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IP to string and break down the string

IP to string and break down the string

IP to string and break down the string

I want to take the ip i obtained and put it into a string that i can manipulate but i always get passing argument makes pointer from integer without a cast.  I am currently using lynix with gcc as my compiler here is the current code
the strcpy and sscanf lines is where it errors, it seems to work but would like to rid the errors.


#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include <string.h>

#define DEFAULT_UDP_PORT    1234

int main(int count, char *strings[])
{    int sd;
//    int i;        //use for counter
    int fport;      //from port
    int lastport = 0;    //set last port for compare to from port
    int uport;      //upper byte of from port
    int lport;      //lower byte of from port
    int sbytes = 20; //# of bytes to send back
    int users;    //number of users on irc server
    int port=DEFAULT_UDP_PORT;
    struct sockaddr_in addr;
    char buffer[32];    //receive buffer
    char sbuffer[32];    //send buffer
    char temp[32]={0x0};    //results of netstat
    char o1[5], o2[5], o3[5], o4[5];  //set string rep of each octet
    int io1, io2, io3, io4;        //set int value for each octet
        char uip[20];  //user ip

    if ( count != 2 )
        printf("usage: %s <port>\n...Using UDP default port (%d).\n", strings[0], port);
        port = atoi(strings[1]);
    sd = socket(PF_INET, SOCK_DGRAM, 0);
    bzero(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = INADDR_ANY;
    if ( bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0 )
    while (1)
    {    int bytes, addr_len=sizeof(addr);

        bytes = recvfrom(sd, buffer, sizeof(buffer), 0, (struct sockaddr*)&addr, &addr_len);

        //sscanf(inet_ntoa(addr.sin_addr), "%hu.%hu.%hu.%hu", &ip[0],&ip[1],&ip[2],&ip[3]);
                //this is where it errors

                //store each octet to individual strings?
                sscanf(inet_ntoa(addr.sin_addr), "%4[^.].%4[^.].%4[^.].%4[^.]", o1, o2, o3, o4);

        //set from port to port received from
}        fport = ntohs(addr.sin_port);

RE: IP to string and break down the string

thank you

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