From 9e5d6c002ca589fb2e767fc8bafd6ceddaa12d39 Mon Sep 17 00:00:00 2001 From: Glenn L McGrath Date: Tue, 21 Jan 2003 20:55:56 +0000 Subject: run telnet from inetd, present login prompt if login is configured, patch from Bastian Blank --- networking/Config.in | 7 ++++ networking/telnetd.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++---- 2 files changed, 106 insertions(+), 8 deletions(-) (limited to 'networking') diff --git a/networking/Config.in b/networking/Config.in index bc1178007..ebefd600d 100644 --- a/networking/Config.in +++ b/networking/Config.in @@ -315,6 +315,13 @@ config CONFIG_TELNETD help Please submit a patch to add help text for this item. +config CONFIG_FEATURE_TELNETD_INETD + bool " Use inetd" + default n + depends on CONFIG_TELNETD + help + Please submit a patch to add help text for this item. + config CONFIG_TFTP bool "tftp" default n diff --git a/networking/telnetd.c b/networking/telnetd.c index d208319a3..d17682eb4 100644 --- a/networking/telnetd.c +++ b/networking/telnetd.c @@ -1,4 +1,4 @@ -/* $Id: telnetd.c,v 1.2 2002/11/10 22:26:19 bug1 Exp $ +/* $Id: telnetd.c,v 1.3 2003/01/21 20:55:56 bug1 Exp $ * * Simple telnet server * Bjorn Wesen, Axis Communications AB (bjornw@axis.com) @@ -48,7 +48,13 @@ #define BUFSIZE 4000 -static const char *loginpath = "/bin/sh"; +static const char *loginpath = +#ifdef CONFIG_LOGIN +"/bin/login"; +#else +"/bin/sh"; +#endif +static const char *issuefile = "/etc/issue.net"; /* shell name and arguments */ @@ -57,8 +63,12 @@ static const char *argv_init[] = {NULL, NULL}; /* 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 shell_pid; /* two circular buffers */ char *buf1, *buf2; @@ -204,7 +214,11 @@ send_iac(struct tsession *ts, unsigned char command, int option) 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 */ { struct termios termbuf; int pty, pid; @@ -214,7 +228,12 @@ make_new_session(int sockfd) 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; @@ -278,6 +297,8 @@ make_new_session(int sockfd) /*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); @@ -291,6 +312,7 @@ make_new_session(int sockfd) return ts; } +#ifndef CONFIG_FEATURE_TELNETD_INETD static void free_session(struct tsession *ts) { @@ -319,30 +341,44 @@ free_session(struct tsession *ts) free(ts); } +#endif /* CONFIG_FEATURE_TELNETD_INETD */ int telnetd_main(int argc, char **argv) { +#ifndef CONFIG_FEATURE_TELNETD_INETD struct sockaddr_in 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; +#endif /* CONFIG_FEATURE_TELNETD_INETD */ int c; - - /* check if user supplied a port number */ + static const char options[] = +#ifdef CONFIG_FEATURE_TELNETD_INETD + "f:l:"; +#else /* CONFIG_EATURE_TELNETD_INETD */ + "f:l:p:"; +#endif /* CONFIG_FEATURE_TELNETD_INETD */ for (;;) { - c = getopt( argc, argv, "p:l:"); + c = getopt( argc, argv, options); if (c == EOF) break; switch (c) { - case 'p': - portnbr = atoi(optarg); + case 'f': + issuefile = strdup (optarg); break; case 'l': loginpath = strdup (optarg); break; +#ifndef CONFIG_FEATURE_TELNETD_INETD + case 'p': + portnbr = atoi(optarg); + break; +#endif /* CONFIG_FEATURE_TELNETD_INETD */ default: show_usage(); } @@ -353,6 +389,12 @@ telnetd_main(int argc, char **argv) } argv_init[0] = loginpath; + +#ifdef CONFIG_FEATURE_TELNETD_INETD + sessions = make_new_session(); + + maxfd = 1; +#else /* CONFIG_EATURE_TELNETD_INETD */ sessions = 0; /* Grab a TCP socket. */ @@ -382,6 +424,7 @@ telnetd_main(int argc, char **argv) maxfd = master_fd; +#endif /* CONFIG_FEATURE_TELNETD_INETD */ do { struct tsession *ts; @@ -393,10 +436,14 @@ telnetd_main(int argc, char **argv) * ptys if there is room in their respective session buffers. */ +#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 */ @@ -404,22 +451,33 @@ telnetd_main(int argc, char **argv) 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; } +#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; @@ -447,9 +505,12 @@ telnetd_main(int argc, char **argv) ts = sessions; while (ts) { /* For all sessions... */ +#endif /* CONFIG_FEATURE_TELNETD_INETD */ int maxlen, w, r; +#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; @@ -459,9 +520,13 @@ telnetd_main(int argc, char **argv) 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; @@ -469,31 +534,51 @@ telnetd_main(int argc, char **argv) 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; } +#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) @@ -511,9 +596,13 @@ telnetd_main(int argc, char **argv) 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; continue; +#endif /* CONFIG_FEATURE_TELNETD_INETD */ } ts->rdidx2 += r; ts->size2 += r; @@ -529,8 +618,10 @@ telnetd_main(int argc, char **argv) ts->rdidx2 = 0; ts->wridx2 = 0; } +#ifndef CONFIG_FEATURE_TELNETD_INETD ts = next; } +#endif /* CONFIG_FEATURE_TELNETD_INETD */ } while (1); -- cgit v1.2.3