |
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fwd.listen_port = a2port(cp); |
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fwd.listen_host = cleanhostname(fwd.listen_host); |
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} else { |
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fwd.listen_port = a2port(fwd.listen_host); |
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fwd.listen_host = ""; |
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} |
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if (fwd.listen_port == 0) { |
fprintf(stderr, "Bad dynamic port '%s'\n", |
fprintf(stderr, "Bad dynamic port '%s'\n", |
optarg); |
optarg); |
exit(1); |
exit(1); |
} |
} |
add_local_forward(&options, fwd_port, "socks", 0); |
add_local_forward(&options, &fwd); |
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xfree(p); |
break; |
break; |
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case 'C': |
case 'C': |
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case 's': |
case 's': |
subsystem_flag = 1; |
subsystem_flag = 1; |
break; |
break; |
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case 'S': |
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if (options.control_path != NULL) |
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free(options.control_path); |
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options.control_path = xstrdup(optarg); |
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break; |
case 'b': |
case 'b': |
options.bind_address = optarg; |
options.bind_address = optarg; |
break; |
break; |
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* file if the user specifies a config file on the command line. |
* file if the user specifies a config file on the command line. |
*/ |
*/ |
if (config != NULL) { |
if (config != NULL) { |
if (!read_config_file(config, host, &options)) |
if (!read_config_file(config, host, &options, 0)) |
fatal("Can't open user config file %.100s: " |
fatal("Can't open user config file %.100s: " |
"%.100s", config, strerror(errno)); |
"%.100s", config, strerror(errno)); |
} else { |
} else { |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
_PATH_SSH_USER_CONFFILE); |
_PATH_SSH_USER_CONFFILE); |
(void)read_config_file(buf, host, &options); |
(void)read_config_file(buf, host, &options, 1); |
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/* Read systemwide configuration file after use config. */ |
/* Read systemwide configuration file after use config. */ |
(void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
(void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
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&options, 0); |
} |
} |
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/* Fill configuration defaults. */ |
/* Fill configuration defaults. */ |
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strcmp(options.proxy_command, "none") == 0) |
strcmp(options.proxy_command, "none") == 0) |
options.proxy_command = NULL; |
options.proxy_command = NULL; |
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if (options.control_path != NULL) { |
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options.control_path = tilde_expand_filename( |
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options.control_path, original_real_uid); |
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} |
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if (options.control_path != NULL && options.control_master == 0) |
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control_client(options.control_path); /* This doesn't return */ |
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/* Open a connection to the remote host. */ |
/* Open a connection to the remote host. */ |
if (ssh_connect(host, &hostaddr, options.port, |
if (ssh_connect(host, &hostaddr, options.port, |
options.address_family, options.connection_attempts, |
options.address_family, options.connection_attempts, |
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* user's home directory if it happens to be on a NFS volume where |
* user's home directory if it happens to be on a NFS volume where |
* root is mapped to nobody. |
* root is mapped to nobody. |
*/ |
*/ |
seteuid(original_real_uid); |
if (original_effective_uid == 0) { |
setuid(original_real_uid); |
PRIV_START; |
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permanently_set_uid(pw); |
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} |
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/* |
/* |
* Now that we are back to our own permissions, create ~/.ssh |
* Now that we are back to our own permissions, create ~/.ssh |
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exit_status = compat20 ? ssh_session2() : ssh_session(); |
exit_status = compat20 ? ssh_session2() : ssh_session(); |
packet_close(); |
packet_close(); |
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if (options.control_path != NULL && control_fd != -1) |
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unlink(options.control_path); |
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/* |
/* |
* Send SIGHUP to proxy command if used. We don't wait() in |
* Send SIGHUP to proxy command if used. We don't wait() in |
* case it hangs and instead rely on init to reap the child |
* case it hangs and instead rely on init to reap the child |
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* for the local connection. |
* for the local connection. |
*/ |
*/ |
if (!got_data) { |
if (!got_data) { |
u_int32_t rand = 0; |
u_int32_t rnd = 0; |
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logit("Warning: No xauth data; " |
logit("Warning: No xauth data; " |
"using fake authentication data for X11 forwarding."); |
"using fake authentication data for X11 forwarding."); |
strlcpy(proto, SSH_X11_PROTO, sizeof proto); |
strlcpy(proto, SSH_X11_PROTO, sizeof proto); |
for (i = 0; i < 16; i++) { |
for (i = 0; i < 16; i++) { |
if (i % 4 == 0) |
if (i % 4 == 0) |
rand = arc4random(); |
rnd = arc4random(); |
snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
rand & 0xff); |
rnd & 0xff); |
rand >>= 8; |
rnd >>= 8; |
} |
} |
} |
} |
} |
} |
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/* Initiate local TCP/IP port forwardings. */ |
/* Initiate local TCP/IP port forwardings. */ |
for (i = 0; i < options.num_local_forwards; i++) { |
for (i = 0; i < options.num_local_forwards; i++) { |
debug("Connections to local port %d forwarded to remote address %.200s:%d", |
debug("Local connections to %.200s:%d forwarded to remote " |
options.local_forwards[i].port, |
"address %.200s:%d", |
options.local_forwards[i].host, |
(options.local_forwards[i].listen_host == NULL) ? |
options.local_forwards[i].host_port); |
(options.gateway_ports ? "*" : "LOCALHOST") : |
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options.local_forwards[i].listen_host, |
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options.local_forwards[i].listen_port, |
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options.local_forwards[i].connect_host, |
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options.local_forwards[i].connect_port); |
success += channel_setup_local_fwd_listener( |
success += channel_setup_local_fwd_listener( |
options.local_forwards[i].port, |
options.local_forwards[i].listen_host, |
options.local_forwards[i].host, |
options.local_forwards[i].listen_port, |
options.local_forwards[i].host_port, |
options.local_forwards[i].connect_host, |
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options.local_forwards[i].connect_port, |
options.gateway_ports); |
options.gateway_ports); |
} |
} |
if (i > 0 && success == 0) |
if (i > 0 && success == 0) |
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/* Initiate remote TCP/IP port forwardings. */ |
/* Initiate remote TCP/IP port forwardings. */ |
for (i = 0; i < options.num_remote_forwards; i++) { |
for (i = 0; i < options.num_remote_forwards; i++) { |
debug("Connections to remote port %d forwarded to local address %.200s:%d", |
debug("Remote connections from %.200s:%d forwarded to " |
options.remote_forwards[i].port, |
"local address %.200s:%d", |
options.remote_forwards[i].host, |
options.remote_forwards[i].listen_host, |
options.remote_forwards[i].host_port); |
options.remote_forwards[i].listen_port, |
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options.remote_forwards[i].connect_host, |
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options.remote_forwards[i].connect_port); |
channel_request_remote_forwarding( |
channel_request_remote_forwarding( |
options.remote_forwards[i].port, |
options.remote_forwards[i].listen_host, |
options.remote_forwards[i].host, |
options.remote_forwards[i].listen_port, |
options.remote_forwards[i].host_port); |
options.remote_forwards[i].connect_host, |
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options.remote_forwards[i].connect_port); |
} |
} |
} |
} |
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} |
} |
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static void |
static void |
client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
{ |
{ |
int id, len; |
int id, len; |
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return; |
return; |
debug("remote forward %s for: listen %d, connect %s:%d", |
debug("remote forward %s for: listen %d, connect %s:%d", |
type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", |
type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", |
options.remote_forwards[i].port, |
options.remote_forwards[i].listen_port, |
options.remote_forwards[i].host, |
options.remote_forwards[i].connect_host, |
options.remote_forwards[i].host_port); |
options.remote_forwards[i].connect_port); |
if (type == SSH2_MSG_REQUEST_FAILURE) |
if (type == SSH2_MSG_REQUEST_FAILURE) |
logit("Warning: remote port forwarding failed for listen port %d", |
logit("Warning: remote port forwarding failed for listen " |
options.remote_forwards[i].port); |
"port %d", options.remote_forwards[i].listen_port); |
} |
} |
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/* request pty/x11/agent/tcpfwd/shell for channel */ |
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static void |
static void |
ssh_session2_setup(int id, void *arg) |
ssh_control_listener(void) |
{ |
{ |
int len; |
struct sockaddr_un addr; |
int interactive = 0; |
mode_t old_umask; |
struct termios tio; |
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debug2("ssh_session2_setup: id %d", id); |
if (options.control_path == NULL || options.control_master <= 0) |
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return; |
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if (tty_flag) { |
memset(&addr, '\0', sizeof(addr)); |
struct winsize ws; |
addr.sun_family = AF_UNIX; |
char *cp; |
addr.sun_len = offsetof(struct sockaddr_un, sun_path) + |
cp = getenv("TERM"); |
strlen(options.control_path) + 1; |
if (!cp) |
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cp = ""; |
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/* Store window size in the packet. */ |
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if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
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memset(&ws, 0, sizeof(ws)); |
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channel_request_start(id, "pty-req", 0); |
if (strlcpy(addr.sun_path, options.control_path, |
packet_put_cstring(cp); |
sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
packet_put_int(ws.ws_col); |
fatal("ControlPath too long"); |
packet_put_int(ws.ws_row); |
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packet_put_int(ws.ws_xpixel); |
if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
packet_put_int(ws.ws_ypixel); |
fatal("%s socket(): %s\n", __func__, strerror(errno)); |
tio = get_saved_tio(); |
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tty_make_modes(/*ignored*/ 0, &tio); |
old_umask = umask(0177); |
packet_send(); |
if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) { |
interactive = 1; |
control_fd = -1; |
/* XXX wait for reply */ |
if (errno == EINVAL) |
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fatal("ControlSocket %s already exists", |
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options.control_path); |
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else |
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fatal("%s bind(): %s\n", __func__, strerror(errno)); |
} |
} |
if (options.forward_x11 && |
umask(old_umask); |
getenv("DISPLAY") != NULL) { |
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if (listen(control_fd, 64) == -1) |
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fatal("%s listen(): %s\n", __func__, strerror(errno)); |
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set_nonblock(control_fd); |
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} |
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/* request pty/x11/agent/tcpfwd/shell for channel */ |
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static void |
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ssh_session2_setup(int id, void *arg) |
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{ |
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extern char **environ; |
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int interactive = tty_flag; |
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if (options.forward_x11 && getenv("DISPLAY") != NULL) { |
char *proto, *data; |
char *proto, *data; |
/* Get reasonable local authentication information. */ |
/* Get reasonable local authentication information. */ |
x11_get_proto(&proto, &data); |
x11_get_proto(&proto, &data); |
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packet_send(); |
packet_send(); |
} |
} |
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len = buffer_len(&command); |
client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
if (len > 0) { |
NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); |
if (len > 900) |
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len = 900; |
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if (subsystem_flag) { |
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debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
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channel_request_start(id, "subsystem", /*want reply*/ 1); |
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/* register callback for reply */ |
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/* XXX we assume that client_loop has already been called */ |
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dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
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dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); |
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} else { |
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debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
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channel_request_start(id, "exec", 0); |
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} |
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packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
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packet_send(); |
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} else { |
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channel_request_start(id, "shell", 0); |
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packet_send(); |
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} |
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packet_set_interactive(interactive); |
packet_set_interactive(interactive); |
} |
} |
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|
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channel_send_open(c->self); |
channel_send_open(c->self); |
if (!no_shell_flag) |
if (!no_shell_flag) |
channel_register_confirm(c->self, ssh_session2_setup); |
channel_register_confirm(c->self, ssh_session2_setup, NULL); |
|
|
return c->self; |
return c->self; |
} |
} |
|
|
|
|
/* XXX should be pre-session */ |
/* XXX should be pre-session */ |
ssh_init_forwarding(); |
ssh_init_forwarding(); |
|
ssh_control_listener(); |
|
|
if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
id = ssh_session2_open(); |
id = ssh_session2_open(); |
|
|
options.identity_files[i] = filename; |
options.identity_files[i] = filename; |
options.identity_keys[i] = public; |
options.identity_keys[i] = public; |
} |
} |
|
} |
|
|
|
static void |
|
control_client_sighandler(int signo) |
|
{ |
|
control_client_terminate = signo; |
|
} |
|
|
|
static void |
|
control_client_sigrelay(int signo) |
|
{ |
|
if (control_server_pid > 1) |
|
kill(control_server_pid, signo); |
|
} |
|
|
|
static int |
|
env_permitted(char *env) |
|
{ |
|
int i; |
|
char name[1024], *cp; |
|
|
|
strlcpy(name, env, sizeof(name)); |
|
if ((cp = strchr(name, '=')) == NULL) |
|
return (0); |
|
|
|
*cp = '\0'; |
|
|
|
for (i = 0; i < options.num_send_env; i++) |
|
if (match_pattern(name, options.send_env[i])) |
|
return (1); |
|
|
|
return (0); |
|
} |
|
|
|
static void |
|
control_client(const char *path) |
|
{ |
|
struct sockaddr_un addr; |
|
int i, r, fd, sock, exitval, num_env; |
|
Buffer m; |
|
char *term; |
|
extern char **environ; |
|
u_int flags; |
|
|
|
if (stdin_null_flag) { |
|
if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) |
|
fatal("open(/dev/null): %s", strerror(errno)); |
|
if (dup2(fd, STDIN_FILENO) == -1) |
|
fatal("dup2: %s", strerror(errno)); |
|
if (fd > STDERR_FILENO) |
|
close(fd); |
|
} |
|
|
|
memset(&addr, '\0', sizeof(addr)); |
|
addr.sun_family = AF_UNIX; |
|
addr.sun_len = offsetof(struct sockaddr_un, sun_path) + |
|
strlen(path) + 1; |
|
|
|
if (strlcpy(addr.sun_path, path, |
|
sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
|
fatal("ControlPath too long"); |
|
|
|
if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
|
fatal("%s socket(): %s", __func__, strerror(errno)); |
|
|
|
if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) |
|
fatal("Couldn't connect to %s: %s", path, strerror(errno)); |
|
|
|
if ((term = getenv("TERM")) == NULL) |
|
term = ""; |
|
|
|
flags = 0; |
|
if (tty_flag) |
|
flags |= SSHMUX_FLAG_TTY; |
|
if (subsystem_flag) |
|
flags |= SSHMUX_FLAG_SUBSYS; |
|
|
|
buffer_init(&m); |
|
|
|
/* Send our command to server */ |
|
buffer_put_int(&m, mux_command); |
|
buffer_put_int(&m, flags); |
|
if (ssh_msg_send(sock, /* version */1, &m) == -1) |
|
fatal("%s: msg_send", __func__); |
|
buffer_clear(&m); |
|
|
|
/* Get authorisation status and PID of controlee */ |
|
if (ssh_msg_recv(sock, &m) == -1) |
|
fatal("%s: msg_recv", __func__); |
|
if (buffer_get_char(&m) != 1) |
|
fatal("%s: wrong version", __func__); |
|
if (buffer_get_int(&m) != 1) |
|
fatal("Connection to master denied"); |
|
control_server_pid = buffer_get_int(&m); |
|
|
|
buffer_clear(&m); |
|
|
|
switch (mux_command) { |
|
case SSHMUX_COMMAND_ALIVE_CHECK: |
|
fprintf(stderr, "Master running (pid=%d)\r\n", |
|
control_server_pid); |
|
exit(0); |
|
case SSHMUX_COMMAND_TERMINATE: |
|
fprintf(stderr, "Exit request sent.\r\n"); |
|
exit(0); |
|
case SSHMUX_COMMAND_OPEN: |
|
/* continue below */ |
|
break; |
|
default: |
|
fatal("silly mux_command %d", mux_command); |
|
} |
|
|
|
/* SSHMUX_COMMAND_OPEN */ |
|
buffer_put_cstring(&m, term); |
|
buffer_append(&command, "\0", 1); |
|
buffer_put_cstring(&m, buffer_ptr(&command)); |
|
|
|
if (options.num_send_env == 0 || environ == NULL) { |
|
buffer_put_int(&m, 0); |
|
} else { |
|
/* Pass environment */ |
|
num_env = 0; |
|
for (i = 0; environ[i] != NULL; i++) |
|
if (env_permitted(environ[i])) |
|
num_env++; /* Count */ |
|
|
|
buffer_put_int(&m, num_env); |
|
|
|
for (i = 0; environ[i] != NULL && num_env >= 0; i++) |
|
if (env_permitted(environ[i])) { |
|
num_env--; |
|
buffer_put_cstring(&m, environ[i]); |
|
} |
|
} |
|
|
|
if (ssh_msg_send(sock, /* version */1, &m) == -1) |
|
fatal("%s: msg_send", __func__); |
|
|
|
mm_send_fd(sock, STDIN_FILENO); |
|
mm_send_fd(sock, STDOUT_FILENO); |
|
mm_send_fd(sock, STDERR_FILENO); |
|
|
|
/* Wait for reply, so master has a chance to gather ttymodes */ |
|
buffer_clear(&m); |
|
if (ssh_msg_recv(sock, &m) == -1) |
|
fatal("%s: msg_recv", __func__); |
|
if (buffer_get_char(&m) != 1) |
|
fatal("%s: wrong version", __func__); |
|
buffer_free(&m); |
|
|
|
signal(SIGHUP, control_client_sighandler); |
|
signal(SIGINT, control_client_sighandler); |
|
signal(SIGTERM, control_client_sighandler); |
|
signal(SIGWINCH, control_client_sigrelay); |
|
|
|
if (tty_flag) |
|
enter_raw_mode(); |
|
|
|
/* Stick around until the controlee closes the client_fd */ |
|
exitval = 0; |
|
for (;!control_client_terminate;) { |
|
r = read(sock, &exitval, sizeof(exitval)); |
|
if (r == 0) { |
|
debug2("Received EOF from master"); |
|
break; |
|
} |
|
if (r > 0) |
|
debug2("Received exit status from master %d", exitval); |
|
if (r == -1 && errno != EINTR) |
|
fatal("%s: read %s", __func__, strerror(errno)); |
|
} |
|
|
|
if (control_client_terminate) |
|
debug2("Exiting on signal %d", control_client_terminate); |
|
|
|
close(sock); |
|
|
|
leave_raw_mode(); |
|
|
|
if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) |
|
fprintf(stderr, "Connection to master closed.\r\n"); |
|
|
|
exit(exitval); |
} |
} |