1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
|
/*
* Routines for testing only. Not really industrial strength.
*
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
*/
#ifndef lint
static char sccs_id[] = "@(#) scaffold.c 1.6 97/03/21 19:27:24";
#endif
/* System libraries. */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <setjmp.h>
#include <string.h>
#ifndef INADDR_NONE
#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
#endif
#ifndef INET6
extern char *malloc();
#endif
/* Application-specific. */
#include "tcpd.h"
#include "scaffold.h"
/*
* These are referenced by the options module and by rfc931.c.
*/
int allow_severity = SEVERITY;
int deny_severity = LOG_WARNING;
int rfc931_timeout = RFC931_TIMEOUT;
#ifndef INET6
/* dup_hostent - create hostent in one memory block */
static struct hostent *dup_hostent(hp)
struct hostent *hp;
{
struct hostent_block {
struct hostent host;
char *addr_list[1];
};
struct hostent_block *hb;
int count;
char *data;
char *addr;
for (count = 0; hp->h_addr_list[count] != 0; count++)
/* void */ ;
if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block)
+ (hp->h_length + sizeof(char *)) * count)) == 0) {
fprintf(stderr, "Sorry, out of memory\n");
exit(1);
}
memset((char *) &hb->host, 0, sizeof(hb->host));
hb->host.h_length = hp->h_length;
hb->host.h_addr_list = hb->addr_list;
hb->host.h_addr_list[count] = 0;
data = (char *) (hb->host.h_addr_list + count + 1);
for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
hb->host.h_addr_list[count] = data + hp->h_length * count;
memcpy(hb->host.h_addr_list[count], addr, hp->h_length);
}
return (&hb->host);
}
#endif
/* find_inet_addr - find all addresses for this host, result to free() */
#ifdef INET6
struct addrinfo *find_inet_addr(host)
char *host;
{
struct addrinfo hints, *res;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
if (getaddrinfo(host, NULL, &hints, &res) == 0)
return (res);
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_CANONNAME;
if (getaddrinfo(host, NULL, &hints, &res) != 0) {
tcpd_warn("%s: host not found", host);
return (0);
}
if (res->ai_family != AF_INET6 && res->ai_family != AF_INET) {
tcpd_warn("%d: not an internet host", res->ai_family);
freeaddrinfo(res);
return (0);
}
if (!res->ai_canonname) {
tcpd_warn("%s: hostname alias", host);
tcpd_warn("(cannot obtain official name)", res->ai_canonname);
} else if (STR_NE(host, res->ai_canonname)) {
tcpd_warn("%s: hostname alias", host);
tcpd_warn("(official name: %.*s)", STRING_LENGTH, res->ai_canonname);
}
return (res);
}
#else
struct hostent *find_inet_addr(host)
char *host;
{
struct in_addr addr;
struct hostent *hp;
static struct hostent h;
static char *addr_list[2];
/*
* Host address: translate it to internal form.
*/
if ((addr.s_addr = dot_quad_addr(host)) != INADDR_NONE) {
h.h_addr_list = addr_list;
h.h_addr_list[0] = (char *) &addr;
h.h_length = sizeof(addr);
return (dup_hostent(&h));
}
/*
* Map host name to a series of addresses. Watch out for non-internet
* forms or aliases. The NOT_INADDR() is here in case gethostbyname() has
* been "enhanced" to accept numeric addresses. Make a copy of the
* address list so that later gethostbyXXX() calls will not clobber it.
*/
if (NOT_INADDR(host) == 0) {
tcpd_warn("%s: not an internet address", host);
return (0);
}
if ((hp = gethostbyname(host)) == 0) {
tcpd_warn("%s: host not found", host);
return (0);
}
if (hp->h_addrtype != AF_INET) {
tcpd_warn("%d: not an internet host", hp->h_addrtype);
return (0);
}
if (STR_NE(host, hp->h_name)) {
tcpd_warn("%s: hostname alias", host);
tcpd_warn("(official name: %.*s)", STRING_LENGTH, hp->h_name);
}
return (dup_hostent(hp));
}
#endif
/* check_dns - give each address thorough workout, return address count */
int check_dns(host)
char *host;
{
struct request_info request;
#ifdef INET6
struct sockaddr_storage sin;
struct addrinfo *hp, *res;
#else
struct sockaddr_in sin;
struct hostent *hp;
#endif
int count;
char *addr;
if ((hp = find_inet_addr(host)) == 0)
return (0);
request_init(&request, RQ_CLIENT_SIN, &sin, 0);
sock_methods(&request);
#ifndef INET6
memset((char *) &sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
#endif
#ifdef INET6
for (res = hp, count = 0; res; res = res->ai_next, count++) {
memcpy(&sin, res->ai_addr, res->ai_addrlen);
#else
for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
memcpy((char *) &sin.sin_addr, addr, sizeof(sin.sin_addr));
#endif
/*
* Force host name and address conversions. Use the request structure
* as a cache. Detect hostname lookup problems. Any name/name or
* name/address conflicts will be reported while eval_hostname() does
* its job.
*/
request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0);
if (STR_EQ(eval_hostname(request.client), unknown))
tcpd_warn("host address %s->name lookup failed",
eval_hostaddr(request.client));
}
#ifdef INET6
freeaddrinfo(hp);
#else
free((char *) hp);
#endif
return (count);
}
/* dummy function to intercept the real shell_cmd() */
/* ARGSUSED */
void shell_cmd(command)
char *command;
{
if (hosts_access_verbose)
printf("command: %s", command);
}
/* dummy function to intercept the real clean_exit() */
/* ARGSUSED */
void clean_exit(request)
struct request_info *request;
{
exit(0);
}
/* dummy function to intercept the real rfc931() */
/* ARGSUSED */
void rfc931(rmt_sin, our_sin, dest)
#ifdef INET6
struct sockaddr *rmt_sin;
struct sockaddr *our_sin;
#else
struct sockaddr_in *rmt_sin;
struct sockaddr_in *our_sin;
#endif
char *dest;
{
strcpy(dest, unknown);
}
/* check_path - examine accessibility */
int check_path(path, st)
char *path;
struct stat *st;
{
struct stat stbuf;
char buf[BUFSIZ];
if (stat(path, st) < 0)
return (-1);
#ifdef notdef
if (st->st_uid != 0)
tcpd_warn("%s: not owned by root", path);
if (st->st_mode & 020)
tcpd_warn("%s: group writable", path);
#endif
if (st->st_mode & 002)
tcpd_warn("%s: world writable", path);
if (path[0] == '/' && path[1] != 0) {
strrchr(strcpy(buf, path), '/')[0] = 0;
(void) check_path(buf[0] ? buf : "/", &stbuf);
}
return (0);
}
|