--- /dev/null
+/*
+ * 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')
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