* Set process group corrections, initial busybox port
*/
-/*#define DEBUG 1 */
#define DEBUG 0
-#include "busybox.h"
+#include "libbb.h"
#if DEBUG
#define TELCMDS
#include <sys/syslog.h>
-#define BUFSIZE 4000
-
-#if ENABLE_FEATURE_IPV6
-typedef struct sockaddr_in6 sockaddr_type;
-#else
-typedef struct sockaddr_in sockaddr_type;
-#endif
-
#if ENABLE_LOGIN
static const char *loginpath = "/bin/login";
#else
static const char *issuefile = "/etc/issue.net";
-/* shell name and arguments */
-
-static const char *argv_init[2];
-
/* structure that describes a session */
struct tsession {
int rdidx2, wridx2, size2;
};
+/* Two buffers are directly after tsession in malloced memory.
+ * Make whole thing fit in 4k */
+enum { BUFSIZE = (4*1024 - sizeof(struct tsession)) / 2 };
+
/*
This is how the buffers are used. The arrows indicate the movement
of data.
USE_FEATURE_TELNETD_STANDALONE(int sock_r, int sock_w)
SKIP_FEATURE_TELNETD_STANDALONE(void)
) {
+ const char *login_argv[2];
struct termios termbuf;
int fd, pid;
char tty_name[32];
ts->shell_pid = pid;
return ts;
}
-
+
/* child */
+ /* make new session and process group */
+ setsid();
+
/* open the child's side of the tty. */
- fd = xopen(tty_name, O_RDWR /*| O_NOCTTY*/);
+ /* NB: setsid() disconnects from any previous ctty's. Therefore
+ * we must open child's side of the tty AFTER setsid! */
+ fd = xopen(tty_name, O_RDWR); /* becomes our ctty */
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
while (fd > 2) close(fd--);
- /* make new process group */
- setsid();
- tcsetpgrp(0, getpid());
+ tcsetpgrp(0, getpid()); /* switch this tty's process group to us */
/* The pseudo-terminal allocated to the client is configured to operate in
* cooked mode, and with XTABS CRMOD enabled (see tty(4)). */
print_login_issue(issuefile, NULL);
- /* exec shell, with correct argv and env */
- execv(loginpath, (char *const *)argv_init);
- bb_perror_msg_and_die("execv");
+ /* exec shell / login /whatever */
+ login_argv[0] = loginpath;
+ login_argv[1] = NULL;
+ execv(loginpath, (char **)login_argv);
+ /* Hmmm... this gets sent to the client thru fd#2! Is it ok?? */
+ bb_perror_msg_and_die("execv %s", loginpath);
}
#if ENABLE_FEATURE_TELNETD_STANDALONE
free(ts);
/* scan all sessions and find new maxfd */
- ts = sessions;
+ ts = sessions;
maxfd = 0;
while (ts) {
if (maxfd < ts->ptyfd)
}
}
-static int
-dotted2sockaddr(const char *dotted, struct sockaddr* sp, int socklen)
-{
- union {
- struct in_addr a4;
-#if ENABLE_FEATURE_IPV6
- struct in6_addr a6;
-#endif
- } a;
-
-#if ENABLE_FEATURE_IPV6
- if (socklen >= sizeof(struct sockaddr_in6)
- && inet_pton(AF_INET6, dotted, &a) > 0
- ) {
- ((struct sockaddr_in6*)sp)->sin6_family = AF_INET6;
- ((struct sockaddr_in6*)sp)->sin6_addr = a.a6;
- } else
-#endif
- if (socklen >= sizeof(struct sockaddr_in)
- && inet_pton(AF_INET, dotted, &a) > 0
- ) {
- ((struct sockaddr_in*)sp)->sin_family = AF_INET;
- ((struct sockaddr_in*)sp)->sin_addr = a.a4;
- } else
- return 1;
-
- return 0; /* success */
-}
-
-static int
-xsocket_stream_ip4or6(sa_family_t *fp)
-{
- int fd = socket(AF_INET6, SOCK_STREAM, 0);
- if (fp) *fp = AF_INET6;
- if (fd < 0) {
- fd = xsocket(AF_INET, SOCK_STREAM, 0);
- if (fp) *fp = AF_INET;
- }
- return fd;
-}
-
-static int
-create_socket(const char *hostaddr, int port)
-{
- static const int on = 1;
- int fd;
- union {
- struct sockaddr sa;
- struct sockaddr_in sin;
-#if ENABLE_FEATURE_IPV6
- struct sockaddr_in6 sin6;
-#endif
- } sa;
-
- memset(&sa, 0, sizeof(sa));
- if (hostaddr && dotted2sockaddr(hostaddr, &sa.sa, sizeof(sa)))
- bb_show_usage();
-
- if (!sa.sa.sa_family)
- fd = xsocket_stream_ip4or6(&sa.sa.sa_family);
- else /* user specified -b ADDR dictates family */
- fd = xsocket(sa.sa.sa_family, SOCK_STREAM, 0);
- setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
-
-#if ENABLE_FEATURE_IPV6
- if (sa.sa.sa_family == AF_INET6)
- sa.sin6.sin6_port = htons(port);
-#endif
- if (sa.sa.sa_family == AF_INET)
- sa.sin.sin_port = htons(port);
-
- xbind(fd, &sa.sa, sizeof(sa));
- xlisten(fd, 1);
- return fd;
-}
-
#else /* !FEATURE_TELNETD_STANDALONE */
/* Never actually called */
void free_session(struct tsession *ts);
-int create_socket(const char *hostaddr, int port);
#endif
-int
-telnetd_main(int argc, char **argv)
+int telnetd_main(int argc, char **argv);
+int telnetd_main(int argc, char **argv)
{
fd_set rdfdset, wrfdset;
unsigned opt;
OPT_INETD = 0x20 * ENABLE_FEATURE_TELNETD_STANDALONE,
};
- opt = getopt32(argc, argv, "f:l:" USE_FEATURE_TELNETD_STANDALONE("p:b:Fi"),
+ opt = getopt32(argv, "f:l:" USE_FEATURE_TELNETD_STANDALONE("p:b:Fi"),
&issuefile, &loginpath
USE_FEATURE_TELNETD_STANDALONE(, &opt_portnbr, &opt_bindaddr));
/* Redirect log to syslog early, if needed */
/* Used to check access(loginpath, X_OK) here. Pointless.
* exec will do this for us for free later. */
- argv_init[0] = loginpath;
#if ENABLE_FEATURE_TELNETD_STANDALONE
if (IS_INETD) {
sessions = make_new_session(0, 1);
} else {
- master_fd = create_socket(opt_bindaddr, portnbr);
+ master_fd = create_and_bind_stream_or_die(opt_bindaddr, portnbr);
+ xlisten(master_fd, 1);
if (!(opt & OPT_FOREGROUND))
- xdaemon(0, 0);
+ bb_daemonize(DAEMON_CHDIR_ROOT);
}
#else
sessions = make_new_session();
#if ENABLE_FEATURE_TELNETD_STANDALONE
/* First check for and accept new sessions. */
if (!IS_INETD && FD_ISSET(master_fd, &rdfdset)) {
- sockaddr_type sa;
int fd;
- socklen_t salen;
struct tsession *new_ts;
- salen = sizeof(sa);
- fd = accept(master_fd, (struct sockaddr *)&sa, &salen);
+ fd = accept(master_fd, NULL, 0);
if (fd < 0)
goto again;
/* Create a new session and link it into our active list */
projects / oweals / busybox.git / blobdiff