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STABLE14-windows-afsdb-fix-20050701

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Fix AFSDB queries using DNSAPI to always terminate the query string with
a period.


(cherry picked from commit f6d99fbba133ba996610d0c00457408fede942dc)
This commit is contained in:
Jeffrey Altman 2005-07-02 03:46:28 +00:00
parent 08b798494e
commit 8b6b9ef33b
1 changed files with 61 additions and 55 deletions
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114
src/WINNT/afsd/cm_dns.c
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@ -702,76 +702,83 @@ int getAFSServer(char *cellName, int *cellHostAddrs, char cellHostNames[][MAXHOS
else
return 0;
#else /* DNSAPI_ENV */
PDNS_RECORD pDnsCell, pDnsIter, pDnsVol,pDnsVolIter, pDnsCIter;
DWORD i;
PDNS_RECORD pDnsCell, pDnsIter, pDnsVol,pDnsVolIter, pDnsCIter;
DWORD i;
struct sockaddr_in vlSockAddr;
char query[1024];
*numServers = 0;
*ttl = 0;
/* query the AFSDB records of cell */
if (DnsQuery_A(cellName, DNS_TYPE_AFSDB, DNS_QUERY_STANDARD, NULL, &pDnsCell, NULL) == ERROR_SUCCESS) {
strncpy(query, cellName, 1024);
query[1023] = 0;
if (query[strlen(query)-1] != '.') {
strncat(query,".",1024);
query[1023] = 0;
}
memset((void*) &vlSockAddr, 0, sizeof(vlSockAddr));
if (DnsQuery_A(query, DNS_TYPE_AFSDB, DNS_QUERY_STANDARD, NULL, &pDnsCell, NULL) == ERROR_SUCCESS) {
memset((void*) &vlSockAddr, 0, sizeof(vlSockAddr));
/* go through the returned records */
for (pDnsIter = pDnsCell;pDnsIter; pDnsIter = pDnsIter->pNext) {
/* if we find an AFSDB record with Preference set to 1, we found a volserver */
if (pDnsIter->wType == DNS_TYPE_AFSDB && pDnsIter->Data.Afsdb.wPreference == 1) {
strncpy(cellHostNames[*numServers], pDnsIter->Data.Afsdb.pNameExchange, MAXHOSTCHARS);
/* go through the returned records */
for (pDnsIter = pDnsCell;pDnsIter; pDnsIter = pDnsIter->pNext) {
/* if we find an AFSDB record with Preference set to 1, we found a volserver */
if (pDnsIter->wType == DNS_TYPE_AFSDB && pDnsIter->Data.Afsdb.wPreference == 1) {
strncpy(cellHostNames[*numServers], pDnsIter->Data.Afsdb.pNameExchange, MAXHOSTCHARS);
cellHostNames[*numServers][MAXHOSTCHARS-1]='\0';
(*numServers)++;
(*numServers)++;
if (!*ttl)
if (!*ttl)
*ttl = pDnsIter->dwTtl;
if (*numServers == AFSMAXCELLHOSTS)
if (*numServers == AFSMAXCELLHOSTS)
break;
}
}
}
}
for (i=0;i<*numServers;i++)
for (i=0;i<*numServers;i++)
cellHostAddrs[i] = 0;
/* now check if there are any A records in the results */
for (pDnsIter = pDnsCell; pDnsIter; pDnsIter = pDnsIter->pNext) {
if(pDnsIter->wType == DNS_TYPE_A)
/* check if its for one of the volservers */
for (i=0;i<*numServers;i++)
if(stricmp(pDnsIter->pName, cellHostNames[i]) == 0)
cellHostAddrs[i] = pDnsIter->Data.A.IpAddress;
}
/* now check if there are any A records in the results */
for (pDnsIter = pDnsCell; pDnsIter; pDnsIter = pDnsIter->pNext) {
if(pDnsIter->wType == DNS_TYPE_A)
/* check if its for one of the volservers */
for (i=0;i<*numServers;i++)
if(stricmp(pDnsIter->pName, cellHostNames[i]) == 0)
cellHostAddrs[i] = pDnsIter->Data.A.IpAddress;
}
for (i=0;i<*numServers;i++) {
/* if we don't have an IP yet, then we should try resolving the volserver hostname
in a separate query. */
if (!cellHostAddrs[i]) {
if (DnsQuery_A(cellHostNames[i], DNS_TYPE_A, DNS_QUERY_STANDARD, NULL, &pDnsVol, NULL) == ERROR_SUCCESS) {
for (pDnsVolIter = pDnsVol; pDnsVolIter; pDnsVolIter=pDnsVolIter->pNext) {
/* if we get an A record, keep it */
if (pDnsVolIter->wType == DNS_TYPE_A && stricmp(cellHostNames[i], pDnsVolIter->pName)==0) {
cellHostAddrs[i] = pDnsVolIter->Data.A.IpAddress;
break;
}
/* if we get a CNAME, look for a corresponding A record */
if (pDnsVolIter->wType == DNS_TYPE_CNAME && stricmp(cellHostNames[i], pDnsVolIter->pName)==0) {
for (pDnsCIter=pDnsVolIter; pDnsCIter; pDnsCIter=pDnsCIter->pNext) {
if (pDnsCIter->wType == DNS_TYPE_A && stricmp(pDnsVolIter->Data.CNAME.pNameHost, pDnsCIter->pName)==0) {
cellHostAddrs[i] = pDnsCIter->Data.A.IpAddress;
break;
}
}
if (cellHostAddrs[i])
for (i=0;i<*numServers;i++) {
/* if we don't have an IP yet, then we should try resolving the volserver hostname
in a separate query. */
if (!cellHostAddrs[i]) {
if (DnsQuery_A(cellHostNames[i], DNS_TYPE_A, DNS_QUERY_STANDARD, NULL, &pDnsVol, NULL) == ERROR_SUCCESS) {
for (pDnsVolIter = pDnsVol; pDnsVolIter; pDnsVolIter=pDnsVolIter->pNext) {
/* if we get an A record, keep it */
if (pDnsVolIter->wType == DNS_TYPE_A && stricmp(cellHostNames[i], pDnsVolIter->pName)==0) {
cellHostAddrs[i] = pDnsVolIter->Data.A.IpAddress;
break;
}
/* if we get a CNAME, look for a corresponding A record */
if (pDnsVolIter->wType == DNS_TYPE_CNAME && stricmp(cellHostNames[i], pDnsVolIter->pName)==0) {
for (pDnsCIter=pDnsVolIter; pDnsCIter; pDnsCIter=pDnsCIter->pNext) {
if (pDnsCIter->wType == DNS_TYPE_A && stricmp(pDnsVolIter->Data.CNAME.pNameHost, pDnsCIter->pName)==0) {
cellHostAddrs[i] = pDnsCIter->Data.A.IpAddress;
break;
}
}
if (cellHostAddrs[i])
break;
/* TODO: if the additional section is missing, then do another lookup for the CNAME */
}
}
/* we are done with the volserver lookup */
DnsRecordListFree(pDnsVol, DnsFreeRecordListDeep);
}
}
}
DnsRecordListFree(pDnsCell, DnsFreeRecordListDeep);
}
/* TODO: if the additional section is missing, then do another lookup for the CNAME */
}
}
/* we are done with the volserver lookup */
DnsRecordListFree(pDnsVol, DnsFreeRecordListDeep);
}
}
}
DnsRecordListFree(pDnsCell, DnsFreeRecordListDeep);
}
if ( *numServers > 0 )
return 0;
@ -779,5 +786,4 @@ int getAFSServer(char *cellName, int *cellHostAddrs, char cellHostNames[][MAXHOS
return -1;
#endif /* DNSAPI_ENV */
}
#endif /* AFS_AFSDB_ENV */