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/*
* Copyright (C) 1990-2008 by CERN/IT/PDP/DM
* All rights reserved
*/
#ifndef lint
static char cvsId[] = "@(#)$RCSfile: remote.c,v $ $Revision: 1.8 $ $Date: 2008/10/29 10:08:53 $ CERN/IT/PDP/DM Olof Barring";
#endif /* not lint */
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#if defined(_WIN32)
#include <winsock2.h>
#include <ws2tcpip.h>
#include <ws_errmsg.h>
#else
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/param.h>
#endif /* WIN32 */
#include <ctype.h>
#include <string.h>
#if defined(SOLARIS)
#include <sys/sockio.h>
#endif
#if defined(_AIX)
#include <sys/time.h> /* needed for if.h */
#endif /* AIX */
#if !defined(_WIN32)
#include <net/if.h> /* Network interfaces */
#include <sys/ioctl.h> /* ioctl() definitions */
#endif
#include <Castor_limits.h>
#include <log.h>
#include <net.h>
#include <serrno.h>
#include <Cnetdb.h>
#if defined(linux) || defined (__APPLE__)
#include <ifaddrs.h>
#endif
#ifndef _WIN32
#if defined(_REENTRANT) || defined(_THREAD_SAFE)
#define strtok(X,Y) strtok_r(X,Y,&last)
#endif /* _REENTRANT || _THREAD_SAFE */
#endif /* _WIN32 */
#ifndef LOCALHOSTSFILE
#if defined(_WIN32)
#define LOCALHOSTSFILE "%SystemRoot%\\system32\\drivers\\etc\\shift.localhosts"
#else
#define LOCALHOSTSFILE "/etc/shift.localhosts"
#endif /* WIN32 */
#endif
#ifndef RTHOSTSFILE
#if defined(_WIN32)
#define RTHOSTSFILE "%SystemRoot%\\system32\\drivers\\etc\\shift.rthosts"
#else
#define RTHOSTSFILE "/etc/shift.rthosts"
#endif /* WIN32 */
#endif
#define IN6_FILTER(x) (IN6_IS_ADDR_LOOPBACK(x) || \
IN6_IS_ADDR_LINKLOCAL(x) || \
IN6_IS_ADDR_SITELOCAL(x) || \
IN6_IS_ADDR_MULTICAST(x))
enum scan_sources {
SOURCE_GETIFADDRS,
SOURCE_SIOCGLIFCONF,
SOURCE_SIOCGIFCONF
};
typedef struct if_scan_result_s {
struct sockaddr *sa;
int ipv6_prefixlen;
enum scan_sources scan_source;
const char *if_name;
} if_scan_result_t;
struct isremote_cb_data {
int number_of_ipv6_compared;
int isremote;
int ipv4_avail;
struct in_addr from_host;
struct in6_addr from6_host;
};
struct getifnam_cb_data {
int is_ipv4;
struct in_addr from_host;
struct in6_addr from6_host;
char *if_name;
size_t if_namelen;
};
typedef int(*scan_callback_t)(void*, if_scan_result_t*);
extern char *getconfent();
static int DLL_DECL match_ipv6_string _PROTO((const struct in6_addr *, const char *));
static int DLL_DECL match_ipv6 _PROTO((const struct in6_addr *, const struct in6_addr *, int));
static int DLL_DECL netmask_to_prefixlen _PROTO((const struct in6_addr *));
static void *next_xifr _PROTO((void *, const struct sockaddr *, size_t));
static int DLL_DECL scan_interfaces _PROTO((void *, scan_callback_t));
static int DLL_DECL isremote_scan_cb _PROTO((void *, if_scan_result_t *));
static int DLL_DECL getifnam_scan_cb _PROTO((void *, if_scan_result_t *));
static int scan_interfaces(void *user_cbdata, scan_callback_t callback) {
if_scan_result_t result;
int cb_ret;
/* if getifaddrs is available try scanning with that
* (usually both AF_INET and AF_INET6)
*/
#if defined(linux) || defined(__APPLE__)
{
struct ifaddrs *ifatop, *ifa;
int plen;
log(LOG_DEBUG , "scan_interfaces(): Using getifaddrs()\n");
result.scan_source = SOURCE_GETIFADDRS;
if (getifaddrs(&ifatop)<0) {
log(LOG_DEBUG , "scan_interfaces(): getifaddrs() return error %s\n", strerror(errno));
ifatop = NULL;
}
for(ifa = ifatop; ifa != NULL; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL)
continue;
result.sa = (struct sockaddr*)ifa->ifa_addr;
result.if_name = ifa->ifa_name;
if (result.sa->sa_family == AF_INET6) {
plen = 64;
if (ifa->ifa_netmask != NULL && ((struct sockaddr*)ifa->ifa_netmask)->sa_family == AF_INET6) {
struct in6_addr *test6_netmask = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
plen = netmask_to_prefixlen(test6_netmask);
}
result.ipv6_prefixlen = plen;
}
cb_ret = (*callback)(user_cbdata, &result);
if (cb_ret) {
freeifaddrs(ifatop);
return (cb_ret);
}
}
if (ifatop != NULL)
freeifaddrs(ifatop);
}
#endif
/* if available look for AF_INET6 interface details with SIOCGLIFCONF and SIOCGLIFADDR
*/
#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR)
{
struct lifconf lifc;
struct lifreq *lifr, lifr2;
int plen,s_s;
char *endp;
char buf[BUFSIZ]; /* A buffer */
memset(&lifc, '\0', sizeof(lifc));
lifc.lifc_len = sizeof(buf);
lifc.lifc_buf = buf;
lifr = lifc.lifc_req;
lifc.lifc_family = AF_INET6;
log(LOG_DEBUG , "scan_interfaces(): Using ioctl SIOCGLIFCONF\n");
result.scan_source = SOURCE_SIOCGLIFCONF;
s_s = socket(AF_INET6, SOCK_DGRAM, 0);
if (s_s<0 || ioctl(s_s, SIOCGLIFCONF, (char *)&lifc)<0) {
log(LOG_DEBUG , "scan_interfaces(): error creating socket or making SIOCGLIFCONF ioctl call: %s", strerror(errno));
lifr = NULL;
}
endp = (char *) lifr + lifc.lifc_len;
for( ; lifr && (((char *) &lifr->lifr_addr) < endp) ;
lifr = (struct lifreq *)next_xifr(lifr, (struct sockaddr *)&lifr->lifr_addr, sizeof(struct lifreq)) ) {
result.sa = (struct sockaddr *)&lifr->lifr_addr;
result.if_name = lifr->lifr_name;
if (result.sa->sa_family == AF_INET6) {
memset(&lifr2, '\0', sizeof(struct lifreq));
memcpy(lifr2.lifr_name, lifr->lifr_name, sizeof(lifr2.lifr_name));
memcpy(&lifr2.lifr_addr, &lifr->lifr_addr, sizeof(lifr2.lifr_addr));
plen = 64;
if (ioctl(s_s, SIOCGLIFADDR, &lifr2)>=0) {
if (((struct sockaddr *)&lifr2.lifr_addr)->sa_family == AF_INET6 && lifr2.lifr_addrlen>0) {
plen = lifr2.lifr_addrlen;
}
}
result.ipv6_prefixlen = plen;
}
cb_ret = (*callback)(user_cbdata, &result);
if (cb_ret) {
close(s_s);
return (cb_ret);
}
}
if (s_s>=0)
close(s_s);
}
#endif
/* scanning with SIO_GET_INTERFACE_LIST (windows) or SIOCGIFCONF (other)
* (usually only AF_INET)
*/
{
int s_s;
char buf[BUFSIZ]; /* A buffer */
#if defined(_WIN32)
struct sockaddr_in addr;
INTERFACE_INFO *iinfo;
char ibuf[BUFSIZ];
int buflen;
int rcode;
#else
struct ifconf ifc; /* ifconf structure */
struct ifreq *ifr; /* Pointer on ifreq structure */
struct ifreq ifr2;
char *endp;
#endif
log(LOG_DEBUG , "scan_interfaces(): Using ioctl SIOCGIFCONF\n");
result.scan_source = SOURCE_SIOCGIFCONF;
if( (s_s = socket(AF_INET, SOCK_DGRAM, 0)) != SOCKET_ERROR ) {
#if defined(_WIN32)
rcode = WSAIoctl(s_s, SIO_GET_INTERFACE_LIST, ibuf, BUFSIZ, buf, BUFSIZ, &buflen, NULL, NULL);
if( rcode == SOCKET_ERROR ) {
log(LOG_ERR, "scan_interfaces(): WSAIoctl(SIO_GET_INTERFACE_LIST): %s\n", geterr());
} else {
for( iinfo = (INTERFACE_INFO*)buf; iinfo < (INTERFACE_INFO*)(buf + buflen); iinfo++ ) {
result.sa = (struct sockaddr *)&iinfo->iiAddress;
result.if_name = (char *)NULL;
if (result.sa->sa_family == AF_INET6) {
struct in6_addr *test6_netmask = &((struct sockaddr_in6 *)&iinfo->iiNetmask)->sin6_addr;
result.ipv6_prefixlen = netmask_to_prefixlen(test6_netmask);
}
cb_ret = (*callback)(user_cbdata, &result);
if (cb_ret) {
closesock(s_s);
return (cb_ret);
}
}
}
closesock(s_s);
#else
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
ifr = ifc.ifc_req;
if (ioctl(s_s, SIOCGIFCONF, (char *)&ifc) < 0) {
log(LOG_ERR, "scan_interfaces(): ioctl(SIOCGIFCONF): %s\n",strerror(errno));
} else {
endp = (char *) ifr + ifc.ifc_len;
while (((char *) &ifr->ifr_addr) < endp) {
result.sa = (struct sockaddr *)&ifr->ifr_addr;
result.if_name = ifr->ifr_name;
if (result.sa->sa_family == AF_INET6) {
int plen = 64;
#if defined(SIOCGIFNETMASK)
memset(&ifr2, '\0', sizeof(struct ifreq));
memcpy(ifr2.ifr_name, ifr->ifr_name, sizeof(ifr2.ifr_name));
memcpy(&ifr2.ifr_addr, &ifr->ifr_addr, sizeof(ifr2.ifr_addr));
if (ioctl(s_s, SIOCGIFNETMASK, (char *)&ifr2) >= 0) {
if (((struct sockaddr *)&ifr2.ifr_addr)->sa_family == AF_INET6) {
struct in6_addr *nm = &((struct sockaddr_in6 *)&ifr2.ifr_addr)->sin6_addr;
plen = netmask_to_prefixlen(nm);
}
}
#endif
result.ipv6_prefixlen = plen;
}
cb_ret = (*callback)(user_cbdata, &result);
if (cb_ret) {
close(s_s);
return (cb_ret);
}
ifr = (struct ifreq *)next_xifr(ifr, (struct sockaddr *)&ifr->ifr_addr, sizeof(struct ifreq));
}
}
close(s_s);
#endif /* _WIN32 */
}
}
return(0);
}
static int isremote_scan_cb(void *vp, if_scan_result_t *result) {
struct isremote_cb_data *data = vp;
struct in6_addr *test6_addr;
switch(result->scan_source) {
case SOURCE_GETIFADDRS:
case SOURCE_SIOCGLIFCONF:
if (data->ipv4_avail || result->sa->sa_family != AF_INET6) return(0);
test6_addr = &((struct sockaddr_in6 *)result->sa)->sin6_addr;
if (IN6_FILTER(test6_addr)) return(0);
data->number_of_ipv6_compared++;
if (match_ipv6(test6_addr,&data->from6_host,result->ipv6_prefixlen)) {
log(LOG_DEBUG,"isremote_scan_cb(): IPv6 peer is at our site, according to interface list\n");
data->isremote = 0;
return(1);
}
return(0);
break;
case SOURCE_SIOCGIFCONF:
if (data->ipv4_avail && result->sa->sa_family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in *)result->sa;
log(LOG_DEBUG , "isremote_scan_cb: Comparing %d and %d \n",inet_netof(sin->sin_addr),inet_netof(data->from_host));
if ( inet_netof(sin->sin_addr) == inet_netof(data->from_host) ) {
data->isremote = 0;
return(1);
}
} else if (result->sa->sa_family == AF_INET6) {
test6_addr = &((struct sockaddr_in6 *)result->sa)->sin6_addr;
if (IN6_FILTER(test6_addr)) return(0);
data->number_of_ipv6_compared++;
if (match_ipv6(test6_addr,&data->from6_host,result->ipv6_prefixlen)) {
log(LOG_DEBUG,"isremote_scan_cb(): IPv6 peer is at our site, according to interface list\n");
data->isremote = 0;
return(1);
}
}
return(0);
break;
}
return(1);
}
static int getifnam_scan_cb(void *vp, if_scan_result_t *result) {
struct getifnam_cb_data *data = vp;
if (result->if_name == NULL)
return(0);
if (data->is_ipv4 && result->sa->sa_family == AF_INET) {
if (!memcmp(&data->from_host, &((struct sockaddr_in *)result->sa)->sin_addr, sizeof(struct in_addr))) {
strncpy(data->if_name, result->if_name, data->if_namelen);
data->if_name[data->if_namelen-1] = '\0';
return(1);
}
} else if (!data->is_ipv4 && result->sa->sa_family == AF_INET6) {
if (IN6_ARE_ADDR_EQUAL(&data->from6_host,&((struct sockaddr_in6 *)result->sa)->sin6_addr)) {
strncpy(data->if_name, result->if_name, data->if_namelen);
data->if_name[data->if_namelen-1] = '\0';
return(1);
}
}
return(0);
}
/* currently used in getifnam.c - not prototyped in any header files */
char *getifnam_sa(const struct sockaddr *sa, char *ifname, size_t ifnamelen) {
int scan_ret;
struct getifnam_cb_data data;
int is_ipv4 = 0;
struct in_addr from_host;
struct in6_addr from6_host;
if (ifname == NULL || ifnamelen<=0)
return(NULL);
memset(&data, '\0', sizeof(data));
memset(&from_host, '\0', sizeof(from_host));
memset(&from6_host, '\0', sizeof(from6_host));
if (sa->sa_family == AF_INET) {
is_ipv4 = 1;
memcpy(&from_host, &((struct sockaddr_in *)sa)->sin_addr, sizeof(from_host));
} else if (sa->sa_family == AF_INET6) {
memcpy(&from6_host, &((struct sockaddr_in6 *)sa)->sin6_addr, sizeof(from6_host));
if (IN6_IS_ADDR_V4MAPPED(&from6_host) || IN6_IS_ADDR_V4COMPAT(&from6_host)) {
memcpy(&from_host,&from6_host.s6_addr[12],sizeof(from_host));
is_ipv4 = 1;
}
} else {
return(NULL);
}
data.is_ipv4 = is_ipv4;
data.if_name = ifname;
data.if_namelen = ifnamelen;
memcpy(&data.from_host, &from_host, sizeof(data.from_host));
memcpy(&data.from6_host, &from6_host, sizeof(data.from6_host));
scan_ret = scan_interfaces(&data, &getifnam_scan_cb);
if (scan_ret) {
return(ifname);
}
return(NULL);
}
/*
* isremote_sa(): returns 0 if requestor is in site
* 1 if requestor is out of site
* -1 in case of an error
*/
/* currently used in various places - not prototyped in any header files */
int DLL_DECL isremote_sa(from_saddr, host_name)
struct sockaddr *from_saddr;
char *host_name ;
{
char *p ;
char local[CA_MAXHOSTNAMELEN+1];
char ent[25] ;
#if defined(_REENTRANT) || defined(_THREAD_SAFE)
char *last = NULL;
#endif /* _REENTRANT || _THREAD_SAFE */
#if defined(_WIN32) || defined(__STDC__)
char lhfile[CA_MAXPATHLEN+1] = LOCALHOSTSFILE;
char rthfile[CA_MAXPATHLEN+1] = RTHOSTSFILE;
#else
char *lhfile = LOCALHOSTSFILE;
char *rthfile = RTHOSTSFILE;
#endif
struct in6_addr from6_host;
struct in_addr from_host;
int save_serrno, ipv4_avail;
struct isremote_cb_data data;
save_serrno = serrno;
if ( (p=getconfent("SIMULATION","REMOTE",1))!=NULL &&
(p=(char *)strtok(p," \t"))!=NULL && !strcmp(p,"YES")) {
log(LOG_DEBUG,"isremote(): Client simulates remote behaviour\n");
return 1 ;
}
if ( (p=getconfent("ISREMOTE","CALLS",1))!=NULL &&
(p=(char *)strtok(p," \t") )!=NULL && !strcmp(p,"NO") ) {
log(LOG_DEBUG,"isremote(): Any connection assumed from local site\n");
return 0 ;
}
serrno = save_serrno;
ipv4_avail = 0;
gethostname(local, CA_MAXHOSTNAMELEN+1);
if (from_saddr->sa_family == AF_INET) {
memcpy(&from_host,&((struct sockaddr_in *)from_saddr)->sin_addr,sizeof(from_host));
memset(&from6_host, '\0', sizeof(from6_host));
memcpy(&from6_host.s6_addr[12], &from_host, 4);
from6_host.s6_addr[10] = 0xff;
from6_host.s6_addr[11] = 0xff;
ipv4_avail = 1;
} else if (from_saddr->sa_family == AF_INET6) {
memcpy(&from6_host,&((struct sockaddr_in6 *)from_saddr)->sin6_addr,sizeof(from6_host));
if (IN6_IS_ADDR_V4MAPPED(&from6_host) || IN6_IS_ADDR_V4COMPAT(&from6_host)) {
memcpy(&from_host,&from6_host.s6_addr[12],sizeof(from_host));
ipv4_avail = 1;
}
} else {
log(LOG_ERR, "isremote(): Unhandled address family %d\n", from_saddr->sa_family);
return -1;
}
if ( host_name != NULL ) {
FILE *fs;
char *cp ;
char s[CA_MAXHOSTNAMELEN+1];
#if defined(_WIN32)
char path[256];
#endif
/*
* Is the hostname declared as a "remote" site host ?
*/
#if defined(_WIN32)
strcpy(path, rthfile);
if( (strncmp(path, "%SystemRoot%\\", 13) == 0) && ((p = getenv ("SystemRoot")) != NULL) ) {
sprintf (rthfile, "%s\\%s", p, strchr (path, '\\'));
}
#endif
log(LOG_DEBUG,"isremote(): searching <%s> in %s\n",host_name, rthfile);
if ( (fs = fopen( rthfile, "r")) != NULL ) {
while ( fgets(s,CA_MAXHOSTNAMELEN+1,fs) != NULL ) {
if ( (cp= strtok(s," \n\t"))!=NULL ) {
if ( !isdigit(cp[0]) && (cp[0]!='#') && !strcmp(cp,host_name) ) {
log(LOG_DEBUG,"isremote(): %s is in list of external hosts\n",cp);
fclose(fs);
return 1;
}
if ( ipv4_avail && isdigit(cp[0]) && strchr(cp, ':') == NULL) {
strcpy(ent,cp) ;
if ( strtok(cp,".") == NULL ||
strtok(NULL,".") == NULL )
log(LOG_DEBUG,"%s ignored: IP specification too short\n", ent);
else {
if ( !strncmp( ent, inet_ntoa( from_host ), strlen(ent))) {
log(LOG_DEBUG,"Entry %s matches to %s\n",ent,inet_ntoa(from_host));
log(LOG_INFO,"isremote(): %s is classified as remote\n",host_name);
fclose(fs) ;
return 1 ;
}
}
} else if (match_ipv6_string(&from6_host, cp)) {
log(LOG_DEBUG,"Entry %s matches in remote host list\n",cp);
log(LOG_INFO,"isremote(): %s is classified as remote\n",host_name);
fclose(fs);
return 1;
}
}
}
fclose(fs);
}
/*
* Is the hostname declared local ?
*/
#if defined(_WIN32)
strcpy(path, lhfile);
if( (strncmp(path, "%SystemRoot%\\", 13) == 0) && ((p = getenv ("SystemRoot")) != NULL) ) {
sprintf (lhfile, "%s\\%s", p, strchr (path, '\\'));
}
#endif
log(LOG_DEBUG,"isremote(): searching <%s> in %s\n",host_name, lhfile);
if ( (fs = fopen( lhfile, "r")) != NULL ) {
while ( fgets(s,CA_MAXHOSTNAMELEN+1,fs) != NULL ) {
if ( (cp= strtok(s," \n\t")) != NULL ) {
if ( !isdigit(cp[0]) && (cp[0]!='#') && !strcmp(cp,host_name) ) {
log(LOG_DEBUG,"isremote(): %s is in list of local hosts\n",cp);
fclose(fs);
return 0;
}
if ( ipv4_avail && isdigit(cp[0]) && strchr(cp, ':') == NULL) {
strcpy(ent,cp) ;
if ( strtok(cp,".") == NULL ||
strtok(NULL,".") == NULL )
log(LOG_DEBUG,"%s ignored: IP specification too short \n", ent);
else {
if ( !strncmp( ent, inet_ntoa( from_host ), strlen(ent) )) {
log(LOG_DEBUG,"Entry %s matches to %s\n",ent,inet_ntoa(from_host));
log(LOG_DEBUG,"isremote(): %s is classified as local\n",host_name);
fclose (fs);
return 0 ;
}
}
} else if (match_ipv6_string(&from6_host, cp)) {
log(LOG_DEBUG,"Entry %s matches in local host list\n",cp);
log(LOG_DEBUG,"isremote(): %s is classified as local\n",host_name);
fclose(fs);
return 0;
}
}
}
fclose(fs);
}
} /* if ( host_name != NULL ) */
if (ipv4_avail) {
unsigned int netw = inet_netof(from_host);
log(LOG_DEBUG, "isremote(): Client host being tested is %s\n",inet_ntoa( from_host )) ;
log(LOG_DEBUG, "inet_netof() returned %u\n", netw);
} else {
char ip[INET6_ADDRSTRLEN];
const char *p;
p = inet_ntop(AF_INET6, &from6_host, ip, INET6_ADDRSTRLEN);
if (p != NULL)
log(LOG_DEBUG, "isremote(): Client host being tested is %s\n",p);
}
/* if the test address is IPv6 then immediately match special address types
*/
if (!ipv4_avail) {
if (IN6_IS_ADDR_LOOPBACK(&from6_host)) {
log(LOG_DEBUG,"isremote(): Is the IPv6 loopback address\n");
return 0;
}
if (IN6_IS_ADDR_LINKLOCAL(&from6_host)) {
log(LOG_DEBUG,"isremote(): Is an IPv6 link local address\n");
return 0;
}
if (IN6_IS_ADDR_SITELOCAL(&from6_host)) {
log(LOG_DEBUG,"isremote(): Is an IPv6 site local address\n");
return 0;
}
}
/* now scan all configured interfaces, trying to match the test address with
* the network portion of the interfaces addresses: if there is a match then
* report the test address is local
*/
memset(&data, '\0', sizeof(data));
data.ipv4_avail = ipv4_avail;
data.isremote = -1;
memcpy(&data.from_host,&from_host,sizeof(data.from_host));
memcpy(&data.from6_host,&from6_host,sizeof(data.from6_host));
(void) scan_interfaces(&data, &isremote_scan_cb);
if (data.isremote == 0) {
log(LOG_DEBUG,"isremote(): Is at our site according to interface scan\n");
return 0;
}
/* if we had a IPv6 address to test and yet did not find any IPv6 addresses
* via the interface scan, then try to lookup an IPv6 address for the
* local machine name and compare against that with an assumed prefix length of 64
*/
if (!ipv4_avail && data.number_of_ipv6_compared == 0) {
struct addrinfo hints, *aitop, *ai;
int gaierrno;
log(LOG_DEBUG,"isremote(): Did not find any IPv6 addresses any other way, looking up local host name %s\n", local);
memset(&hints, '\0', sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_STREAM;
gaierrno = Cgetaddrinfo(local, NULL, &hints, &aitop);
#ifdef EAI_NODATA
if (gaierrno == EAI_NONAME || gaierrno == EAI_NODATA) {
#else
if (gaierrno == EAI_NONAME) {
#endif
log(LOG_INFO,"isremote(): IPv6 is remote, no IPv6 address found for local machine\n");
return 1;
} else if (gaierrno != 0) {
log(LOG_ERR,"isremote(): Could not Cgetaddrinfo for local hostname %s\n", local);
return -1;
}
for(ai=aitop; ai; ai=ai->ai_next) {
if (match_ipv6(&from6_host, &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr, 0x40)) {
freeaddrinfo(aitop);
log(LOG_DEBUG,"isremote(): IPv6 peer is at our site, according to local hostname lookup\n");
return 0;
}
}
freeaddrinfo(aitop);
log(LOG_INFO ,"isremote(): IPv6 peer is at another site\n");
return 1;
}
log(LOG_INFO ,"isremote(): client is in another site\n");
return 1;
}
/*
* isremote(): returns 0 if requestor is in site
* 1 if requestor is out of site
* -1 in case of an error
*/
/* currently used in various places - not prototyped in any header files */
int DLL_DECL isremote(from_host, host_name)
struct in_addr *from_host;
char *host_name ;
{
struct sockaddr_in sin;
memset(&sin, '\0', sizeof(sin));
sin.sin_family = AF_INET;
memcpy(&sin.sin_addr, from_host, sizeof(struct in_addr));
return isremote_sa(&sin, host_name);
}
int DLL_DECL CDoubleDnsLookup(SOCKET s, char *host) {
static int key = -1;
const char *p;
p = Cgetnetaddress(s, NULL, 0, &key, NULL, NULL, NI_NAMEREQD, CNA_FWDLOOKUP);
if (!p) {
serrno = SENOSHOST;
return(-1);
}
strcpy(host, p);
return(0);
}
int DLL_DECL isadminhost(SOCKET s, char *peerhost) {
int i, rc;
#if defined(ADMIN_HOSTS)
char *defined_admin_hosts = ADMIN_HOSTS;
#endif /* ADMIN_HOSTS */
char *admin_hosts, *admin_host;
rc = CDoubleDnsLookup(s,peerhost);
if ( rc == -1 ) return(rc);
admin_host = admin_hosts = NULL;
if ( admin_hosts == NULL ) admin_hosts = getenv("ADMIN_HOSTS");
if ( admin_hosts == NULL ) admin_hosts = getconfent("ADMIN","HOSTS",1);
#if defined(ADMIN_HOSTS)
if ( admin_hosts == NULL ) admin_hosts = defined_admin_hosts;
#endif /* ADMIN_HOSTS */
if ( (admin_hosts != NULL) &&
((admin_host = strstr(admin_hosts,peerhost)) != NULL) ) {
i = strlen(peerhost);
if ( (admin_host[i] == '\0' ||
admin_host[i] == ' ' ||
admin_host[i] == '\t' ||
admin_host[i] == ',' ) &&
(admin_host == admin_hosts ||
admin_host[-1] == ' ' ||
admin_host[-1] == '\t' ||
admin_host[-1] == ',') ) return(0);
}
serrno = SENOTADMIN;
return(-1);
}
static int match_ipv6_string(const struct in6_addr *fa, const char *straddr) {
char *p,*dp,line[64];
struct in6_addr fb;
int prefixlen=128;
strncpy(line, straddr, sizeof(line));
line[sizeof(line)-1] = '\0';
if (strchr(line,':') == NULL) {
return 0;
}
if ((p=strchr(line,'/')) != NULL) {
*p++ = '\0';
prefixlen = strtol(p, &dp, 10);
if (*dp != '\0') return 0;
}
if (prefixlen<0 || prefixlen>128) prefixlen = 128;
if (inet_pton(AF_INET6, line, &fb) != 1) return 0;
return match_ipv6(fa,&fb,prefixlen);
}
static int match_ipv6(const struct in6_addr *fa_in, const struct in6_addr *fb_in, int prefixlen) {
unsigned char m;
struct in6_addr a6;
const struct in6_addr *fa, *fb;
char ip1[INET6_ADDRSTRLEN],ip2[INET6_ADDRSTRLEN];
if (inet_ntop(AF_INET6, fa_in, ip1, INET6_ADDRSTRLEN) &&
inet_ntop(AF_INET6, fb_in, ip2, INET6_ADDRSTRLEN)) {
log(LOG_DEBUG,"match_ipv6(): Comparing %s and %s\n", ip1, ip2);
}
fa = fa_in;
memcpy(&a6, fb_in, sizeof(a6));
fb = &a6;
/* always match v4mapped/v4compat combinations */
if ((IN6_IS_ADDR_V4MAPPED(fa) || IN6_IS_ADDR_V4COMPAT(fa)) &&
(IN6_IS_ADDR_V4MAPPED(fb) || IN6_IS_ADDR_V4COMPAT(fb))) {
a6.s6_addr[10] = fa->s6_addr[10];
a6.s6_addr[11] = fa->s6_addr[11];
}
if (prefixlen>=8 && memcmp(fa->s6_addr, fb->s6_addr, prefixlen/8)) return 0;
m = prefixlen%8;
if (m==0) return 1;
m = 8-m;
m = (1<<m) - 1;
m = ~m;
if ((fa->s6_addr[prefixlen/8]&m) != (fb->s6_addr[prefixlen/8]&m)) return 0;
return 1;
}
static int netmask_to_prefixlen(const struct in6_addr *a) {
int prefix = 0;
while(prefix<128 && a->s6_addr[prefix/8] == 0xff) prefix+=8;
if (prefix<128) {
unsigned char c = a->s6_addr[prefix/8];
while(c&0x80) { c<<=1; prefix++; }
}
if (prefix == 0) {
log(LOG_DEBUG , "netmask_to_prefixlen(): Found zero length prefix, using 64 instead\n");
prefix = 64;
}
return (prefix);
}
static void *next_xifr(void *xifr, const struct sockaddr *sa, size_t slen) {
size_t len;
if (xifr == NULL || sa == NULL)
return (NULL);
#if defined(_AIX) || defined(__APPLE__) || defined(__Lynx__) || defined(SIN6_LEN)
len = sa->sa_len;
len += (char *)sa - (char *)xifr;
#else
len = slen;
#endif
xifr = (void *)((char *) xifr + len);
return (xifr);
}
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