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