klibc-utils: add ipconfig.c work-in-progress
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
58bf902a94
commit
e39da802dd
316
klibc-utils/ipconfig.c.txt
Normal file
316
klibc-utils/ipconfig.c.txt
Normal file
@ -0,0 +1,316 @@
|
||||
/*
|
||||
* Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
|
||||
*
|
||||
* Licensed under GPLv2, see file LICENSE in this source tree.
|
||||
*/
|
||||
//config:config IPCONFIG
|
||||
//config: bool "ipconfig"
|
||||
//config: default y
|
||||
//config: help
|
||||
//config: (Auto)configure network.
|
||||
|
||||
//applet:IF_IPCONFIG(APPLET(ipconfig, BB_DIR_BIN, BB_SUID_DROP))
|
||||
|
||||
//kbuild:lib-$(CONFIG_IPCONFIG) += ipconfig.o
|
||||
|
||||
#include <net/if.h>
|
||||
#include "libbb.h"
|
||||
|
||||
struct globals {
|
||||
int fixed;
|
||||
const char *hostname;
|
||||
};
|
||||
#define G (*ptr_to_globals)
|
||||
#define INIT_G() do { \
|
||||
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
||||
} while (0)
|
||||
|
||||
struct dev {
|
||||
const char *name;
|
||||
uint8_t fixed;
|
||||
uint32_t ip_addr;
|
||||
uint32_t ip_netmask;
|
||||
uint32_t ip_server;
|
||||
uint32_t ip_router;
|
||||
};
|
||||
|
||||
static int
|
||||
parse_method(const char *method)
|
||||
{
|
||||
int fixed;
|
||||
|
||||
fixed = (method[0] != '\0');
|
||||
if (fixed) {
|
||||
/* if it's not "" */
|
||||
fixed = index_in_strings(
|
||||
/* 0 */ "on""\0"
|
||||
/* 1 */ "any""\0"
|
||||
/* 2 */ "both""\0"
|
||||
/* 3 */ "dhcp""\0"
|
||||
/* 4 */ "bootp""\0"
|
||||
/* 5 */ "rarp""\0"
|
||||
/* 6 */ "none""\0"
|
||||
/* 7 */ "static""\0"
|
||||
/* 8 */ "off""\0"
|
||||
, method
|
||||
);
|
||||
if (fixed > 0)
|
||||
fixed /= 6;
|
||||
}
|
||||
return fixed;
|
||||
}
|
||||
|
||||
static uint32_t
|
||||
parse_addr(const char *ip)
|
||||
{
|
||||
struct in_addr in;
|
||||
if (inet_aton(ip, &in) == 0)
|
||||
bb_error_msg_and_die("bad IP address '%s'", ip);
|
||||
return in.s_addr;
|
||||
}
|
||||
|
||||
static struct dev*
|
||||
find_device(llist_t *iface_list, const char *name)
|
||||
{
|
||||
while (iface_list) {
|
||||
struct dev *dev = (void*) iface_list->data;
|
||||
if (strcmp(dev->name, name) == 0)
|
||||
return dev;
|
||||
iface_list = iface_list->link;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void
|
||||
set_from_template(struct dev *dev, struct dev *template)
|
||||
{
|
||||
if (template->ip_addr != 0)
|
||||
dev->ip_addr = template->ip_addr;
|
||||
if (template->ip_netmask != 0)
|
||||
dev->ip_netmask = template->ip_netmask;
|
||||
if (template->ip_server != 0)
|
||||
dev->ip_server = template->ip_server;
|
||||
if (template->ip_router != 0)
|
||||
dev->ip_router = template->ip_router;
|
||||
dev->fixed = template->fixed;
|
||||
}
|
||||
|
||||
// "ip=PROTO" - also implies -o
|
||||
// "nfsaddrs=PROTO" - also implies -o
|
||||
// "<devname>"
|
||||
// "[ip=/nfsaddrs=]IP:SERVER_IP:ROUTER:NETMASK:HOSTNAME:IFACE:METHOD"
|
||||
// all optional. trailing empty :: can be skipped, only one : needs to be there
|
||||
// (to distinguish from other formats).
|
||||
// ":::::eth0" - dhcp on eth0
|
||||
// ":" - dhcp on all ifaces
|
||||
// "::1.2.3.4" - dhcp on all ifaces, gateway is 1.2.3.4 (fairly nonsensical)
|
||||
static void
|
||||
add_all_devices(llist_t **iface_list, struct dev *template);
|
||||
static struct dev*
|
||||
add_device(llist_t **iface_list, char *ip)
|
||||
{
|
||||
struct dev *dev;
|
||||
|
||||
dev = xzalloc(sizeof(*dev));
|
||||
dev->fixed = G.fixed;
|
||||
|
||||
if (strncmp("ip=", ip, 3) == 0
|
||||
|| strncmp("nfsaddrs=", ip, 9) == 0
|
||||
) {
|
||||
int fixed;
|
||||
|
||||
ip = strchr(ip, '=') + 1;
|
||||
fixed = parse_method(ip);
|
||||
if (fixed >= 0) {
|
||||
add_all_devices(iface_list, dev);
|
||||
free(dev);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
if (!strchr(ip, ':')) {
|
||||
dev->name = ip;
|
||||
} else {
|
||||
unsigned opt = 0;
|
||||
while (ip && *ip) {
|
||||
char *next = strchr(ip, ':');
|
||||
if (next)
|
||||
*next++ = '\0';
|
||||
if (opt > 6)
|
||||
bb_error_msg_and_die("too many options for %s", dev->name);
|
||||
if (ip[0]) switch (opt) {
|
||||
case 0:
|
||||
dev->ip_addr = parse_addr(ip);
|
||||
break;
|
||||
case 1:
|
||||
dev->ip_server = parse_addr(ip);
|
||||
break;
|
||||
case 2:
|
||||
dev->ip_router = parse_addr(ip);
|
||||
break;
|
||||
case 3:
|
||||
dev->ip_netmask = parse_addr(ip);
|
||||
break;
|
||||
case 4:
|
||||
if (G.hostname && strcmp(G.hostname, ip) != 0)
|
||||
bb_error_msg_and_die("hostname must be the same");
|
||||
G.hostname = ip;
|
||||
break;
|
||||
case 5:
|
||||
dev->name = ip;
|
||||
break;
|
||||
case 6:
|
||||
dev->fixed = parse_method(ip);
|
||||
break;
|
||||
}
|
||||
ip = next;
|
||||
opt++;
|
||||
}
|
||||
}
|
||||
|
||||
if (dev->name == NULL
|
||||
|| strcmp(dev->name, "all") == 0
|
||||
) {
|
||||
add_all_devices(iface_list, dev);
|
||||
free(dev);
|
||||
return NULL;
|
||||
}
|
||||
llist_add_to_end(iface_list, dev);
|
||||
return dev;
|
||||
}
|
||||
|
||||
static void
|
||||
add_all_devices(llist_t **iface_list, struct dev *template)
|
||||
{
|
||||
DIR *d;
|
||||
struct dirent *de;
|
||||
#define sys_class_net "/sys/class/net"
|
||||
|
||||
/* All forms of "config all ifaces" imply -o */
|
||||
option_mask32 |= 1;
|
||||
|
||||
d = opendir(sys_class_net);
|
||||
if (!d)
|
||||
return;
|
||||
|
||||
while ((de = readdir(d)) != NULL) {
|
||||
struct dev *dev;
|
||||
char *filename;
|
||||
char p[sizeof(long)*3];
|
||||
unsigned long flags;
|
||||
int r;
|
||||
|
||||
/* Exclude devices beginning with dots as well as . and .. */
|
||||
if (de->d_name[0] == '.')
|
||||
continue;
|
||||
filename = xasprintf("%s/%s/flags", sys_class_net, de->d_name);
|
||||
r = open_read_close(filename, p, sizeof(p) - 1);
|
||||
free(filename);
|
||||
if (r < 0)
|
||||
continue;
|
||||
p[r] = '\0';
|
||||
/* file's format is "0xNNNN\n" */
|
||||
flags = bb_strtoul(p, NULL, 0);
|
||||
/*
|
||||
* Heuristic for if this is a reasonable boot interface.
|
||||
* This is the same logic the in-kernel ipconfig uses.
|
||||
*/
|
||||
if (flags & IFF_LOOPBACK)
|
||||
continue;
|
||||
if (!(flags & (IFF_BROADCAST | IFF_POINTOPOINT)))
|
||||
continue;
|
||||
if (find_device(*iface_list, de->d_name))
|
||||
continue;
|
||||
dev = add_device(iface_list, xstrdup(de->d_name));
|
||||
if (dev)
|
||||
set_from_template(dev, template);
|
||||
}
|
||||
closedir(d);
|
||||
#undef sys_class_net
|
||||
}
|
||||
|
||||
//usage:#define ipconfig_trivial_usage
|
||||
//usage: "[-c METHOD] [-t TIMEOUT] [-on] [-i VENDOR_ID] [-p PORT] [-d] IFACE..."
|
||||
//usage:#define ipconfig_full_usage "\n\n"
|
||||
//usage: "(Auto)configure network"
|
||||
//usage: "\n"
|
||||
//usage: "\n"" -c METHOD off/none/static or on/dhcp (default)"
|
||||
//usage: "\n"" -t SECONDS Give up after SECONDS"
|
||||
//usage: "\n"" -o Stop after one interface is configured"
|
||||
//usage: "\n"" -n Dry run"
|
||||
//usage: "\n"" -i VENDOR_ID DHCP vendor id (default '')"
|
||||
//usage: "\n"" -p PORT DHCP port to use"
|
||||
//usage: "\n"" [-d] IFACE... Interface(s)"
|
||||
//usage: "\n"
|
||||
//usage: "\n"" IFACE can be:"
|
||||
//usage: "\n"" all - configure all interfaces"
|
||||
//usage: "\n"" IFACE - configure this interface"
|
||||
//usage: "\n"" IP:SERVER_IP:ROUTER:NETMASK:HOSTNAME:IFACE:METHOD (all optional)"
|
||||
// TIMEOUT defaults to infinite
|
||||
// -d actually is an option with an argument
|
||||
// (not a clue why klibc-utils has two ways to specify interfaces)
|
||||
int ipconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||||
int ipconfig_main(int argc UNUSED_PARAM, char **argv)
|
||||
{
|
||||
const char *method = "";
|
||||
const char *vendor_id = "";
|
||||
llist_t *devname_list = NULL;
|
||||
llist_t *iface_list;
|
||||
int timeout = -1;
|
||||
unsigned port;
|
||||
unsigned opt;
|
||||
|
||||
INIT_G();
|
||||
|
||||
opt = getopt32(argv,
|
||||
"onc:t:i:p:+d:*",
|
||||
&method, &timeout, &vendor_id, &port, &devname_list
|
||||
);
|
||||
argv += optind;
|
||||
|
||||
G.fixed = parse_method(method);
|
||||
if (G.fixed < 0)
|
||||
bb_show_usage();
|
||||
|
||||
iface_list = NULL;
|
||||
while (devname_list)
|
||||
add_device(&iface_list, (char*) llist_pop(&devname_list));
|
||||
while (*argv)
|
||||
add_device(&iface_list, *argv++);
|
||||
|
||||
while (iface_list) {
|
||||
struct dev *dev = (void*) iface_list->data;
|
||||
printf("name:'%s'\n", dev->name);
|
||||
printf("fixed:%u\n" , dev->fixed);
|
||||
printf("ip:%s/" , inet_ntoa(*(struct in_addr*)&dev->ip_addr));
|
||||
printf("%s\n" , inet_ntoa(*(struct in_addr*)&dev->ip_netmask));
|
||||
printf("server:%s\n", inet_ntoa(*(struct in_addr*)&dev->ip_server));
|
||||
printf("router:%s\n", inet_ntoa(*(struct in_addr*)&dev->ip_router));
|
||||
iface_list = iface_list->link;
|
||||
}
|
||||
bb_error_msg("hostname:'%s'", G.hostname);
|
||||
bb_error_msg("fixed:%u", G.fixed);
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
//After device is configured, write out a "/run/net-IFACE.conf" file:
|
||||
// // udchcp env values:
|
||||
//write_option("DEVICE", dev->name); interface=eth0
|
||||
//write_option("PROTO", method);
|
||||
//write_option("IPV4ADDR", dev->ip_addr); ip=10.43.17.38
|
||||
//write_option("IPV4BROADCAST", dev->ip_broadcast); subnet=255.255.255.0 mask=24
|
||||
//write_option("IPV4NETMASK", dev->ip_netmask); subnet=255.255.255.0 mask=24
|
||||
//write_option("IPV4GATEWAY", dev->ip_gateway); router=10.43.17.254
|
||||
//write_option("IPV4DNS0", dev->ip_nameserver[0]); dns=10.38.5.26 10.11.5.19
|
||||
//write_option("IPV4DNS1", dev->ip_nameserver[1]); dns=10.38.5.26 10.11.5.19
|
||||
//write_option("HOSTNAME", dev->hostname); hostname="STR"
|
||||
//write_option("DNSDOMAIN", dev->dnsdomainname); domain=domain.com
|
||||
//write_option("NISDOMAIN", dev->nisdomainname); nisdomain="STR"
|
||||
//write_option("ROOTSERVER", my_inet_ntoa(dev->ip_server)); serverid=10.44.6.2
|
||||
//write_option("ROOTPATH", dev->bootpath); rootpath="STR"
|
||||
//write_option("filename", dev->filename); boot_file=/pxelinux.0
|
||||
//write_option("UPTIME", dev->uptime); sysinfo()->uptime
|
||||
//write_option("DHCPLEASETIME", dev->dhcpleasetime); lease=44148
|
||||
//write_option("DOMAINSEARCH", dev->domainsearch); search="ABC DEF"
|
||||
//
|
||||
//(write_option writes out single-quote escaped string, VAR='VAL')
|
||||
Loading…
Reference in New Issue
Block a user