[39e6e65a] | 1 | /*- |
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| 2 | * Copyright (c) 1994, Garrett Wollman |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND |
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| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 23 | * SUCH DAMAGE. |
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| 24 | */ |
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| 25 | |
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[09fdb5e8] | 26 | #if HAVE_CONFIG_H |
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| 27 | #include "config.h" |
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| 28 | #endif |
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[39e6e65a] | 29 | |
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| 30 | #include <sys/param.h> |
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| 31 | #include <sys/socket.h> |
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| 32 | #include <netinet/in.h> |
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| 33 | #include <arpa/inet.h> |
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| 34 | #include <netdb.h> |
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| 35 | #include <stdio.h> |
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| 36 | #include <ctype.h> |
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| 37 | #include <errno.h> |
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| 38 | #include <string.h> |
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[39f13cb] | 39 | #ifdef HAVE_STRINGS_H |
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| 40 | #include <strings.h> |
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| 41 | #endif |
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[39e6e65a] | 42 | #include <arpa/nameser.h> /* XXX hack for _res */ |
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| 43 | #include <resolv.h> /* XXX hack for _res */ |
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| 44 | |
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| 45 | #define _PATH_HOSTCONF "/etc/host.conf" |
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| 46 | |
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| 47 | enum service_type { |
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| 48 | SERVICE_NONE = 0, |
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| 49 | SERVICE_BIND, |
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| 50 | SERVICE_HOSTS, |
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| 51 | SERVICE_NIS }; |
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| 52 | #define SERVICE_MAX SERVICE_NIS |
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| 53 | |
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| 54 | static struct { |
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| 55 | const char *name; |
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| 56 | enum service_type type; |
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| 57 | } service_names[] = { |
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| 58 | { "hosts", SERVICE_HOSTS }, |
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| 59 | { "/etc/hosts", SERVICE_HOSTS }, |
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| 60 | { "hosttable", SERVICE_HOSTS }, |
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| 61 | { "htable", SERVICE_HOSTS }, |
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| 62 | { "bind", SERVICE_BIND }, |
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| 63 | { "dns", SERVICE_BIND }, |
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| 64 | { "domain", SERVICE_BIND }, |
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| 65 | { "yp", SERVICE_NIS }, |
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| 66 | { "yellowpages", SERVICE_NIS }, |
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| 67 | { "nis", SERVICE_NIS }, |
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| 68 | { 0, SERVICE_NONE } |
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| 69 | }; |
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| 70 | |
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| 71 | static enum service_type service_order[SERVICE_MAX + 1]; |
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| 72 | static int service_done = 0; |
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| 73 | |
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| 74 | static enum service_type |
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| 75 | get_service_name(const char *name) { |
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| 76 | int i; |
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| 77 | for(i = 0; service_names[i].type != SERVICE_NONE; i++) { |
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| 78 | if(!strcasecmp(name, service_names[i].name)) { |
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| 79 | return service_names[i].type; |
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| 80 | } |
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| 81 | } |
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| 82 | return SERVICE_NONE; |
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| 83 | } |
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| 84 | |
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| 85 | static void |
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[082d4a2] | 86 | init_services(void) |
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[39e6e65a] | 87 | { |
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| 88 | char *cp, *p, buf[BUFSIZ]; |
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| 89 | register int cc = 0; |
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| 90 | FILE *fd; |
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| 91 | |
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| 92 | if ((fd = (FILE *)fopen(_PATH_HOSTCONF, "r")) == NULL) { |
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| 93 | /* make some assumptions */ |
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| 94 | service_order[0] = SERVICE_BIND; |
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| 95 | service_order[1] = SERVICE_HOSTS; |
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| 96 | service_order[2] = SERVICE_NONE; |
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| 97 | } else { |
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| 98 | while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) { |
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| 99 | if(buf[0] == '#') |
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| 100 | continue; |
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| 101 | |
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| 102 | p = buf; |
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| 103 | while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') |
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| 104 | ; |
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| 105 | if (cp == NULL) |
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| 106 | continue; |
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| 107 | do { |
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[bab5c5fa] | 108 | if (isalpha((unsigned char)cp[0])) { |
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[39e6e65a] | 109 | service_order[cc] = get_service_name(cp); |
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| 110 | if(service_order[cc] != SERVICE_NONE) |
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| 111 | cc++; |
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| 112 | } |
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| 113 | while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') |
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| 114 | ; |
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| 115 | } while(cp != NULL && cc < SERVICE_MAX); |
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| 116 | } |
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| 117 | service_order[cc] = SERVICE_NONE; |
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| 118 | fclose(fd); |
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| 119 | } |
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| 120 | service_done = 1; |
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| 121 | } |
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| 122 | |
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| 123 | struct hostent * |
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| 124 | gethostbyname(const char *name) |
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| 125 | { |
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| 126 | struct hostent *hp; |
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| 127 | |
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| 128 | if (_res.options & RES_USE_INET6) { /* XXX */ |
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| 129 | hp = gethostbyname2(name, AF_INET6); /* XXX */ |
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| 130 | if (hp) /* XXX */ |
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| 131 | return (hp); /* XXX */ |
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| 132 | } /* XXX */ |
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| 133 | return (gethostbyname2(name, AF_INET)); |
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| 134 | } |
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| 135 | |
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| 136 | struct hostent * |
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| 137 | gethostbyname2(const char *name, int type) |
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| 138 | { |
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| 139 | struct hostent *hp = 0; |
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| 140 | int nserv = 0; |
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| 141 | |
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| 142 | if (!service_done) |
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| 143 | init_services(); |
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| 144 | |
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| 145 | while (!hp) { |
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| 146 | switch (service_order[nserv]) { |
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| 147 | case SERVICE_NONE: |
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| 148 | return NULL; |
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| 149 | case SERVICE_HOSTS: |
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| 150 | hp = _gethostbyhtname(name, type); |
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| 151 | break; |
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| 152 | case SERVICE_BIND: |
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| 153 | hp = _gethostbydnsname(name, type); |
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| 154 | break; |
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| 155 | case SERVICE_NIS: |
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| 156 | hp = _gethostbynisname(name, type); |
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| 157 | break; |
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| 158 | } |
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| 159 | nserv++; |
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| 160 | } |
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| 161 | return hp; |
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| 162 | } |
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| 163 | |
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[1fbd0baf] | 164 | int gethostbyaddr_r(const void *addr, socklen_t len, int type, |
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| 165 | struct hostent *ret, char *buf, size_t buflen, |
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| 166 | struct hostent **result, int *h_errnop) |
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| 167 | { |
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| 168 | #warning "implement a proper gethostbyaddr_r" |
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| 169 | |
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| 170 | *result = gethostbyaddr( addr, len, type ); |
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| 171 | if ( *result ) |
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| 172 | return 0; |
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| 173 | return -1; |
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| 174 | } |
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| 175 | |
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[39e6e65a] | 176 | struct hostent * |
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[807337d2] | 177 | gethostbyaddr(const void *addr, socklen_t len, int type) |
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[39e6e65a] | 178 | { |
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| 179 | struct hostent *hp = 0; |
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| 180 | int nserv = 0; |
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| 181 | |
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| 182 | if (!service_done) |
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| 183 | init_services(); |
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| 184 | |
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| 185 | while (!hp) { |
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| 186 | switch (service_order[nserv]) { |
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| 187 | case SERVICE_NONE: |
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| 188 | return 0; |
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| 189 | case SERVICE_HOSTS: |
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| 190 | hp = _gethostbyhtaddr(addr, len, type); |
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| 191 | break; |
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| 192 | case SERVICE_BIND: |
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| 193 | hp = _gethostbydnsaddr(addr, len, type); |
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| 194 | break; |
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| 195 | case SERVICE_NIS: |
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| 196 | hp = _gethostbynisaddr(addr, len, type); |
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| 197 | break; |
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| 198 | } |
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| 199 | nserv++; |
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| 200 | } |
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| 201 | return hp; |
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| 202 | } |
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| 203 | |
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| 204 | void |
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[029c374c] | 205 | sethostent(int stayopen) |
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[39e6e65a] | 206 | { |
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| 207 | _sethosthtent(stayopen); |
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| 208 | _sethostdnsent(stayopen); |
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| 209 | } |
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| 210 | |
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| 211 | void |
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[029c374c] | 212 | endhostent(void) |
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[39e6e65a] | 213 | { |
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| 214 | _endhosthtent(); |
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| 215 | _endhostdnsent(); |
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| 216 | } |
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[068c3ee1] | 217 | |
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| 218 | #ifdef _THREAD_SAFE |
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| 219 | |
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| 220 | /* return length of decoded data or -1 */ |
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| 221 | static int __dns_decodename(unsigned char *packet,unsigned int offset,unsigned char *dest, |
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| 222 | unsigned int maxlen,unsigned char* behindpacket) { |
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| 223 | unsigned char *tmp; |
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| 224 | unsigned char *max=dest+maxlen; |
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| 225 | unsigned char *after=packet+offset; |
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| 226 | int ok=0; |
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| 227 | for (tmp=after; maxlen>0&&*tmp; ) { |
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| 228 | if (tmp>=behindpacket) return -1; |
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| 229 | if ((*tmp>>6)==3) { /* goofy DNS decompression */ |
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| 230 | unsigned int ofs=((unsigned int)(*tmp&0x3f)<<8)|*(tmp+1); |
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| 231 | if (ofs>=(unsigned int)offset) return -1; /* RFC1035: "pointer to a _prior_ occurrance" */ |
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| 232 | if (after<tmp+2) after=tmp+2; |
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| 233 | tmp=packet+ofs; |
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| 234 | ok=0; |
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| 235 | } else { |
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| 236 | unsigned int duh; |
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| 237 | if (dest+*tmp+1>max) return -1; |
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| 238 | if (tmp+*tmp+1>=behindpacket) return -1; |
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| 239 | for (duh=*tmp; duh>0; --duh) |
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| 240 | *dest++=*++tmp; |
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| 241 | *dest++='.'; ok=1; |
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| 242 | ++tmp; |
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| 243 | if (tmp>after) { after=tmp; if (!*tmp) ++after; } |
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| 244 | } |
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| 245 | } |
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| 246 | if (ok) --dest; |
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| 247 | *dest=0; |
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| 248 | return after-packet; |
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| 249 | } |
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| 250 | |
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[082d4a2] | 251 | static int __dns_gethostbyx_r( |
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| 252 | const char* name, |
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| 253 | struct hostent* result, |
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| 254 | char *buf, size_t buflen, |
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| 255 | struct hostent **RESULT, |
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| 256 | int *h_errnop, |
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| 257 | int lookfor) |
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| 258 | { |
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[068c3ee1] | 259 | |
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| 260 | int names,ips; |
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| 261 | unsigned char *cur; |
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| 262 | unsigned char *max; |
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| 263 | unsigned char inpkg[1500]; |
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| 264 | char* tmp; |
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| 265 | int size; |
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| 266 | |
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| 267 | if (lookfor==1) { |
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| 268 | result->h_addrtype=AF_INET; |
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| 269 | result->h_length=4; |
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| 270 | } else { |
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| 271 | result->h_addrtype=AF_INET6; |
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| 272 | result->h_length=16; |
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| 273 | } |
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| 274 | result->h_aliases=(char**)(buf+8*sizeof(char*)); |
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| 275 | result->h_addr_list=(char**)buf; |
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| 276 | result->h_aliases[0]=0; |
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| 277 | |
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[199ccde] | 278 | cur=(unsigned char*)buf+16*sizeof(char*); |
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| 279 | max=(unsigned char*)buf+buflen; |
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[068c3ee1] | 280 | names=ips=0; |
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| 281 | |
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| 282 | if ((size=res_query(name,C_IN,lookfor,inpkg,512))<0) { |
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| 283 | invalidpacket: |
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| 284 | *h_errnop=HOST_NOT_FOUND; |
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| 285 | return -1; |
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| 286 | } |
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| 287 | { |
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[199ccde] | 288 | tmp=(char*)inpkg+12; |
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[068c3ee1] | 289 | { |
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| 290 | char Name[257]; |
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| 291 | unsigned short q=((unsigned short)inpkg[4]<<8)+inpkg[5]; |
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| 292 | while (q>0) { |
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| 293 | if (tmp>(char*)inpkg+size) goto invalidpacket; |
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| 294 | while (*tmp) { tmp+=*tmp+1; if (tmp>(char*)inpkg+size) goto invalidpacket; } |
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| 295 | tmp+=5; |
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| 296 | --q; |
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| 297 | } |
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| 298 | if (tmp>(char*)inpkg+size) goto invalidpacket; |
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| 299 | q=((unsigned short)inpkg[6]<<8)+inpkg[7]; |
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| 300 | if (q<1) goto nodata; |
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| 301 | while (q>0) { |
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[199ccde] | 302 | int decofs=__dns_decodename(inpkg,(size_t)(tmp-(char*)inpkg),(unsigned char*)Name,256,inpkg+size); |
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[068c3ee1] | 303 | if (decofs<0) break; |
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[199ccde] | 304 | tmp=(char*)inpkg+decofs; |
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[068c3ee1] | 305 | --q; |
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| 306 | if (tmp[0]!=0 || tmp[1]!=lookfor || /* TYPE != A */ |
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| 307 | tmp[2]!=0 || tmp[3]!=1) { /* CLASS != IN */ |
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| 308 | if (tmp[1]==5) { /* CNAME */ |
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| 309 | tmp+=10; |
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[199ccde] | 310 | decofs=__dns_decodename(inpkg,(size_t)(tmp-(char*)inpkg),(unsigned char*)Name,256,inpkg+size); |
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[068c3ee1] | 311 | if (decofs<0) break; |
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[199ccde] | 312 | tmp=(char*)inpkg+decofs; |
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[068c3ee1] | 313 | } else |
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| 314 | break; |
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| 315 | continue; |
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| 316 | } |
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| 317 | tmp+=10; /* skip type, class, TTL and length */ |
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| 318 | { |
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| 319 | int slen; |
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| 320 | if (lookfor==1 || lookfor==28) /* A or AAAA*/ { |
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| 321 | slen=strlen(Name); |
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| 322 | if (cur+slen+8+(lookfor==28?12:0)>=max) { *h_errnop=NO_RECOVERY; return -1; } |
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| 323 | } else if (lookfor==12) /* PTR */ { |
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[199ccde] | 324 | decofs=__dns_decodename(inpkg,(size_t)(tmp-(char*)inpkg),(unsigned char*)Name,256,inpkg+size); |
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[068c3ee1] | 325 | if (decofs<0) break; |
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[199ccde] | 326 | tmp=(char*)inpkg+decofs; |
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[068c3ee1] | 327 | slen=strlen(Name); |
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| 328 | } else |
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| 329 | slen=strlen(Name); |
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[199ccde] | 330 | strcpy((char*)cur,Name); |
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[068c3ee1] | 331 | if (names==0) |
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[199ccde] | 332 | result->h_name=(char*)cur; |
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[068c3ee1] | 333 | else |
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[199ccde] | 334 | result->h_aliases[names-1]=(char*)cur; |
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[068c3ee1] | 335 | result->h_aliases[names]=0; |
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| 336 | if (names<8) ++names; |
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| 337 | /* cur+=slen+1; */ |
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| 338 | cur+=(slen|3)+1; |
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[199ccde] | 339 | result->h_addr_list[ips++] = (char*)cur; |
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[068c3ee1] | 340 | if (lookfor==1) /* A */ { |
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| 341 | *(int*)cur=*(int*)tmp; |
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| 342 | cur+=4; |
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| 343 | result->h_addr_list[ips]=0; |
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| 344 | } else if (lookfor==28) /* AAAA */ { |
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| 345 | { |
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| 346 | int k; |
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| 347 | for (k=0; k<16; ++k) cur[k]=tmp[k]; |
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| 348 | } |
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| 349 | cur+=16; |
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| 350 | result->h_addr_list[ips]=0; |
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| 351 | } |
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| 352 | } |
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| 353 | /* puts(Name); */ |
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| 354 | } |
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| 355 | } |
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| 356 | } |
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| 357 | if (!names) { |
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| 358 | nodata: |
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| 359 | *h_errnop=NO_DATA; |
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| 360 | return -1; |
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| 361 | } |
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| 362 | *h_errnop=0; |
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| 363 | *RESULT=result; |
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| 364 | return 0; |
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| 365 | } |
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| 366 | |
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| 367 | |
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| 368 | |
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| 369 | |
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| 370 | int gethostbyname_r(const char* name, |
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| 371 | struct hostent* result, |
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| 372 | char *buf, |
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| 373 | int buflen, |
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| 374 | struct hostent **RESULT, |
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| 375 | int *h_errnop) |
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| 376 | { |
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[8c85ca3] | 377 | uintptr_t current = (uintptr_t) buf; |
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| 378 | uintptr_t end = current + buflen; |
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[068c3ee1] | 379 | size_t L=strlen(name); |
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| 380 | |
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[8c85ca3] | 381 | *RESULT = NULL; |
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| 382 | *h_errnop = 0; |
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| 383 | |
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| 384 | result->h_name = (char *) current; |
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| 385 | current += L + 1; |
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| 386 | if (current > end) { *h_errnop = ERANGE; return 1; } |
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| 387 | strcpy(result->h_name, name); |
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| 388 | |
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| 389 | current += sizeof(char **); |
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| 390 | current -= current & (sizeof(char **) - 1); |
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| 391 | result->h_addr_list = (char **) current; |
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| 392 | current += 2 * sizeof(char **); |
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| 393 | result->h_aliases = (char **) current; |
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| 394 | current += sizeof(char **); |
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| 395 | if (current > end) { *h_errnop = ERANGE; return 1; } |
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| 396 | result->h_addr_list [0]= (char *) current; |
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| 397 | current += 16; |
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| 398 | result->h_addr_list [1] = NULL; |
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| 399 | result->h_aliases [0] = NULL; |
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| 400 | if (current > end) { *h_errnop = ERANGE; return 1; } |
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[068c3ee1] | 401 | if (inet_pton(AF_INET,name,result->h_addr_list[0])) { |
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| 402 | result->h_addrtype=AF_INET; |
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| 403 | result->h_length=4; |
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| 404 | *RESULT=result; |
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| 405 | return 0; |
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| 406 | } else if (inet_pton(AF_INET6,name,result->h_addr_list[0])) { |
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| 407 | result->h_addrtype=AF_INET6; |
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| 408 | result->h_length=16; |
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[8c85ca3] | 409 | *RESULT=result; |
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| 410 | return 0; |
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[068c3ee1] | 411 | } |
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| 412 | |
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| 413 | |
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| 414 | { |
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| 415 | struct hostent* r; |
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| 416 | sethostent(0); |
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| 417 | while ((r=gethostent_r(buf,buflen))) { |
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| 418 | int i; |
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| 419 | if (r->h_addrtype==AF_INET && !strcasecmp(r->h_name,name)) { /* found it! */ |
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| 420 | found: |
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| 421 | memmove(result,r,sizeof(struct hostent)); |
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| 422 | *RESULT=result; |
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| 423 | endhostent(); |
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| 424 | return 0; |
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| 425 | } |
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| 426 | for (i=0; i<16; ++i) { |
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| 427 | if (r->h_aliases[i]) { |
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| 428 | if (!strcasecmp(r->h_aliases[i],name)) goto found; |
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| 429 | } else break; |
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| 430 | } |
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| 431 | } |
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| 432 | endhostent(); |
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| 433 | } |
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| 434 | |
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| 435 | return __dns_gethostbyx_r(name,result,buf+L,buflen-L,RESULT,h_errnop,1); |
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| 436 | } |
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| 437 | |
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| 438 | #endif |
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| 439 | |
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