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Diffstat (limited to 'usr.sbin/ypserv/yp_main.c')
-rw-r--r--usr.sbin/ypserv/yp_main.c578
1 files changed, 578 insertions, 0 deletions
diff --git a/usr.sbin/ypserv/yp_main.c b/usr.sbin/ypserv/yp_main.c
new file mode 100644
index 000000000000..d326603a9229
--- /dev/null
+++ b/usr.sbin/ypserv/yp_main.c
@@ -0,0 +1,578 @@
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
+ * Copyright (c) 1995
+ * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Bill Paul.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+/*
+ * ypserv startup function.
+ * We need out own main() since we have to do some additional work
+ * that rpcgen won't do for us. Most of this file was generated using
+ * rpcgen.new, and later modified.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include "yp.h"
+#include <err.h>
+#include <errno.h>
+#include <memory.h>
+#include <stdio.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdlib.h> /* getenv, exit */
+#include <string.h> /* strcmp */
+#include <syslog.h>
+#include <unistd.h>
+#ifdef __cplusplus
+#include <sysent.h> /* getdtablesize, open */
+#endif /* __cplusplus */
+#include <netinet/in.h>
+#include <netdb.h>
+#include "yp_extern.h"
+#include <netconfig.h>
+#include <rpc/rpc.h>
+#include <rpc/rpc_com.h>
+
+#ifndef SIG_PF
+#define SIG_PF void(*)(int)
+#endif
+
+#define _RPCSVC_CLOSEDOWN 120
+int _rpcpmstart; /* Started by a port monitor ? */
+static int _rpcfdtype; /* Whether Stream or Datagram? */
+static int _rpcaf;
+static int _rpcfd;
+
+/* States a server can be in wrt request */
+#define _IDLE 0
+#define _SERVED 1
+#define _SERVING 2
+
+extern void ypprog_1(struct svc_req *, SVCXPRT *);
+extern void ypprog_2(struct svc_req *, SVCXPRT *);
+extern int _rpc_dtablesize(void);
+extern int _rpcsvcstate; /* Set when a request is serviced */
+char *progname = "ypserv";
+char *yp_dir = _PATH_YP;
+int debug;
+int do_dns = 0;
+int resfd;
+
+struct socklistent {
+ int sle_sock;
+ struct sockaddr_storage sle_ss;
+ SLIST_ENTRY(socklistent) sle_next;
+};
+static SLIST_HEAD(, socklistent) sle_head =
+ SLIST_HEAD_INITIALIZER(sle_head);
+
+struct bindaddrlistent {
+ const char *ble_hostname;
+ SLIST_ENTRY(bindaddrlistent) ble_next;
+};
+static SLIST_HEAD(, bindaddrlistent) ble_head =
+ SLIST_HEAD_INITIALIZER(ble_head);
+
+static char *servname = "0";
+
+static
+void _msgout(char* msg, ...)
+{
+ va_list ap;
+
+ va_start(ap, msg);
+ if (debug) {
+ if (_rpcpmstart)
+ vsyslog(LOG_ERR, msg, ap);
+ else
+ vwarnx(msg, ap);
+ } else
+ vsyslog(LOG_ERR, msg, ap);
+ va_end(ap);
+}
+
+pid_t yp_pid;
+
+static void
+yp_svc_run(void)
+{
+#ifdef FD_SETSIZE
+ fd_set readfds;
+#else
+ int readfds;
+#endif /* def FD_SETSIZE */
+ int fd_setsize = _rpc_dtablesize();
+ struct timeval timeout;
+
+ /* Establish the identity of the parent ypserv process. */
+ yp_pid = getpid();
+
+ for (;;) {
+#ifdef FD_SETSIZE
+ readfds = svc_fdset;
+#else
+ readfds = svc_fds;
+#endif /* def FD_SETSIZE */
+
+ FD_SET(resfd, &readfds);
+
+ timeout.tv_sec = RESOLVER_TIMEOUT;
+ timeout.tv_usec = 0;
+ switch (select(fd_setsize, &readfds, NULL, NULL,
+ &timeout)) {
+ case -1:
+ if (errno == EINTR) {
+ continue;
+ }
+ warn("svc_run: - select failed");
+ return;
+ case 0:
+ if (getpid() == yp_pid)
+ yp_prune_dnsq();
+ break;
+ default:
+ if (getpid() == yp_pid) {
+ if (FD_ISSET(resfd, &readfds)) {
+ yp_run_dnsq();
+ FD_CLR(resfd, &readfds);
+ }
+ svc_getreqset(&readfds);
+ }
+ }
+ if (yp_pid != getpid())
+ _exit(0);
+ }
+}
+
+static void
+unregister(void)
+{
+ (void)svc_unreg(YPPROG, YPVERS);
+ (void)svc_unreg(YPPROG, YPOLDVERS);
+}
+
+static void
+reaper(int sig)
+{
+ int status;
+ int saved_errno;
+
+ saved_errno = errno;
+
+ if (sig == SIGHUP) {
+ load_securenets();
+#ifdef DB_CACHE
+ yp_flush_all();
+#endif
+ errno = saved_errno;
+ return;
+ }
+
+ if (sig == SIGCHLD) {
+ while (wait3(&status, WNOHANG, NULL) > 0)
+ children--;
+ } else {
+ unregister();
+ exit(0);
+ }
+ errno = saved_errno;
+}
+
+static void
+usage(void)
+{
+ fprintf(stderr, "usage: ypserv [-h addr] [-d] [-n] [-p path] [-P port]\n");
+ exit(1);
+}
+
+static void
+closedown(int sig)
+{
+ if (_rpcsvcstate == _IDLE) {
+ extern fd_set svc_fdset;
+ static int size;
+ int i, openfd;
+
+ if (_rpcfdtype == SOCK_DGRAM) {
+ unregister();
+ exit(0);
+ }
+ if (size == 0) {
+ size = getdtablesize();
+ }
+ for (i = 0, openfd = 0; i < size && openfd < 2; i++)
+ if (FD_ISSET(i, &svc_fdset))
+ openfd++;
+ if (openfd <= 1) {
+ unregister();
+ exit(0);
+ }
+ }
+ if (_rpcsvcstate == _SERVED)
+ _rpcsvcstate = _IDLE;
+
+ (void) signal(SIGALRM, (SIG_PF) closedown);
+ (void) alarm(_RPCSVC_CLOSEDOWN/2);
+}
+
+static int
+create_service(const int sock, const struct netconfig *nconf,
+ const struct __rpc_sockinfo *si)
+{
+ int error;
+
+ SVCXPRT *transp;
+ struct addrinfo hints, *res, *res0;
+ struct socklistent *slep;
+ struct bindaddrlistent *blep;
+ struct netbuf svcaddr;
+
+ SLIST_INIT(&sle_head);
+ memset(&hints, 0, sizeof(hints));
+ memset(&svcaddr, 0, sizeof(svcaddr));
+
+ hints.ai_family = si->si_af;
+ hints.ai_socktype = si->si_socktype;
+ hints.ai_protocol = si->si_proto;
+
+ /*
+ * Build socketlist from bindaddrlist.
+ */
+ if (sock == RPC_ANYFD) {
+ SLIST_FOREACH(blep, &ble_head, ble_next) {
+ if (blep->ble_hostname == NULL)
+ hints.ai_flags = AI_PASSIVE;
+ else
+ hints.ai_flags = 0;
+ error = getaddrinfo(blep->ble_hostname, servname,
+ &hints, &res0);
+ if (error) {
+ _msgout("getaddrinfo(): %s",
+ gai_strerror(error));
+ return -1;
+ }
+ for (res = res0; res; res = res->ai_next) {
+ int s;
+
+ s = __rpc_nconf2fd(nconf);
+ if (s < 0) {
+ if (errno == EAFNOSUPPORT)
+ _msgout("unsupported"
+ " transport: %s",
+ nconf->nc_netid);
+ else
+ _msgout("cannot create"
+ " %s socket: %s",
+ nconf->nc_netid,
+ strerror(errno));
+ freeaddrinfo(res0);
+ return -1;
+ }
+ if (bindresvport_sa(s, res->ai_addr) == -1) {
+ if ((errno != EPERM) ||
+ (bind(s, res->ai_addr,
+ res->ai_addrlen) == -1)) {
+ _msgout("cannot bind "
+ "%s socket: %s",
+ nconf->nc_netid,
+ strerror(errno));
+ freeaddrinfo(res0);
+ close(sock);
+ return -1;
+ }
+ }
+ if (nconf->nc_semantics != NC_TPI_CLTS)
+ listen(s, SOMAXCONN);
+
+ slep = malloc(sizeof(*slep));
+ if (slep == NULL) {
+ _msgout("malloc failed: %s",
+ strerror(errno));
+ freeaddrinfo(res0);
+ close(s);
+ return -1;
+ }
+ memset(slep, 0, sizeof(*slep));
+ memcpy(&slep->sle_ss, res->ai_addr,
+ res->ai_addrlen);
+ slep->sle_sock = s;
+ SLIST_INSERT_HEAD(&sle_head, slep, sle_next);
+
+ /*
+ * If servname == "0", redefine it by using
+ * the bound socket.
+ */
+ if (strncmp("0", servname, 1) == 0) {
+ struct sockaddr *sap;
+ socklen_t slen;
+ char *sname;
+
+ sname = malloc(NI_MAXSERV);
+ if (sname == NULL) {
+ _msgout("malloc(): %s",
+ strerror(errno));
+ freeaddrinfo(res0);
+ close(s);
+ return -1;
+ }
+ memset(sname, 0, NI_MAXSERV);
+
+ sap = (struct sockaddr *)&slep->sle_ss;
+ slen = sizeof(*sap);
+ error = getsockname(s, sap, &slen);
+ if (error) {
+ _msgout("getsockname(): %s",
+ strerror(errno));
+ freeaddrinfo(res0);
+ close(s);
+ free(sname);
+ return -1;
+ }
+ error = getnameinfo(sap, slen,
+ NULL, 0,
+ sname, NI_MAXSERV,
+ NI_NUMERICHOST | NI_NUMERICSERV);
+ if (error) {
+ _msgout("getnameinfo(): %s",
+ strerror(errno));
+ freeaddrinfo(res0);
+ close(s);
+ free(sname);
+ return -1;
+ }
+ servname = sname;
+ }
+ }
+ freeaddrinfo(res0);
+ }
+ } else {
+ slep = malloc(sizeof(*slep));
+ if (slep == NULL) {
+ _msgout("malloc failed: %s", strerror(errno));
+ return -1;
+ }
+ memset(slep, 0, sizeof(*slep));
+ slep->sle_sock = sock;
+ SLIST_INSERT_HEAD(&sle_head, slep, sle_next);
+ }
+
+ /*
+ * Traverse socketlist and create rpc service handles for each socket.
+ */
+ SLIST_FOREACH(slep, &sle_head, sle_next) {
+ if (nconf->nc_semantics == NC_TPI_CLTS)
+ transp = svc_dg_create(slep->sle_sock, 0, 0);
+ else
+ transp = svc_vc_create(slep->sle_sock, RPC_MAXDATASIZE,
+ RPC_MAXDATASIZE);
+ if (transp == NULL) {
+ _msgout("unable to create service: %s",
+ nconf->nc_netid);
+ continue;
+ }
+ if (!svc_reg(transp, YPPROG, YPOLDVERS, ypprog_1, NULL)) {
+ svc_destroy(transp);
+ close(slep->sle_sock);
+ _msgout("unable to register (YPPROG, YPOLDVERS, %s):"
+ " %s", nconf->nc_netid, strerror(errno));
+ continue;
+ }
+ if (!svc_reg(transp, YPPROG, YPVERS, ypprog_2, NULL)) {
+ svc_destroy(transp);
+ close(slep->sle_sock);
+ _msgout("unable to register (YPPROG, YPVERS, %s): %s",
+ nconf->nc_netid, strerror(errno));
+ continue;
+ }
+ }
+ while(!(SLIST_EMPTY(&sle_head)))
+ SLIST_REMOVE_HEAD(&sle_head, sle_next);
+
+ /*
+ * Register RPC service to rpcbind by using AI_PASSIVE address.
+ */
+ hints.ai_flags = AI_PASSIVE;
+ error = getaddrinfo(NULL, servname, &hints, &res0);
+ if (error) {
+ _msgout("getaddrinfo(): %s", gai_strerror(error));
+ return -1;
+ }
+ svcaddr.buf = res0->ai_addr;
+ svcaddr.len = res0->ai_addrlen;
+
+ if (si->si_af == AF_INET) {
+ /* XXX: ignore error intentionally */
+ rpcb_set(YPPROG, YPOLDVERS, nconf, &svcaddr);
+ }
+ /* XXX: ignore error intentionally */
+ rpcb_set(YPPROG, YPVERS, nconf, &svcaddr);
+ freeaddrinfo(res0);
+ return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+ int ch;
+ int error;
+ int ntrans;
+
+ void *nc_handle;
+ struct netconfig *nconf;
+ struct __rpc_sockinfo si;
+ struct bindaddrlistent *blep;
+
+ memset(&si, 0, sizeof(si));
+ SLIST_INIT(&ble_head);
+
+ while ((ch = getopt(argc, argv, "dh:np:P:")) != -1) {
+ switch (ch) {
+ case 'd':
+ debug = ypdb_debug = 1;
+ break;
+ case 'h':
+ blep = malloc(sizeof(*blep));
+ if (blep == NULL)
+ err(1, "malloc() failed: -h %s", optarg);
+ blep->ble_hostname = optarg;
+ SLIST_INSERT_HEAD(&ble_head, blep, ble_next);
+ break;
+ case 'n':
+ do_dns = 1;
+ break;
+ case 'p':
+ yp_dir = optarg;
+ break;
+ case 'P':
+ servname = optarg;
+ break;
+ default:
+ usage();
+ }
+ }
+ /*
+ * Add "anyaddr" entry if no -h is specified.
+ */
+ if (SLIST_EMPTY(&ble_head)) {
+ blep = malloc(sizeof(*blep));
+ if (blep == NULL)
+ err(1, "malloc() failed");
+ memset(blep, 0, sizeof(*blep));
+ SLIST_INSERT_HEAD(&ble_head, blep, ble_next);
+ }
+
+ load_securenets();
+ yp_init_resolver();
+#ifdef DB_CACHE
+ yp_init_dbs();
+#endif
+ nc_handle = setnetconfig();
+ if (nc_handle == NULL)
+ err(1, "cannot read %s", NETCONFIG);
+ if (__rpc_fd2sockinfo(0, &si) != 0) {
+ /* invoked from inetd */
+ _rpcpmstart = 1;
+ _rpcfdtype = si.si_socktype;
+ _rpcaf = si.si_af;
+ _rpcfd = 0;
+ openlog("ypserv", LOG_PID, LOG_DAEMON);
+ } else {
+ /* standalone mode */
+ if (!debug) {
+ if (daemon(0,0)) {
+ err(1,"cannot fork");
+ }
+ openlog("ypserv", LOG_PID, LOG_DAEMON);
+ }
+ _rpcpmstart = 0;
+ _rpcaf = AF_INET;
+ _rpcfd = RPC_ANYFD;
+ unregister();
+ }
+
+ if (madvise(NULL, 0, MADV_PROTECT) != 0)
+ _msgout("madvise(): %s", strerror(errno));
+
+ /*
+ * Create RPC service for each transport.
+ */
+ ntrans = 0;
+ while((nconf = getnetconfig(nc_handle))) {
+ if ((nconf->nc_flag & NC_VISIBLE)) {
+ if (__rpc_nconf2sockinfo(nconf, &si) == 0) {
+ _msgout("cannot get information for %s. "
+ "Ignored.", nconf->nc_netid);
+ continue;
+ }
+ if (_rpcpmstart) {
+ if (si.si_socktype != _rpcfdtype ||
+ si.si_af != _rpcaf)
+ continue;
+ } else if (si.si_af != _rpcaf)
+ continue;
+ error = create_service(_rpcfd, nconf, &si);
+ if (error) {
+ endnetconfig(nc_handle);
+ exit(1);
+ }
+ ntrans++;
+ }
+ }
+ endnetconfig(nc_handle);
+ while(!(SLIST_EMPTY(&ble_head)))
+ SLIST_REMOVE_HEAD(&ble_head, ble_next);
+ if (ntrans == 0) {
+ _msgout("no transport is available. Aborted.");
+ exit(1);
+ }
+ if (_rpcpmstart) {
+ (void) signal(SIGALRM, (SIG_PF) closedown);
+ (void) alarm(_RPCSVC_CLOSEDOWN/2);
+ }
+/*
+ * Make sure SIGPIPE doesn't blow us away while servicing TCP
+ * connections.
+ */
+ (void) signal(SIGPIPE, SIG_IGN);
+ (void) signal(SIGCHLD, (SIG_PF) reaper);
+ (void) signal(SIGTERM, (SIG_PF) reaper);
+ (void) signal(SIGINT, (SIG_PF) reaper);
+ (void) signal(SIGHUP, (SIG_PF) reaper);
+ yp_svc_run();
+ _msgout("svc_run returned");
+ exit(1);
+ /* NOTREACHED */
+}
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