lib/interfaces.c

ソースコードを見る。

関数
static int	_get_interfaces (struct iface_struct *ifaces, int max_interfaces)
static int	iface_comp (struct iface_struct *i1, struct iface_struct *i2)
int	get_interfaces (struct iface_struct *ifaces, int max_interfaces)
int	main ()

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関数

static int _get_interfaces	(	struct iface_struct *	ifaces,
		int	max_interfaces
	)			[static]

interfaces.c の 95 行で定義されています。

参照先 fd・iface_struct::ip・iface_struct::name・name・iface_struct::netmask・total.

参照元 get_interfaces().

{  
        struct ifconf ifc;
        char buff[8192];
        int fd, i, n;
        struct ifreq *ifr=NULL;
        int total = 0;
        struct in_addr ipaddr;
        struct in_addr nmask;
        char *iname;

        if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
                return -1;
        }
  
        ifc.ifc_len = sizeof(buff);
        ifc.ifc_buf = buff;

        if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
                close(fd);
                return -1;
        } 

        ifr = ifc.ifc_req;
  
        n = ifc.ifc_len / sizeof(struct ifreq);

        /* Loop through interfaces, looking for given IP address */
        for (i=n-1;i>=0 && total < max_interfaces;i--) {
                if (ioctl(fd, SIOCGIFADDR, &ifr[i]) != 0) {
                        continue;
                }

                iname = ifr[i].ifr_name;
                ipaddr = (*(struct sockaddr_in *)&ifr[i].ifr_addr).sin_addr;

                if (ioctl(fd, SIOCGIFFLAGS, &ifr[i]) != 0) {
                        continue;
                }  

                if (!(ifr[i].ifr_flags & IFF_UP)) {
                        continue;
                }

                if (ioctl(fd, SIOCGIFNETMASK, &ifr[i]) != 0) {
                        continue;
                }  

                nmask = ((struct sockaddr_in *)&ifr[i].ifr_addr)->sin_addr;

                strncpy(ifaces[total].name, iname, sizeof(ifaces[total].name)-1);
                ifaces[total].name[sizeof(ifaces[total].name)-1] = 0;
                ifaces[total].ip = ipaddr;
                ifaces[total].netmask = nmask;
                total++;
        }

        close(fd);

        return total;
}  

static int iface_comp	(	struct iface_struct *	i1,
		struct iface_struct *	i2
	)			[static]

interfaces.c の 354 行で定義されています。

参照先 iface_struct::ip・iface_struct::name・iface_struct::netmask.

参照元 get_interfaces().

{
        int r;
        r = strcmp(i1->name, i2->name);
        if (r) return r;
        r = ntohl(i1->ip.s_addr) - ntohl(i2->ip.s_addr);
        if (r) return r;
        r = ntohl(i1->netmask.s_addr) - ntohl(i2->netmask.s_addr);
        return r;
}

int get_interfaces	(	struct iface_struct *	ifaces,
		int	max_interfaces
	)

interfaces.c の 368 行で定義されています。

参照先 _get_interfaces()・iface_comp().

参照元 get_my_ip_address()・interfaces_changed()・is_myname_or_ipaddr()・load_interfaces()・main().

{
        int total, i, j;

        total = _get_interfaces(ifaces, max_interfaces);
        if (total <= 0) return total;

        /* now we need to remove duplicates */
        qsort(ifaces, total, sizeof(ifaces[0]), QSORT_CAST iface_comp);

        for (i=1;i<total;) {
                if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
                        for (j=i-1;j<total-1;j++) {
                                ifaces[j] = ifaces[j+1];
                        }
                        total--;
                } else {
                        i++;
                }
        }

        return total;
}

int main

(

void

)

interfaces.c の 396 行で定義されています。

参照先 get_interfaces()・iface_struct::ip・iface_struct::netmask・printf().

{
        struct iface_struct ifaces[MAX_INTERFACES];
        int total = get_interfaces(ifaces, MAX_INTERFACES);
        int i;

        printf("got %d interfaces:\n", total);
        if (total <= 0) exit(1);

        for (i=0;i<total;i++) {
                printf("%-10s ", ifaces[i].name);
                printf("IP=%s ", inet_ntoa(ifaces[i].ip));
                printf("NETMASK=%s\n", inet_ntoa(ifaces[i].netmask));
        }
        return 0;
}

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