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Code Issues Releases Wiki Activity

ssh_bind_accept -> ssh_bind_accept_fd

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This commit is contained in:
Nicolas Viennot 2019-08-24 16:49:48 -04:00
parent 004fe379f6
commit 6a271c5a89
1 changed files with 36 additions and 28 deletions
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64
tmate-ssh-server.c
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@ -238,9 +238,6 @@ static void client_bootstrap(struct tmate_session *_session)
&flag, sizeof(flag));
}
signal(SIGALRM, handle_sigalrm);
alarm(grace_period);
/*
* We should die early if we can't connect to websocket server. This
* way the tmate daemon will pick another server to work on.
@ -281,7 +278,7 @@ static void client_bootstrap(struct tmate_session *_session)
/* never reached */
}
static int get_ip(int fd, char *dst, size_t len)
static int get_client_ip(int fd, char *dst, size_t len)
{
struct sockaddr sa;
socklen_t sa_len = sizeof(sa);
@ -367,9 +364,7 @@ static void handle_sigchld(__unused int sig)
while ((pid = waitpid(WAIT_ANY, &status, WNOHANG)) > 0) {
/*
* It's not safe to call indirectly malloc() here, because
* of potential deadlocks with ssh_bind_accept() which also
* calls malloc(). (And we can't even block singals because
* the accept() call is blocking.
* of potential deadlocks with other malloc() calls.
*/
#if 0
if (WIFEXITED(status))
@ -395,39 +390,52 @@ void tmate_ssh_server_main(struct tmate_session *session, const char *keys_dir,
struct tmate_ssh_client *client = &session->ssh_client;
ssh_bind bind;
pid_t pid;
int fd;
signal(SIGSEGV, handle_sigsegv);
signal(SIGCHLD, handle_sigchld);
bind = prepare_ssh(keys_dir, bind_addr, port);
client->session = ssh_new();
client->channel = NULL;
client->winsize_pty.ws_col = 80;
client->winsize_pty.ws_row = 24;
session->session_token = "init";
if (!client->session)
tmate_fatal("Cannot initialize session");
for (;;) {
client->session = ssh_new();
client->channel = NULL;
client->winsize_pty.ws_col = 80;
client->winsize_pty.ws_row = 24;
if (!client->session)
tmate_fatal("Cannot initialize session");
if (ssh_bind_accept(bind, client->session) < 0)
tmate_fatal("Error accepting connection: %s", ssh_get_error(bind));
if (get_ip(ssh_get_fd(client->session),
client->ip_address, sizeof(client->ip_address)) < 0)
tmate_fatal("Error getting IP address from connection");
fd = accept(ssh_bind_get_fd(bind), NULL, NULL);
if (fd < 0)
tmate_fatal("Error accepting connection");
if ((pid = fork()) < 0)
tmate_fatal("Can't fork");
if (pid) {
tmate_info("Child spawned pid=%d, ip=%s",
pid, client->ip_address);
ssh_free(client->session);
} else {
ssh_bind_free(bind);
session->session_token = "init";
client_bootstrap(session);
/* Parent process */
close(fd);
continue;
}
/* Child process */
signal(SIGALRM, handle_sigalrm);
alarm(TMATE_SSH_GRACE_PERIOD);
if (get_client_ip(fd, client->ip_address, sizeof(client->ip_address)) < 0)
tmate_fatal("Error getting Client IP from connection");
tmate_info("Connection accepted ip=%s", client->ip_address);
if (ssh_bind_accept_fd(bind, client->session, fd) < 0)
tmate_fatal("Error accepting connection: %s", ssh_get_error(bind));
ssh_bind_free(bind);
client_bootstrap(session);
/* never reached */
}
}