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1.1 ! root 1: /* ! 2: * Copyright (c) 1983 Regents of the University of California. ! 3: * All rights reserved. ! 4: * ! 5: * Redistribution and use in source and binary forms are permitted ! 6: * provided that the above copyright notice and this paragraph are ! 7: * duplicated in all such forms and that any documentation, ! 8: * advertising materials, and other materials related to such ! 9: * distribution and use acknowledge that the software was developed ! 10: * by the University of California, Berkeley. The name of the ! 11: * University may not be used to endorse or promote products derived ! 12: * from this software without specific prior written permission. ! 13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR ! 14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED ! 15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. ! 16: */ ! 17: ! 18: #if defined(LIBC_SCCS) && !defined(lint) ! 19: static char sccsid[] = "@(#)rcmd.c 5.17 (Berkeley) 6/27/88"; ! 20: #endif /* LIBC_SCCS and not lint */ ! 21: ! 22: #include <stdio.h> ! 23: #include <ctype.h> ! 24: #include <pwd.h> ! 25: #include <sys/param.h> ! 26: #include <sys/file.h> ! 27: #include <sys/signal.h> ! 28: #include <sys/socket.h> ! 29: #include <sys/stat.h> ! 30: ! 31: #include <netinet/in.h> ! 32: ! 33: #include <netdb.h> ! 34: #include <errno.h> ! 35: ! 36: extern errno; ! 37: char *index(); ! 38: ! 39: rcmd(ahost, rport, locuser, remuser, cmd, fd2p) ! 40: char **ahost; ! 41: u_short rport; ! 42: char *locuser, *remuser, *cmd; ! 43: int *fd2p; ! 44: { ! 45: int s, timo = 1, pid; ! 46: long oldmask; ! 47: struct sockaddr_in sin, sin2, from; ! 48: char c; ! 49: int lport = IPPORT_RESERVED - 1; ! 50: struct hostent *hp; ! 51: ! 52: pid = getpid(); ! 53: hp = gethostbyname(*ahost); ! 54: if (hp == 0) { ! 55: fprintf(stderr, "%s: unknown host\n", *ahost); ! 56: return (-1); ! 57: } ! 58: *ahost = hp->h_name; ! 59: oldmask = sigblock(sigmask(SIGURG)); ! 60: for (;;) { ! 61: s = rresvport(&lport); ! 62: if (s < 0) { ! 63: if (errno == EAGAIN) ! 64: fprintf(stderr, "socket: All ports in use\n"); ! 65: else ! 66: perror("rcmd: socket"); ! 67: sigsetmask(oldmask); ! 68: return (-1); ! 69: } ! 70: fcntl(s, F_SETOWN, pid); ! 71: sin.sin_family = hp->h_addrtype; ! 72: bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length); ! 73: sin.sin_port = rport; ! 74: if (connect(s, (caddr_t)&sin, sizeof (sin), 0) >= 0) ! 75: break; ! 76: (void) close(s); ! 77: if (errno == EADDRINUSE) { ! 78: lport--; ! 79: continue; ! 80: } ! 81: if (errno == ECONNREFUSED && timo <= 16) { ! 82: sleep(timo); ! 83: timo *= 2; ! 84: continue; ! 85: } ! 86: if (hp->h_addr_list[1] != NULL) { ! 87: int oerrno = errno; ! 88: ! 89: fprintf(stderr, ! 90: "connect to address %s: ", inet_ntoa(sin.sin_addr)); ! 91: errno = oerrno; ! 92: perror(0); ! 93: hp->h_addr_list++; ! 94: bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, ! 95: hp->h_length); ! 96: fprintf(stderr, "Trying %s...\n", ! 97: inet_ntoa(sin.sin_addr)); ! 98: continue; ! 99: } ! 100: perror(hp->h_name); ! 101: sigsetmask(oldmask); ! 102: return (-1); ! 103: } ! 104: lport--; ! 105: if (fd2p == 0) { ! 106: write(s, "", 1); ! 107: lport = 0; ! 108: } else { ! 109: char num[8]; ! 110: int s2 = rresvport(&lport), s3; ! 111: int len = sizeof (from); ! 112: ! 113: if (s2 < 0) ! 114: goto bad; ! 115: listen(s2, 1); ! 116: (void) sprintf(num, "%d", lport); ! 117: if (write(s, num, strlen(num)+1) != strlen(num)+1) { ! 118: perror("write: setting up stderr"); ! 119: (void) close(s2); ! 120: goto bad; ! 121: } ! 122: s3 = accept(s2, &from, &len, 0); ! 123: (void) close(s2); ! 124: if (s3 < 0) { ! 125: perror("accept"); ! 126: lport = 0; ! 127: goto bad; ! 128: } ! 129: *fd2p = s3; ! 130: from.sin_port = ntohs((u_short)from.sin_port); ! 131: if (from.sin_family != AF_INET || ! 132: from.sin_port >= IPPORT_RESERVED) { ! 133: fprintf(stderr, ! 134: "socket: protocol failure in circuit setup.\n"); ! 135: goto bad2; ! 136: } ! 137: } ! 138: (void) write(s, locuser, strlen(locuser)+1); ! 139: (void) write(s, remuser, strlen(remuser)+1); ! 140: (void) write(s, cmd, strlen(cmd)+1); ! 141: if (read(s, &c, 1) != 1) { ! 142: perror(*ahost); ! 143: goto bad2; ! 144: } ! 145: if (c != 0) { ! 146: while (read(s, &c, 1) == 1) { ! 147: (void) write(2, &c, 1); ! 148: if (c == '\n') ! 149: break; ! 150: } ! 151: goto bad2; ! 152: } ! 153: sigsetmask(oldmask); ! 154: return (s); ! 155: bad2: ! 156: if (lport) ! 157: (void) close(*fd2p); ! 158: bad: ! 159: (void) close(s); ! 160: sigsetmask(oldmask); ! 161: return (-1); ! 162: } ! 163: ! 164: rresvport(alport) ! 165: int *alport; ! 166: { ! 167: struct sockaddr_in sin; ! 168: int s; ! 169: ! 170: sin.sin_family = AF_INET; ! 171: sin.sin_addr.s_addr = INADDR_ANY; ! 172: s = socket(AF_INET, SOCK_STREAM, 0); ! 173: if (s < 0) ! 174: return (-1); ! 175: for (;;) { ! 176: sin.sin_port = htons((u_short)*alport); ! 177: if (bind(s, (caddr_t)&sin, sizeof (sin)) >= 0) ! 178: return (s); ! 179: if (errno != EADDRINUSE) { ! 180: (void) close(s); ! 181: return (-1); ! 182: } ! 183: (*alport)--; ! 184: if (*alport == IPPORT_RESERVED/2) { ! 185: (void) close(s); ! 186: errno = EAGAIN; /* close */ ! 187: return (-1); ! 188: } ! 189: } ! 190: } ! 191: ! 192: ruserok(rhost, superuser, ruser, luser) ! 193: char *rhost; ! 194: int superuser; ! 195: char *ruser, *luser; ! 196: { ! 197: FILE *hostf; ! 198: char fhost[MAXHOSTNAMELEN]; ! 199: int first = 1; ! 200: register char *sp, *p; ! 201: int baselen = -1; ! 202: ! 203: sp = rhost; ! 204: p = fhost; ! 205: while (*sp) { ! 206: if (*sp == '.') { ! 207: if (baselen == -1) ! 208: baselen = sp - rhost; ! 209: *p++ = *sp++; ! 210: } else { ! 211: *p++ = isupper(*sp) ? tolower(*sp++) : *sp++; ! 212: } ! 213: } ! 214: *p = '\0'; ! 215: hostf = superuser ? (FILE *)0 : fopen("/etc/hosts.equiv", "r"); ! 216: again: ! 217: if (hostf) { ! 218: if (!_validuser(hostf, fhost, luser, ruser, baselen)) { ! 219: (void) fclose(hostf); ! 220: return(0); ! 221: } ! 222: (void) fclose(hostf); ! 223: } ! 224: if (first == 1) { ! 225: struct stat sbuf; ! 226: struct passwd *pwd; ! 227: char pbuf[MAXPATHLEN]; ! 228: ! 229: first = 0; ! 230: if ((pwd = getpwnam(luser)) == NULL) ! 231: return(-1); ! 232: (void)strcpy(pbuf, pwd->pw_dir); ! 233: (void)strcat(pbuf, "/.rhosts"); ! 234: if ((hostf = fopen(pbuf, "r")) == NULL) ! 235: return(-1); ! 236: (void)fstat(fileno(hostf), &sbuf); ! 237: if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) { ! 238: fclose(hostf); ! 239: return(-1); ! 240: } ! 241: goto again; ! 242: } ! 243: return (-1); ! 244: } ! 245: ! 246: _validuser(hostf, rhost, luser, ruser, baselen) ! 247: char *rhost, *luser, *ruser; ! 248: FILE *hostf; ! 249: int baselen; ! 250: { ! 251: char *user; ! 252: char ahost[MAXHOSTNAMELEN]; ! 253: register char *p; ! 254: ! 255: while (fgets(ahost, sizeof (ahost), hostf)) { ! 256: p = ahost; ! 257: while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { ! 258: *p = isupper(*p) ? tolower(*p) : *p; ! 259: p++; ! 260: } ! 261: if (*p == ' ' || *p == '\t') { ! 262: *p++ = '\0'; ! 263: while (*p == ' ' || *p == '\t') ! 264: p++; ! 265: user = p; ! 266: while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') ! 267: p++; ! 268: } else ! 269: user = p; ! 270: *p = '\0'; ! 271: if (_checkhost(rhost, ahost, baselen) && ! 272: !strcmp(ruser, *user ? user : luser)) { ! 273: return (0); ! 274: } ! 275: } ! 276: return (-1); ! 277: } ! 278: ! 279: _checkhost(rhost, lhost, len) ! 280: char *rhost, *lhost; ! 281: int len; ! 282: { ! 283: static char ldomain[MAXHOSTNAMELEN + 1]; ! 284: static char *domainp = NULL; ! 285: static int nodomain = 0; ! 286: register char *cp; ! 287: ! 288: if (len == -1) ! 289: return(!strcmp(rhost, lhost)); ! 290: if (strncmp(rhost, lhost, len)) ! 291: return(0); ! 292: if (!strcmp(rhost, lhost)) ! 293: return(1); ! 294: if (*(lhost + len) != '\0') ! 295: return(0); ! 296: if (nodomain) ! 297: return(0); ! 298: if (!domainp) { ! 299: if (gethostname(ldomain, sizeof(ldomain)) == -1) { ! 300: nodomain = 1; ! 301: return(0); ! 302: } ! 303: ldomain[MAXHOSTNAMELEN] = NULL; ! 304: if ((domainp = index(ldomain, '.')) == (char *)NULL) { ! 305: nodomain = 1; ! 306: return(0); ! 307: } ! 308: for (cp = ++domainp; *cp; ++cp) ! 309: if (isupper(*cp)) ! 310: *cp = tolower(*cp); ! 311: } ! 312: return(!strcmp(domainp, rhost + len +1)); ! 313: }
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