-/* $Id: telnetd.c,v 1.13 2004/09/14 17:24:58 bug1 Exp $
- *
+/* vi: set sw=4 ts=4: */
+/*
* Simple telnet server
* Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
*
- * This file is distributed under the Gnu Public License (GPL),
- * please see the file LICENSE for further information.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* ---------------------------------------------------------------------------
* (C) Copyright 2000, Axis Communications AB, LUND, SWEDEN
*/
/*#define DEBUG 1 */
+#define DEBUG 0
+
+#include "busybox.h"
-#include <sys/time.h>
-#include <sys/socket.h>
-#include <sys/wait.h>
-#include <sys/ioctl.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <signal.h>
-#include <termios.h>
-#ifdef DEBUG
+#if DEBUG
#define TELCMDS
#define TELOPTS
#endif
#include <arpa/telnet.h>
-#include <ctype.h>
#include <sys/syslog.h>
-#include "busybox.h"
#define BUFSIZE 4000
-#ifdef CONFIG_FEATURE_IPV6
-#define SOCKET_TYPE AF_INET6
+#if ENABLE_FEATURE_IPV6
typedef struct sockaddr_in6 sockaddr_type;
#else
-#define SOCKET_TYPE AF_INET
typedef struct sockaddr_in sockaddr_type;
#endif
-
-#ifdef CONFIG_LOGIN
+#if ENABLE_LOGIN
static const char *loginpath = "/bin/login";
#else
-static const char *loginpath;
+static const char *loginpath = DEFAULT_SHELL;
#endif
+
static const char *issuefile = "/etc/issue.net";
/* shell name and arguments */
-static const char *argv_init[] = {NULL, NULL};
+static const char *argv_init[2];
/* structure that describes a session */
struct tsession {
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- int sockfd_read, sockfd_write, ptyfd;
-#else /* CONFIG_FEATURE_TELNETD_INETD */
struct tsession *next;
- int sockfd, ptyfd;
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
+ int sockfd_read, sockfd_write, ptyfd;
int shell_pid;
/* two circular buffers */
char *buf1, *buf2;
};
/*
-
This is how the buffers are used. The arrows indicate the movement
of data.
+-------+ wridx1++ +------+ rdidx1++ +----------+
| | <-------------- | buf1 | <-------------- | |
| | size1-- +------+ size1++ | |
- | pty | | socket |
+ | pty | | socket |
| | rdidx2++ +------+ wridx2++ | |
| | --------------> | buf2 | --------------> | |
+-------+ size2++ +------+ size2-- +----------+
Each session has got two buffers.
-
*/
static int maxfd;
/*
-
- Remove all IAC's from the buffer pointed to by bf (recieved IACs are ignored
+ Remove all IAC's from the buffer pointed to by bf (received IACs are ignored
and must be removed so as to not be interpreted by the terminal). Make an
uninterrupted string of characters fit for the terminal. Do this by packing
all characters meant for the terminal sequentially towards the end of bf.
what is the escape character? We aren't handling that situation here.
CR-LF ->'s CR mapping is also done here, for convenience
-
- */
+ */
static char *
-remove_iacs(struct tsession *ts, int *pnum_totty) {
+remove_iacs(struct tsession *ts, int *pnum_totty)
+{
unsigned char *ptr0 = (unsigned char *)ts->buf1 + ts->wridx1;
unsigned char *ptr = ptr0;
unsigned char *totty = ptr;
*/
if (c == '\r' && (*ptr == '\n' || *ptr == 0) && ptr < end)
ptr++;
- }
- else {
+ } else {
/*
* TELOPT_NAWS support!
*/
break; /* incomplete, can't process */
ws.ws_col = (ptr[3] << 8) | ptr[4];
ws.ws_row = (ptr[5] << 8) | ptr[6];
- (void) ioctl(ts->ptyfd, TIOCSWINSZ, (char *)&ws);
+ ioctl(ts->ptyfd, TIOCSWINSZ, (char *)&ws);
ptr += 9;
- }
- else {
+ } else {
/* skip 3-byte IAC non-SB cmd */
-#ifdef DEBUG
+#if DEBUG
fprintf(stderr, "Ignoring IAC %s,%s\n",
- TELCMD(*(ptr+1)), TELOPT(*(ptr+2)));
+ TELCMD(ptr[1]), TELOPT(ptr[2]));
#endif
ptr += 3;
}
static int
-getpty(char *line)
+getpty(char *line, int size)
{
int p;
-#ifdef CONFIG_FEATURE_DEVPTS
- p = open("/dev/ptmx", 2);
+#if ENABLE_FEATURE_DEVPTS
+ p = open("/dev/ptmx", O_RDWR);
if (p > 0) {
+ const char *name;
grantpt(p);
unlockpt(p);
- strcpy(line, ptsname(p));
- return(p);
+ name = ptsname(p);
+ if (!name) {
+ bb_perror_msg("ptsname error (is /dev/pts mounted?)");
+ return -1;
+ }
+ safe_strncpy(line, name, size);
+ return p;
}
#else
struct stat stb;
}
for (j = 0; j < 16; j++) {
line[9] = j < 10 ? j + '0' : j - 10 + 'a';
- if ((p = open(line, O_RDWR | O_NOCTTY)) >= 0) {
+ if (DEBUG)
+ fprintf(stderr, "Trying to open device: %s\n", line);
+ p = open(line, O_RDWR | O_NOCTTY);
+ if (p >= 0) {
line[5] = 't';
return p;
}
}
}
-#endif /* CONFIG_FEATURE_DEVPTS */
+#endif /* FEATURE_DEVPTS */
return -1;
}
static void
send_iac(struct tsession *ts, unsigned char command, int option)
{
- /* We rely on that there is space in the buffer for now. */
+ /* We rely on that there is space in the buffer for now. */
char *b = ts->buf2 + ts->rdidx2;
*b++ = IAC;
*b++ = command;
static struct tsession *
-#ifdef CONFIG_FEATURE_TELNETD_INETD
-make_new_session(void)
-#else /* CONFIG_FEATURE_TELNETD_INETD */
-make_new_session(int sockfd)
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-{
+make_new_session(
+ USE_FEATURE_TELNETD_STANDALONE(int sock_r, int sock_w)
+ SKIP_FEATURE_TELNETD_STANDALONE(void)
+) {
struct termios termbuf;
- int pty, pid;
+ int fd, pid;
char tty_name[32];
- struct tsession *ts = malloc(sizeof(struct tsession) + BUFSIZE * 2);
+ struct tsession *ts = xzalloc(sizeof(struct tsession) + BUFSIZE * 2);
ts->buf1 = (char *)(&ts[1]);
ts->buf2 = ts->buf1 + BUFSIZE;
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- ts->sockfd_read = 0;
- ts->sockfd_write = 1;
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- ts->sockfd = sockfd;
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-
- ts->rdidx1 = ts->wridx1 = ts->size1 = 0;
- ts->rdidx2 = ts->wridx2 = ts->size2 = 0;
-
- /* Got a new connection, set up a tty and spawn a shell. */
-
- pty = getpty(tty_name);
-
- if (pty < 0) {
- syslog(LOG_ERR, "All network ports in use!");
- return 0;
+ /* Got a new connection, set up a tty. */
+ fd = getpty(tty_name, 32);
+ if (fd < 0) {
+ bb_error_msg("all terminals in use");
+ return NULL;
}
-
- if (pty > maxfd)
- maxfd = pty;
-
- ts->ptyfd = pty;
-
+ if (fd > maxfd) maxfd = fd;
+ ndelay_on(ts->ptyfd = fd);
+#if ENABLE_FEATURE_TELNETD_STANDALONE
+ if (sock_w > maxfd) maxfd = sock_w;
+ if (sock_r > maxfd) maxfd = sock_r;
+ ndelay_on(ts->sockfd_write = sock_w);
+ ndelay_on(ts->sockfd_read = sock_r);
+#else
+ ts->sockfd_write = 1;
+ /* xzalloc: ts->sockfd_read = 0; */
+ ndelay_on(0);
+ ndelay_on(1);
+#endif
/* Make the telnet client understand we will echo characters so it
* should not do it locally. We don't tell the client to run linemode,
* because we want to handle line editing and tab completion and other
- * stuff that requires char-by-char support.
- */
-
+ * stuff that requires char-by-char support. */
send_iac(ts, DO, TELOPT_ECHO);
send_iac(ts, DO, TELOPT_NAWS);
send_iac(ts, DO, TELOPT_LFLOW);
send_iac(ts, WILL, TELOPT_ECHO);
send_iac(ts, WILL, TELOPT_SGA);
-
- if ((pid = fork()) < 0) {
- syslog(LOG_ERR, "Can`t forking");
+ pid = fork();
+ if (pid < 0) {
+ free(ts);
+ close(fd);
+ bb_perror_msg("fork");
+ return NULL;
}
- if (pid == 0) {
- /* In child, open the child's side of the tty. */
- int i;
-
- for(i = 0; i <= maxfd; i++)
- close(i);
- /* make new process group */
- setsid();
-
- if (open(tty_name, O_RDWR /*| O_NOCTTY*/) < 0) {
- syslog(LOG_ERR, "Could not open tty");
- exit(1);
- }
- dup(0);
- dup(0);
-
- tcsetpgrp(0, getpid());
-
- /* The pseudo-terminal allocated to the client is configured to operate in
- * cooked mode, and with XTABS CRMOD enabled (see tty(4)).
- */
-
- tcgetattr(0, &termbuf);
- termbuf.c_lflag |= ECHO; /* if we use readline we dont want this */
- termbuf.c_oflag |= ONLCR|XTABS;
- termbuf.c_iflag |= ICRNL;
- termbuf.c_iflag &= ~IXOFF;
- /*termbuf.c_lflag &= ~ICANON;*/
- tcsetattr(0, TCSANOW, &termbuf);
-
- print_login_issue(issuefile, NULL);
-
- /* exec shell, with correct argv and env */
- execv(loginpath, (char *const *)argv_init);
-
- /* NOT REACHED */
- syslog(LOG_ERR, "execv error");
- exit(1);
+ if (pid > 0) {
+ /* parent */
+ ts->shell_pid = pid;
+ return ts;
}
-
- ts->shell_pid = pid;
-
- return ts;
+
+ /* child */
+
+ /* open the child's side of the tty. */
+ fd = xopen(tty_name, O_RDWR /*| O_NOCTTY*/);
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ while (fd > 2) close(fd--);
+ /* make new process group */
+ setsid();
+ tcsetpgrp(0, getpid());
+
+ /* The pseudo-terminal allocated to the client is configured to operate in
+ * cooked mode, and with XTABS CRMOD enabled (see tty(4)). */
+ tcgetattr(0, &termbuf);
+ termbuf.c_lflag |= ECHO; /* if we use readline we dont want this */
+ termbuf.c_oflag |= ONLCR|XTABS;
+ termbuf.c_iflag |= ICRNL;
+ termbuf.c_iflag &= ~IXOFF;
+ /*termbuf.c_lflag &= ~ICANON;*/
+ tcsetattr(0, TCSANOW, &termbuf);
+
+ print_login_issue(issuefile, NULL);
+
+ /* exec shell, with correct argv and env */
+ execv(loginpath, (char *const *)argv_init);
+ bb_perror_msg_and_die("execv");
}
-#ifndef CONFIG_FEATURE_TELNETD_INETD
+#if ENABLE_FEATURE_TELNETD_STANDALONE
+
static void
free_session(struct tsession *ts)
{
struct tsession *t = sessions;
- /* Unlink this telnet session from the session list. */
- if(t == ts)
+ /* unlink this telnet session from the session list */
+ if (t == ts)
sessions = ts->next;
else {
- while(t->next != ts)
+ while (t->next != ts)
t = t->next;
t->next = ts->next;
}
kill(ts->shell_pid, SIGKILL);
-
wait4(ts->shell_pid, NULL, 0, NULL);
-
close(ts->ptyfd);
- close(ts->sockfd);
-
- if(ts->ptyfd == maxfd || ts->sockfd == maxfd)
- maxfd--;
- if(ts->ptyfd == maxfd || ts->sockfd == maxfd)
- maxfd--;
-
+ close(ts->sockfd_read);
+ /* error if ts->sockfd_read == ts->sockfd_write. So what? ;) */
+ close(ts->sockfd_write);
free(ts);
+
+ /* scan all sessions and find new maxfd */
+ ts = sessions;
+ maxfd = 0;
+ while (ts) {
+ if (maxfd < ts->ptyfd)
+ maxfd = ts->ptyfd;
+ if (maxfd < ts->sockfd_read)
+ maxfd = ts->sockfd_read;
+ if (maxfd < ts->sockfd_write)
+ maxfd = ts->sockfd_write;
+ ts = ts->next;
+ }
}
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
+
+#else /* !FEATURE_TELNETD_STANDALONE */
+
+/* Never actually called */
+void free_session(struct tsession *ts);
+
+#endif
+
int
telnetd_main(int argc, char **argv)
{
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- sockaddr_type sa;
- int master_fd;
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
fd_set rdfdset, wrfdset;
- int selret;
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- int on = 1;
- int portnbr = 23;
- struct in_addr bind_addr = { .s_addr = 0x0 };
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- int c;
- static const char options[] =
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- "f:l:";
-#else /* CONFIG_EATURE_TELNETD_INETD */
- "f:l:p:b:";
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- int maxlen, w, r;
-
-#ifndef CONFIG_LOGIN
- loginpath = DEFAULT_SHELL;
+ unsigned opt;
+ int selret, maxlen, w, r;
+ struct tsession *ts;
+#if ENABLE_FEATURE_TELNETD_STANDALONE
+#define IS_INETD (opt & OPT_INETD)
+ int master_fd = -1; /* be happy, gcc */
+ unsigned portnbr = 23;
+ char *opt_bindaddr = NULL;
+ char *opt_portnbr;
+#else
+ enum {
+ IS_INETD = 1,
+ master_fd = -1,
+ portnbr = 23,
+ };
#endif
-
- for (;;) {
- c = getopt( argc, argv, options);
- if (c == EOF) break;
- switch (c) {
- case 'f':
- issuefile = optarg;
- break;
- case 'l':
- loginpath = optarg;
- break;
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- case 'p':
- portnbr = atoi(optarg);
- break;
- case 'b':
- if (inet_aton(optarg, &bind_addr) == 0)
- bb_show_usage();
- break;
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- default:
- bb_show_usage();
- }
+ enum {
+ OPT_PORT = 4 * ENABLE_FEATURE_TELNETD_STANDALONE,
+ OPT_FOREGROUND = 0x10 * ENABLE_FEATURE_TELNETD_STANDALONE,
+ OPT_INETD = 0x20 * ENABLE_FEATURE_TELNETD_STANDALONE,
+ };
+
+ opt = getopt32(argc, 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 */
+ if (IS_INETD || !(opt & OPT_FOREGROUND)) {
+ openlog(applet_name, 0, LOG_USER);
+ logmode = LOGMODE_SYSLOG;
}
-
- if (access(loginpath, X_OK) < 0) {
- bb_error_msg_and_die ("'%s' unavailable.", loginpath);
- }
-
+ //if (opt & 1) // -f
+ //if (opt & 2) // -l
+ USE_FEATURE_TELNETD_STANDALONE(
+ if (opt & OPT_PORT) // -p
+ portnbr = xatou16(opt_portnbr);
+ //if (opt & 8) // -b
+ //if (opt & 0x10) // -F
+ //if (opt & 0x20) // -i
+ );
+
+ /* Used to check access(loginpath, X_OK) here. Pointless.
+ * exec will do this for us for free later. */
argv_init[0] = loginpath;
- openlog(bb_applet_name, 0, LOG_USER);
-
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- maxfd = 1;
- sessions = make_new_session();
-#else /* CONFIG_EATURE_TELNETD_INETD */
- sessions = 0;
-
- /* Grab a TCP socket. */
-
- master_fd = socket(SOCKET_TYPE, SOCK_STREAM, 0);
- if (master_fd < 0) {
- bb_perror_msg_and_die("socket");
+#if ENABLE_FEATURE_TELNETD_STANDALONE
+ if (IS_INETD) {
+ sessions = make_new_session(0, 1);
+ } else {
+ master_fd = create_and_bind_socket_ip4or6(opt_bindaddr, portnbr);
+ xlisten(master_fd, 1);
+ if (!(opt & OPT_FOREGROUND))
+ xdaemon(0, 0);
}
- (void)setsockopt(master_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
-
- /* Set it to listen to specified port. */
-
- memset((void *)&sa, 0, sizeof(sa));
-#ifdef CONFIG_FEATURE_IPV6
- sa.sin6_family = AF_INET6;
- sa.sin6_port = htons(portnbr);
- /* sa.sin6_addr = bind_addr6; */
#else
- sa.sin_family = AF_INET;
- sa.sin_port = htons(portnbr);
- sa.sin_addr = bind_addr;
+ sessions = make_new_session();
#endif
- if (bind(master_fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
- bb_perror_msg_and_die("bind");
- }
+ /* We don't want to die if just one session is broken */
+ signal(SIGPIPE, SIG_IGN);
- if (listen(master_fd, 1) < 0) {
- bb_perror_msg_and_die("listen");
+ again:
+ FD_ZERO(&rdfdset);
+ FD_ZERO(&wrfdset);
+ if (!IS_INETD) {
+ FD_SET(master_fd, &rdfdset);
+ /* This is needed because free_session() does not
+ * take into account master_fd when it finds new
+ * maxfd among remaining fd's: */
+ if (master_fd > maxfd)
+ maxfd = master_fd;
}
- if (daemon(0, 0) < 0)
- bb_perror_msg_and_die("daemon");
-
-
- maxfd = master_fd;
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-
- do {
- struct tsession *ts;
-
- FD_ZERO(&rdfdset);
- FD_ZERO(&wrfdset);
+ /* select on the master socket, all telnet sockets and their
+ * ptys if there is room in their session buffers. */
+ ts = sessions;
+ while (ts) {
+ /* buf1 is used from socket to pty
+ * buf2 is used from pty to socket */
+ if (ts->size1 > 0) /* can write to pty */
+ FD_SET(ts->ptyfd, &wrfdset);
+ if (ts->size1 < BUFSIZE) /* can read from socket */
+ FD_SET(ts->sockfd_read, &rdfdset);
+ if (ts->size2 > 0) /* can write to socket */
+ FD_SET(ts->sockfd_write, &wrfdset);
+ if (ts->size2 < BUFSIZE) /* can read from pty */
+ FD_SET(ts->ptyfd, &rdfdset);
+ ts = ts->next;
+ }
- /* select on the master socket, all telnet sockets and their
- * ptys if there is room in their respective session buffers.
- */
+ selret = select(maxfd + 1, &rdfdset, &wrfdset, 0, 0);
+ if (!selret)
+ return 0;
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- FD_SET(master_fd, &rdfdset);
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-
- ts = sessions;
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- while (ts) {
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- /* buf1 is used from socket to pty
- * buf2 is used from pty to socket
- */
- if (ts->size1 > 0) {
- FD_SET(ts->ptyfd, &wrfdset); /* can write to pty */
- }
- if (ts->size1 < BUFSIZE) {
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- FD_SET(ts->sockfd_read, &rdfdset); /* can read from socket */
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- FD_SET(ts->sockfd, &rdfdset); /* can read from socket */
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- }
- if (ts->size2 > 0) {
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- FD_SET(ts->sockfd_write, &wrfdset); /* can write to socket */
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- FD_SET(ts->sockfd, &wrfdset); /* can write to socket */
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- }
- if (ts->size2 < BUFSIZE) {
- FD_SET(ts->ptyfd, &rdfdset); /* can read from pty */
- }
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- ts = ts->next;
+#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);
+ if (fd < 0)
+ goto again;
+ /* Create a new session and link it into our active list */
+ new_ts = make_new_session(fd, fd);
+ if (new_ts) {
+ new_ts->next = sessions;
+ sessions = new_ts;
+ } else {
+ close(fd);
}
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-
- selret = select(maxfd + 1, &rdfdset, &wrfdset, 0, 0);
-
- if (!selret)
- break;
-
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- /* First check for and accept new sessions. */
- if (FD_ISSET(master_fd, &rdfdset)) {
- int fd, salen;
+ }
+#endif
- salen = sizeof(sa);
- if ((fd = accept(master_fd, (struct sockaddr *)&sa,
- &salen)) < 0) {
+ /* Then check for data tunneling. */
+ ts = sessions;
+ while (ts) { /* For all sessions... */
+ struct tsession *next = ts->next; /* in case we free ts. */
+
+ if (ts->size1 && FD_ISSET(ts->ptyfd, &wrfdset)) {
+ int num_totty;
+ char *ptr;
+ /* Write to pty from buffer 1. */
+ ptr = remove_iacs(ts, &num_totty);
+ w = safe_write(ts->ptyfd, ptr, num_totty);
+ /* needed? if (w < 0 && errno == EAGAIN) continue; */
+ if (w < 0) {
+ if (IS_INETD)
+ return 0;
+ free_session(ts);
+ ts = next;
continue;
- } else {
- /* Create a new session and link it into
- our active list. */
- struct tsession *new_ts = make_new_session(fd);
- if (new_ts) {
- new_ts->next = sessions;
- sessions = new_ts;
- if (fd > maxfd)
- maxfd = fd;
- } else {
- close(fd);
- }
}
+ ts->wridx1 += w;
+ ts->size1 -= w;
+ if (ts->wridx1 == BUFSIZE)
+ ts->wridx1 = 0;
}
- /* Then check for data tunneling. */
-
- ts = sessions;
- while (ts) { /* For all sessions... */
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- struct tsession *next = ts->next; /* in case we free ts. */
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-
- if (ts->size1 && FD_ISSET(ts->ptyfd, &wrfdset)) {
- int num_totty;
- char *ptr;
- /* Write to pty from buffer 1. */
-
- ptr = remove_iacs(ts, &num_totty);
-
- w = write(ts->ptyfd, ptr, num_totty);
- if (w < 0) {
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- exit(0);
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- free_session(ts);
- ts = next;
- continue;
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- }
- ts->wridx1 += w;
- ts->size1 -= w;
- if (ts->wridx1 == BUFSIZE)
- ts->wridx1 = 0;
- }
-
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- if (ts->size2 && FD_ISSET(ts->sockfd_write, &wrfdset)) {
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- if (ts->size2 && FD_ISSET(ts->sockfd, &wrfdset)) {
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- /* Write to socket from buffer 2. */
- maxlen = MIN(BUFSIZE - ts->wridx2, ts->size2);
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- w = write(ts->sockfd_write, ts->buf2 + ts->wridx2, maxlen);
- if (w < 0)
- exit(0);
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- w = write(ts->sockfd, ts->buf2 + ts->wridx2, maxlen);
- if (w < 0) {
- free_session(ts);
- ts = next;
- continue;
- }
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- ts->wridx2 += w;
- ts->size2 -= w;
- if (ts->wridx2 == BUFSIZE)
- ts->wridx2 = 0;
+ if (ts->size2 && FD_ISSET(ts->sockfd_write, &wrfdset)) {
+ /* Write to socket from buffer 2. */
+ maxlen = MIN(BUFSIZE - ts->wridx2, ts->size2);
+ w = safe_write(ts->sockfd_write, ts->buf2 + ts->wridx2, maxlen);
+ /* needed? if (w < 0 && errno == EAGAIN) continue; */
+ if (w < 0) {
+ if (IS_INETD)
+ return 0;
+ free_session(ts);
+ ts = next;
+ continue;
}
+ ts->wridx2 += w;
+ ts->size2 -= w;
+ if (ts->wridx2 == BUFSIZE)
+ ts->wridx2 = 0;
+ }
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- if (ts->size1 < BUFSIZE && FD_ISSET(ts->sockfd_read, &rdfdset)) {
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- if (ts->size1 < BUFSIZE && FD_ISSET(ts->sockfd, &rdfdset)) {
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- /* Read from socket to buffer 1. */
- maxlen = MIN(BUFSIZE - ts->rdidx1,
- BUFSIZE - ts->size1);
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- r = read(ts->sockfd_read, ts->buf1 + ts->rdidx1, maxlen);
- if (!r || (r < 0 && errno != EINTR))
- exit(0);
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- r = read(ts->sockfd, ts->buf1 + ts->rdidx1, maxlen);
- if (!r || (r < 0 && errno != EINTR)) {
- free_session(ts);
- ts = next;
- continue;
- }
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- if(!*(ts->buf1 + ts->rdidx1 + r - 1)) {
- r--;
- if(!r)
- continue;
- }
- ts->rdidx1 += r;
- ts->size1 += r;
- if (ts->rdidx1 == BUFSIZE)
- ts->rdidx1 = 0;
+ if (ts->size1 < BUFSIZE && FD_ISSET(ts->sockfd_read, &rdfdset)) {
+ /* Read from socket to buffer 1. */
+ maxlen = MIN(BUFSIZE - ts->rdidx1, BUFSIZE - ts->size1);
+ r = safe_read(ts->sockfd_read, ts->buf1 + ts->rdidx1, maxlen);
+ if (r < 0 && errno == EAGAIN) continue;
+ if (r <= 0) {
+ if (IS_INETD)
+ return 0;
+ free_session(ts);
+ ts = next;
+ continue;
}
-
- if (ts->size2 < BUFSIZE && FD_ISSET(ts->ptyfd, &rdfdset)) {
- /* Read from pty to buffer 2. */
- maxlen = MIN(BUFSIZE - ts->rdidx2,
- BUFSIZE - ts->size2);
- r = read(ts->ptyfd, ts->buf2 + ts->rdidx2, maxlen);
- if (!r || (r < 0 && errno != EINTR)) {
-#ifdef CONFIG_FEATURE_TELNETD_INETD
- exit(0);
-#else /* CONFIG_FEATURE_TELNETD_INETD */
- free_session(ts);
- ts = next;
+ if (!ts->buf1[ts->rdidx1 + r - 1])
+ if (!--r)
continue;
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
- }
- ts->rdidx2 += r;
- ts->size2 += r;
- if (ts->rdidx2 == BUFSIZE)
- ts->rdidx2 = 0;
- }
-
- if (ts->size1 == 0) {
+ ts->rdidx1 += r;
+ ts->size1 += r;
+ if (ts->rdidx1 == BUFSIZE)
ts->rdidx1 = 0;
- ts->wridx1 = 0;
+ }
+
+ if (ts->size2 < BUFSIZE && FD_ISSET(ts->ptyfd, &rdfdset)) {
+ /* Read from pty to buffer 2. */
+ maxlen = MIN(BUFSIZE - ts->rdidx2, BUFSIZE - ts->size2);
+ r = safe_read(ts->ptyfd, ts->buf2 + ts->rdidx2, maxlen);
+ if (r < 0 && errno == EAGAIN) continue;
+ if (r <= 0) {
+ if (IS_INETD)
+ return 0;
+ free_session(ts);
+ ts = next;
+ continue;
}
- if (ts->size2 == 0) {
+ ts->rdidx2 += r;
+ ts->size2 += r;
+ if (ts->rdidx2 == BUFSIZE)
ts->rdidx2 = 0;
- ts->wridx2 = 0;
- }
-#ifndef CONFIG_FEATURE_TELNETD_INETD
- ts = next;
}
-#endif /* CONFIG_FEATURE_TELNETD_INETD */
-
- } while (1);
- return 0;
+ if (ts->size1 == 0) {
+ ts->rdidx1 = 0;
+ ts->wridx1 = 0;
+ }
+ if (ts->size2 == 0) {
+ ts->rdidx2 = 0;
+ ts->wridx2 = 0;
+ }
+ ts = next;
+ }
+ goto again;
}
projects / oweals / busybox.git / blobdiff