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- /*
- * @(#)munetd.c 1.10 92/01/17 - pseudo tty server a la inetd
- * based on BSD 4.4 inetd.c
- */
- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted provided
- * that: (1) source distributions retain this entire copyright notice and
- * comment, and (2) distributions including binaries display the following
- * acknowledgement: ``This product includes software developed by the
- * University of California, Berkeley and its contributors'' in the
- * documentation or other materials provided with the distribution and in
- * all advertising materials mentioning features or use of this software.
- * Neither the name of the University nor the names of its contributors may
- * be used to endorse or promote products derived from this software without
- * specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #ifndef lint
- char copyright[] =
- "@(#) Copyright (c) 1983 Regents of the University of California.\n\
- All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char bsdsccsid[] = "@(#)inetd.c 5.25 (Berkeley) 6/29/90";
- static char sccsid[] = "@(#)munetd.c 1.10 (Erasmus) 1/17/92";
- #endif /* not lint */
-
- /*
- * Inetd - Internet super-server
- *
- * This program invokes all internet services as needed.
- * connection-oriented services are invoked each time a
- * connection is made, by creating a process. This process
- * is passed the connection as file descriptor 0 and is
- * expected to do a getpeername to find out the source host
- * and port.
- *
- * Datagram oriented services are invoked when a datagram
- * arrives; a process is created and passed a pending message
- * on file descriptor 0. Datagram servers may either connect
- * to their peer, freeing up the original socket for inetd
- * to receive further messages on, or ``take over the socket'',
- * processing all arriving datagrams and, eventually, timing
- * out. The first type of server is said to be ``multi-threaded'';
- * the second type of server ``single-threaded''.
- *
- * Inetd uses a configuration file which is read at startup
- * and, possibly, at some later time in response to a hangup signal.
- * The configuration file is ``free format'' with fields given in the
- * order shown below. Continuation lines for an entry must being with
- * a space or tab. All fields must be present in each entry.
- *
- * service name must be in /etc/services
- * socket type stream/dgram/raw/rdm/seqpacket
- * protocol must be in /etc/protocols
- * wait/nowait single-threaded/multi-threaded
- * user user to run daemon as
- * server program full path name
- * server program arguments maximum of MAXARGS (20)
- *
- * Comment lines are indicated by a `#' in column 1.
- */
- #include <sys/param.h>
- #include <sys/stat.h>
- #include <sys/ioctl.h>
- #include <sys/socket.h>
- #include <sys/un.h>
- #include <sys/file.h>
- #include <sys/wait.h>
- #include <sys/time.h>
- #include <sys/resource.h>
-
- #include <netinet/in.h>
- #include <arpa/inet.h>
-
- #include <errno.h>
- #include <signal.h>
- #include <netdb.h>
- #include <syslog.h>
- #include <pwd.h>
- #include <stdio.h>
- #include <string.h>
- #if 0
- #include "pathnames.h"
- #endif
-
- #define TOOMANY 40 /* don't start more than TOOMANY */
- #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
- #define RETRYTIME (60*10) /* retry after bind or server fail */
-
- #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
-
- extern int errno;
-
- void config(), reapchild(), retry();
- char *index();
- char *malloc();
-
- int debug = 0;
- int nsock, maxsock;
- fd_set allsock;
- fd_set allpty;
- int options;
- int timingout;
- struct servent *sp;
-
- struct servtab {
- char *se_service; /* name of service */
- int se_socktype; /* type of socket to use */
- int se_family; /* address family */
- #define AF_PTY 0xf0000000
- #define isrealsock(sep) ((sep)->se_family == AF_INET || \
- (sep)->se_family == AF_UNIX)
- char *se_proto; /* protocol used */
- int se_rpcprog; /* rpc program number */
- int se_rpcversl; /* rpc program lowest version */
- int se_rpcversh; /* rpc program highest version */
- #define isrpcservice(sep) ((sep)->se_rpcversl != 0)
- short se_wait; /* single threaded server */
- short se_checked; /* looked at during merge */
- char *se_user; /* user name to run as */
- struct biltin *se_bi; /* if built-in, description */
- char *se_server; /* server program */
- #define MAXARGV 20
- char *se_argv[MAXARGV+1]; /* program arguments */
- int se_fd; /* open descriptor */
- union {
- struct sockaddr se_un_ctrladdr;
- struct sockaddr_in se_un_ctrladdr_in;
- struct sockaddr_un se_un_ctrladdr_un;
- } se_un; /* bound address */
- #define se_ctrladdr se_un.se_un_ctrladdr
- #define se_ctrladdr_in se_un.se_un_ctrladdr_in
- #define se_ctrladdr_un se_un.se_un_ctrladdr_un
- int se_ctrladdr_size;
- int se_count; /* number started since se_time */
- struct timeval se_time; /* start of se_count */
- struct servtab *se_next;
- } *servtab;
-
- int echo_stream(), discard_stream(), machtime_stream();
- int daytime_stream(), chargen_stream();
- int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg();
-
- struct biltin {
- char *bi_service; /* internally provided service name */
- int bi_socktype; /* type of socket supported */
- short bi_fork; /* 1 if should fork before call */
- short bi_wait; /* 1 if should wait for child */
- int (*bi_fn)(); /* function which performs it */
- } biltins[] = {
- /* Echo received data */
- "echo", SOCK_STREAM, 1, 0, echo_stream,
- "echo", SOCK_DGRAM, 0, 0, echo_dg,
-
- /* Internet /dev/null */
- "discard", SOCK_STREAM, 1, 0, discard_stream,
- "discard", SOCK_DGRAM, 0, 0, discard_dg,
-
- /* Return 32 bit time since 1900 */
- "time", SOCK_STREAM, 0, 0, machtime_stream,
- "time", SOCK_DGRAM, 0, 0, machtime_dg,
-
- /* Return human-readable time */
- "daytime", SOCK_STREAM, 0, 0, daytime_stream,
- "daytime", SOCK_DGRAM, 0, 0, daytime_dg,
-
- /* Familiar character generator */
- "chargen", SOCK_STREAM, 1, 0, chargen_stream,
- "chargen", SOCK_DGRAM, 0, 0, chargen_dg,
- 0
- };
-
- #define NUMINT (sizeof(intab) / sizeof(struct inent))
- #ifdef _PATH_INETDCONF
- char *CONFIG = _PATH_INETDCONF;
- #else
- char *CONFIG = "/etc/inetd.conf";
- #endif
- #ifdef _PATH_INETDPID
- char *PIDFILE = _PATH_INETDPID;
- #else
- char *PIDFILE = "/etc/inetd.pid";
- #endif
- char **Argv;
- char *LastArg;
-
- main(argc, argv, envp)
- int argc;
- char *argv[], *envp[];
- {
- extern char *optarg;
- extern int optind;
- register struct servtab *sep;
- register struct passwd *pwd;
- register int tmpint;
- struct sigvec sv;
- int ch, pid, dofork;
- char buf[50];
-
- Argv = argv;
- if (envp == 0 || *envp == 0)
- envp = argv;
- while (*envp)
- envp++;
- LastArg = envp[-1] + strlen(envp[-1]);
-
- while ((ch = getopt(argc, argv, "d")) != EOF)
- switch(ch) {
- case 'd':
- debug = 1;
- options |= SO_DEBUG;
- break;
- case '?':
- default:
- fprintf(stderr, "usage: munetd [-d]");
- exit(1);
- }
- argc -= optind;
- argv += optind;
-
- if (argc > 0)
- CONFIG = argv[0];
- #ifdef sun
- bump_nofile();
- #endif
- if (debug == 0)
- daemon(0, 0);
- openlog("munetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
- logpid();
- bzero((char *)&sv, sizeof(sv));
- sv.sv_mask = SIGBLOCK;
- sv.sv_handler = retry;
- sigvec(SIGALRM, &sv, (struct sigvec *)0);
- config();
- sv.sv_handler = config;
- sigvec(SIGHUP, &sv, (struct sigvec *)0);
- sv.sv_handler = reapchild;
- sigvec(SIGCHLD, &sv, (struct sigvec *)0);
-
- {
- /* space for daemons to overwrite environment for ps */
- #define DUMMYSIZE 100
- char dummy[DUMMYSIZE];
-
- (void)memset(dummy, 'x', DUMMYSIZE - 1);
- dummy[DUMMYSIZE - 1] = '\0';
-
- (void)setenv("inetd_dummy", dummy, 1);
- }
-
- for (;;) {
- int n, ctrl;
- fd_set readable, writable;
-
- if (nsock == 0) {
- (void) sigblock(SIGBLOCK);
- while (nsock == 0)
- sigpause(0L);
- (void) sigsetmask(0L);
- }
- readable = allsock;
- writable = allpty;
- if ((n = select(maxsock + 1, &readable, &writable,
- (fd_set *)0, (struct timeval *)0)) <= 0) {
- if (n < 0 && errno != EINTR)
- syslog(LOG_WARNING, "select: %m\n");
- sleep(1);
- continue;
- }
- for (sep = servtab; n && sep; sep = sep->se_next)
- if (sep->se_fd != -1 && (
- FD_ISSET(sep->se_fd, &readable) ||
- FD_ISSET(sep->se_fd, &writable) )) {
- n--;
- if (debug)
- fprintf(stderr, "someone wants %s\n", sep->se_service);
- if (isrealsock(sep) && sep->se_socktype == SOCK_STREAM) {
- ctrl = accept(sep->se_fd, (struct sockaddr *)0,
- (int *)0);
- if (debug)
- fprintf(stderr, "accept, ctrl %d\n", ctrl);
- if (ctrl < 0) {
- if (errno == EINTR)
- continue;
- syslog(LOG_WARNING, "accept (for %s): %m",
- sep->se_service);
- continue;
- }
- } else
- ctrl = sep->se_fd;
- (void) sigblock(SIGBLOCK);
- pid = 0;
- dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork);
- if (dofork) {
- if (sep->se_count++ == 0)
- (void)gettimeofday(&sep->se_time,
- (struct timezone *)0);
- else if (sep->se_count >= TOOMANY) {
- struct timeval now;
-
- (void)gettimeofday(&now, (struct timezone *)0);
- if (now.tv_sec - sep->se_time.tv_sec >
- CNT_INTVL) {
- sep->se_time = now;
- sep->se_count = 1;
- } else {
- syslog(LOG_ERR,
- "%s/%s server failing (looping), service terminated\n",
- sep->se_service, sep->se_proto);
- FD_CLR(sep->se_fd, &allsock);
- if (sep->se_family == AF_PTY)
- FD_CLR(sep->se_fd, &allpty);
- (void) close(sep->se_fd);
- sep->se_fd = -1;
- sep->se_count = 0;
- nsock--;
- sigsetmask(0L);
- if (!timingout) {
- timingout = 1;
- alarm(RETRYTIME);
- }
- continue;
- }
- }
- pid = fork();
- }
- if (pid < 0) {
- if (isrealsock(sep) && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- sigsetmask(0L);
- sleep(1);
- continue;
- }
- if (pid && sep->se_wait) {
- sep->se_wait = pid;
- FD_CLR(sep->se_fd, &allsock);
- if (sep->se_family == AF_PTY)
- FD_CLR(sep->se_fd, &allpty);
- nsock--;
- }
- sigsetmask(0L);
- if (pid == 0) {
- if (debug && dofork)
- setsid();
- if (sep->se_bi)
- (*sep->se_bi->bi_fn)(ctrl, sep);
- else {
- if ((pwd = getpwnam(sep->se_user)) == NULL) {
- syslog(LOG_ERR,
- "getpwnam: %s: No such user",
- sep->se_user);
- if (isrealsock(sep) &&
- sep->se_socktype != SOCK_STREAM)
- recv(0, buf, sizeof (buf), 0);
- _exit(1);
- }
- if (pwd->pw_uid) {
- (void) setgid((gid_t)pwd->pw_gid);
- initgroups(pwd->pw_name, pwd->pw_gid);
- (void) setuid((uid_t)pwd->pw_uid);
- }
- if (debug)
- fprintf(stderr, "%d execl %s\n",
- getpid(), sep->se_server);
- dup2(ctrl, 0);
- close(ctrl);
- dup2(0, 1);
- dup2(0, 2);
- for (tmpint = getdtablesize(); --tmpint > 2; )
- (void)close(tmpint);
- execv(sep->se_server, sep->se_argv);
- if (isrealsock(sep) &&
- sep->se_socktype != SOCK_STREAM)
- recv(0, buf, sizeof (buf), 0);
- syslog(LOG_ERR, "execv %s: %m", sep->se_server);
- _exit(1);
- }
- }
- if (isrealsock(sep) && sep->se_socktype == SOCK_STREAM)
- close(ctrl);
- if (sep->se_family == AF_PTY) {
- close(sep->se_fd);
- sep->se_fd = -1;
- }
- }
- }
- }
-
- void
- reapchild()
- {
- union wait status;
- int pid;
- register struct servtab *sep;
-
- for (;;) {
- pid = wait3(&status, WNOHANG, (struct rusage *)0);
- if (pid <= 0)
- break;
- if (debug)
- fprintf(stderr, "%d reaped\n", pid);
- for (sep = servtab; sep; sep = sep->se_next)
- if (sep->se_wait == pid) {
- if (status.w_status)
- syslog(LOG_WARNING,
- "%s: exit status 0x%x",
- sep->se_server, status.w_retcode);
- sep->se_wait = 1;
- if (sep->se_family == AF_PTY) {
- setuppty(sep);
- } else {
- FD_SET(sep->se_fd, &allsock);
- nsock++;
- }
- if (debug)
- fprintf(stderr, "restored %s, fd %d\n",
- sep->se_service, sep->se_fd);
- }
- }
- }
-
- void
- config()
- {
- register struct servtab *sep, *cp, **sepp;
- struct servtab *getconfigent(), *enter();
- long omask;
- int n;
-
- if (!setconfig()) {
- syslog(LOG_ERR, "%s: %m", CONFIG);
- return;
- }
- for (sep = servtab; sep; sep = sep->se_next)
- sep->se_checked = 0;
- while (cp = getconfigent()) {
- for (sep = servtab; sep; sep = sep->se_next)
- if (strcmp(sep->se_service, cp->se_service) == 0 &&
- strcmp(sep->se_proto, cp->se_proto) == 0)
- break;
- if (sep != 0) {
- int i;
-
- omask = sigblock(SIGBLOCK);
- /*
- * sep->se_wait may be holding the pid of a daemon
- * that we're waiting for. If so, don't overwrite
- * it unless the config file explicitly says don't
- * wait.
- */
- if (cp->se_bi == 0 &&
- (sep->se_wait == 1 || cp->se_wait == 0))
- sep->se_wait = cp->se_wait;
- #define SWAP(a, b) { char *c = a; a = b; b = c; }
- if (cp->se_user)
- SWAP(sep->se_user, cp->se_user);
- if (cp->se_server)
- SWAP(sep->se_server, cp->se_server);
- for (i = 0; i < MAXARGV; i++)
- SWAP(sep->se_argv[i], cp->se_argv[i]);
- if (isrpcservice(sep))
- unregister_rpc(sep);
- sep->se_rpcversl = cp->se_rpcversl;
- sep->se_rpcversh = cp->se_rpcversh;
- sigsetmask(omask);
- freeconfig(cp);
- if (debug)
- print_service("REDO", sep);
- } else {
- sep = enter(cp);
- if (debug)
- print_service("ADD ", sep);
- }
- sep->se_checked = 1;
-
- switch (sep->se_family) {
- case AF_UNIX:
- if (sep->se_fd != -1)
- break;
- (void)unlink(sep->se_service);
- n = strlen(sep->se_service);
- if (n > sizeof sep->se_ctrladdr_un.sun_path - 1)
- n = sizeof sep->se_ctrladdr_un.sun_path - 1;
- strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n);
- sep->se_ctrladdr_un.sun_family = AF_UNIX;
- sep->se_ctrladdr_size = n +
- sizeof sep->se_ctrladdr_un.sun_family;
- setup(sep);
- break;
- case AF_PTY:
- if (sep->se_fd == -1 && sep->se_wait == 1)
- setuppty(sep);
- break;
- case AF_INET:
- sep->se_ctrladdr_in.sin_family = AF_INET;
- sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
- if (isrpcservice(sep)) {
- struct rpcent *rp;
-
- sep->se_rpcprog = atoi(sep->se_service);
- if (sep->se_rpcprog == 0) {
- rp = getrpcbyname(sep->se_service);
- if (rp == 0) {
- syslog(LOG_ERR,
- "%s: unknown service",
- sep->se_service);
- continue;
- }
- sep->se_rpcprog = rp->r_number;
- }
- if (sep->se_fd == -1)
- setup(sep);
- if (sep->se_fd != -1)
- register_rpc(sep);
- } else {
- u_short port = htons(atoi(sep->se_service));
-
- if (!port) {
- sp = getservbyname(sep->se_service,
- sep->se_proto);
- if (sp == 0) {
- syslog(LOG_ERR,
- "%s/%s: unknown service",
- sep->se_service, sep->se_proto);
- continue;
- }
- port = sp->s_port;
- }
- if (port != sep->se_ctrladdr_in.sin_port) {
- sep->se_ctrladdr_in.sin_port = port;
- if (sep->se_fd != -1) {
- FD_CLR(sep->se_fd, &allsock);
- nsock--;
- (void) close(sep->se_fd);
- }
- sep->se_fd = -1;
- }
- if (sep->se_fd == -1)
- setup(sep);
- }
- }
- }
- endconfig();
- /*
- * Purge anything not looked at above.
- */
- omask = sigblock(SIGBLOCK);
- sepp = &servtab;
- while (sep = *sepp) {
- if (sep->se_checked) {
- sepp = &sep->se_next;
- continue;
- }
- *sepp = sep->se_next;
- if (sep->se_fd != -1) {
- FD_CLR(sep->se_fd, &allsock);
- if (sep->se_family == AF_PTY)
- FD_CLR(sep->se_fd, &allpty);
- nsock--;
- (void) close(sep->se_fd);
- }
- if (isrpcservice(sep))
- unregister_rpc(sep);
- if (sep->se_family == AF_UNIX)
- (void)unlink(sep->se_service);
- if (debug)
- print_service("FREE", sep);
- freeconfig(sep);
- free((char *)sep);
- }
- (void) sigsetmask(omask);
- }
-
- void
- retry()
- {
- register struct servtab *sep;
-
- timingout = 0;
- for (sep = servtab; sep; sep = sep->se_next)
- if (sep->se_fd == -1) {
- switch (sep->se_family) {
- case AF_UNIX:
- case AF_INET:
- setup(sep);
- if (sep->se_fd != -1 && isrpcservice(sep))
- register_rpc(sep);
- break;
- case AF_PTY:
- if (sep->se_wait == 1)
- setuppty(sep);
- break;
- }
- }
- }
-
- setup(sep)
- register struct servtab *sep;
- {
- int on = 1;
-
- if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
- syslog(LOG_ERR, "%s/%s: socket: %m",
- sep->se_service, sep->se_proto);
- return;
- }
- #define turnon(fd, opt) \
- setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
- if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
- turnon(sep->se_fd, SO_DEBUG) < 0)
- syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
- if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
- syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
- #undef turnon
- if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) {
- syslog(LOG_ERR, "%s/%s: bind: %m",
- sep->se_service, sep->se_proto);
- (void) close(sep->se_fd);
- sep->se_fd = -1;
- if (!timingout) {
- timingout = 1;
- alarm(RETRYTIME);
- }
- return;
- }
- if (sep->se_socktype == SOCK_STREAM)
- listen(sep->se_fd, 10);
-
- FD_SET(sep->se_fd, &allsock);
- nsock++;
- if (sep->se_fd > maxsock)
- maxsock = sep->se_fd;
- }
-
- register_rpc(sep)
- register struct servtab *sep;
- {
- #if RPC
- int n;
- struct sockaddr_in sin;
- struct protoent *pp;
-
- if ((pp = getprotobyname(sep->se_proto+4)) == NULL) {
- syslog(LOG_ERR, "%s: getproto: %m",
- sep->se_proto);
- return;
- }
- n = sizeof sin;
- if (getsockname(sep->se_fd, &sin, &n) < 0) {
- syslog(LOG_ERR, "%s/%s: getsockname: %m",
- sep->se_service, sep->se_proto);
- return;
- }
-
- for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
- if (debug)
- fprintf(stderr, "pmap_set: %u %u %u %u\n",
- sep->se_rpcprog, n, pp->p_proto, sin.sin_port);
- if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, sin.sin_port))
- syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m",
- sep->se_rpcprog, n, pp->p_proto, sin.sin_port);
- }
- #endif RPC
- }
-
- unregister_rpc(sep)
- register struct servtab *sep;
- {
- int n;
-
- #if RPC
- for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
- if (debug)
- fprintf(stderr, "pmap_unset(%u, %u)\n",
- sep->se_rpcprog, n);
- if (!pmap_unset(sep->se_rpcprog, n))
- syslog(LOG_ERR, "pmap_unset(%u, %u)\n",
- sep->se_rpcprog, n);
- }
- #endif RPC
- }
-
- setuppty(sep)
- register struct servtab *sep;
- {
- if ((sep->se_fd = open(sep->se_service, O_RDWR, 0)) < 0) {
- syslog(LOG_ERR, "%s/%s: open: %m",
- sep->se_service, sep->se_proto);
- if (!timingout) {
- timingout = 1;
- alarm(RETRYTIME);
- }
- return;
- }
- FD_SET(sep->se_fd, &allsock);
- FD_SET(sep->se_fd, &allpty);
- nsock++;
- if (sep->se_fd > maxsock)
- maxsock = sep->se_fd;
- }
-
- struct servtab *
- enter(cp)
- struct servtab *cp;
- {
- register struct servtab *sep;
- long omask;
-
- sep = (struct servtab *)malloc(sizeof (*sep));
- if (sep == (struct servtab *)0) {
- syslog(LOG_ERR, "Out of memory.");
- exit(-1);
- }
- *sep = *cp;
- sep->se_fd = -1;
- sep->se_rpcprog = -1;
- omask = sigblock(SIGBLOCK);
- sep->se_next = servtab;
- servtab = sep;
- sigsetmask(omask);
- return (sep);
- }
-
- FILE *fconfig = NULL;
- struct servtab serv;
- char line[256];
- char *skip(), *nextline();
-
- setconfig()
- {
-
- if (fconfig != NULL) {
- fseek(fconfig, 0L, L_SET);
- return (1);
- }
- fconfig = fopen(CONFIG, "r");
- return (fconfig != NULL);
- }
-
- endconfig()
- {
- if (fconfig) {
- (void) fclose(fconfig);
- fconfig = NULL;
- }
- }
-
- struct servtab *
- getconfigent()
- {
- register struct servtab *sep = &serv;
- int argc;
- char *cp, *arg, *strdup();
-
- more:
- while ((cp = nextline(fconfig)) && *cp == '#')
- ;
- if (cp == NULL)
- return ((struct servtab *)0);
- bzero((char *)sep, sizeof *sep);
- sep->se_service = strdup(skip(&cp));
- arg = skip(&cp);
- if (strcmp(arg, "stream") == 0)
- sep->se_socktype = SOCK_STREAM;
- else if (strcmp(arg, "dgram") == 0)
- sep->se_socktype = SOCK_DGRAM;
- else if (strcmp(arg, "rdm") == 0)
- sep->se_socktype = SOCK_RDM;
- else if (strcmp(arg, "seqpacket") == 0)
- sep->se_socktype = SOCK_SEQPACKET;
- else if (strcmp(arg, "raw") == 0)
- sep->se_socktype = SOCK_RAW;
- else
- sep->se_socktype = -1;
-
- sep->se_proto = strdup(skip(&cp));
- if (strcmp(sep->se_proto, "pty") == 0) {
- sep->se_family = AF_PTY;
- } else if (strcmp(sep->se_proto, "unix") == 0) {
- sep->se_family = AF_UNIX;
- } else {
- sep->se_family = AF_INET;
- if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
- #if RPC
- char *cp, *ccp;
- cp = index(sep->se_service, '/');
- if (cp == 0) {
- syslog(LOG_ERR, "%s: no rpc version",
- sep->se_service);
- goto more;
- }
- *cp++ = '\0';
- sep->se_rpcversl =
- sep->se_rpcversh = strtol(cp, &ccp, 0);
- if (ccp == cp) {
- badafterall:
- syslog(LOG_ERR, "%s/%s: bad rpc version",
- sep->se_service, cp);
- goto more;
- }
- if (*ccp == '-') {
- cp = ccp + 1;
- sep->se_rpcversh = strtol(cp, &ccp, 0);
- if (ccp == cp)
- goto badafterall;
- }
- #else
- syslog(LOG_ERR, "%s: rpc services not suported",
- sep->se_service);
- goto more;
- #endif RPC
- }
- }
- arg = skip(&cp);
- sep->se_wait = strcmp(arg, "wait") == 0;
- if (sep->se_wait == 0 && sep->se_family == AF_PTY) {
- syslog(LOG_ERR, "pty: only single threaded servers allowed: %s\n", sep->se_service);
- sep->se_wait = 1;
- }
- sep->se_user = strdup(skip(&cp));
- sep->se_server = strdup(skip(&cp));
- if (strcmp(sep->se_server, "internal") == 0) {
- register struct biltin *bi;
-
- for (bi = biltins; bi->bi_service; bi++)
- if (bi->bi_socktype == sep->se_socktype &&
- strcmp(bi->bi_service, sep->se_service) == 0)
- break;
- if (bi->bi_service == 0) {
- syslog(LOG_ERR, "internal service %s unknown\n",
- sep->se_service);
- goto more;
- }
- sep->se_bi = bi;
- sep->se_wait = bi->bi_wait;
- } else
- sep->se_bi = NULL;
- argc = 0;
- for (arg = skip(&cp); cp; arg = skip(&cp))
- if (argc < MAXARGV)
- sep->se_argv[argc++] = strdup(arg);
- while (argc <= MAXARGV)
- sep->se_argv[argc++] = NULL;
- return (sep);
- }
-
- freeconfig(cp)
- register struct servtab *cp;
- {
- int i;
-
- if (cp->se_service)
- free(cp->se_service);
- if (cp->se_proto)
- free(cp->se_proto);
- if (cp->se_user)
- free(cp->se_user);
- if (cp->se_server)
- free(cp->se_server);
- for (i = 0; i < MAXARGV; i++)
- if (cp->se_argv[i])
- free(cp->se_argv[i]);
- }
-
- char *
- skip(cpp)
- char **cpp;
- {
- register char *cp = *cpp;
- char *start;
-
- again:
- while (*cp == ' ' || *cp == '\t')
- cp++;
- if (*cp == '\0') {
- int c;
-
- c = getc(fconfig);
- (void) ungetc(c, fconfig);
- if (c == ' ' || c == '\t')
- if (cp = nextline(fconfig))
- goto again;
- *cpp = (char *)0;
- return ((char *)0);
- }
- start = cp;
- while (*cp && *cp != ' ' && *cp != '\t')
- cp++;
- if (*cp != '\0')
- *cp++ = '\0';
- *cpp = cp;
- return (start);
- }
-
- char *
- nextline(fd)
- FILE *fd;
- {
- char *cp;
-
- if (fgets(line, sizeof (line), fd) == NULL)
- return ((char *)0);
- cp = index(line, '\n');
- if (cp)
- *cp = '\0';
- return (line);
- }
-
- char *
- strdup(cp)
- char *cp;
- {
- char *new;
-
- if (cp == NULL)
- cp = "";
- new = malloc((unsigned)(strlen(cp) + 1));
- if (new == (char *)0) {
- syslog(LOG_ERR, "Out of memory.");
- exit(-1);
- }
- (void)strcpy(new, cp);
- return (new);
- }
-
- setproctitle(a, s)
- char *a;
- int s;
- {
- int size;
- register char *cp;
- struct sockaddr_in sin;
- char buf[80];
-
- cp = Argv[0];
- size = sizeof(sin);
- if (getpeername(s, &sin, &size) == 0)
- (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr));
- else
- (void) sprintf(buf, "-%s", a);
- strncpy(cp, buf, LastArg - cp);
- cp += strlen(cp);
- while (cp < LastArg)
- *cp++ = ' ';
- }
-
- logpid()
- {
- FILE *fp;
-
- if ((fp = fopen(PIDFILE, "w")) != NULL) {
- fprintf(fp, "%u\n", getpid());
- (void)fclose(fp);
- }
- }
-
- #ifdef sun
- bump_nofile()
- {
- struct rlimit rl;
-
- if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
- return -1;
- rl.rlim_cur = rl.rlim_max;
- if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
- return -1;
- return 0;
- }
- #endif
-
- /*
- * Internet services provided internally by inetd:
- */
- #define BUFSIZE 4096
-
- /* ARGSUSED */
- echo_stream(s, sep) /* Echo service -- echo data back */
- int s;
- struct servtab *sep;
- {
- char buffer[BUFSIZE];
- int i;
-
- setproctitle(sep->se_service, s);
- while ((i = read(s, buffer, sizeof(buffer))) > 0 &&
- write(s, buffer, i) > 0)
- ;
- exit(0);
- }
-
- /* ARGSUSED */
- echo_dg(s, sep) /* Echo service -- echo data back */
- int s;
- struct servtab *sep;
- {
- char buffer[BUFSIZE];
- int i, size;
- struct sockaddr sa;
-
- size = sizeof(sa);
- if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0)
- return;
- (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
- }
-
- /* ARGSUSED */
- discard_stream(s, sep) /* Discard service -- ignore data */
- int s;
- struct servtab *sep;
- {
- char buffer[BUFSIZE];
-
- setproctitle(sep->se_service, s);
- while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) ||
- errno == EINTR)
- ;
- exit(0);
- }
-
- /* ARGSUSED */
- discard_dg(s, sep) /* Discard service -- ignore data */
- int s;
- struct servtab *sep;
- {
- char buffer[BUFSIZE];
-
- (void) read(s, buffer, sizeof(buffer));
- }
-
- #include <ctype.h>
- #define LINESIZ 72
- char ring[128];
- char *endring;
-
- initring()
- {
- register int i;
-
- endring = ring;
-
- for (i = 0; i <= 128; ++i)
- if (isprint(i))
- *endring++ = i;
- }
-
- /* ARGSUSED */
- chargen_stream(s, sep) /* Character generator */
- int s;
- struct servtab *sep;
- {
- register char *rs;
- int len;
- char text[LINESIZ+2];
-
- setproctitle(sep->se_service, s);
-
- if (!endring) {
- initring();
- rs = ring;
- }
-
- text[LINESIZ] = '\r';
- text[LINESIZ + 1] = '\n';
- for (rs = ring;;) {
- if ((len = endring - rs) >= LINESIZ)
- bcopy(rs, text, LINESIZ);
- else {
- bcopy(rs, text, len);
- bcopy(ring, text + len, LINESIZ - len);
- }
- if (++rs == endring)
- rs = ring;
- if (write(s, text, sizeof(text)) != sizeof(text))
- break;
- }
- exit(0);
- }
-
- /* ARGSUSED */
- chargen_dg(s, sep) /* Character generator */
- int s;
- struct servtab *sep;
- {
- struct sockaddr sa;
- static char *rs;
- int len, size;
- char text[LINESIZ+2];
-
- if (endring == 0) {
- initring();
- rs = ring;
- }
-
- size = sizeof(sa);
- if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
- return;
-
- if ((len = endring - rs) >= LINESIZ)
- bcopy(rs, text, LINESIZ);
- else {
- bcopy(rs, text, len);
- bcopy(ring, text + len, LINESIZ - len);
- }
- if (++rs == endring)
- rs = ring;
- text[LINESIZ] = '\r';
- text[LINESIZ + 1] = '\n';
- (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
- }
-
- /*
- * Return a machine readable date and time, in the form of the
- * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
- * returns the number of seconds since midnight, Jan 1, 1970,
- * we must add 2208988800 seconds to this figure to make up for
- * some seventy years Bell Labs was asleep.
- */
-
- long
- machtime()
- {
- struct timeval tv;
-
- if (gettimeofday(&tv, (struct timezone *)0) < 0) {
- fprintf(stderr, "Unable to get time of day\n");
- return (0L);
- }
- return (htonl((long)tv.tv_sec + 2208988800));
- }
-
- /* ARGSUSED */
- machtime_stream(s, sep)
- int s;
- struct servtab *sep;
- {
- long result;
-
- result = machtime();
- (void) write(s, (char *) &result, sizeof(result));
- }
-
- /* ARGSUSED */
- machtime_dg(s, sep)
- int s;
- struct servtab *sep;
- {
- long result;
- struct sockaddr sa;
- int size;
-
- size = sizeof(sa);
- if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0)
- return;
- result = machtime();
- (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
- }
-
- /* ARGSUSED */
- daytime_stream(s, sep) /* Return human-readable time of day */
- int s;
- struct servtab *sep;
- {
- char buffer[256];
- time_t time(), clock;
- char *ctime();
-
- clock = time((time_t *) 0);
-
- (void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
- (void) write(s, buffer, strlen(buffer));
- }
-
- /* ARGSUSED */
- daytime_dg(s, sep) /* Return human-readable time of day */
- int s;
- struct servtab *sep;
- {
- char buffer[256];
- time_t time(), clock;
- struct sockaddr sa;
- int size;
- char *ctime();
-
- clock = time((time_t *) 0);
-
- size = sizeof(sa);
- if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
- return;
- (void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
- (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
- }
-
- /*
- * print_service:
- * Dump relevant information to stderr
- */
- print_service(action, sep)
- char *action;
- struct servtab *sep;
- {
- fprintf(stderr,
- "%s: %s proto=%s, wait=%d, user=%s builtin=%x server=%s\n",
- action, sep->se_service, sep->se_proto,
- sep->se_wait, sep->se_user, (int)sep->se_bi, sep->se_server);
- }
-