diff options
| -rw-r--r-- | toys/other/ifconfig.c | 58 |
1 files changed, 37 insertions, 21 deletions
diff --git a/toys/other/ifconfig.c b/toys/other/ifconfig.c index 92085d0c..38d2f64b 100644 --- a/toys/other/ifconfig.c +++ b/toys/other/ifconfig.c @@ -12,20 +12,38 @@ config IFCONFIG bool "ifconfig" default y help - usage: ifconfig [-a] interface [address] - - Configure network interface. - - [add ADDRESS[/PREFIXLEN]] - [del ADDRESS[/PREFIXLEN]] - [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]] - [netmask ADDRESS] [dstaddr ADDRESS] - [outfill NN] [keepalive NN] - [hw ether|infiniband ADDRESS] [metric NN] [mtu NN] - [[-]trailers] [[-]arp] [[-]allmulti] - [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic] - [mem_start NN] [io_addr NN] [irq NN] - [up|down] ... + usage: ifconfig [-a] [INTERFACE [ACTION...]] + + Display or configure network interface. + + With no arguments, display active interfaces. First argument is interface + to operate on, one argument by itself displays that interface. + + -a Show all interfaces, not just active ones + + Additional arguments are actions to perform on the interface: + + ADDRESS[/NETMASK] - set IPv4 address (1.2.3.4/5) + default - unset ipv4 address + add|del ADDRESS[/PREFIXLEN] - add/remove IPv6 address (1111::8888/128) + up - enable interface + down - disable interface + + netmask|broadcast|pointopoint ADDRESS - set more IPv4 characteristics + hw ether|infiniband ADDRESS - set LAN hardware address (AA:BB:CC...) + txqueuelen LEN - number of buffered packets before output blocks + mtu LEN - size of outgoing packets (Maximum Transmission Unit) + + Flags you can set on an interface (or -remove by prefixing with -): + arp - don't use Address Resolution Protocol to map LAN routes + promisc - don't discard packets that aren't to this LAN hardware address + multicast - force interface into multicast mode if the driver doesn't + allmulti - promisc for multicast packets + + Obsolete fields included for historical purposes: + irq|io_addr|mem_start ADDR - micromanage obsolete hardware + outfill|keepalive INTEGER - SLIP analog dialup line quality monitoring + metric INTEGER - added to Linux 0.9.10 with comment "never used", still true */ #define FOR_ifconfig @@ -62,13 +80,13 @@ void get_addrinfo(char *host, sa_family_t af, void *addr) if (rp->ai_family == af) break; if (!rp) error_exit("bad address '%s' : %s", host, gai_strerror(status)); - // You'd think ipv4 and ipv6 would ahve some basic compatability, but no. - len = 4; - from = ((char *)rp->ai_addr->sa_data) + 2; + // ai_addr isn't struct in_addr or in6_addr, it's struct sockaddr. Of course. + // You'd think ipv4 and ipv6 would have some basic compatibility, but no. + from = ((char *)rp->ai_addr) + 4; if (af == AF_INET6) { len = 16; - from += 4; - } + from += 4; // skip "flowinfo" field ipv6 puts before address + } else len = 4; memcpy(addr, from, len); freeaddrinfo(result); } @@ -344,11 +362,9 @@ void ifconfig_main(void) {"up", IFF_UP|IFF_RUNNING, 0}, {"down", 0, IFF_UP}, {"arp", 0, IFF_NOARP}, - {"trailers", 0, IFF_NOTRAILERS}, {"promisc", IFF_PROMISC, 0}, {"allmulti", IFF_ALLMULTI, 0}, {"multicast", IFF_MULTICAST, 0}, - {"dynamic", IFF_DYNAMIC, 0}, {"pointopoint", IFF_POINTOPOINT, SIOCSIFDSTADDR}, {"broadcast", IFF_BROADCAST, SIOCSIFBRDADDR}, {"netmask", 0, SIOCSIFNETMASK}, |