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-rw-r--r--toys/other/ifconfig.c58
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},