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address.c
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/*
* Copyright (C) 1998-2012 Luca Deri <[email protected]>
*
* http://www.ntop.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "ntop.h"
/* Global */
static char hex[] = "0123456789ABCDEF";
/* Forward */
static u_int _ns_get16(const u_char *src);
static int _ns_name_ntop(const u_char *src,
char *dst, size_t dstsiz);
static int _dn_skipname(const u_char *ptr, const u_char *eom); /* forward */
static int _ns_name_uncompress(const u_char *msg,
const u_char *eom, const u_char *src,
char *dst, size_t dstsiz);
static int _ns_name_unpack(const u_char *msg,
const u_char *eom, const u_char *src,
u_char *dst, size_t dstsiz);
static void updateDeviceHostNameInfo(HostAddr addr, char* symbolic, int actualDeviceId, int type);
static void updateHostNameInfo(HostAddr addr, char* symbolic, int type);
/* #define DNS_DEBUG */
/* #define MDNS_DEBUG */
typedef struct hostAddrList {
HostAddr addr;
struct hostAddrList *next, *prev;
} HostAddrList;
static HostAddrList *hostAddrList_head = NULL, *hostAddrList_tail = NULL;
typedef struct {
time_t dump_date;
char hostname[MAX_LEN_SYM_HOST_NAME];
} HostNameCache;
/* **************************************************** */
void cacheHostName(HostAddr *addr, char* symbolic) {
HostNameCache name;
datum data_data, key_data;
accessMutex(&myGlobals.serialLockMutex, "cacheHostName");
name.dump_date = myGlobals.actTime;
safe_snprintf(__FILE__, __LINE__, name.hostname, sizeof(name.hostname), "%s", symbolic);
key_data.dptr = (char*)addr, key_data.dsize = sizeof(HostAddr);
data_data.dptr = (char*)&name, data_data.dsize = (int)(strlen(name.hostname)+sizeof(name.dump_date)+1);
if(gdbm_store(myGlobals.resolverCacheFile, key_data, data_data, GDBM_REPLACE) != 0)
traceEvent(CONST_TRACE_ERROR, "While adding host name %s", symbolic);
// traceEvent(CONST_TRACE_INFO, "Cached host name %s", symbolic);
releaseMutex(&myGlobals.serialLockMutex);
}
/* **************************************************** */
char* getHostNameFromCache(HostAddr *addr, char *buf, u_int buf_len) {
char *ret;
datum return_data, key_data;
accessMutex(&myGlobals.serialLockMutex, "getHostNameFromCache");
key_data.dptr = (char*)addr, key_data.dsize = sizeof(HostAddr);
return_data = gdbm_fetch(myGlobals.resolverCacheFile, key_data);
if(return_data.dptr != NULL) {
HostNameCache *dump = (HostNameCache*)return_data.dptr;
safe_snprintf(__FILE__, __LINE__, buf, buf_len, "%s", dump->hostname);
free(return_data.dptr);
ret = buf;
} else {
/* Not found */
ret = NULL;
}
releaseMutex(&myGlobals.serialLockMutex);
// traceEvent(CONST_TRACE_INFO, "Resolved %s", ret ? ret : "<none>");
return(ret);
}
/* **************************************** */
void initAddressResolution(void) {
createCondvar(&myGlobals.queueAddressCondvar);
}
/* **************************************** */
static void updateDeviceHostNameInfo(HostAddr addr, char* symbolic, int actualDeviceId, int type) {
HostTraffic *el;
if(myGlobals.ntopRunState > FLAG_NTOPSTATE_RUN) return;
/* Search the instance and update its name */
for(el=getFirstHost(actualDeviceId); el != NULL; el = getNextHost(actualDeviceId, el)) {
if(addrcmp(&el->hostIpAddress, &addr) == 0) {
accessAddrResMutex("updateHostNameInfo");
if(el != NULL) {
unsigned short i;
if(strlen(symbolic) >= (MAX_LEN_SYM_HOST_NAME-1))
symbolic[MAX_LEN_SYM_HOST_NAME-2] = '\0';
/* Really needed ? */
for(i=0; i<strlen(symbolic); i++) symbolic[i] = tolower(symbolic[i]);
/* traceEvent(CONST_TRACE_INFO, "[%s] --> %s", el->hostResolvedName, symbolic); */
setResolvedName(el, symbolic, type);
}
releaseAddrResMutex();
}
}
}
/* **************************************** */
static void updateHostNameInfo(HostAddr addr, char* symbolic, int type) {
int i;
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "updateDeviceHostNameInfo(%s <--> %s)", symbolic, addrtostr(&addr));
#endif
cacheHostName(&addr, symbolic);
for(i=0; i<myGlobals.numDevices; i++) {
if(!myGlobals.device[i].virtualDevice)
updateDeviceHostNameInfo(addr, symbolic, i, type);
}
}
/* ************************************ */
static void queueAddress(HostAddr elem) {
HostAddrList *cloned = NULL;
if(myGlobals.runningPref.numericFlag == noDnsResolution) return;
if(_pseudoLocalAddress(&elem, NULL, NULL)) {
/* Local Host */
if(myGlobals.runningPref.trackOnlyLocalHosts) return;
else if(myGlobals.runningPref.numericFlag == dnsResolutionForLocalRemoteOnly) return;
} else {
/* Remote Host */
if(myGlobals.runningPref.numericFlag == dnsResolutionForLocalHostsOnly) return;
}
accessAddrResMutex("queueAddress");
if(myGlobals.addressQueuedCurrent > 16384) {
myGlobals.addressUnresolvedDrops++;
} else {
/* First check if the address we want to resolve is already in queue
waiting to be resolved */
HostAddrList *head = hostAddrList_head;
while(head != NULL) {
if(memcmp(&head->addr, &elem, sizeof(elem)) == 0) {
releaseAddrResMutex();
return;
}
head = head->next;
}
#ifdef DEBUG
traceEvent(CONST_TRACE_ERROR, "queueAddress(%s)", addrtostr(&elem));
#endif
if((cloned = (HostAddrList*)calloc(1, sizeof(HostAddrList))) != NULL) {
memcpy(&cloned->addr, &elem, sizeof(HostAddr));
if(hostAddrList_head) hostAddrList_head->prev = cloned;
cloned->next = hostAddrList_head, cloned->prev = NULL;
hostAddrList_head = cloned;
if(hostAddrList_tail == NULL)
hostAddrList_tail = cloned; /* First element of the list */
signalCondvar(&myGlobals.queueAddressCondvar, 0);
myGlobals.addressQueuedCurrent++;
if(myGlobals.addressQueuedCurrent > myGlobals.addressQueuedMax)
myGlobals.addressQueuedMax = myGlobals.addressQueuedCurrent;
}
}
releaseAddrResMutex();
}
/* ************************************ */
static void processAddressResRequest(HostAddrList *elem) {
if(elem) {
struct hostent *he = NULL;
int family, size;
char theAddr[64];
#if defined(HAVE_GETHOSTBYADDR_R)
struct hostent _hp, *__hp;
char buffer[4096]; /* It MUST be 4096 as otherwise on Linux will fail */
#endif
memset(theAddr, 0, sizeof(theAddr));
addrget(&elem->addr, theAddr, &family, &size);
#if defined(HAVE_GETHOSTBYADDR_R)
#ifdef SOLARIS
he = gethostbyaddr_r((const char*)theAddr, size,
family, &_hp,
buffer, sizeof(buffer),
&h_errno);
#else
#if 0
traceEvent(CONST_TRACE_INFO, "About to resolve %s [family=%d][size=%d]", addrtostr(&elem->addr), family, size);
#endif
if(gethostbyaddr_r((const char*)theAddr, size,
family, &_hp,
buffer, sizeof(buffer),
&__hp, &h_errno) == 0) {
if(h_errno == 0)
he = &_hp;
else
he = NULL;
} else
he = NULL;
#endif
#else
he = gethostbyaddr(theAddr, size, family);
#endif
if((he != NULL) && (he->h_name != NULL)) {
updateHostNameInfo(elem->addr, he->h_name, FLAG_HOST_SYM_ADDR_TYPE_NAME);
accessAddrResMutex("dequeueAddress"); myGlobals.resolvedAddresses++; releaseAddrResMutex();
} else {
#if 0
traceEvent(CONST_TRACE_ERROR, "Address resolution failure [%d][%s]", h_errno, hstrerror(h_errno));
#endif
accessAddrResMutex("dequeueAddress"); myGlobals.failedResolvedAddresses++; releaseAddrResMutex();
}
memset(elem, 0, sizeof(HostAddr));
free(elem);
}
}
/* ************************************ */
static void* dequeueNextAddress(void) {
HostAddrList *elem;
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "DEBUG: Waiting for address to resolve...");
#endif
while(hostAddrList_tail == NULL) {
if(myGlobals.ntopRunState > FLAG_NTOPSTATE_RUN) break;
waitCondvar(&myGlobals.queueAddressCondvar);
}
#ifdef DEBUG
traceEvent(CONST_TRACE_INFO, "DEBUG: Address resolution started...");
#endif
accessAddrResMutex("dequeueAddress");
if(hostAddrList_tail != NULL) {
elem = hostAddrList_tail;
hostAddrList_tail = hostAddrList_tail->prev;
if(hostAddrList_head == elem)
hostAddrList_head = NULL;
if(elem->prev != NULL)
elem->prev->next = NULL;
if(myGlobals.addressQueuedCurrent > 0) myGlobals.addressQueuedCurrent--;
} else
elem = NULL;
releaseAddrResMutex();
return(elem);
}
/* ************************************ */
void* dequeueAddress(void *_i) {
int dqaIndex = (int)((long)_i);
HostAddrList *elem;
traceEvent(CONST_TRACE_INFO,
"THREADMGMT[t%lu]: DNSAR(%d): Address resolution thread running",
(long unsigned int)pthread_self(), dqaIndex+1);
while(myGlobals.ntopRunState <= FLAG_NTOPSTATE_RUN) {
elem = dequeueNextAddress();
processAddressResRequest(elem);
} /* endless loop */
myGlobals.dequeueAddressThreadId[dqaIndex] = 0;
/* We're shutting down so let'e empty the queue */
do {
elem = dequeueNextAddress();
if(elem != NULL)
free(elem);
} while(elem != NULL);
traceEvent(CONST_TRACE_INFO, "THREADMGMT[t%lu]: DNSAR(%d): Address resolution thread terminated [p%d]",
(long unsigned int)pthread_self(), dqaIndex+1,
#ifndef WIN32
getpid()
#else
0
#endif
);
return(NULL);
}
/* ************************************ */
void cleanupAddressQueue(void) {
/* Nothing to do */
}
/* ************************************ */
char* _intop(struct in6_addr *addr, char *buf, u_short buflen) {
char *ret = (char *)inet_ntop(AF_INET6, addr, buf, buflen);
return(ret);
}
/* ************************************ */
char* intop(struct in6_addr *addr) {
static char ntop_buf[INET6_ADDRSTRLEN+1];
memset(ntop_buf, 0, INET6_ADDRSTRLEN);
return (char *)_intop(addr, ntop_buf,sizeof(ntop_buf));
}
/* ************************************ */
/*
* A faster replacement for inet_ntoa().
*/
char* _intoa(struct in_addr addr, char* buf, u_short bufLen) {
char *cp, *retStr;
u_int byte;
int n;
cp = &buf[bufLen];
*--cp = '\0';
n = 4;
do {
byte = addr.s_addr & 0xff;
*--cp = byte % 10 + '0';
byte /= 10;
if (byte > 0) {
*--cp = byte % 10 + '0';
byte /= 10;
if (byte > 0)
*--cp = byte + '0';
}
*--cp = '.';
addr.s_addr >>= 8;
} while (--n > 0);
/* Convert the string to lowercase */
retStr = (char*)(cp+1);
return(retStr);
}
/* ************************************ */
char* intoa(struct in_addr addr) {
static char buf[sizeof "ff:ff:ff:ff:ff:ff:255.255.255.255"];
return(_intoa(addr, buf, sizeof(buf)));
}
/* ************************************ */
char* addrtostr(HostAddr *addr) {
if (addr == NULL)
return NULL;
switch(addr->hostFamily) {
case AF_INET:
return(char *)(intoa(addr->Ip4Address));
case AF_INET6:
return(char *)(intop(&addr->Ip6Address));
default: return("???");
}
}
/* ************************************ */
char * _addrtostr(HostAddr *addr, char* buf, u_short bufLen) {
if (addr == NULL)
return NULL;
switch(addr->hostFamily) {
case AF_INET:
return (_intoa(addr->Ip4Address,buf,bufLen));
case AF_INET6:
return (_intop(&addr->Ip6Address,buf,bufLen));
default: return("???");
}
}
/* ************************************ */
char * _addrtonum(HostAddr *addr, char* buf, u_short bufLen) {
if((addr == NULL) || (buf == NULL))
return NULL;
switch(addr->hostFamily) {
case AF_INET:
safe_snprintf(__FILE__, __LINE__, buf, bufLen, "%u", addr->Ip4Address.s_addr);
break;
case AF_INET6:
if(_intop(&addr->Ip6Address, buf, bufLen) == NULL)
BufferTooSmall(buf, bufLen);
break;
default:
return("???");
}
return(buf);
}
/* ******************************* */
/* This function automatically updates the instance name */
void ipaddr2str(HostTraffic *el, HostAddr hostIpAddress,
short vlanId, u_int actualDeviceId) {
HostTraffic *h;
if(((hostIpAddress.hostFamily == AF_INET) && (hostIpAddress.addr._hostIp4Address.s_addr == 0))
|| (el->hostResolvedNameType == FLAG_HOST_SYM_ADDR_TYPE_NAME))
return;
h = findHostByNumIP(hostIpAddress, vlanId, actualDeviceId);
if((el != NULL) && (h != NULL)
/* && (el != h) */
&& (h->hostResolvedNameType == FLAG_HOST_SYM_ADDR_TYPE_NAME)
&& (h->hostNumIpAddress[0] != '\0')
&& strcmp(h->hostNumIpAddress, h->hostResolvedName)
&& strcmp(h->hostResolvedName, "0.0.0.0")) {
#ifdef DEBUG
traceEvent(CONST_TRACE_ERROR, "Recycling %s = %s ", addrtostr(&hostIpAddress), el->hostResolvedName);
#endif
strcpy(el->hostResolvedName, h->hostResolvedName), el->hostResolvedNameType = h->hostResolvedNameType;
} else if(getHostNameFromCache(&el->hostIpAddress, el->hostResolvedName, sizeof(el->hostResolvedName)) != NULL) {
el->hostResolvedNameType = FLAG_HOST_SYM_ADDR_TYPE_NAME;
} else
queueAddress(hostIpAddress);
}
/* ************************************ */
char* etheraddr_string(const u_char *ep, char *buf) {
sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
ep[0] & 0xFF, ep[1] & 0xFF,
ep[2] & 0xFF, ep[3] & 0xFF,
ep[4] & 0xFF, ep[5] & 0xFF);
return (buf);
}
/* ************************************ */
char* llcsap_string(u_char sap) {
char *cp;
static char buf[sizeof("sap 00")];
cp = buf;
strncpy(cp, "sap ", sizeof(buf));
cp += strlen(cp);
*cp++ = hex[sap >> 4 & 0xf];
*cp++ = hex[sap & 0xf];
*cp++ = '\0';
/* traceEvent(CONST_TRACE_INFO, "%s", buf); */
return(buf);
}
/* ************************************ */
/*
The FDDI code below has been grabbed from
tcpdump
*/
static u_char fddi_bit_swap[] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};
void extract_fddi_addrs(struct fddi_header *fddip, char *fsrc, char *fdst)
{
int i;
for (i = 0; i < 6; ++i)
fdst[i] = fddi_bit_swap[fddip->dhost[i]];
for (i = 0; i < 6; ++i)
fsrc[i] = fddi_bit_swap[fddip->shost[i]];
}
/* ************************************ */
static u_int _ns_get16(const u_char *src) {
u_int dst;
NS_GET16(dst, src);
return (dst);
}
/* ************************************ */
int printable(int ch) {
return (ch > 0x20 && ch < 0x7f);
}
/* ************************************ */
static int special(int ch) {
switch (ch) {
case 0x22: /* '"' */
case 0x2E: /* '.' */
case 0x3B: /* ';' */
case 0x5C: /* '\\' */
/* Special modifiers in zone files. */
case 0x40: /* '@' */
case 0x24: /* '$' */
return (1);
default:
return (0);
}
}
/* ************************************ */
static int _ns_name_ntop(const u_char *src,
char *dst, size_t dstsiz) {
const u_char *cp;
char *dn, *eom;
u_char c;
u_int n;
static char digits[] = "0123456789";
cp = src;
dn = dst;
eom = dst + dstsiz;
while ((n = *cp++) != 0) {
if ((n & NS_CMPRSFLGS) != 0) {
/* Some kind of compression pointer. */
errno = EMSGSIZE;
return (-1);
}
if (dn != dst) {
if (dn >= eom) {
errno = EMSGSIZE;
return (-1);
}
*dn++ = '.';
}
if (dn + n >= eom) {
errno = EMSGSIZE;
return (-1);
}
for (; n > 0; n--) {
c = *cp++;
if (special(c)) {
if (dn + 1 >= eom) {
errno = EMSGSIZE;
return (-1);
}
*dn++ = '\\';
*dn++ = (char)c;
} else if (!printable(c)) {
if (dn + 3 >= eom) {
errno = EMSGSIZE;
return (-1);
}
*dn++ = '\\';
*dn++ = digits[c / 100];
*dn++ = digits[(c % 100) / 10];
*dn++ = digits[c % 10];
} else {
if (dn >= eom) {
errno = EMSGSIZE;
return (-1);
}
*dn++ = (char)c;
}
}
}
if (dn == dst) {
if (dn >= eom) {
errno = EMSGSIZE;
return (-1);
}
*dn++ = '.';
}
if (dn >= eom) {
errno = EMSGSIZE;
return (-1);
}
*dn++ = '\0';
return((int)(dn - dst));
}
/* ************************************ */
static char* _res_skip_rr(char *cp, char *eom) {
int tmp;
int dlen;
if ((tmp = _dn_skipname((u_char *)cp, (u_char *)eom)) == -1)
return (NULL); /* compression error */
cp += tmp;
if ((cp + RRFIXEDSZ) > eom)
return (NULL);
cp += INT16SZ; /* type */
cp += INT16SZ; /* class */
cp += INT32SZ; /* ttl */
dlen = _ns_get16((u_char*)cp);
cp += INT16SZ; /* dlen */
cp += dlen;
if (cp > eom)
return (NULL);
return (cp);
}
/* ************************************ */
static int dn_expand_(const u_char *msg, const u_char *eom, const u_char *src,
char *dst, int dstsiz) {
int n = _ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
if (n > 0 && dst[0] == '.')
dst[0] = '\0';
return (n);
}
/* ************************************ */
static int _ns_name_unpack(const u_char *msg,
const u_char *eom, const u_char *src,
u_char *dst, size_t dstsiz) {
const u_char *srcp, *dstlim;
u_char *dstp;
int n, len, checked;
len = -1;
checked = 0;
dstp = dst;
srcp = src;
dstlim = dst + dstsiz;
if (srcp < msg || srcp >= eom) {
errno = EMSGSIZE;
return (-1);
}
/* Fetch next label in domain name. */
while ((n = *srcp++) != 0) {
/* Check for indirection. */
switch (n & NS_CMPRSFLGS) {
case 0:
/* Limit checks. */
if (dstp + n + 1 >= dstlim || srcp + n >= eom) {
errno = EMSGSIZE;
return (-1);
}
checked += n + 1;
*dstp++ = n;
memcpy(dstp, srcp, n);
dstp += n;
srcp += n;
break;
case NS_CMPRSFLGS:
if (srcp >= eom) {
errno = EMSGSIZE;
return (-1);
}
if (len < 0)
len = (int)(srcp - src + 1);
srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
if (srcp < msg || srcp >= eom) { /* Out of range. */
errno = EMSGSIZE;
return (-1);
}
checked += 2;
/*
* Check for loops in the compressed name;
* if we've looked at the whole message,
* there must be a loop.
*/
if (checked >= eom - msg) {
errno = EMSGSIZE;
return (-1);
}
break;
default:
errno = EMSGSIZE;
return (-1); /* flag error */
}
}
*dstp = '\0';
if (len < 0)
len = (int)(srcp - src);
return (len);
}
/* ************************************ */
static int _ns_name_uncompress(const u_char *msg,
const u_char *eom, const u_char *src,
char *dst, size_t dstsiz) {
u_char tmp[NS_MAXCDNAME];
int n;
if ((n = _ns_name_unpack(msg, eom, src, tmp, sizeof tmp)) == -1)
return (-1);
if (_ns_name_ntop(tmp, dst, dstsiz) == -1)
return (-1);
return (n);
}
/* ************************************ */
static int _ns_name_skip(const u_char **ptrptr, const u_char *eom) {
const u_char *cp;
u_int n;
cp = *ptrptr;
while (cp < eom && (n = *cp++) != 0) {
/* Check for indirection. */
switch (n & NS_CMPRSFLGS) {
case 0: /* normal case, n == len */
cp += n;
continue;
case NS_CMPRSFLGS: /* indirection */
cp++;
break;
default: /* illegal type */
errno = EMSGSIZE;
return (-1);
}
break;
}
if (cp > eom) {
errno = EMSGSIZE;
return (-1);
}
*ptrptr = cp;
return (0);
}
/* ************************************ */
static int _dn_skipname(const u_char *ptr, const u_char *eom) {
const u_char *saveptr = ptr;
if (_ns_name_skip(&ptr, eom) == -1)
return (-1);
return((int)(ptr - saveptr));
}
/* ************************************ */
static void msdns_filter_name(char *msg) {
int i, j, max = (int)strlen(msg);
for(i=0, j=0; i<max; i++) {
#ifdef MDNS_DEBUG
if(0) traceEvent(CONST_TRACE_INFO, "DNS_DEBUG: [i=%d][%c][%d]", i, msg[i], msg[i]);
#endif
if(msg[i] != '\\') {
if(msg[i] > 0) /* FIX: can we do better? */
msg[j++] = msg[i];
} else {
char tmpStr[8], tmpStr2[8];
int id;
if((msg[i+1] >= '0') && (msg[i+1] <= '9')) {
#ifdef MDNS_DEBUG
if(0){
traceEvent(CONST_TRACE_INFO, "DNS_DEBUG: [i=%d][%c][%d]", i+1, msg[i+1], msg[i+1]);
traceEvent(CONST_TRACE_INFO, "DNS_DEBUG: [i=%d][%c][%d]", i+2, msg[i+2], msg[i+2]);
traceEvent(CONST_TRACE_INFO, "DNS_DEBUG: [i=%d][%c][%d]", i+3, msg[i+3], msg[i+3]);
}
#endif
tmpStr[0] = msg[i+1];
tmpStr[1] = msg[i+2];
tmpStr[2] = msg[i+3];
tmpStr[3] = '\0';
id = atoi(tmpStr);
if(id == 128)
msg[j++] = '\'';
else if(id < 128) {
safe_snprintf(__FILE__, __LINE__, tmpStr2, sizeof(tmpStr2), "%c", id);
msg[j++] = tmpStr2[0];
}
i += 3;
} else {
i++;
msg[j++] = msg[i];
}
}
}
msg[j] = '\0';
}
/* ************************************ */
static char* _res_skip(char *msg,
int numFieldsToSkip,
char *eom) {
char *cp;
HEADER *hp;
int tmp;
int n;
/*
* Skip the header fields.
*/
hp = (HEADER *)msg;
cp = msg + HFIXEDSZ;
/*
* skip question records.
*/
n = (int)ntohs((unsigned short int)hp->qdcount);
if (n > 0) {
while (--n >= 0 && cp < eom) {
tmp = _dn_skipname((u_char *)cp, (u_char *)eom);
if (tmp == -1) return(NULL);
cp += tmp;
cp += INT16SZ; /* type */
cp += INT16SZ; /* class */
}
}
if (--numFieldsToSkip <= 0) return(cp);
/*
* skip myGlobals.authoritative answer records
*/
n = (int)ntohs((unsigned short int)hp->ancount);
if (n > 0) {
while (--n >= 0 && cp < eom) {
cp = _res_skip_rr(cp, eom);
if (cp == NULL) return(NULL);
}
}
if (--numFieldsToSkip == 0) return(cp);
/*
* skip name server records
*/
n = (int)ntohs((unsigned short int)hp->nscount);
if (n > 0) {
while (--n >= 0 && cp < eom) {
cp = _res_skip_rr(cp, eom);
if (cp == NULL) return(NULL);
}
}
if (--numFieldsToSkip == 0) return(cp);
/*
* skip additional records
*/
n = (int)ntohs((unsigned short int)hp->arcount);
if (n > 0) {
while (--n >= 0 && cp < eom) {
cp = _res_skip_rr(cp, eom);
if (cp == NULL) return(NULL);
}
}
return(cp);
}
/* ************************************ */
void setHostName(HostTraffic *srcHost, char *name) {
u_short tmpStrLen = min(strlen(name), MAX_LEN_SYM_HOST_NAME);
strncpy(srcHost->hostResolvedName, name, tmpStrLen);
srcHost->hostResolvedName[tmpStrLen] = '\0';
}
/* ************************************ */
//#define MDNS_DEBUG
static void handleMdnsName(HostTraffic *srcHost, u_short sport, u_char *mdns_name) {
char *mdnsStrtokState, *name = NULL, *appl = NULL, *proto = NULL, *domain = NULL;
char *tmpStr = strdup((char*)mdns_name);
if(tmpStr != NULL) {
msdns_filter_name(tmpStr);
/* S's Music._daap._tcp.localcal */
#ifdef MDNS_DEBUG
traceEvent(CONST_TRACE_INFO, "DNS_DEBUG: (1) [%s]", tmpStr);
#endif
name = strtok_r(tmpStr, "._", &mdnsStrtokState);
if(name) {
appl = strtok_r(NULL, "._", &mdnsStrtokState);
if(appl) {
proto = strtok_r(NULL, "._", &mdnsStrtokState);
if(proto) {
domain = strtok_r(NULL, "._", &mdnsStrtokState);
}
}
}
if((domain != NULL)
&& ((!strcmp(domain, "local"))
|| (!strcmp(domain, "localafpovertcp"))
)) {
#ifdef MDNS_DEBUG
traceEvent(CONST_TRACE_INFO, "DNS_DEBUG: (2) [%s] [%s][%s][%s][%s]",
srcHost->hostNumIpAddress,
name, appl, proto, domain);
#endif
if((!strcmp(appl, "ipp")) || (!strcmp(appl, "printer"))) {