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telnetd: some simplifications and better error hadling.
telnetd: don't SIGKILL child when closing the session. kernel will seng SIGHUP for us. static.iacs_to_send - 15 +15 .rodata 123418 123429 +11 make_new_session 549 525 -24 send_iac 26 - -26 free_session 144 118 -26 telnetd_main 1303 1261 -42 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 1/3 up/down: 26/-118) Total: -92 bytes text data bss dec hex filename 676341 2538 12104 690983 a8b27 busybox_old 676234 2538 12104 690876 a8abc busybox_unstripped
This commit is contained in:
Denis Vlasenko
parent
d898b8600c
commit
59d7c43dbe
@ -33,63 +33,51 @@
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#include <sys/syslog.h>
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#if ENABLE_LOGIN
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static const char *loginpath = "/bin/login";
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#else
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static const char *loginpath = DEFAULT_SHELL;
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#endif
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static const char *issuefile = "/etc/issue.net";
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/* structure that describes a session */
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/* Structure that describes a session */
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struct tsession {
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struct tsession *next;
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int sockfd_read, sockfd_write, ptyfd;
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int shell_pid;
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/*int shell_pid;*/
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/* two circular buffers */
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char *buf1, *buf2;
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/*char *buf1, *buf2;*/
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/*#define TS_BUF1 ts->buf1*/
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/*#define TS_BUF2 TS_BUF2*/
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#define TS_BUF1 ((char*)(ts + 1))
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#define TS_BUF2 (((char*)(ts + 1)) + BUFSIZE)
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int rdidx1, wridx1, size1;
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int rdidx2, wridx2, size2;
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};
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/* Two buffers are directly after tsession in malloced memory.
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* Make whole thing fit in 4k */
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enum { BUFSIZE = (4*1024 - sizeof(struct tsession)) / 2 };
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enum { BUFSIZE = (4 * 1024 - sizeof(struct tsession)) / 2 };
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/*
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This is how the buffers are used. The arrows indicate the movement
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of data.
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+-------+ wridx1++ +------+ rdidx1++ +----------+
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| | <-------------- | buf1 | <-------------- | |
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| | size1-- +------+ size1++ | |
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| pty | | socket |
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| | rdidx2++ +------+ wridx2++ | |
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| | --------------> | buf2 | --------------> | |
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+-------+ size2++ +------+ size2-- +----------+
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Each session has got two buffers.
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*/
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/* Globals */
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static int maxfd;
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static struct tsession *sessions;
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#if ENABLE_LOGIN
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static const char *loginpath = "/bin/login";
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#else
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static const char *loginpath = DEFAULT_SHELL;
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#endif
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static const char *issuefile = "/etc/issue.net";
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/*
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Remove all IAC's from the buffer pointed to by bf (received IACs are ignored
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and must be removed so as to not be interpreted by the terminal). Make an
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uninterrupted string of characters fit for the terminal. Do this by packing
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all characters meant for the terminal sequentially towards the end of bf.
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Remove all IAC's from buf1 (received IACs are ignored and must be removed
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so as to not be interpreted by the terminal). Make an uninterrupted
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string of characters fit for the terminal. Do this by packing
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all characters meant for the terminal sequentially towards the end of buf.
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Return a pointer to the beginning of the characters meant for the terminal.
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and make *num_totty the number of characters that should be sent to
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the terminal.
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Note - If an IAC (3 byte quantity) starts before (bf + len) but extends
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past (bf + len) then that IAC will be left unprocessed and *processed will be
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less than len.
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past (bf + len) then that IAC will be left unprocessed and *processed
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will be less than len.
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FIXME - if we mean to send 0xFF to the terminal then it will be escaped,
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what is the escape character? We aren't handling that situation here.
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@ -99,7 +87,7 @@ static struct tsession *sessions;
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static char *
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remove_iacs(struct tsession *ts, int *pnum_totty)
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{
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unsigned char *ptr0 = (unsigned char *)ts->buf1 + ts->wridx1;
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unsigned char *ptr0 = (unsigned char *)TS_BUF1 + ts->wridx1;
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unsigned char *ptr = ptr0;
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unsigned char *totty = ptr;
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unsigned char *end = ptr + MIN(BUFSIZE - ts->wridx1, ts->size1);
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@ -210,19 +198,6 @@ getpty(char *line, int size)
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}
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static void
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send_iac(struct tsession *ts, unsigned char command, int option)
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{
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/* We rely on that there is space in the buffer for now. */
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char *b = ts->buf2 + ts->rdidx2;
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*b++ = IAC;
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*b++ = command;
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*b++ = option;
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ts->rdidx2 += 3;
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ts->size2 += 3;
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}
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static struct tsession *
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make_new_session(
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USE_FEATURE_TELNETD_STANDALONE(int sock_r, int sock_w)
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@ -234,25 +209,28 @@ make_new_session(
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char tty_name[32];
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struct tsession *ts = xzalloc(sizeof(struct tsession) + BUFSIZE * 2);
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ts->buf1 = (char *)(&ts[1]);
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ts->buf2 = ts->buf1 + BUFSIZE;
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/*ts->buf1 = (char *)(ts + 1);*/
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/*ts->buf2 = ts->buf1 + BUFSIZE;*/
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/* Got a new connection, set up a tty. */
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fd = getpty(tty_name, 32);
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if (fd < 0) {
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bb_error_msg("all terminals in use");
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bb_error_msg("can't create pty");
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return NULL;
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}
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if (fd > maxfd) maxfd = fd;
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ndelay_on(ts->ptyfd = fd);
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ts->ptyfd = fd;
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ndelay_on(fd);
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#if ENABLE_FEATURE_TELNETD_STANDALONE
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if (sock_w > maxfd) maxfd = sock_w;
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ts->sockfd_write = sock_w;
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ndelay_on(sock_w);
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if (sock_r > maxfd) maxfd = sock_r;
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ndelay_on(ts->sockfd_write = sock_w);
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ndelay_on(ts->sockfd_read = sock_r);
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ts->sockfd_read = sock_r;
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ndelay_on(sock_r);
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#else
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ts->sockfd_write = 1;
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/* xzalloc: ts->sockfd_read = 0; */
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/* ts->sockfd_read = 0; - done by xzalloc */
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ndelay_on(0);
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ndelay_on(1);
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#endif
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@ -260,26 +238,36 @@ make_new_session(
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* should not do it locally. We don't tell the client to run linemode,
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* because we want to handle line editing and tab completion and other
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* stuff that requires char-by-char support. */
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send_iac(ts, DO, TELOPT_ECHO);
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send_iac(ts, DO, TELOPT_NAWS);
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send_iac(ts, DO, TELOPT_LFLOW);
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send_iac(ts, WILL, TELOPT_ECHO);
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send_iac(ts, WILL, TELOPT_SGA);
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{
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static const char iacs_to_send[] ALIGN1 = {
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IAC, DO, TELOPT_ECHO,
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IAC, DO, TELOPT_NAWS,
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IAC, DO, TELOPT_LFLOW,
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IAC, WILL, TELOPT_ECHO,
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IAC, WILL, TELOPT_SGA
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};
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memcpy(TS_BUF2, iacs_to_send, sizeof(iacs_to_send));
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ts->rdidx2 = sizeof(iacs_to_send);
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ts->size2 = sizeof(iacs_to_send);
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}
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pid = fork();
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fflush(NULL); /* flush all streams */
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pid = vfork(); /* NOMMU-friendly */
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if (pid < 0) {
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free(ts);
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close(fd);
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bb_perror_msg("fork");
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/* sock_r and sock_w will be closed by caller */
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bb_perror_msg("vfork");
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return NULL;
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}
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if (pid > 0) {
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/* parent */
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ts->shell_pid = pid;
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/* Parent */
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/*ts->shell_pid = pid;*/
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return ts;
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}
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/* child */
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/* Child */
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/* Careful - we are after vfork! */
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/* make new session and process group */
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setsid();
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@ -298,20 +286,24 @@ make_new_session(
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* cooked mode, and with XTABS CRMOD enabled (see tty(4)). */
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tcgetattr(0, &termbuf);
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termbuf.c_lflag |= ECHO; /* if we use readline we dont want this */
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termbuf.c_oflag |= ONLCR|XTABS;
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termbuf.c_oflag |= ONLCR | XTABS;
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termbuf.c_iflag |= ICRNL;
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termbuf.c_iflag &= ~IXOFF;
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/*termbuf.c_lflag &= ~ICANON;*/
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tcsetattr(0, TCSANOW, &termbuf);
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/* Uses FILE-based I/O to stdout, but does fflush(stdout),
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* so should be safe with vfork.
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* I fear, though, that some users will have ridiculously big
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* issue files, and they may block writing to fd 1. */
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print_login_issue(issuefile, NULL);
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/* exec shell / login /whatever */
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/* Exec shell / login / whatever */
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login_argv[0] = loginpath;
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login_argv[1] = NULL;
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execv(loginpath, (char **)login_argv);
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/* Hmmm... this gets sent to the client thru fd#2! Is it ok?? */
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bb_perror_msg_and_die("execv %s", loginpath);
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execvp(loginpath, (char **)login_argv);
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/* Safer with vfork, and we shouldn't send this to the client anyway */
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_exit(1); /*bb_perror_msg_and_die("execv %s", loginpath);*/
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}
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#if ENABLE_FEATURE_TELNETD_STANDALONE
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@ -321,7 +313,7 @@ free_session(struct tsession *ts)
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{
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struct tsession *t = sessions;
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/* unlink this telnet session from the session list */
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/* Unlink this telnet session from the session list */
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if (t == ts)
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sessions = ts->next;
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else {
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@ -330,15 +322,18 @@ free_session(struct tsession *ts)
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t->next = ts->next;
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}
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kill(ts->shell_pid, SIGKILL);
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wait4(ts->shell_pid, NULL, 0, NULL);
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/* It was said that "normal" telnetd just closes ptyfd,
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* doesn't send SIGKILL. When we close ptyfd,
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* kernel sends SIGHUP to processes having slave side opened. */
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/*kill(ts->shell_pid, SIGKILL);
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wait4(ts->shell_pid, NULL, 0, NULL);*/
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close(ts->ptyfd);
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close(ts->sockfd_read);
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/* error if ts->sockfd_read == ts->sockfd_write. So what? ;) */
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close(ts->sockfd_write);
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free(ts);
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/* scan all sessions and find new maxfd */
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/* Scan all sessions and find new maxfd */
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ts = sessions;
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maxfd = 0;
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while (ts) {
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@ -369,7 +364,7 @@ int telnetd_main(int argc, char **argv)
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struct tsession *ts;
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#if ENABLE_FEATURE_TELNETD_STANDALONE
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#define IS_INETD (opt & OPT_INETD)
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int master_fd = -1; /* be happy, gcc */
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int master_fd = master_fd; /* be happy, gcc */
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unsigned portnbr = 23;
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char *opt_bindaddr = NULL;
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char *opt_portnbr;
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@ -381,12 +376,14 @@ int telnetd_main(int argc, char **argv)
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};
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#endif
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enum {
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OPT_PORT = 4 * ENABLE_FEATURE_TELNETD_STANDALONE,
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OPT_FOREGROUND = 0x10 * ENABLE_FEATURE_TELNETD_STANDALONE,
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OPT_INETD = 0x20 * ENABLE_FEATURE_TELNETD_STANDALONE,
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OPT_INETD = (1 << 2) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -i */
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OPT_PORT = (1 << 3) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -p */
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OPT_FOREGROUND = (1 << 5) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -F */
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};
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opt = getopt32(argv, "f:l:" USE_FEATURE_TELNETD_STANDALONE("p:b:Fi"),
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/* If !STANDALONE, we accept (and ignore) -i, thus people
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* don't need to guess whether it's ok to pass -i to us */
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opt = getopt32(argv, "f:l:i" USE_FEATURE_TELNETD_STANDALONE("p:b:F"),
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&issuefile, &loginpath
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USE_FEATURE_TELNETD_STANDALONE(, &opt_portnbr, &opt_bindaddr));
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/* Redirect log to syslog early, if needed */
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@ -410,19 +407,43 @@ int telnetd_main(int argc, char **argv)
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#if ENABLE_FEATURE_TELNETD_STANDALONE
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if (IS_INETD) {
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sessions = make_new_session(0, 1);
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if (!sessions) /* pty opening or vfork problem, exit */
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return 1; /* make_new_session prints error message */
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} else {
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//vda: inform that we start in standalone mode?
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master_fd = create_and_bind_stream_or_die(opt_bindaddr, portnbr);
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xlisten(master_fd, 1);
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if (!(opt & OPT_FOREGROUND))
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//vda: NOMMU?
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bb_daemonize(DAEMON_CHDIR_ROOT);
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}
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#else
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sessions = make_new_session();
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if (!sessions) /* pty opening or vfork problem, exit */
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return 1; /* make_new_session prints error message */
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#endif
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/* We don't want to die if just one session is broken */
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signal(SIGPIPE, SIG_IGN);
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/*
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This is how the buffers are used. The arrows indicate the movement
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of data.
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+-------+ wridx1++ +------+ rdidx1++ +----------+
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| | <-------------- | buf1 | <-------------- | |
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| | size1-- +------+ size1++ | |
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| pty | | socket |
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| | rdidx2++ +------+ wridx2++ | |
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| | --------------> | buf2 | --------------> | |
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+-------+ size2++ +------+ size2-- +----------+
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size1: "how many bytes are buffered for pty between rdidx1 and wridx1?"
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size2: "how many bytes are buffered for socket between rdidx2 and wridx2?"
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Each session has got two buffers. Buffers are circular. If sizeN == 0,
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buffer is empty. If sizeN == BUFSIZE, buffer is full. In both these cases
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rdidxN == wridxN.
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*/
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again:
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FD_ZERO(&rdfdset);
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FD_ZERO(&wrfdset);
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@ -435,12 +456,12 @@ int telnetd_main(int argc, char **argv)
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maxfd = master_fd;
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}
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/* select on the master socket, all telnet sockets and their
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* ptys if there is room in their session buffers. */
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/* Select on the master socket, all telnet sockets and their
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* ptys if there is room in their session buffers.
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* NB: scalability problem: we recalculate entire bitmap
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* before each select. Can be a problem with 500+ connections. */
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ts = sessions;
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while (ts) {
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/* buf1 is used from socket to pty
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* buf2 is used from pty to socket */
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if (ts->size1 > 0) /* can write to pty */
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FD_SET(ts->ptyfd, &wrfdset);
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if (ts->size1 < BUFSIZE) /* can read from socket */
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@ -452,9 +473,9 @@ int telnetd_main(int argc, char **argv)
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ts = ts->next;
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}
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selret = select(maxfd + 1, &rdfdset, &wrfdset, 0, 0);
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if (!selret)
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return 0;
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selret = select(maxfd + 1, &rdfdset, &wrfdset, NULL, NULL);
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if (selret < 0)
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goto again; /* EINTR or ENOMEM */
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#if ENABLE_FEATURE_TELNETD_STANDALONE
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/* First check for and accept new sessions. */
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@ -462,7 +483,7 @@ int telnetd_main(int argc, char **argv)
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int fd;
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struct tsession *new_ts;
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fd = accept(master_fd, NULL, 0);
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fd = accept(master_fd, NULL, NULL);
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if (fd < 0)
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goto again;
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/* Create a new session and link it into our active list */
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@ -481,83 +502,48 @@ int telnetd_main(int argc, char **argv)
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while (ts) { /* For all sessions... */
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struct tsession *next = ts->next; /* in case we free ts. */
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if (ts->size1 && FD_ISSET(ts->ptyfd, &wrfdset)) {
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if (/*ts->size1 &&*/ FD_ISSET(ts->ptyfd, &wrfdset)) {
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int num_totty;
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char *ptr;
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/* Write to pty from buffer 1. */
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ptr = remove_iacs(ts, &num_totty);
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w = safe_write(ts->ptyfd, ptr, num_totty);
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/* needed? if (w < 0 && errno == EAGAIN) continue; */
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if (w < 0) {
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if (errno == EAGAIN)
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goto skip1;
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if (IS_INETD)
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return 0;
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free_session(ts);
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ts = next;
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continue;
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}
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ts->wridx1 += w;
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ts->size1 -= w;
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if (ts->wridx1 == BUFSIZE)
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ts->wridx1 += w;
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if (ts->wridx1 >= BUFSIZE) /* actually == BUFSIZE */
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ts->wridx1 = 0;
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}
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if (ts->size2 && FD_ISSET(ts->sockfd_write, &wrfdset)) {
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skip1:
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if (/*ts->size2 &&*/ FD_ISSET(ts->sockfd_write, &wrfdset)) {
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/* Write to socket from buffer 2. */
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maxlen = MIN(BUFSIZE - ts->wridx2, ts->size2);
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w = safe_write(ts->sockfd_write, ts->buf2 + ts->wridx2, maxlen);
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/* needed? if (w < 0 && errno == EAGAIN) continue; */
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w = safe_write(ts->sockfd_write, TS_BUF2 + ts->wridx2, maxlen);
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if (w < 0) {
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if (errno == EAGAIN)
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goto skip2;
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if (IS_INETD)
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return 0;
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free_session(ts);
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ts = next;
|
||||
continue;
|
||||
}
|
||||
ts->wridx2 += w;
|
||||
ts->size2 -= w;
|
||||
if (ts->wridx2 == BUFSIZE)
|
||||
ts->wridx2 += w;
|
||||
if (ts->wridx2 >= BUFSIZE) /* actually == BUFSIZE */
|
||||
ts->wridx2 = 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->buf1[ts->rdidx1 + r - 1])
|
||||
if (!--r)
|
||||
continue;
|
||||
ts->rdidx1 += r;
|
||||
ts->size1 += r;
|
||||
if (ts->rdidx1 == BUFSIZE)
|
||||
ts->rdidx1 = 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;
|
||||
}
|
||||
ts->rdidx2 += r;
|
||||
ts->size2 += r;
|
||||
if (ts->rdidx2 == BUFSIZE)
|
||||
ts->rdidx2 = 0;
|
||||
}
|
||||
|
||||
skip2:
|
||||
#if 0
|
||||
/* Not strictly needed, but allows for bigger reads in common case */
|
||||
if (ts->size1 == 0) {
|
||||
ts->rdidx1 = 0;
|
||||
ts->wridx1 = 0;
|
||||
@ -566,6 +552,50 @@ int telnetd_main(int argc, char **argv)
|
||||
ts->rdidx2 = 0;
|
||||
ts->wridx2 = 0;
|
||||
}
|
||||
#endif
|
||||
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) {
|
||||
if (r < 0 && errno == EAGAIN)
|
||||
goto skip3;
|
||||
if (IS_INETD)
|
||||
return 0;
|
||||
free_session(ts);
|
||||
ts = next;
|
||||
continue;
|
||||
}
|
||||
/* Ignore trailing NUL if it is there */
|
||||
if (!TS_BUF1[ts->rdidx1 + r - 1]) {
|
||||
if (!--r)
|
||||
goto skip3;
|
||||
}
|
||||
ts->size1 += r;
|
||||
ts->rdidx1 += r;
|
||||
if (ts->rdidx1 >= BUFSIZE) /* actually == BUFSIZE */
|
||||
ts->rdidx1 = 0;
|
||||
}
|
||||
skip3:
|
||||
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) {
|
||||
if (r < 0 && errno == EAGAIN)
|
||||
goto skip4;
|
||||
if (IS_INETD)
|
||||
return 0;
|
||||
free_session(ts);
|
||||
ts = next;
|
||||
continue;
|
||||
}
|
||||
ts->size2 += r;
|
||||
ts->rdidx2 += r;
|
||||
if (ts->rdidx2 >= BUFSIZE) /* actually == BUFSIZE */
|
||||
ts->rdidx2 = 0;
|
||||
}
|
||||
skip4:
|
||||
ts = next;
|
||||
}
|
||||
goto again;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user