Linux Network Programming - Revision history

Heth: /* Python - hangs if interface link down */

2023-12-01T07:19:10Z

‎Python - hangs if interface link down

Heth: /* Python */

2023-12-01T07:18:20Z

‎Python

Heth at 12:29, 30 November 2023

2023-11-30T12:29:12Z

Heth: /* Find IP address of an interface */

2023-11-30T12:27:07Z

‎Find IP address of an interface

Heth: /* Find IP address of an interface */

2023-11-30T11:52:43Z

‎Find IP address of an interface

Heth: Created page with "=Find IP address of an interface= #include #include #include /* for strncpy */ #include #include #..."

2023-11-03T09:37:21Z

Created page with "=Find IP address of an interface= <source lang=c> #include <stdio.h> #include <unistd.h> #include <string.h> ‎for strncpy: #include <sys/types.h> #include <sys/socket.h> #..."

New page

=Find IP address of an interface=
<source lang=c>
#include <stdio.h>
#include <unistd.h>
#include <string.h> /* for strncpy */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <getopt.h>
int main(int argc, char *argv[]) {
int fd;
struct ifreq ifr;
if (argc != 2) {
fprintf(stderr,"Usage: %s interface\n",argv[0]);
return(1);
}
fd = socket(AF_INET, SOCK_DGRAM, 0);
/* I want to get an IPv4 IP address */
ifr.ifr_addr.sa_family = AF_INET;
/* I want IP address attached to interfacename in argv[1] */
strncpy(ifr.ifr_name, argv[1], IFNAMSIZ-1);
ioctl(fd, SIOCGIFADDR, &ifr);
close(fd);
/* display result */
printf("%s\n", inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr));
return 0;
}
</source>
[[Category:Linux]][[Category:C]]

@@ Line 31: / Line 31: @@
+}
 </source>
 ==Python - hangs if interface link down==
 Install '''netifaces''' either as apt module '''python3-netifaces''' or pip module '''netifaces'''

@@ Line 31: / Line 31: @@
+}
 </source>
-==Python==
+==Python - hangs if interface link down==
 Install '''netifaces''' either as apt module '''python3-netifaces''' or pip module '''netifaces'''
 <source lang=python>

@@ Line 74: / Line 74: @@
 print(get_ip_linux( "eth0"))  #Testing module
 </source>
 [[Category:Linux]][[Category:C]][[Category:Python]]

@@ Line 75: / Line 75: @@
 print(get_ip_linux( "eth0"))  #Testing module
 </source>
-[[Category:Linux]][[Category:C]]
+[[Category:Linux]][[Category:C]][[Category:Python]]

@@ Line 1: / Line 1: @@
 =Find IP address of an interface=
 <source lang=c>
 #include <stdio.h>
@@ Line 29: / Line 30: @@
   return 0;
+}
 </source>
 [[Category:Linux]][[Category:C]]