run telnet from inetd, present login prompt if login is configured,

patch from Bastian Blank

6 files changed, 121 insertions, 157 deletions

diff --git a/include/libbb.h b/include/libbb.h
index d67bf07ec..42e89a5e9 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -277,7 +277,6 @@ extern const char * const gshadow_file;
 extern const char * const group_file;
 extern const char * const securetty_file;
 extern const char * const motd_file;
-extern const char * const issue_file;
 extern const char * const _path_login;
 
 #ifdef CONFIG_FEATURE_DEVFS
@@ -365,4 +364,7 @@ typedef struct llist_s {
 } llist_t;
 extern llist_t *llist_add_to(llist_t *old_head, char *new_item);
 
+void print_login_issue(const char *issue_file, const char *tty);
+void print_login_prompt(void);
+
 #endif /* __LIBCONFIG_H__ */
diff --git a/libbb/Makefile.in b/libbb/Makefile.in
index c97f7d2b3..08f8028d9 100644
--- a/libbb/Makefile.in
+++ b/libbb/Makefile.in
@@ -33,7 +33,7 @@ LIBBB_SRC:= \
         get_last_path_component.c get_line_from_file.c herror_msg.c \
         herror_msg_and_die.c human_readable.c inet_common.c inode_hash.c \
         interface.c isdirectory.c kernel_version.c last_char_is.c libc5.c \
-        llist_add_to.c loop.c make_directory.c mode_string.c \
+        llist_add_to.c login.c loop.c make_directory.c mode_string.c \
         module_syscalls.c mtab.c mtab_file.c my_getgrgid.c my_getgrnam.c \
         my_getpwnam.c my_getpwnamegid.c my_getpwuid.c obscure.c parse_mode.c \
         parse_number.c perror_msg.c perror_msg_and_die.c print_file.c \
diff --git a/loginutils/getty.c b/loginutils/getty.c
index 0f0778caf..1b9c6ac4d 100644
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -73,8 +73,6 @@ extern void updwtmp(const char *filename, const struct utmp *ut);
 #include <time.h>
 #endif
 
-#define LOGIN " login: "                /* login prompt */
-
 /* Some shorthands for control characters. */
 
 #define CTL(x)          (x ^ 0100)      /* Assumes ASCII dialect */
@@ -752,142 +750,10 @@ static void auto_baud(struct termio *tp)
 /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
 static void do_prompt(struct options *op, struct termio *tp)
 {
-#ifdef  ISSUE
-        FILE *fd;
-        int oflag;
-        int c;
-        struct utsname uts;
-
-        (void) uname(&uts);
-#endif
-
-        (void) write(1, "\r\n", 2);     /* start a new line */
 #ifdef  ISSUE                                   /* optional: show /etc/issue */
-        if ((op->flags & F_ISSUE) && (fd = fopen(op->issue, "r"))) {
-                oflag = tp->c_oflag;    /* save current setting */
-                tp->c_oflag |= (ONLCR | OPOST); /* map NL in output to CR-NL */
-                (void) ioctl(0, TCSETAW, tp);
-
-
-                while ((c = getc(fd)) != EOF) {
-                        if (c == '\\') {
-                                c = getc(fd);
-
-                                switch (c) {
-                                case 's':
-                                        (void) printf("%s", uts.sysname);
-                                        break;
-
-                                case 'n':
-                                        (void) printf("%s", uts.nodename);
-                                        break;
-
-                                case 'r':
-                                        (void) printf("%s", uts.release);
-                                        break;
-
-                                case 'v':
-                                        (void) printf("%s", uts.version);
-                                        break;
-
-                                case 'm':
-                                        (void) printf("%s", uts.machine);
-                                        break;
-
-                                case 'o':
-                                {
-                                        char domainname[256];
-
-                                        getdomainname(domainname, sizeof(domainname));
-                                        domainname[sizeof(domainname) - 1] = '\0';
-                                        printf("%s", domainname);
-                                }
-                                        break;
-
-                                case 'd':
-                                case 't':
-                                {
-                                        char *weekday[] = { "Sun", "Mon", "Tue", "Wed", "Thu",
-                                                "Fri", "Sat"
-                                        };
-                                        char *month[] = { "Jan", "Feb", "Mar", "Apr", "May",
-                                                "Jun", "Jul", "Aug", "Sep", "Oct",
-                                                "Nov", "Dec"
-                                        };
-                                        time_t now;
-                                        struct tm *tm;
-
-                                        (void) time(&now);
-                                        tm = localtime(&now);
-
-                                        if (c == 'd')
-                                                (void) printf("%s %s %d  %d",
-                                                                          weekday[tm->tm_wday],
-                                                                          month[tm->tm_mon], tm->tm_mday,
-                                                                          tm->tm_year <
-                                                                          70 ? tm->tm_year +
-                                                                          2000 : tm->tm_year + 1900);
-                                        else
-                                                (void) printf("%02d:%02d:%02d", tm->tm_hour,
-                                                                          tm->tm_min, tm->tm_sec);
-
-                                        break;
-                                }
-
-                                case 'l':
-                                        (void) printf("%s", op->tty);
-                                        break;
-
-                                case 'b':
-                                {
-                                        int i;
-
-                                        for (i = 0; speedtab[i].speed; i++) {
-                                                if (speedtab[i].code == (tp->c_cflag & CBAUD)) {
-                                                        printf("%ld", speedtab[i].speed);
-                                                        break;
-                                                }
-                                        }
-                                        break;
-                                }
-                                case 'u':
-                                case 'U':
-                                {
-                                        int users = 0;
-                                        struct utmp *ut;
-
-                                        setutent();
-                                        while ((ut = getutent()))
-                                                if (ut->ut_type == USER_PROCESS)
-                                                        users++;
-                                        endutent();
-                                        printf("%d ", users);
-                                        if (c == 'U')
-                                                printf((users == 1) ? "user" : "users");
-                                        break;
-                                }
-                                default:
-                                        (void) putchar(c);
-                                }
-                        } else
-                                (void) putchar(c);
-                }
-                fflush(stdout);
-
-                tp->c_oflag = oflag;    /* restore settings */
-                (void) ioctl(0, TCSETAW, tp);   /* wait till output is gone */
-                (void) fclose(fd);
-        }
-#endif
-#ifdef __linux__
-        {
-                char hn[MAXHOSTNAMELEN + 1];
-
-                (void) gethostname(hn, MAXHOSTNAMELEN);
-                write(1, hn, strlen(hn));
-        }
+        print_login_issue(op->issue, op->tty);
 #endif
-        (void) write(1, LOGIN, sizeof(LOGIN) - 1);      /* always show login prompt */
+        print_login_prompt();
 }
 
 /* next_speed - select next baud rate */
diff --git a/loginutils/login.c b/loginutils/login.c
index 4a7f13ae8..c1ea165c8 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -253,20 +253,18 @@ static int login_prompt ( char *buf_name )
         int i;
 
         for(i=0; i<EMPTY_USERNAME_COUNT; i++) {
-        gethostname ( buf, sizeof( buf ));
-        printf ( "\n%s login: ", buf );
-        fflush ( stdout );
+                print_login_prompt();
+
+                if ( !fgets ( buf, sizeof( buf ) - 1, stdin ))
+                        return 0;
 
-        if ( !fgets ( buf, sizeof( buf ) - 1, stdin ))
-                return 0;
-                
                 if ( !strchr ( buf, '\n' ))
-                return 0;
-        
-        for ( sp = buf; isspace ( *sp ); sp++ ) { }
-        for ( ep = sp; isgraph ( *ep ); ep++ ) { }
+                        return 0;
+
+                for ( sp = buf; isspace ( *sp ); sp++ ) { }
+                for ( ep = sp; isgraph ( *ep ); ep++ ) { }
 
-        *ep = 0;                
+                *ep = 0;                
                 safe_strncpy(buf_name, sp, USERNAME_SIZE);
                 if(buf_name[0])
                         return 1;
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);