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| -rw-r--r-- | klibc-utils/ipconfig.c.txt | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/klibc-utils/ipconfig.c.txt b/klibc-utils/ipconfig.c.txt new file mode 100644 index 0000000..5dd95c1 --- /dev/null +++ b/klibc-utils/ipconfig.c.txt @@ -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') |