text: /*
   * Copyright (c) 1980, 1993
   *	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.
   *
   * $FreeBSD: src/lib/libcompat/4.3/rexec.c,v 1.6 2000/08/04 11:15:48 kris Exp $
   */
  
  #if defined(LIBC_SCCS) && !defined(lint)
  static char sccsid[] = "@(#)rexec.c	8.1 (Berkeley) 6/4/93";
  #endif /* LIBC_SCCS and not lint */
  
  #include <sys/types.h>
  #include <sys/uio.h>
  #include <sys/socket.h>
  #include <sys/param.h>
  #include <sys/stat.h>
  
  #include <netinet/in.h>
  
  #include <stdio.h>
  #include <unistd.h>
  #include <string.h>
  #include <netdb.h>
  #include <errno.h>
  #include <ctype.h>
  #include <err.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  int	rexecoptions;
  char	*getpass(), *getlogin();
  
  /*
   * Options and other state info.
   */
  struct macel {
  	char mac_name[9];	/* macro name */
  	char *mac_start;	/* start of macro in macbuf */
  	char *mac_end;		/* end of macro in macbuf */
  };
  
  int macnum;			/* number of defined macros */
  struct macel macros[16];
  char macbuf[4096];
  
  static	FILE *cfile;
  
  #define	DEFAULT	1
  #define	LOGIN	2
  #define	PASSWD	3
  #define	ACCOUNT 4
  #define MACDEF  5
  #define	ID	10
  #define	MACH	11
  
  static char tokval[100];
  
  static struct toktab {
  	char *tokstr;
  	int tval;
  } toktab[]= {
  	{ "default",	DEFAULT },
  	{ "login",	LOGIN },
  	{ "password",	PASSWD },
  	{ "passwd",	PASSWD },
  	{ "account",	ACCOUNT },
  	{ "machine",	MACH },
  	{ "macdef",	MACDEF },
  	{ NULL,		0 }
  };
  
  static int
  token()
  {
  	char *cp;
  	int c;
  	struct toktab *t;
  
  	if (feof(cfile) || ferror(cfile))
  		return (0);
  	while ((c = getc(cfile)) != EOF &&
  	    (c == '\n' || c == '\t' || c == ' ' || c == ','))
  		continue;
  	if (c == EOF)
  		return (0);
  	cp = tokval;
  	if (c == '"') {
  		while ((c = getc(cfile)) != EOF && c != '"') {
  			if (c == '\\')
  				c = getc(cfile);
  			*cp++ = c;
  		}
  	} else {
  		*cp++ = c;
  		while ((c = getc(cfile)) != EOF
  		    && c != '\n' && c != '\t' && c != ' ' && c != ',') {
  			if (c == '\\')
  				c = getc(cfile);
  			*cp++ = c;
  		}
  	}
  	*cp = 0;
  	if (tokval[0] == 0)
  		return (0);
  	for (t = toktab; t->tokstr; t++)
  		if (!strcmp(t->tokstr, tokval))
  			return (t->tval);
  	return (ID);
  }
  
  static int
  ruserpass(host, aname, apass, aacct)
  	char *host, **aname, **apass, **aacct;
  {
  	char *hdir, buf[BUFSIZ], *tmp;
  	char myname[MAXHOSTNAMELEN], *mydomain;
  	int t, i, c, usedefault = 0;
  	struct stat stb;
  
  	hdir = getenv("HOME");
  	if (hdir == NULL)
  		hdir = ".";
  	if (strlen(hdir) + 8 > sizeof(buf))
  		return (0);
  	(void) sprintf(buf, "%s/.netrc", hdir);
  	cfile = fopen(buf, "r");
  	if (cfile == NULL) {
  		if (errno != ENOENT)
  			warn("%s", buf);
  		return (0);
  	}
  	if (gethostname(myname, sizeof(myname)) < 0)
  		myname[0] = '\0';
  	if ((mydomain = strchr(myname, '.')) == NULL)
  		mydomain = "";
  next:
  	while ((t = token())) switch(t) {
  
  	case DEFAULT:
  		usedefault = 1;
  		/* FALL THROUGH */
  
  	case MACH:
  		if (!usedefault) {
  			if (token() != ID)
  				continue;
  			/*
  			 * Allow match either for user's input host name
  			 * or official hostname.  Also allow match of
  			 * incompletely-specified host in local domain.
  			 */
  			if (strcasecmp(host, tokval) == 0)
  				goto match;
  			if ((tmp = strchr(host, '.')) != NULL &&
  			    strcasecmp(tmp, mydomain) == 0 &&
  			    strncasecmp(host, tokval, tmp - host) == 0 &&
  			    tokval[tmp - host] == '\0')
  				goto match;
  			continue;
  		}
  	match:
  		while ((t = token()) && t != MACH && t != DEFAULT) switch(t) {
  
  		case LOGIN:
  			if (token())
  				if (*aname == 0) {
  					*aname = malloc((unsigned) strlen(tokval) + 1);
  					(void) strcpy(*aname, tokval);
  				} else {
  					if (strcmp(*aname, tokval))
  						goto next;
  				}
  			break;
  		case PASSWD:
  			if ((*aname == 0 || strcmp(*aname, "anonymous")) &&
  			    fstat(fileno(cfile), &stb) >= 0 &&
  			    (stb.st_mode & 077) != 0) {
  	warnx("Error: .netrc file is readable by others.");
  	warnx("Remove password or make file unreadable by others.");
  				goto bad;
  			}
  			if (token() && *apass == 0) {
  				*apass = malloc((unsigned) strlen(tokval) + 1);
  				(void) strcpy(*apass, tokval);
  			}
  			break;
  		case ACCOUNT:
  			if (fstat(fileno(cfile), &stb) >= 0
  			    && (stb.st_mode & 077) != 0) {
  	warnx("Error: .netrc file is readable by others.");
  	warnx("Remove account or make file unreadable by others.");
  				goto bad;
  			}
  			if (token() && *aacct == 0) {
  				*aacct = malloc((unsigned) strlen(tokval) + 1);
  				(void) strcpy(*aacct, tokval);
  			}
  			break;
  		case MACDEF:
  			while ((c=getc(cfile)) != EOF &&
  						(c == ' ' || c == '\t'))
  				;
  			if (c == EOF || c == '\n') {
  				printf("Missing macdef name argument.\n");
  				goto bad;
  			}
  			if (macnum == 16) {
  				printf("Limit of 16 macros have already been defined\n");
  				goto bad;
  			}
  			tmp = macros[macnum].mac_name;
  			*tmp++ = c;
  			for (i=0; i < 8 && (c=getc(cfile)) != EOF &&
  			    !isspace(c); ++i) {
  				*tmp++ = c;
  			}
  			if (c == EOF) {
  				printf("Macro definition missing null line terminator.\n");
  				goto bad;
  			}
  			*tmp = '\0';
  			if (c != '\n') {
  				while ((c=getc(cfile)) != EOF && c != '\n');
  			}
  			if (c == EOF) {
  				printf("Macro definition missing null line terminator.\n");
  				goto bad;
  			}
  			if (macnum == 0) {
  				macros[macnum].mac_start = macbuf;
  			}
  			else {
  				macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
  			}
  			tmp = macros[macnum].mac_start;
  			while (tmp != macbuf + 4096) {
  				if ((c=getc(cfile)) == EOF) {
  				printf("Macro definition missing null line terminator.\n");
  					goto bad;
  				}
  				*tmp = c;
  				if (*tmp == '\n') {
  					if (*(tmp-1) == '\0') {
  					   macros[macnum++].mac_end = tmp - 1;
  					   break;
  					}
  					*tmp = '\0';
  				}
  				tmp++;
  			}
  			if (tmp == macbuf + 4096) {
  				printf("4K macro buffer exceeded\n");
  				goto bad;
  			}
  			break;
  		default:
  			warnx("Unknown .netrc keyword %s", tokval);
  			break;
  		}
  		goto done;
  	}
  done:
  	(void) fclose(cfile);
  	return (0);
  bad:
  	(void) fclose(cfile);
  	return (-1);
  }
  
  int
  rexec(ahost, rport, name, pass, cmd, fd2p)
  	char **ahost;
  	int rport;
  	char *name, *pass, *cmd;
  	int *fd2p;
  {
  	struct sockaddr_in sin, sin2, from;
  	struct hostent *hp;
  	u_short port;
  	int s, timo = 1, s3;
  	char c;
  
  	hp = gethostbyname(*ahost);
  	if (hp == 0) {
  		herror(*ahost);
  		return (-1);
  	}
  	*ahost = hp->h_name;
  	ruserpass(hp->h_name, &name, &pass);
  retry:
  	s = socket(AF_INET, SOCK_STREAM, 0);
  	if (s < 0) {
  		perror("rexec: socket");
  		return (-1);
  	}
  	sin.sin_family = hp->h_addrtype;
  	sin.sin_port = rport;
  	bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
  	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
  		if (errno == ECONNREFUSED && timo <= 16) {
  			(void) close(s);
  			sleep(timo);
  			timo *= 2;
  			goto retry;
  		}
  		perror(hp->h_name);
  		return (-1);
  	}
  	if (fd2p == 0) {
  		(void) write(s, "", 1);
  		port = 0;
  	} else {
  		char num[8];
  		int s2, sin2len;
  
  		s2 = socket(AF_INET, SOCK_STREAM, 0);
  		if (s2 < 0) {
  			(void) close(s);
  			return (-1);
  		}
  		listen(s2, 1);
  		sin2len = sizeof (sin2);
  		if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
  		  sin2len != sizeof (sin2)) {
  			perror("getsockname");
  			(void) close(s2);
  			goto bad;
  		}
  		port = ntohs((u_short)sin2.sin_port);
  		(void) sprintf(num, "%u", port);
  		(void) write(s, num, strlen(num)+1);
  		{ int len = sizeof (from);
  		  s3 = accept(s2, (struct sockaddr *)&from, &len);
  		  close(s2);
  		  if (s3 < 0) {
  			perror("accept");
  			port = 0;
  			goto bad;
  		  }
  		}
  		*fd2p = s3;
  	}
  	(void) write(s, name, strlen(name) + 1);
  	/* should public key encypt the password here */
  	(void) write(s, pass, strlen(pass) + 1);
  	(void) write(s, cmd, strlen(cmd) + 1);
  	if (read(s, &c, 1) != 1) {
  		perror(*ahost);
  		goto bad;
  	}
  	if (c != 0) {
  		while (read(s, &c, 1) == 1) {
  			(void) write(2, &c, 1);
  			if (c == '\n')
  				break;
  		}
  		goto bad;
  	}
  	return (s);
  bad:
  	if (port)
  		(void) close(*fd2p);
  	(void) close(s);
  	return (-1);
  }
  