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  2. MIDRANGE-L
  3. March 2004

SOLVED - SQL FUNCTION to retrieve host name from an IP address in SELECT statement

Hi All

I finally got my getHost SQL function working. Here are the details:

C Source code:

/********************************************************/ /* Get host name for passed IP */ /********************************************************/ #include </netdb.h> #include <sys/param.h> #include <netinet/in.h> #include <stdlib.h> #include <stdio.h> #include <sqludf.h> #include <arpa/inet.h> #include <sys/socket.h> #define HEX00 '\x00'

void SQL_API_FN hostname (char *input, char *output, SQLUDF_TRAIL_ARGS_ALL) { int rc; struct in_addr internet_address; struct hostent hst_ent; struct hostent_data hst_ent_data; char dotted_decimal_address [16]; char host_name [MAXHOSTNAMELEN]; strcpy(dotted_decimal_address, input); memset(&hst_ent_data,HEX00,sizeof(struct hostent_data));

internet_address.s_addr=inet_addr(dotted_decimal_address);
if ((rc=gethostbyaddr_r((char *) &internet_address, sizeof(struct in_addr), AF_INET, &hst_ent, &hst_ent_data)) == -1) {
strcpy(output,input); } else { (void) memcpy((void *) host_name, (void *) hst_ent.h_name, MAXHOSTNAMELEN); strcpy(output,host_name); }





Here is the compile command:

CRTCMOD MODULE(QGPL/GPLCM04)

SRCFILE(QGPL/QCSRC) OUTPUT(*print)
DBGVIEW(*LIST)






Here is the create service program command:

CRTSRVPGM SRVPGM(QGPL/GPLCM04) EXPORT(*ALL)





Here is the CREATE FUNCTION SQL statement:


CREATE FUNCTION qgpl/gethost (

ip varchar(15) )

RETURNS varchar(132)

LANGUAGE c

external name 'QGPL/GPLCM04(hostname)'

DETERMINISTIC

PARAMETER STYLE DB2SQL

RETURNS NULL ON NULL INPUT

NO EXTERNAL ACTION

fenced


Here is the statement I use it in STRSQL:

select gethost(ip) from gplpfa10



It works nicely.


Thanx to all who helped, PLA






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