1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
// vim:ts=4:sw=4:expandtab
#include <sys/socket.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <ifaddrs.h>
#include "i3status.h"
static bool sysfs_devtype(char *dest, size_t n, const char *ifnam) {
FILE *fp;
char buf[1024];
snprintf(buf, sizeof(buf), "/sys/class/net/%s/uevent", ifnam);
if ((fp = fopen(buf, "r")) == NULL)
return false;
dest[0] = '\0';
while (fgets(buf, sizeof(buf), fp)) {
size_t slen;
char *s;
slen = strlen(buf);
/* Line is too long to fit in the buffer */
if (buf[slen - 1] != '\n' && !feof(fp))
break;
if ((s = strchr(buf, '='))) {
if (strncmp(buf, "DEVTYPE", s - buf))
continue;
buf[slen - 1] = '\0';
strncpy(dest, ++s, n);
break;
}
}
fclose(fp);
return true;
}
static net_type_t iface_type(const char *ifname) {
char devtype[32];
if (!sysfs_devtype(devtype, sizeof(devtype), ifname))
return NET_TYPE_OTHER;
if (!devtype[0])
return NET_TYPE_ETHERNET;
if (strcmp(devtype, "wlan") == 0)
return NET_TYPE_WIRELESS;
if (strcmp(devtype, "wwan") == 0)
return NET_TYPE_OTHER;
return NET_TYPE_OTHER;
}
const char *first_eth_interface(const net_type_t type) {
static char *interface = NULL;
struct ifaddrs *ifaddr, *addrp;
net_type_t iftype;
getifaddrs(&ifaddr);
if (ifaddr == NULL)
return NULL;
free(interface);
interface = NULL;
for (addrp = ifaddr;
addrp != NULL;
addrp = addrp->ifa_next) {
if (strncasecmp("lo", addrp->ifa_name, strlen("lo")) == 0)
continue;
if (addrp->ifa_addr == NULL)
continue;
// Skip PF_PACKET addresses (MAC addresses), as they are present on any
// ethernet interface.
if (addrp->ifa_addr->sa_family != AF_INET &&
addrp->ifa_addr->sa_family != AF_INET6)
continue;
// Skip this interface if it is a wireless interface.
iftype = iface_type(addrp->ifa_name);
if (iftype != type)
continue;
interface = strdup(addrp->ifa_name);
break;
}
freeifaddrs(ifaddr);
return interface;
}
|
