Thread: [networking] socket problem in bind() and recvfrom()

hi,
i have this piece of code:

Code:

/*       compilation options:   reset; gcc  -g -Wall -ansi -pedantic testes.c -o tt          */
#define _POSIX_C_SOURCE 200112L 
#define  _XOPEN_SOURCE 600
#define _BSD_SOURCE /*|| _SVID_SOURCE*/


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <limits.h>

#include <errno.h>

 #include <strings.h>

#define MAX_READ 100


int main(int argc, char **argv)
{
  
    struct sockaddr_in serv_addr;
    int sockfd, slen=sizeof(serv_addr);
    char command_string[] ="REG gu.sl;192.168.1.32;61000;60000";    
    char *saport="58000";
    char *IPserver="193.136.138.142";
    socklen_t len_inet;
    int z;
    int n;
    int addrlen;
    char receive[50];
   sockfd = socket(AF_INET, SOCK_DGRAM, 0);
   if ( sockfd == -1 ) 
   {
      printf("UDP socket() call failed to create");
    } 
    else 
    {
        printf("UDP socket created ping is %s \n", saport);
    }
 
 memset((void*)&serv_addr,(int)'\0', sizeof(serv_addr));
    /*bzero(&serv_addr, sizeof(serv_addr));*/
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(atoi(saport));
    if (inet_aton(IPserver, &serv_addr.sin_addr)==0)
    {
        fprintf(stderr, "inet_aton() failed\n");
        exit(1);
    }
    
    
     
    len_inet = sizeof(serv_addr);
    z = bind(sockfd, (struct sockaddr *)&serv_addr, len_inet);
    if ( z == -1) 
    {
        printf ("UDP ..Bind socket bind() failed\n");
        exit(EXIT_FAILURE);
    } 
    else 
    {
        printf("UDP socket bound to port \n");
    }
     
     printf("command_string=%s antes do sendto func\n",command_string);
    n = sendto(sockfd, command_string, strlen(command_string), 0, (struct sockaddr *)&serv_addr, len_inet);/* ver o zero dos flags, meter uma macro*/
    if(n==-1) exit(1);        
    
    /*memset(command_string, '0', MAX_READ );*/
   /* addrlen=sizeof(res);*/
    
    memset(command_string,'\0', sizeof(command_string));
    printf("command_string=%s ... func\n",command_string);
    
    n=recvfrom(sockfd,receive/*command_string*/, 50 /*sizeof(command_string)*/, 0, (struct sockaddr *)&serv_addr, &len_inet);/*ver se posso meter &(sizeof(res) em vez de addrlen)*/
      if(n==-1)exit(1);
      
      printf("command_string=%s ...\n",command_string);
      printf("receive=%s ...\n",receive); /*output must be :   DNS gu.sl;192.168.1.32;60000   */
      
      return 0;
    
  
  
}

i am not able to bind it nor to receive anything in the recvfrom and i dont know why. so is smb able to help me?

i thank you in advance for the help