Get local network interface addresses using only proc?

Question

How can I obtain the (IPv4) addresses for all network interfaces using only proc? After some extensive investigation I\'ve discovered the following:

Answer 1

ip -j -o -4 addr show dev eth0 | jq .[1].addr_info[0].local

Answer 2

There is no IPv4 analog of /proc/net/if_inet6

ifconfig does:

fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP)
ioctl(fd, SIOCGIFCONF, ...)

You'll get something like this:

ioctl(4, SIOCGIFCONF, {120, {{"lo", {AF_INET, inet_addr("127.0.0.1")}}, {"eth0", {AF_INET, inet_addr("10.6.23.69")}}, {"tun0", {AF_INET, inet_addr("10.253.10.151")}}}})

Answer 3

ip addr show dev eth0 | grep "inet " | cut -d ' ' -f 6  | cut -f 1 -d '/'