| 1 | /* |
| 2 | * Routines for testing only. Not really industrial strength. |
| 3 | * |
| 4 | * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. |
| 5 | * |
| 6 | * $FreeBSD: src/contrib/tcp_wrappers/scaffold.c,v 1.2.2.1 2000/07/18 08:34:55 ume Exp $ |
| 7 | */ |
| 8 | |
| 9 | /* System libraries. */ |
| 10 | |
| 11 | #include <sys/types.h> |
| 12 | #include <sys/stat.h> |
| 13 | #include <sys/socket.h> |
| 14 | #include <netinet/in.h> |
| 15 | #include <arpa/inet.h> |
| 16 | #include <netdb.h> |
| 17 | #include <stdio.h> |
| 18 | #include <syslog.h> |
| 19 | #include <setjmp.h> |
| 20 | #include <string.h> |
| 21 | #include <stdlib.h> |
| 22 | |
| 23 | #ifndef INADDR_NONE |
| 24 | #define INADDR_NONE (-1) /* XXX should be 0xffffffff */ |
| 25 | #endif |
| 26 | |
| 27 | #ifndef INET6 |
| 28 | #include <stdlib.h> |
| 29 | #endif |
| 30 | |
| 31 | /* Application-specific. */ |
| 32 | |
| 33 | #include "tcpd.h" |
| 34 | #include "scaffold.h" |
| 35 | |
| 36 | /* |
| 37 | * These are referenced by the options module and by rfc931.c. |
| 38 | */ |
| 39 | int allow_severity = SEVERITY; |
| 40 | int deny_severity = LOG_WARNING; |
| 41 | int rfc931_timeout = RFC931_TIMEOUT; |
| 42 | |
| 43 | #ifndef INET6 |
| 44 | /* dup_hostent - create hostent in one memory block */ |
| 45 | |
| 46 | static struct hostent *dup_hostent(hp) |
| 47 | struct hostent *hp; |
| 48 | { |
| 49 | struct hostent_block { |
| 50 | struct hostent host; |
| 51 | char *addr_list[1]; |
| 52 | }; |
| 53 | struct hostent_block *hb; |
| 54 | int count; |
| 55 | char *data; |
| 56 | char *addr; |
| 57 | |
| 58 | for (count = 0; hp->h_addr_list[count] != 0; count++) |
| 59 | /* void */ ; |
| 60 | |
| 61 | if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block) |
| 62 | + (hp->h_length + sizeof(char *)) * count)) == 0) { |
| 63 | fprintf(stderr, "Sorry, out of memory\n"); |
| 64 | exit(1); |
| 65 | } |
| 66 | memset((char *) &hb->host, 0, sizeof(hb->host)); |
| 67 | hb->host.h_length = hp->h_length; |
| 68 | hb->host.h_addr_list = hb->addr_list; |
| 69 | hb->host.h_addr_list[count] = 0; |
| 70 | data = (char *) (hb->host.h_addr_list + count + 1); |
| 71 | |
| 72 | for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) { |
| 73 | hb->host.h_addr_list[count] = data + hp->h_length * count; |
| 74 | memcpy(hb->host.h_addr_list[count], addr, hp->h_length); |
| 75 | } |
| 76 | return (&hb->host); |
| 77 | } |
| 78 | #endif |
| 79 | |
| 80 | /* find_inet_addr - find all addresses for this host, result to free() */ |
| 81 | |
| 82 | #ifdef INET6 |
| 83 | struct addrinfo *find_inet_addr(host) |
| 84 | char *host; |
| 85 | { |
| 86 | struct addrinfo hints, *res; |
| 87 | |
| 88 | memset(&hints, 0, sizeof(hints)); |
| 89 | hints.ai_family = PF_UNSPEC; |
| 90 | hints.ai_socktype = SOCK_STREAM; |
| 91 | hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; |
| 92 | if (getaddrinfo(host, NULL, &hints, &res) == 0) |
| 93 | return (res); |
| 94 | |
| 95 | memset(&hints, 0, sizeof(hints)); |
| 96 | hints.ai_family = PF_UNSPEC; |
| 97 | hints.ai_socktype = SOCK_STREAM; |
| 98 | hints.ai_flags = AI_PASSIVE | AI_CANONNAME; |
| 99 | if (getaddrinfo(host, NULL, &hints, &res) != 0) { |
| 100 | tcpd_warn("%s: host not found", host); |
| 101 | return (0); |
| 102 | } |
| 103 | if (res->ai_family != AF_INET6 && res->ai_family != AF_INET) { |
| 104 | tcpd_warn("%d: not an internet host", res->ai_family); |
| 105 | freeaddrinfo(res); |
| 106 | return (0); |
| 107 | } |
| 108 | if (!res->ai_canonname) { |
| 109 | tcpd_warn("%s: hostname alias", host); |
| 110 | tcpd_warn("(cannot obtain official name)"); |
| 111 | } else if (STR_NE(host, res->ai_canonname)) { |
| 112 | tcpd_warn("%s: hostname alias", host); |
| 113 | tcpd_warn("(official name: %.*s)", STRING_LENGTH, res->ai_canonname); |
| 114 | } |
| 115 | return (res); |
| 116 | } |
| 117 | #else |
| 118 | struct hostent *find_inet_addr(host) |
| 119 | char *host; |
| 120 | { |
| 121 | struct in_addr addr; |
| 122 | struct hostent *hp; |
| 123 | static struct hostent h; |
| 124 | static char *addr_list[2]; |
| 125 | |
| 126 | /* |
| 127 | * Host address: translate it to internal form. |
| 128 | */ |
| 129 | if ((addr.s_addr = dot_quad_addr(host)) != INADDR_NONE) { |
| 130 | h.h_addr_list = addr_list; |
| 131 | h.h_addr_list[0] = (char *) &addr; |
| 132 | h.h_length = sizeof(addr); |
| 133 | return (dup_hostent(&h)); |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Map host name to a series of addresses. Watch out for non-internet |
| 138 | * forms or aliases. The NOT_INADDR() is here in case gethostbyname() has |
| 139 | * been "enhanced" to accept numeric addresses. Make a copy of the |
| 140 | * address list so that later gethostbyXXX() calls will not clobber it. |
| 141 | */ |
| 142 | if (NOT_INADDR(host) == 0) { |
| 143 | tcpd_warn("%s: not an internet address", host); |
| 144 | return (0); |
| 145 | } |
| 146 | if ((hp = gethostbyname(host)) == 0) { |
| 147 | tcpd_warn("%s: host not found", host); |
| 148 | return (0); |
| 149 | } |
| 150 | if (hp->h_addrtype != AF_INET) { |
| 151 | tcpd_warn("%d: not an internet host", hp->h_addrtype); |
| 152 | return (0); |
| 153 | } |
| 154 | if (STR_NE(host, hp->h_name)) { |
| 155 | tcpd_warn("%s: hostname alias", host); |
| 156 | tcpd_warn("(official name: %.*s)", STRING_LENGTH, hp->h_name); |
| 157 | } |
| 158 | return (dup_hostent(hp)); |
| 159 | } |
| 160 | #endif |
| 161 | |
| 162 | /* check_dns - give each address thorough workout, return address count */ |
| 163 | |
| 164 | int check_dns(host) |
| 165 | char *host; |
| 166 | { |
| 167 | struct request_info request; |
| 168 | #ifdef INET6 |
| 169 | struct sockaddr_storage sin; |
| 170 | struct addrinfo *hp, *res; |
| 171 | #else |
| 172 | struct sockaddr_in sin; |
| 173 | struct hostent *hp; |
| 174 | char *addr; |
| 175 | #endif |
| 176 | int count; |
| 177 | |
| 178 | if ((hp = find_inet_addr(host)) == 0) |
| 179 | return (0); |
| 180 | request_init(&request, RQ_CLIENT_SIN, &sin, 0); |
| 181 | sock_methods(&request); |
| 182 | #ifndef INET6 |
| 183 | memset((char *) &sin, 0, sizeof(sin)); |
| 184 | sin.sin_family = AF_INET; |
| 185 | #endif |
| 186 | |
| 187 | #ifdef INET6 |
| 188 | for (res = hp, count = 0; res; res = res->ai_next, count++) { |
| 189 | memcpy(&sin, res->ai_addr, res->ai_addrlen); |
| 190 | #else |
| 191 | for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) { |
| 192 | memcpy((char *) &sin.sin_addr, addr, sizeof(sin.sin_addr)); |
| 193 | #endif |
| 194 | |
| 195 | /* |
| 196 | * Force host name and address conversions. Use the request structure |
| 197 | * as a cache. Detect hostname lookup problems. Any name/name or |
| 198 | * name/address conflicts will be reported while eval_hostname() does |
| 199 | * its job. |
| 200 | */ |
| 201 | request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0); |
| 202 | if (STR_EQ(eval_hostname(request.client), unknown)) |
| 203 | tcpd_warn("host address %s->name lookup failed", |
| 204 | eval_hostaddr(request.client)); |
| 205 | } |
| 206 | #ifdef INET6 |
| 207 | freeaddrinfo(hp); |
| 208 | #else |
| 209 | free((char *) hp); |
| 210 | #endif |
| 211 | return (count); |
| 212 | } |
| 213 | |
| 214 | /* dummy function to intercept the real shell_cmd() */ |
| 215 | |
| 216 | /* ARGSUSED */ |
| 217 | |
| 218 | void shell_cmd(command) |
| 219 | char *command; |
| 220 | { |
| 221 | if (hosts_access_verbose) |
| 222 | printf("command: %s", command); |
| 223 | } |
| 224 | |
| 225 | /* dummy function to intercept the real clean_exit() */ |
| 226 | |
| 227 | /* ARGSUSED */ |
| 228 | |
| 229 | void clean_exit(request) |
| 230 | struct request_info *request; |
| 231 | { |
| 232 | exit(0); |
| 233 | } |
| 234 | |
| 235 | /* check_path - examine accessibility */ |
| 236 | |
| 237 | int check_path(path, st) |
| 238 | char *path; |
| 239 | struct stat *st; |
| 240 | { |
| 241 | struct stat stbuf; |
| 242 | char buf[BUFSIZ]; |
| 243 | |
| 244 | if (stat(path, st) < 0) |
| 245 | return (-1); |
| 246 | #ifdef notdef |
| 247 | if (st->st_uid != 0) |
| 248 | tcpd_warn("%s: not owned by root", path); |
| 249 | if (st->st_mode & 020) |
| 250 | tcpd_warn("%s: group writable", path); |
| 251 | #endif |
| 252 | if (st->st_mode & 002) |
| 253 | tcpd_warn("%s: world writable", path); |
| 254 | if (path[0] == '/' && path[1] != 0) { |
| 255 | strrchr(strcpy(buf, path), '/')[0] = 0; |
| 256 | (void) check_path(buf[0] ? buf : "/", &stbuf); |
| 257 | } |
| 258 | return (0); |
| 259 | } |