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ifconfig: Allow setting an adapter's IPv4 address

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You can now do things like "ifconfig e1k0 192.168.1.2" to set the
IPv4 address of e1k0. Pretty neat!
This commit is contained in:
Andreas Kling 2019-09-23 19:06:53 +02:00
parent 2482fc3538
commit 797e132d0c
1 changed files with 33 additions and 3 deletions
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36
Userland/ifconfig.cpp
View file

@ -1,9 +1,12 @@
#include <AK/String.h>
#include <AK/JsonArray.h> #include <AK/JsonArray.h>
#include <AK/JsonObject.h> #include <AK/JsonObject.h>
#include <AK/String.h>
#include <AK/Types.h> #include <AK/Types.h>
#include <LibCore/CFile.h> #include <LibCore/CFile.h>
#include <net/if.h>
#include <stdio.h> #include <stdio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
String si_bytes(unsigned bytes) String si_bytes(unsigned bytes)
{ {
@ -18,8 +21,35 @@ String si_bytes(unsigned bytes)
int main(int argc, char** argv) int main(int argc, char** argv)
{ {
UNUSED_PARAM(argc); if (argc == 3) {
UNUSED_PARAM(argv); String ifname = argv[1];
auto address = IPv4Address::from_string(argv[2]);
if (!address.has_value()) {
fprintf(stderr, "Invalid IPv4 address: '%s'\n", argv[2]);
return 1;
}
int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (fd < 0) {
perror("socket");
return 1;
}
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifname.characters(), IFNAMSIZ);
ifr.ifr_addr.sa_family = AF_INET;
((sockaddr_in&)ifr.ifr_addr).sin_addr.s_addr = address.value().to_in_addr_t();
int rc = ioctl(fd, SIOCSIFADDR, &ifr);
if (rc < 0) {
perror("ioctl(SIOCSIFADDR)");
return 1;
}
return 0;
}
auto file = CFile::construct("/proc/net/adapters"); auto file = CFile::construct("/proc/net/adapters");
if (!file->open(CIODevice::ReadOnly)) { if (!file->open(CIODevice::ReadOnly)) {