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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [rcmd.c] - Blame information for rev 279

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/*
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 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.
 *
 *  $Id: rcmd.c,v 1.2 2001-09-27 12:01:53 chris Exp $
 */
 
#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/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 <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#endif
 
extern int innetgr __P(( const char *, const char *, const char *, const char * ));
 
#define max(a, b)       ((a > b) ? a : b)
 
int     __ivaliduser __P((FILE *, u_long, const char *, const char *));
static int __icheckhost __P((u_long, char *));
 
int
rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
        char **ahost;
        u_short rport;
        const char *locuser, *remuser, *cmd;
        int *fd2p;
{
        struct hostent *hp;
        struct sockaddr_in sin, from;
        fd_set reads;
        long oldmask;
        pid_t pid;
        int s, lport, timo;
        char c;
 
        pid = getpid();
        hp = gethostbyname(*ahost);
        if (hp == NULL) {
                herror(*ahost);
                return (-1);
        }
        *ahost = hp->h_name;
        oldmask = sigblock(sigmask(SIGURG));
        for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
                s = rresvport(&lport);
                if (s < 0) {
                        if (errno == EAGAIN)
                                (void)fprintf(stderr,
                                    "rcmd: socket: All ports in use\n");
                        else
                                (void)fprintf(stderr, "rcmd: socket: %s\n",
                                    strerror(errno));
                        sigsetmask(oldmask);
                        return (-1);
                }
                fcntl(s, F_SETOWN, pid);
                bzero(&sin, sizeof sin);
                sin.sin_len = sizeof(struct sockaddr_in);
                sin.sin_family = hp->h_addrtype;
                sin.sin_port = rport;
                bcopy(hp->h_addr_list[0], &sin.sin_addr, MIN(hp->h_length, sizeof sin.sin_addr));
                if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
                        break;
                (void)close(s);
                if (errno == EADDRINUSE) {
                        lport--;
                        continue;
                }
                if (errno == ECONNREFUSED && timo <= 16) {
                        (void)sleep(timo);
                        timo *= 2;
                        continue;
                }
                if (hp->h_addr_list[1] != NULL) {
                        int oerrno = errno;
 
                        (void)fprintf(stderr, "connect to address %s: ",
                            inet_ntoa(sin.sin_addr));
                        errno = oerrno;
                        perror(0);
                        hp->h_addr_list++;
                        bcopy(hp->h_addr_list[0], &sin.sin_addr, MIN(hp->h_length, sizeof sin.sin_addr));
                        (void)fprintf(stderr, "Trying %s...\n",
                            inet_ntoa(sin.sin_addr));
                        continue;
                }
                (void)fprintf(stderr, "%s: %s\n", hp->h_name, strerror(errno));
                sigsetmask(oldmask);
                return (-1);
        }
        lport--;
        if (fd2p == 0) {
                write(s, "", 1);
                lport = 0;
        } else {
                char num[8];
                int s2 = rresvport(&lport), s3;
                int len = sizeof(from);
                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);
                /*
                 * XXX careful for ftp bounce attacks. If discovered, shut them
                 * down and check for the real auxiliary channel to connect.
                 */
                if (from.sin_family == AF_INET && from.sin_port == htons(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;
                from.sin_port = ntohs((u_short)from.sin_port);
                if (from.sin_family != AF_INET ||
                    from.sin_port >= IPPORT_RESERVED ||
                    from.sin_port < 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;
        }
        sigsetmask(oldmask);
        return (s);
bad2:
        if (lport)
                (void)close(*fd2p);
bad:
        (void)close(s);
        sigsetmask(oldmask);
        return (-1);
}
 
int
rresvport(alport)
        int *alport;
{
        struct sockaddr_in sin;
        int s;
 
        bzero(&sin, sizeof sin);
        sin.sin_len = sizeof(struct sockaddr_in);
        sin.sin_family = AF_INET;
        sin.sin_addr.s_addr = INADDR_ANY;
        s = socket(AF_INET, 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
        sin.sin_port = 0;
        if (bindresvport(s, &sin) == -1) {
                (void)close(s);
                return (-1);
        }
        *alport = (int)ntohs(sin.sin_port);
        return (s);
}
 
int     __check_rhosts_file = 1;
char    *__rcmd_errstr;
 
int
ruserok(rhost, superuser, ruser, luser)
        const char *rhost, *ruser, *luser;
        int superuser;
{
        struct hostent *hp;
        u_long addr;
        char **ap;
 
        if ((hp = gethostbyname(rhost)) == NULL)
                return (-1);
        for (ap = hp->h_addr_list; *ap; ++ap) {
                bcopy(*ap, &addr, sizeof(addr));
                if (iruserok(addr, superuser, ruser, luser) == 0)
                        return (0);
        }
        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)
        u_long raddr;
        int superuser;
        const char *ruser, *luser;
{
        register char *cp;
        struct stat sbuf;
        struct passwd *pwd;
        FILE *hostf;
        uid_t uid;
        int first;
        char pbuf[MAXPATHLEN];
 
        first = 1;
        hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
again:
        if (hostf) {
                if (__ivaliduser(hostf, raddr, 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_long raddr;
        const char *luser, *ruser;
{
        register char *user, *p;
        int ch;
        char buf[MAXHOSTNAMELEN + 128];         /* host + login */
        char hname[MAXHOSTNAMELEN];
        struct hostent *hp;
        /* 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 ((hp = gethostbyaddr((char *)&raddr, sizeof(u_long),
                                                        AF_INET)) == NULL)
                return (-1);
        strncpy(hname, hp->h_name, sizeof(hname));
        hname[sizeof(hname) - 1] = '\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(*p) ? tolower(*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 = innetgr((char *)&buf[2],
                                        (char *)&hname, NULL, ypdomain);
                        else            /* match a host by addr */
                                hostok = __icheckhost(raddr,(char *)&buf[1]);
                        break;
                case '-':     /* reject '-' hosts and all their users */
                        if (buf[1] == '@') {
                                if (innetgr((char *)&buf[2],
                                              (char *)&hname, NULL, ypdomain))
                                        return(-1);
                        } else {
                                if (__icheckhost(raddr,(char *)&buf[1]))
                                        return(-1);
                        }
                        break;
                default:  /* if no '+' or '-', do a simple match */
                        hostok = __icheckhost(raddr, 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, lhost)
        u_long raddr;
        register char *lhost;
{
        register struct hostent *hp;
        register u_long laddr;
        register char **pp;
 
        /* Try for raw ip address first. */
        if (isdigit(*lhost) && (long)(laddr = inet_addr(lhost)) != -1)
                return (raddr == laddr);
 
        /* Better be a hostname. */
        if ((hp = gethostbyname(lhost)) == NULL)
                return (0);
 
        /* Spin through ip addresses. */
        for (pp = hp->h_addr_list; *pp; ++pp)
                if (!bcmp(&raddr, *pp, sizeof(u_long)))
                        return (1);
 
        /* No match. */
        return (0);
}

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [rcmd.c] - Blame information for rev 279

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* Copyright (c) 1983, 1993, 1994`
3			`* The Regents of the University of California. All rights reserved.`
4			`*`
5			`* Redistribution and use in source and binary forms, with or without`
6			`* modification, are permitted provided that the following conditions`
7			`* are met:`
8			`* 1. Redistributions of source code must retain the above copyright`
9			`* notice, this list of conditions and the following disclaimer.`
10			`* 2. Redistributions in binary form must reproduce the above copyright`
11			`* notice, this list of conditions and the following disclaimer in the`
12			`* documentation and/or other materials provided with the distribution.`
13			`* 3. All advertising materials mentioning features or use of this software`
14			`* must display the following acknowledgement:`
15			`* This product includes software developed by the University of`
16			`* California, Berkeley and its contributors.`
17			`* 4. Neither the name of the University nor the names of its contributors`
18			`* may be used to endorse or promote products derived from this software`
19			`* without specific prior written permission.`
20			`*`
21			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22			`* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE`
23			`* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE`
24			`* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE`
25			`* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL`
26			`* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS`
27			`* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)`
28			`* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT`
29			`* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY`
30			`* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF`
31			`* SUCH DAMAGE.`
32			`*`
33			`* $Id: rcmd.c,v 1.2 2001-09-27 12:01:53 chris Exp $`
34			`*/`
35
36			`#if defined(LIBC_SCCS) && !defined(lint)`
37			`static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";`
38			`#endif /* LIBC_SCCS and not lint */`
39
40			`#include <sys/param.h>`
41			`#include <sys/socket.h>`
42			`#include <sys/stat.h>`
43
44			`#include <netinet/in.h>`
45			`#include <arpa/inet.h>`
46
47			`#include <signal.h>`
48			`#include <fcntl.h>`
49			`#include <netdb.h>`
50			`#include <unistd.h>`
51			`#include <pwd.h>`
52			`#include <errno.h>`
53			`#include <stdio.h>`
54			`#include <ctype.h>`
55			`#include <string.h>`
56			`#ifdef YP`
57			`#include <rpc/rpc.h>`
58			`#include <rpcsvc/yp_prot.h>`
59			`#include <rpcsvc/ypclnt.h>`
60			`#endif`
61
62			`extern int innetgr __P(( const char , const char , const char , const char ));`
63
64			`#define max(a, b) ((a > b) ? a : b)`
65
66			`int __ivaliduser __P((FILE , u_long, const char , const char *));`
67			`static int __icheckhost __P((u_long, char *));`
68
69			`int`
70			`rcmd(ahost, rport, locuser, remuser, cmd, fd2p)`
71			`char **ahost;`
72			`u_short rport;`
73			`const char locuser, remuser, *cmd;`
74			`int *fd2p;`
75			`{`
76			`struct hostent *hp;`
77			`struct sockaddr_in sin, from;`
78			`fd_set reads;`
79			`long oldmask;`
80			`pid_t pid;`
81			`int s, lport, timo;`
82			`char c;`
83
84			`pid = getpid();`
85			`hp = gethostbyname(*ahost);`
86			`if (hp == NULL) {`
87			`herror(*ahost);`
88			`return (-1);`
89			`}`
90			`*ahost = hp->h_name;`
91			`oldmask = sigblock(sigmask(SIGURG));`
92			`for (timo = 1, lport = IPPORT_RESERVED - 1;;) {`
93			`s = rresvport(&lport);`
94			`if (s < 0) {`
95			`if (errno == EAGAIN)`
96			`(void)fprintf(stderr,`
97			`"rcmd: socket: All ports in use\n");`
98			`else`
99			`(void)fprintf(stderr, "rcmd: socket: %s\n",`
100			`strerror(errno));`
101			`sigsetmask(oldmask);`
102			`return (-1);`
103			`}`
104			`fcntl(s, F_SETOWN, pid);`
105			`bzero(&sin, sizeof sin);`
106			`sin.sin_len = sizeof(struct sockaddr_in);`
107			`sin.sin_family = hp->h_addrtype;`
108			`sin.sin_port = rport;`
109			`bcopy(hp->h_addr_list[0], &sin.sin_addr, MIN(hp->h_length, sizeof sin.sin_addr));`
110			`if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)`
111			`break;`
112			`(void)close(s);`
113			`if (errno == EADDRINUSE) {`
114			`lport--;`
115			`continue;`
116			`}`
117			`if (errno == ECONNREFUSED && timo <= 16) {`
118			`(void)sleep(timo);`
119			`timo *= 2;`
120			`continue;`
121			`}`
122			`if (hp->h_addr_list[1] != NULL) {`
123			`int oerrno = errno;`
124
125			`(void)fprintf(stderr, "connect to address %s: ",`
126			`inet_ntoa(sin.sin_addr));`
127			`errno = oerrno;`
128			`perror(0);`
129			`hp->h_addr_list++;`
130			`bcopy(hp->h_addr_list[0], &sin.sin_addr, MIN(hp->h_length, sizeof sin.sin_addr));`
131			`(void)fprintf(stderr, "Trying %s...\n",`
132			`inet_ntoa(sin.sin_addr));`
133			`continue;`
134			`}`
135			`(void)fprintf(stderr, "%s: %s\n", hp->h_name, strerror(errno));`
136			`sigsetmask(oldmask);`
137			`return (-1);`
138			`}`
139			`lport--;`
140			`if (fd2p == 0) {`
141			`write(s, "", 1);`
142			`lport = 0;`
143			`} else {`
144			`char num[8];`
145			`int s2 = rresvport(&lport), s3;`
146			`int len = sizeof(from);`
147			`int nfds;`
148
149			`if (s2 < 0)`
150			`goto bad;`
151			`listen(s2, 1);`
152			`(void)snprintf(num, sizeof(num), "%d", lport);`
153			`if (write(s, num, strlen(num)+1) != strlen(num)+1) {`
154			`(void)fprintf(stderr,`
155			`"rcmd: write (setting up stderr): %s\n",`
156			`strerror(errno));`
157			`(void)close(s2);`
158			`goto bad;`
159			`}`
160			`nfds = max(s, s2)+1;`
161			`if(nfds > FD_SETSIZE) {`
162			`fprintf(stderr, "rcmd: too many files\n");`
163			`(void)close(s2);`
164			`goto bad;`
165			`}`
166			`again:`
167			`FD_ZERO(&reads);`
168			`FD_SET(s, &reads);`
169			`FD_SET(s2, &reads);`
170			`errno = 0;`
171			`if (select(nfds, &reads, 0, 0, 0) < 1 \|\| !FD_ISSET(s2, &reads)){`
172			`if (errno != 0)`
173			`(void)fprintf(stderr,`
174			`"rcmd: select (setting up stderr): %s\n",`
175			`strerror(errno));`
176			`else`
177			`(void)fprintf(stderr,`
178			`"select: protocol failure in circuit setup\n");`
179			`(void)close(s2);`
180			`goto bad;`
181			`}`
182			`s3 = accept(s2, (struct sockaddr *)&from, &len);`
183			`/*`
184			`* XXX careful for ftp bounce attacks. If discovered, shut them`
185			`* down and check for the real auxiliary channel to connect.`
186			`*/`
187			`if (from.sin_family == AF_INET && from.sin_port == htons(20)) {`
188			`close(s3);`
189			`goto again;`
190			`}`
191			`(void)close(s2);`
192			`if (s3 < 0) {`
193			`(void)fprintf(stderr,`
194			`"rcmd: accept: %s\n", strerror(errno));`
195			`lport = 0;`
196			`goto bad;`
197			`}`
198			`*fd2p = s3;`
199			`from.sin_port = ntohs((u_short)from.sin_port);`
200			`if (from.sin_family != AF_INET \|\|`
201			`from.sin_port >= IPPORT_RESERVED \|\|`
202			`from.sin_port < IPPORT_RESERVED / 2) {`
203			`(void)fprintf(stderr,`
204			`"socket: protocol failure in circuit setup.\n");`
205			`goto bad2;`
206			`}`
207			`}`
208			`(void)write(s, locuser, strlen(locuser)+1);`
209			`(void)write(s, remuser, strlen(remuser)+1);`
210			`(void)write(s, cmd, strlen(cmd)+1);`
211			`if (read(s, &c, 1) != 1) {`
212			`(void)fprintf(stderr,`
213			`"rcmd: %s: %s\n", *ahost, strerror(errno));`
214			`goto bad2;`
215			`}`
216			`if (c != 0) {`
217			`while (read(s, &c, 1) == 1) {`
218			`(void)write(STDERR_FILENO, &c, 1);`
219			`if (c == '\n')`
220			`break;`
221			`}`
222			`goto bad2;`
223			`}`
224			`sigsetmask(oldmask);`
225			`return (s);`
226			`bad2:`
227			`if (lport)`
228			`(void)close(*fd2p);`
229			`bad:`
230			`(void)close(s);`
231			`sigsetmask(oldmask);`
232			`return (-1);`
233			`}`
234
235			`int`
236			`rresvport(alport)`
237			`int *alport;`
238			`{`
239			`struct sockaddr_in sin;`
240			`int s;`
241
242			`bzero(&sin, sizeof sin);`
243			`sin.sin_len = sizeof(struct sockaddr_in);`
244			`sin.sin_family = AF_INET;`
245			`sin.sin_addr.s_addr = INADDR_ANY;`
246			`s = socket(AF_INET, SOCK_STREAM, 0);`
247			`if (s < 0)`
248			`return (-1);`
249			`#if 0 /* compat_exact_traditional_rresvport_semantics */`
250			`sin.sin_port = htons((u_short)*alport);`
251			`if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)`
252			`return (s);`
253			`if (errno != EADDRINUSE) {`
254			`(void)close(s);`
255			`return (-1);`
256			`}`
257			`#endif`
258			`sin.sin_port = 0;`
259			`if (bindresvport(s, &sin) == -1) {`
260			`(void)close(s);`
261			`return (-1);`
262			`}`
263			`*alport = (int)ntohs(sin.sin_port);`
264			`return (s);`
265			`}`
266
267			`int __check_rhosts_file = 1;`
268			`char *__rcmd_errstr;`
269
270			`int`
271			`ruserok(rhost, superuser, ruser, luser)`
272			`const char rhost, ruser, *luser;`
273			`int superuser;`
274			`{`
275			`struct hostent *hp;`
276			`u_long addr;`
277			`char **ap;`
278
279			`if ((hp = gethostbyname(rhost)) == NULL)`
280			`return (-1);`
281			`for (ap = hp->h_addr_list; *ap; ++ap) {`
282			`bcopy(*ap, &addr, sizeof(addr));`
283			`if (iruserok(addr, superuser, ruser, luser) == 0)`
284			`return (0);`
285			`}`
286			`return (-1);`
287			`}`
288
289			`/*`
290			`* New .rhosts strategy: We are passed an ip address. We spin through`
291			`* hosts.equiv and .rhosts looking for a match. When the .rhosts only`
292			`* has ip addresses, we don't have to trust a nameserver. When it`
293			`* contains hostnames, we spin through the list of addresses the nameserver`
294			`* gives us and look for a match.`
295			`*`
296			`* Returns 0 if ok, -1 if not ok.`
297			`*/`
298			`int`
299			`iruserok(raddr, superuser, ruser, luser)`
300			`u_long raddr;`
301			`int superuser;`
302			`const char ruser, luser;`
303			`{`
304			`register char *cp;`
305			`struct stat sbuf;`
306			`struct passwd *pwd;`
307			`FILE *hostf;`
308			`uid_t uid;`
309			`int first;`
310			`char pbuf[MAXPATHLEN];`
311
312			`first = 1;`
313			`hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");`
314			`again:`
315			`if (hostf) {`
316			`if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {`
317			`(void)fclose(hostf);`
318			`return (0);`
319			`}`
320			`(void)fclose(hostf);`
321			`}`
322			`if (first == 1 && (__check_rhosts_file \|\| superuser)) {`
323			`first = 0;`
324			`if ((pwd = getpwnam(luser)) == NULL)`
325			`return (-1);`
326			`(void)strcpy(pbuf, pwd->pw_dir);`
327			`(void)strcat(pbuf, "/.rhosts");`
328
329			`/*`
330			`* Change effective uid while opening .rhosts. If root and`
331			`* reading an NFS mounted file system, can't read files that`
332			`* are protected read/write owner only.`
333			`*/`
334			`uid = geteuid();`
335			`(void)seteuid(pwd->pw_uid);`
336			`hostf = fopen(pbuf, "r");`
337			`(void)seteuid(uid);`
338
339			`if (hostf == NULL)`
340			`return (-1);`
341			`/*`
342			`* If not a regular file, or is owned by someone other than`
343			`* user or root or if writeable by anyone but the owner, quit.`
344			`*/`
345			`cp = NULL;`
346			`if (lstat(pbuf, &sbuf) < 0)`
347			`cp = ".rhosts lstat failed";`
348			`else if (!S_ISREG(sbuf.st_mode))`
349			`cp = ".rhosts not regular file";`
350			`else if (fstat(fileno(hostf), &sbuf) < 0)`
351			`cp = ".rhosts fstat failed";`
352			`else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)`
353			`cp = "bad .rhosts owner";`
354			`else if (sbuf.st_mode & (S_IWGRP\|S_IWOTH))`
355			`cp = ".rhosts writeable by other than owner";`
356			`/* If there were any problems, quit. */`
357			`if (cp) {`
358			`__rcmd_errstr = cp;`
359			`(void)fclose(hostf);`
360			`return (-1);`
361			`}`
362			`goto again;`
363			`}`
364			`return (-1);`
365			`}`
366
367			`/*`
368			`* XXX`
369			`* Don't make static, used by lpd(8).`
370			`*`
371			`* Returns 0 if ok, -1 if not ok.`
372			`*/`
373			`int`
374			`__ivaliduser(hostf, raddr, luser, ruser)`
375			`FILE *hostf;`
376			`u_long raddr;`
377			`const char luser, ruser;`
378			`{`
379			`register char user, p;`
380			`int ch;`
381			`char buf[MAXHOSTNAMELEN + 128]; /* host + login */`
382			`char hname[MAXHOSTNAMELEN];`
383			`struct hostent *hp;`
384			`/* Presumed guilty until proven innocent. */`
385			`int userok = 0, hostok = 0;`
386			`#ifdef YP`
387			`char *ypdomain;`
388
389			`if (yp_get_default_domain(&ypdomain))`
390			`ypdomain = NULL;`
391			`#else`
392			`#define ypdomain NULL`
393			`#endif`
394			`/* We need to get the damn hostname back for netgroup matching. */`
395			`if ((hp = gethostbyaddr((char *)&raddr, sizeof(u_long),`
396			`AF_INET)) == NULL)`
397			`return (-1);`
398			`strncpy(hname, hp->h_name, sizeof(hname));`
399			`hname[sizeof(hname) - 1] = '\0';`
400
401			`while (fgets(buf, sizeof(buf), hostf)) {`
402			`p = buf;`
403			`/* Skip lines that are too long. */`
404			`if (strchr(p, '\n') == NULL) {`
405			`while ((ch = getc(hostf)) != '\n' && ch != EOF);`
406			`continue;`
407			`}`
408			`if (p == '\n' \|\| p == '#') {`
409			`/* comment... */`
410			`continue;`
411			`}`
412			`while (p != '\n' && p != ' ' && p != '\t' && p != '\0') {`
413			`p = isupper(p) ? tolower(p) : p;`
414			`p++;`
415			`}`
416			`if (p == ' ' \|\| p == '\t') {`
417			`*p++ = '\0';`
418			`while (p == ' ' \|\| p == '\t')`
419			`p++;`
420			`user = p;`
421			`while (p != '\n' && p != ' ' &&`
422			`p != '\t' && p != '\0')`
423			`p++;`
424			`} else`
425			`user = p;`
426			`*p = '\0';`
427			`/*`
428			`* Do +/- and +@/-@ checking. This looks really nasty,`
429			`* but it matches SunOS's behavior so far as I can tell.`
430			`*/`
431			`switch(buf[0]) {`
432			`case '+':`
433			`if (!buf[1]) { /* '+' matches all hosts */`
434			`hostok = 1;`
435			`break;`
436			`}`
437			`if (buf[1] == '@') /* match a host by netgroup */`
438			`hostok = innetgr((char *)&buf[2],`
439			`(char *)&hname, NULL, ypdomain);`
440			`else /* match a host by addr */`
441			`hostok = __icheckhost(raddr,(char *)&buf[1]);`
442			`break;`
443			`case '-': /* reject '-' hosts and all their users */`
444			`if (buf[1] == '@') {`
445			`if (innetgr((char *)&buf[2],`
446			`(char *)&hname, NULL, ypdomain))`
447			`return(-1);`
448			`} else {`
449			`if (__icheckhost(raddr,(char *)&buf[1]))`
450			`return(-1);`
451			`}`
452			`break;`
453			`default: /* if no '+' or '-', do a simple match */`
454			`hostok = __icheckhost(raddr, buf);`
455			`break;`
456			`}`
457			`switch(*user) {`
458			`case '+':`
459			`if (!(user+1)) { / '+' matches all users */`
460			`userok = 1;`
461			`break;`
462			`}`
463			`if ((user+1) == '@') / match a user by netgroup */`
464			`userok = innetgr(user+2, NULL, ruser, ypdomain);`
465			`else /* match a user by direct specification */`
466			`userok = !(strcmp(ruser, user+1));`
467			`break;`
468			`case '-': /* if we matched a hostname, */`
469			`if (hostok) { /* check for user field rejections */`
470			`if (!*(user+1))`
471			`return(-1);`
472			`if (*(user+1) == '@') {`
473			`if (innetgr(user+2, NULL,`
474			`ruser, ypdomain))`
475			`return(-1);`
476			`} else {`
477			`if (!strcmp(ruser, user+1))`
478			`return(-1);`
479			`}`
480			`}`
481			`break;`
482			`default: /* no rejections: try to match the user */`
483			`if (hostok)`
484			`userok = !(strcmp(ruser,*user ? user : luser));`
485			`break;`
486			`}`
487			`if (hostok && userok)`
488			`return(0);`
489			`}`
490			`return (-1);`
491			`}`
492
493			`/*`
494			`* Returns "true" if match, 0 if no match.`
495			`*/`
496			`static int`
497			`__icheckhost(raddr, lhost)`
498			`u_long raddr;`
499			`register char *lhost;`
500			`{`
501			`register struct hostent *hp;`
502			`register u_long laddr;`
503			`register char **pp;`
504
505			`/* Try for raw ip address first. */`
506			`if (isdigit(*lhost) && (long)(laddr = inet_addr(lhost)) != -1)`
507			`return (raddr == laddr);`
508
509			`/* Better be a hostname. */`
510			`if ((hp = gethostbyname(lhost)) == NULL)`
511			`return (0);`
512
513			`/* Spin through ip addresses. */`
514			`for (pp = hp->h_addr_list; *pp; ++pp)`
515			`if (!bcmp(&raddr, *pp, sizeof(u_long)))`
516			`return (1);`
517
518			`/* No match. */`
519			`return (0);`
520			`}`