main.c

#include <netinet/in.h>
#include <resolv.h>
#include <string.h>

typedef union {
        HEADER qb1;
        u_char qb2[65536];
} querybuf;

int main(int argc, char **argv)
{
    int len;
    struct __res_state statp; 
    querybuf resbuf;

    memset(&statp, 0, sizeof(statp));
    if (res_ninit(&statp) < 0) {
        fprintf(stderr, "Can't initialize statp.\n");
        return (1);
    }

    statp.options |= RES_DEBUG;

    len = res_nsearch(&statp, "google.com", C_IN, T_ANY,
         resbuf.qb2, NS_MAXMSG);
    if (len < 0) {
        fprintf(stderr, "Error occured during search.\n");
        return (1);
    }
    if (len > NS_MAXMSG) {
        fprintf(stderr, "The buffer is too small.\n");
        return (1);
    }
    res_ndestroy(&statp);
    return (0);
}