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Merge pull request #236 from CharmlessCoin/network

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Add get_broadcast()
This commit is contained in:
irungentoo 2013-08-01 04:19:17 -07:00
commit b553043b17
2 changed files with 64 additions and 2 deletions
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58
core/LAN_discovery.c
View File

@ -23,13 +23,67 @@
#include "LAN_discovery.h"
#define MAX_INTERFACES 16
#define ERR_INTERFACES 0
#define ERR_IOCTL 1
/*Return the broadcast ip
TODO: make it return the real one, not the 255.255.255.255 one.*/
#ifdef __linux
/* get the first running interface's broadcast IP,
* return is higher than 0 on success
* ERR_IOCTL on an ioctl error
* ERR_INTERFACES on general error */
uint32_t get_broadcast(void)
{
/* not sure how many platforms this will
* run on, so it's wrapped in __linux for now */
struct ifconf ifconf;
struct ifreq i_faces[MAX_INTERFACES];
int count = 0;
int sock = 0;
int i = 0;
struct sockaddr_in *sock_holder = NULL;
/* configure ifconf for the ioctl call */
sock = socket(AF_INET, SOCK_STREAM, 0);
ifconf.ifc_buf = (char *)i_faces;
ifconf.ifc_len = sizeof(i_faces);
count = ifconf.ifc_len / sizeof(i_faces[0]);
for(i = 0; i < count; i++) {
/* skip the loopback interface, as it's useless */
if(strcmp(i_faces[i].ifr_name, "lo") != 0) {
if(ioctl(sock, SIOCGIFBRDADDR, &i_faces[i]) < 0) {
perror("[!] get_broadcast: ioctl error");
return 0;
}
/* just to clarify where we're getting the values from */
sock_holder = (struct sockaddr_in *)&i_faces[i].ifr_broadaddr;
break;
}
}
close(sock);
if(sock_holder == NULL)
return ERR_INTERFACES;
return sock_holder->sin_addr.s_addr;
}
#endif
/* Return the broadcast ip */
IP broadcast_ip()
{
IP ip;
#ifdef __linux
ip.i = get_broadcast();
if(ip.i == ERR_INTERFACES)
ip.i = ~0;
else if(ip.i == ERR_IOCTL)
ip.i = 0;
#else
ip.i = ~0;
#endif
return ip;
}

8
core/LAN_discovery.h
View File

@ -28,6 +28,14 @@
#include "DHT.h"
/* used for get_broadcast() */
#ifdef __linux
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <linux/netdevice.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif