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-rw-r--r--lib/libc/net/rcmd.c761
1 files changed, 761 insertions, 0 deletions
diff --git a/lib/libc/net/rcmd.c b/lib/libc/net/rcmd.c
new file mode 100644
index 0000000..990289a
--- /dev/null
+++ b/lib/libc/net/rcmd.c
@@ -0,0 +1,761 @@
+/*
+ * Copyright (c) 1983, 1993, 1994
+ * The Regents of the University of California. 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.
+ * 4. 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 BY THE REGENTS 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 THE REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <signal.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <rpc/rpc.h>
+#ifdef YP
+#include <rpcsvc/yp_prot.h>
+#include <rpcsvc/ypclnt.h>
+#endif
+#include <arpa/nameser.h>
+#include "un-namespace.h"
+
+extern int innetgr( const char *, const char *, const char *, const char * );
+
+#define max(a, b) ((a > b) ? a : b)
+
+int __ivaliduser(FILE *, u_int32_t, const char *, const char *);
+int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int);
+int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *,
+ const char *);
+static int __icheckhost(const struct sockaddr *, socklen_t, const char *);
+
+char paddr[NI_MAXHOST];
+
+int
+rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
+ char **ahost;
+ u_short rport;
+ const char *locuser, *remuser, *cmd;
+ int *fd2p;
+{
+ return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
+}
+
+int
+rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
+ char **ahost;
+ u_short rport;
+ const char *locuser, *remuser, *cmd;
+ int *fd2p;
+ int af;
+{
+ struct addrinfo hints, *res, *ai;
+ struct sockaddr_storage from;
+ fd_set reads;
+ sigset_t oldmask, newmask;
+ pid_t pid;
+ int s, aport, lport, timo, error;
+ char c, *p;
+ int refused, nres;
+ char num[8];
+ static char canonnamebuf[MAXDNAME]; /* is it proper here? */
+
+ /* call rcmdsh() with specified remote shell if appropriate. */
+ if (!issetugid() && (p = getenv("RSH"))) {
+ struct servent *sp = getservbyname("shell", "tcp");
+
+ if (sp && sp->s_port == rport)
+ return (rcmdsh(ahost, rport, locuser, remuser,
+ cmd, p));
+ }
+
+ /* use rsh(1) if non-root and remote port is shell. */
+ if (geteuid()) {
+ struct servent *sp = getservbyname("shell", "tcp");
+
+ if (sp && sp->s_port == rport)
+ return (rcmdsh(ahost, rport, locuser, remuser,
+ cmd, NULL));
+ }
+
+ pid = getpid();
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_flags = AI_CANONNAME;
+ hints.ai_family = af;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = 0;
+ (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
+ error = getaddrinfo(*ahost, num, &hints, &res);
+ if (error) {
+ fprintf(stderr, "rcmd: getaddrinfo: %s\n",
+ gai_strerror(error));
+ if (error == EAI_SYSTEM)
+ fprintf(stderr, "rcmd: getaddrinfo: %s\n",
+ strerror(errno));
+ return (-1);
+ }
+
+ if (res->ai_canonname
+ && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
+ strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
+ *ahost = canonnamebuf;
+ }
+ nres = 0;
+ for (ai = res; ai; ai = ai->ai_next)
+ nres++;
+ ai = res;
+ refused = 0;
+ sigemptyset(&newmask);
+ sigaddset(&newmask, SIGURG);
+ _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
+ for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
+ s = rresvport_af(&lport, ai->ai_family);
+ if (s < 0) {
+ if (errno != EAGAIN && ai->ai_next) {
+ ai = ai->ai_next;
+ continue;
+ }
+ if (errno == EAGAIN)
+ (void)fprintf(stderr,
+ "rcmd: socket: All ports in use\n");
+ else
+ (void)fprintf(stderr, "rcmd: socket: %s\n",
+ strerror(errno));
+ freeaddrinfo(res);
+ _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
+ NULL);
+ return (-1);
+ }
+ _fcntl(s, F_SETOWN, pid);
+ if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
+ break;
+ (void)_close(s);
+ if (errno == EADDRINUSE) {
+ lport--;
+ continue;
+ }
+ if (errno == ECONNREFUSED)
+ refused = 1;
+ if (ai->ai_next == NULL && (!refused || timo > 16)) {
+ (void)fprintf(stderr, "%s: %s\n",
+ *ahost, strerror(errno));
+ freeaddrinfo(res);
+ _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
+ NULL);
+ return (-1);
+ }
+ if (nres > 1) {
+ int oerrno = errno;
+
+ getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
+ sizeof(paddr), NULL, 0, NI_NUMERICHOST);
+ (void)fprintf(stderr, "connect to address %s: ",
+ paddr);
+ errno = oerrno;
+ perror(0);
+ }
+ if ((ai = ai->ai_next) == NULL) {
+ /* refused && timo <= 16 */
+ struct timespec time_to_sleep, time_remaining;
+
+ time_to_sleep.tv_sec = timo;
+ time_to_sleep.tv_nsec = 0;
+ (void)_nanosleep(&time_to_sleep, &time_remaining);
+ timo *= 2;
+ ai = res;
+ refused = 0;
+ }
+ if (nres > 1) {
+ getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
+ sizeof(paddr), NULL, 0, NI_NUMERICHOST);
+ fprintf(stderr, "Trying %s...\n", paddr);
+ }
+ }
+ lport--;
+ if (fd2p == 0) {
+ _write(s, "", 1);
+ lport = 0;
+ } else {
+ int s2 = rresvport_af(&lport, ai->ai_family), s3;
+ socklen_t len = ai->ai_addrlen;
+ int nfds;
+
+ if (s2 < 0)
+ goto bad;
+ _listen(s2, 1);
+ (void)snprintf(num, sizeof(num), "%d", lport);
+ if (_write(s, num, strlen(num)+1) != strlen(num)+1) {
+ (void)fprintf(stderr,
+ "rcmd: write (setting up stderr): %s\n",
+ strerror(errno));
+ (void)_close(s2);
+ goto bad;
+ }
+ nfds = max(s, s2)+1;
+ if(nfds > FD_SETSIZE) {
+ fprintf(stderr, "rcmd: too many files\n");
+ (void)_close(s2);
+ goto bad;
+ }
+again:
+ FD_ZERO(&reads);
+ FD_SET(s, &reads);
+ FD_SET(s2, &reads);
+ errno = 0;
+ if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
+ if (errno != 0)
+ (void)fprintf(stderr,
+ "rcmd: select (setting up stderr): %s\n",
+ strerror(errno));
+ else
+ (void)fprintf(stderr,
+ "select: protocol failure in circuit setup\n");
+ (void)_close(s2);
+ goto bad;
+ }
+ s3 = _accept(s2, (struct sockaddr *)&from, &len);
+ switch (from.ss_family) {
+ case AF_INET:
+ aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
+ break;
+#ifdef INET6
+ case AF_INET6:
+ aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
+ break;
+#endif
+ default:
+ aport = 0; /* error */
+ break;
+ }
+ /*
+ * XXX careful for ftp bounce attacks. If discovered, shut them
+ * down and check for the real auxiliary channel to connect.
+ */
+ if (aport == 20) {
+ _close(s3);
+ goto again;
+ }
+ (void)_close(s2);
+ if (s3 < 0) {
+ (void)fprintf(stderr,
+ "rcmd: accept: %s\n", strerror(errno));
+ lport = 0;
+ goto bad;
+ }
+ *fd2p = s3;
+ if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
+ (void)fprintf(stderr,
+ "socket: protocol failure in circuit setup.\n");
+ goto bad2;
+ }
+ }
+ (void)_write(s, locuser, strlen(locuser)+1);
+ (void)_write(s, remuser, strlen(remuser)+1);
+ (void)_write(s, cmd, strlen(cmd)+1);
+ if (_read(s, &c, 1) != 1) {
+ (void)fprintf(stderr,
+ "rcmd: %s: %s\n", *ahost, strerror(errno));
+ goto bad2;
+ }
+ if (c != 0) {
+ while (_read(s, &c, 1) == 1) {
+ (void)_write(STDERR_FILENO, &c, 1);
+ if (c == '\n')
+ break;
+ }
+ goto bad2;
+ }
+ _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
+ freeaddrinfo(res);
+ return (s);
+bad2:
+ if (lport)
+ (void)_close(*fd2p);
+bad:
+ (void)_close(s);
+ _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
+ freeaddrinfo(res);
+ return (-1);
+}
+
+int
+rresvport(port)
+ int *port;
+{
+ return rresvport_af(port, AF_INET);
+}
+
+int
+rresvport_af(alport, family)
+ int *alport, family;
+{
+ int s;
+ struct sockaddr_storage ss;
+ u_short *sport;
+
+ memset(&ss, 0, sizeof(ss));
+ ss.ss_family = family;
+ switch (family) {
+ case AF_INET:
+ ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
+ sport = &((struct sockaddr_in *)&ss)->sin_port;
+ ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
+ break;
+#ifdef INET6
+ case AF_INET6:
+ ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
+ sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
+ ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
+ break;
+#endif
+ default:
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ s = _socket(ss.ss_family, SOCK_STREAM, 0);
+ if (s < 0)
+ return (-1);
+#if 0 /* compat_exact_traditional_rresvport_semantics */
+ sin.sin_port = htons((u_short)*alport);
+ if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
+ return (s);
+ if (errno != EADDRINUSE) {
+ (void)_close(s);
+ return (-1);
+ }
+#endif
+ *sport = 0;
+ if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
+ (void)_close(s);
+ return (-1);
+ }
+ *alport = (int)ntohs(*sport);
+ return (s);
+}
+
+int __check_rhosts_file = 1;
+char *__rcmd_errstr;
+
+int
+ruserok(rhost, superuser, ruser, luser)
+ const char *rhost, *ruser, *luser;
+ int superuser;
+{
+ struct addrinfo hints, *res, *r;
+ int error;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = PF_UNSPEC;
+ hints.ai_socktype = SOCK_DGRAM; /*dummy*/
+ error = getaddrinfo(rhost, "0", &hints, &res);
+ if (error)
+ return (-1);
+
+ for (r = res; r; r = r->ai_next) {
+ if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
+ luser) == 0) {
+ freeaddrinfo(res);
+ return (0);
+ }
+ }
+ freeaddrinfo(res);
+ return (-1);
+}
+
+/*
+ * New .rhosts strategy: We are passed an ip address. We spin through
+ * hosts.equiv and .rhosts looking for a match. When the .rhosts only
+ * has ip addresses, we don't have to trust a nameserver. When it
+ * contains hostnames, we spin through the list of addresses the nameserver
+ * gives us and look for a match.
+ *
+ * Returns 0 if ok, -1 if not ok.
+ */
+int
+iruserok(raddr, superuser, ruser, luser)
+ unsigned long raddr;
+ int superuser;
+ const char *ruser, *luser;
+{
+ struct sockaddr_in sin;
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_len = sizeof(struct sockaddr_in);
+ memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
+ return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
+ ruser, luser);
+}
+
+/*
+ * AF independent extension of iruserok.
+ *
+ * Returns 0 if ok, -1 if not ok.
+ */
+int
+iruserok_sa(ra, rlen, superuser, ruser, luser)
+ const void *ra;
+ int rlen;
+ int superuser;
+ const char *ruser, *luser;
+{
+ char *cp;
+ struct stat sbuf;
+ struct passwd *pwd;
+ FILE *hostf;
+ uid_t uid;
+ int first;
+ char pbuf[MAXPATHLEN];
+ const struct sockaddr *raddr;
+ struct sockaddr_storage ss;
+
+ /* avoid alignment issue */
+ if (rlen > sizeof(ss))
+ return(-1);
+ memcpy(&ss, ra, rlen);
+ raddr = (struct sockaddr *)&ss;
+
+ first = 1;
+ hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
+again:
+ if (hostf) {
+ if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
+ (void)fclose(hostf);
+ return (0);
+ }
+ (void)fclose(hostf);
+ }
+ if (first == 1 && (__check_rhosts_file || superuser)) {
+ first = 0;
+ if ((pwd = getpwnam(luser)) == NULL)
+ return (-1);
+ (void)strcpy(pbuf, pwd->pw_dir);
+ (void)strcat(pbuf, "/.rhosts");
+
+ /*
+ * Change effective uid while opening .rhosts. If root and
+ * reading an NFS mounted file system, can't read files that
+ * are protected read/write owner only.
+ */
+ uid = geteuid();
+ (void)seteuid(pwd->pw_uid);
+ hostf = fopen(pbuf, "r");
+ (void)seteuid(uid);
+
+ if (hostf == NULL)
+ return (-1);
+ /*
+ * If not a regular file, or is owned by someone other than
+ * user or root or if writeable by anyone but the owner, quit.
+ */
+ cp = NULL;
+ if (lstat(pbuf, &sbuf) < 0)
+ cp = ".rhosts lstat failed";
+ else if (!S_ISREG(sbuf.st_mode))
+ cp = ".rhosts not regular file";
+ else if (_fstat(fileno(hostf), &sbuf) < 0)
+ cp = ".rhosts fstat failed";
+ else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
+ cp = "bad .rhosts owner";
+ else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
+ cp = ".rhosts writeable by other than owner";
+ /* If there were any problems, quit. */
+ if (cp) {
+ __rcmd_errstr = cp;
+ (void)fclose(hostf);
+ return (-1);
+ }
+ goto again;
+ }
+ return (-1);
+}
+
+/*
+ * XXX
+ * Don't make static, used by lpd(8).
+ *
+ * Returns 0 if ok, -1 if not ok.
+ */
+int
+__ivaliduser(hostf, raddr, luser, ruser)
+ FILE *hostf;
+ u_int32_t raddr;
+ const char *luser, *ruser;
+{
+ struct sockaddr_in sin;
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_len = sizeof(struct sockaddr_in);
+ memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
+ return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
+ luser, ruser);
+}
+
+/*
+ * Returns 0 if ok, -1 if not ok.
+ *
+ * XXX obsolete API.
+ */
+int
+__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
+ FILE *hostf;
+ const void *raddr;
+ const char *luser, *ruser;
+ int af, len;
+{
+ struct sockaddr *sa = NULL;
+ struct sockaddr_in *sin = NULL;
+#ifdef INET6
+ struct sockaddr_in6 *sin6 = NULL;
+#endif
+ struct sockaddr_storage ss;
+
+ memset(&ss, 0, sizeof(ss));
+ switch (af) {
+ case AF_INET:
+ if (len != sizeof(sin->sin_addr))
+ return -1;
+ sin = (struct sockaddr_in *)&ss;
+ sin->sin_family = AF_INET;
+ sin->sin_len = sizeof(struct sockaddr_in);
+ memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
+ break;
+#ifdef INET6
+ case AF_INET6:
+ if (len != sizeof(sin6->sin6_addr))
+ return -1;
+ /* you will lose scope info */
+ sin6 = (struct sockaddr_in6 *)&ss;
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_len = sizeof(struct sockaddr_in6);
+ memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
+ break;
+#endif
+ default:
+ return -1;
+ }
+
+ sa = (struct sockaddr *)&ss;
+ return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
+}
+
+int
+__ivaliduser_sa(hostf, raddr, salen, luser, ruser)
+ FILE *hostf;
+ const struct sockaddr *raddr;
+ socklen_t salen;
+ const char *luser, *ruser;
+{
+ char *user, *p;
+ int ch;
+ char buf[MAXHOSTNAMELEN + 128]; /* host + login */
+ char hname[MAXHOSTNAMELEN];
+ /* Presumed guilty until proven innocent. */
+ int userok = 0, hostok = 0;
+#ifdef YP
+ char *ypdomain;
+
+ if (yp_get_default_domain(&ypdomain))
+ ypdomain = NULL;
+#else
+#define ypdomain NULL
+#endif
+ /* We need to get the damn hostname back for netgroup matching. */
+ if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0,
+ NI_NAMEREQD) != 0)
+ hname[0] = '\0';
+
+ while (fgets(buf, sizeof(buf), hostf)) {
+ p = buf;
+ /* Skip lines that are too long. */
+ if (strchr(p, '\n') == NULL) {
+ while ((ch = getc(hostf)) != '\n' && ch != EOF);
+ continue;
+ }
+ if (*p == '\n' || *p == '#') {
+ /* comment... */
+ continue;
+ }
+ while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
+ *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
+ p++;
+ }
+ if (*p == ' ' || *p == '\t') {
+ *p++ = '\0';
+ while (*p == ' ' || *p == '\t')
+ p++;
+ user = p;
+ while (*p != '\n' && *p != ' ' &&
+ *p != '\t' && *p != '\0')
+ p++;
+ } else
+ user = p;
+ *p = '\0';
+ /*
+ * Do +/- and +@/-@ checking. This looks really nasty,
+ * but it matches SunOS's behavior so far as I can tell.
+ */
+ switch(buf[0]) {
+ case '+':
+ if (!buf[1]) { /* '+' matches all hosts */
+ hostok = 1;
+ break;
+ }
+ if (buf[1] == '@') /* match a host by netgroup */
+ hostok = hname[0] != '\0' &&
+ innetgr(&buf[2], hname, NULL, ypdomain);
+ else /* match a host by addr */
+ hostok = __icheckhost(raddr, salen,
+ (char *)&buf[1]);
+ break;
+ case '-': /* reject '-' hosts and all their users */
+ if (buf[1] == '@') {
+ if (hname[0] == '\0' ||
+ innetgr(&buf[2], hname, NULL, ypdomain))
+ return(-1);
+ } else {
+ if (__icheckhost(raddr, salen,
+ (char *)&buf[1]))
+ return(-1);
+ }
+ break;
+ default: /* if no '+' or '-', do a simple match */
+ hostok = __icheckhost(raddr, salen, buf);
+ break;
+ }
+ switch(*user) {
+ case '+':
+ if (!*(user+1)) { /* '+' matches all users */
+ userok = 1;
+ break;
+ }
+ if (*(user+1) == '@') /* match a user by netgroup */
+ userok = innetgr(user+2, NULL, ruser, ypdomain);
+ else /* match a user by direct specification */
+ userok = !(strcmp(ruser, user+1));
+ break;
+ case '-': /* if we matched a hostname, */
+ if (hostok) { /* check for user field rejections */
+ if (!*(user+1))
+ return(-1);
+ if (*(user+1) == '@') {
+ if (innetgr(user+2, NULL,
+ ruser, ypdomain))
+ return(-1);
+ } else {
+ if (!strcmp(ruser, user+1))
+ return(-1);
+ }
+ }
+ break;
+ default: /* no rejections: try to match the user */
+ if (hostok)
+ userok = !(strcmp(ruser,*user ? user : luser));
+ break;
+ }
+ if (hostok && userok)
+ return(0);
+ }
+ return (-1);
+}
+
+/*
+ * Returns "true" if match, 0 if no match.
+ */
+static int
+__icheckhost(raddr, salen, lhost)
+ const struct sockaddr *raddr;
+ socklen_t salen;
+ const char *lhost;
+{
+ struct sockaddr_in sin;
+ struct sockaddr_in6 *sin6;
+ struct addrinfo hints, *res, *r;
+ int error;
+ char h1[NI_MAXHOST], h2[NI_MAXHOST];
+
+ if (raddr->sa_family == AF_INET6) {
+ sin6 = (struct sockaddr_in6 *)raddr;
+ if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_len = sizeof(struct sockaddr_in);
+ memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
+ sizeof(sin.sin_addr));
+ raddr = (struct sockaddr *)&sin;
+ salen = sin.sin_len;
+ }
+ }
+
+ h1[0] = '\0';
+ if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
+ NI_NUMERICHOST) != 0)
+ return (0);
+
+ /* Resolve laddr into sockaddr */
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = raddr->sa_family;
+ hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
+ res = NULL;
+ error = getaddrinfo(lhost, "0", &hints, &res);
+ if (error)
+ return (0);
+
+ for (r = res; r ; r = r->ai_next) {
+ h2[0] = '\0';
+ if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
+ NULL, 0, NI_NUMERICHOST) != 0)
+ continue;
+ if (strcmp(h1, h2) == 0) {
+ freeaddrinfo(res);
+ return (1);
+ }
+ }
+
+ /* No match. */
+ freeaddrinfo(res);
+ return (0);
+}
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