/**
- * Copyright (C) 2012 Steven Barth <steven@midlink.org>
+ * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2 as published by
*/
#include <stdio.h>
+#include <netdb.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
+#include <signal.h>
#include <unistd.h>
+#include <inttypes.h>
#include <arpa/inet.h>
+#include <sys/wait.h>
#include <netinet/in.h>
#include "odhcp6c.h"
};
+static char action[16] = "";
+static char *argv[4] = {NULL, NULL, action, NULL};
+static volatile pid_t running = 0;
+static time_t started;
-static char *argv[4] = {NULL, NULL, NULL, NULL};
+static void script_sighandle(int signal)
+{
+ if (signal == SIGCHLD) {
+ pid_t child;
+ while ((child = waitpid(-1, NULL, WNOHANG)) > 0)
+ if (running == child)
+ running = 0;
+ }
+}
int script_init(const char *path, const char *ifname)
{
argv[0] = (char*)path;
argv[1] = (char*)ifname;
+ signal(SIGCHLD, script_sighandle);
return 0;
}
}
-void script_hexlify(char *dst, const uint8_t *src, size_t len) {
+static void script_hexlify(char *dst, const uint8_t *src, size_t len) {
for (size_t i = 0; i < len; ++i) {
*dst++ = hexdigits[src[i] >> 4];
*dst++ = hexdigits[src[i] & 0x0f];
buf_len += strlen(&buf[buf_len]);
buf[buf_len++] = ' ';
}
- buf[buf_len - 1] = '\0';
+ if (buf[buf_len - 1] == ' ')
+ buf_len--;
+ buf[buf_len] = '\0';
putenv(buf);
}
static void fqdn_to_env(const char *name, const uint8_t *fqdn, size_t len)
{
size_t buf_len = strlen(name);
+ size_t buf_size = len + buf_len + 2;
const uint8_t *fqdn_end = fqdn + len;
char *buf = realloc(NULL, len + buf_len + 2);
memcpy(buf, name, buf_len);
buf[buf_len++] = '=';
- int l = 1;
- while (l > 0 && fqdn < fqdn_end) {
- l = dn_expand(fqdn, &fqdn[len], fqdn, &buf[buf_len], len);
+ while (fqdn < fqdn_end) {
+ int l = dn_expand(fqdn, fqdn_end, fqdn, &buf[buf_len], buf_size - buf_len);
+ if (l <= 0)
+ break;
fqdn += l;
buf_len += strlen(&buf[buf_len]);
buf[buf_len++] = ' ';
}
- buf[buf_len - 1] = '\0';
+ if (buf[buf_len - 1] == ' ')
+ buf_len--;
+ buf[buf_len] = '\0';
putenv(buf);
}
-
static void bin_to_env(uint8_t *opts, size_t len)
{
uint8_t *oend = opts + len, *odata;
}
}
+enum entry_type {
+ ENTRY_ADDRESS,
+ ENTRY_HOST,
+ ENTRY_ROUTE,
+ ENTRY_PREFIX
+};
-static void prefix_to_env(const char *name, const uint8_t *fqdn, size_t len)
+static void entry_to_env(const char *name, const void *data, size_t len, enum entry_type type)
{
size_t buf_len = strlen(name);
- struct dhcpv6_ia_prefix *p = NULL;
- char *buf = realloc(NULL, buf_len + 2 +
- (len / sizeof(*p)) * (INET6_ADDRSTRLEN + 32));
+ const struct odhcp6c_entry *e = data;
+ // Worst case: ENTRY_PREFIX with iaid != 1 and exclusion
+ const size_t max_entry_len = (INET6_ADDRSTRLEN-1 + 5 + 22 + 15 + 10 +
+ INET6_ADDRSTRLEN-1 + 11 + 1);
+ char *buf = realloc(NULL, buf_len + 2 + (len / sizeof(*e)) * max_entry_len);
memcpy(buf, name, buf_len);
buf[buf_len++] = '=';
- uint16_t otype, olen;
- uint8_t *odata;
- dhcpv6_for_each_option(fqdn, &fqdn[len], otype, olen, odata) {
- if (otype != DHCPV6_OPT_IA_PREFIX || olen + 4U < sizeof(*p))
- continue;
-
- p = (struct dhcpv6_ia_prefix*)&odata[-4];
- inet_ntop(AF_INET6, &p->addr, &buf[buf_len], INET6_ADDRSTRLEN);
+ for (size_t i = 0; i < len / sizeof(*e); ++i) {
+ inet_ntop(AF_INET6, &e[i].target, &buf[buf_len], INET6_ADDRSTRLEN);
buf_len += strlen(&buf[buf_len]);
- buf_len += snprintf(&buf[buf_len], 32, "/%hhu,%u,%u ",
- p->prefix, ntohl(p->preferred),
- ntohl(p->valid));
+ if (type != ENTRY_HOST) {
+ snprintf(&buf[buf_len], 6, "/%"PRIu16, e[i].length);
+ buf += strlen(&buf[buf_len]);
+ if (type == ENTRY_ROUTE) {
+ buf[buf_len++] = ',';
+ if (!IN6_IS_ADDR_UNSPECIFIED(&e[i].router)) {
+ inet_ntop(AF_INET6, &e[i].router, &buf[buf_len], INET6_ADDRSTRLEN);
+ buf_len += strlen(&buf[buf_len]);
+ }
+ snprintf(&buf[buf_len], 23, ",%u,%u", e[i].valid, e[i].priority);
+ buf += strlen(&buf[buf_len]);
+ } else {
+ snprintf(&buf[buf_len], 23, ",%u,%u", e[i].preferred, e[i].valid);
+ buf += strlen(&buf[buf_len]);
+ }
+
+ if (type == ENTRY_PREFIX && ntohl(e[i].iaid) != 1) {
+ snprintf(&buf[buf_len], 16, ",class=%08x", ntohl(e[i].iaid));
+ buf += strlen(&buf[buf_len]);
+ }
+
+ if (type == ENTRY_PREFIX && e[i].priority) {
+ // priority and router are abused for prefix exclusion
+ snprintf(&buf[buf_len], 11, ",excluded=");
+ buf_len += strlen(&buf[buf_len]);
+ inet_ntop(AF_INET6, &e[i].router, &buf[buf_len], INET6_ADDRSTRLEN);
+ buf_len += strlen(&buf[buf_len]);
+ snprintf(&buf[buf_len], 12, "/%u", e[i].priority);
+ buf_len += strlen(&buf[buf_len]);
+ }
+ }
+ buf[buf_len++] = ' ';
+ }
+
+ if (buf[buf_len - 1] == ' ')
+ buf_len--;
+ buf[buf_len] = '\0';
+ putenv(buf);
+}
+
+
+static void search_to_env(const char *name, const uint8_t *start, size_t len)
+{
+ size_t buf_len = strlen(name);
+ char *buf = realloc(NULL, buf_len + 2 + len);
+ char *c = mempcpy(buf, name, buf_len);
+ *c++ = '=';
+
+ for (struct odhcp6c_entry *e = (struct odhcp6c_entry*)start;
+ (uint8_t*)e < &start[len] && &e->auxtarget[e->auxlen] <= &start[len];
+ e = (struct odhcp6c_entry*)(&e->auxtarget[e->auxlen])) {
+ c = mempcpy(c, e->auxtarget, e->auxlen);
+ *c++ = ' ';
}
- buf[buf_len - 1] = '\0';
+
+ if (c[-1] == ' ')
+ c--;
+ *c = '\0';
putenv(buf);
}
-void script_call(const char *status)
+static void int_to_env(const char *name, int value)
+{
+ size_t len = 13 + strlen(name);
+ char *buf = realloc(NULL, len);
+ snprintf(buf, len, "%s=%d", name, value);
+ putenv(buf);
+}
+
+
+static void s46_to_env_portparams(const uint8_t *data, size_t len, FILE *fp)
+{
+ uint8_t *odata;
+ uint16_t otype, olen;
+ dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
+ if (otype == DHCPV6_OPT_S46_PORTPARAMS &&
+ olen == sizeof(struct dhcpv6_s46_portparams)) {
+ struct dhcpv6_s46_portparams *params = (void*)odata;
+ fprintf(fp, "offset=%d,psidlen=%d,psid=%d,",
+ params->offset, params->psid_len, ntohs(params->psid));
+ }
+ }
+}
+
+
+static void s46_to_env(enum odhcp6c_state state, const uint8_t *data, size_t len)
+{
+ const char *name = (state == STATE_S46_MAPE) ? "MAPE" :
+ (state == STATE_S46_MAPT) ? "MAPT" : "LW4O6";
+
+ if (len == 0)
+ return;
+
+ char *str;
+ size_t strsize;
+
+ FILE *fp = open_memstream(&str, &strsize);
+ fputs(name, fp);
+ fputc('=', fp);
+
+ const char *type = (state == STATE_S46_MAPE) ? "map-e" :
+ (state == STATE_S46_MAPT) ? "map-t" : "lw4o6";
+
+ uint8_t *odata;
+ uint16_t otype, olen;
+ dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
+ struct dhcpv6_s46_rule *rule = (struct dhcpv6_s46_rule*)odata;
+ struct dhcpv6_s46_v4v6bind *bind = (struct dhcpv6_s46_v4v6bind*)odata;
+
+ if (state != STATE_S46_LW && otype == DHCPV6_OPT_S46_RULE &&
+ olen >= sizeof(struct dhcpv6_s46_rule)) {
+ char buf4[INET_ADDRSTRLEN];
+ char buf6[INET6_ADDRSTRLEN];
+ struct in6_addr in6 = IN6ADDR_ANY_INIT;
+
+ size_t prefix6len = rule->prefix6_len;
+ prefix6len = (prefix6len % 8 == 0) ? prefix6len / 8 : prefix6len / 8 + 1;
+
+ if (prefix6len > sizeof(in6) ||
+ olen < sizeof(struct dhcpv6_s46_rule) + prefix6len)
+ continue;
+
+ memcpy(&in6, rule->ipv6_prefix, prefix6len);
+
+ inet_ntop(AF_INET, &rule->ipv4_prefix, buf4, sizeof(buf4));
+ inet_ntop(AF_INET6, &in6, buf6, sizeof(buf6));
+
+ if (rule->flags & 1)
+ fputs("fmr,", fp);
+
+ fprintf(fp, "type=%s,ealen=%d,prefix4len=%d,prefix6len=%d,ipv4prefix=%s,ipv6prefix=%s,",
+ type, rule->ea_len, rule->prefix4_len, rule->prefix6_len, buf4, buf6);
+
+ s46_to_env_portparams(&rule->ipv6_prefix[prefix6len],
+ olen - sizeof(*rule) - prefix6len, fp);
+
+ dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
+ if (state != STATE_S46_MAPT && otype == DHCPV6_OPT_S46_BR &&
+ olen == sizeof(struct in6_addr)) {
+ inet_ntop(AF_INET6, odata, buf6, sizeof(buf6));
+ fprintf(fp, "br=%s,", buf6);
+ } else if (state == STATE_S46_MAPT && otype == DHCPV6_OPT_S46_DMR &&
+ olen >= sizeof(struct dhcpv6_s46_dmr)) {
+ struct dhcpv6_s46_dmr *dmr = (struct dhcpv6_s46_dmr*)odata;
+ memset(&in6, 0, sizeof(in6));
+ size_t prefix6len = dmr->dmr_prefix6_len;
+ prefix6len = (prefix6len % 8 == 0) ? prefix6len / 8 : prefix6len / 8 + 1;
+
+ if (prefix6len > sizeof(in6) ||
+ olen < sizeof(struct dhcpv6_s46_dmr) + prefix6len)
+ continue;
+
+ memcpy(&in6, dmr->dmr_ipv6_prefix, prefix6len);
+ inet_ntop(AF_INET6, &in6, buf6, sizeof(buf6));
+ fprintf(fp, "dmr=%s/%d,", buf6, dmr->dmr_prefix6_len);
+ }
+ }
+
+ fputc(' ', fp);
+ } else if (state == STATE_S46_LW && otype == DHCPV6_OPT_S46_V4V6BIND &&
+ olen >= sizeof(struct dhcpv6_s46_v4v6bind)) {
+ char buf4[INET_ADDRSTRLEN];
+ char buf6[INET6_ADDRSTRLEN];
+ struct in6_addr in6 = IN6ADDR_ANY_INIT;
+
+ size_t prefix6len = bind->bindprefix6_len;
+ prefix6len = (prefix6len % 8 == 0) ? prefix6len / 8 : prefix6len / 8 + 1;
+
+ if (prefix6len > sizeof(in6) ||
+ olen < sizeof(struct dhcpv6_s46_v4v6bind) + prefix6len)
+ continue;
+
+ memcpy(&in6, bind->bind_ipv6_prefix, prefix6len);
+
+ inet_ntop(AF_INET, &bind->ipv4_address, buf4, sizeof(buf4));
+ inet_ntop(AF_INET6, &in6, buf6, sizeof(buf6));
+
+ fprintf(fp, "type=%s,prefix4len=32,prefix6len=%d,ipv4prefix=%s,ipv6prefix=%s,",
+ type, bind->bindprefix6_len, buf4, buf6);
+
+ s46_to_env_portparams(&bind->bind_ipv6_prefix[prefix6len],
+ olen - sizeof(*bind) - prefix6len, fp);
+
+ dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
+ if (otype == DHCPV6_OPT_S46_BR && olen == sizeof(struct in6_addr)) {
+ inet_ntop(AF_INET6, odata, buf6, sizeof(buf6));
+ fprintf(fp, "br=%s,", buf6);
+ }
+ }
+
+ fputc(' ', fp);
+ }
+ }
+
+ fclose(fp);
+ putenv(str);
+}
+
+
+void script_call(const char *status, int delay, bool resume)
{
- syslog(LOG_WARNING, "State for %s changed to %s", argv[1], status);
- size_t dns_len, search_len, custom_len, sntp_ip_len, sntp_dns_len;
- size_t sip_ip_len, sip_fqdn_len;
-
- struct in6_addr *dns = odhcp6c_get_state(STATE_DNS, &dns_len);
- uint8_t *search = odhcp6c_get_state(STATE_SEARCH, &search_len);
- uint8_t *custom = odhcp6c_get_state(STATE_CUSTOM_OPTS, &custom_len);
- struct in6_addr *sntp = odhcp6c_get_state(STATE_SNTP_IP, &sntp_ip_len);
- uint8_t *sntp_dns = odhcp6c_get_state(STATE_SNTP_FQDN, &sntp_dns_len);
- struct in6_addr *sip = odhcp6c_get_state(STATE_SIP_IP, &sip_ip_len);
- uint8_t *sip_fqdn = odhcp6c_get_state(STATE_SIP_FQDN, &sip_fqdn_len);
-
- size_t prefix_len, lost_pd_len;
- uint8_t *prefix = odhcp6c_get_state(STATE_IA_PD, &prefix_len);
- uint8_t *lost_pd = odhcp6c_get_state(STATE_IA_PD_LOST, &lost_pd_len);
-
- // Don't set environment before forking, because env is leaky.
- if (fork() == 0) {
+ time_t now = odhcp6c_get_milli_time() / 1000;
+ bool running_script = false;
+
+ if (running) {
+ kill(running, SIGTERM);
+ delay -= now - started;
+ running_script = true;
+ }
+
+ if (resume || !running_script || !action[0])
+ strncpy(action, status, sizeof(action) - 1);
+
+ pid_t pid = fork();
+ if (pid > 0) {
+ running = pid;
+ started = now;
+
+ if (!resume)
+ action[0] = 0;
+ } else if (pid == 0) {
+ size_t dns_len, search_len, custom_len, sntp_ip_len, ntp_ip_len, ntp_dns_len;
+ size_t sip_ip_len, sip_fqdn_len, aftr_name_len, cer_len, addr_len;
+ size_t s46_mapt_len, s46_mape_len, s46_lw_len, passthru_len;
+
+ signal(SIGTERM, SIG_DFL);
+ if (delay > 0) {
+ sleep(delay);
+ odhcp6c_expire();
+ }
+
+ struct in6_addr *addr = odhcp6c_get_state(STATE_SERVER_ADDR, &addr_len);
+ struct in6_addr *dns = odhcp6c_get_state(STATE_DNS, &dns_len);
+ uint8_t *search = odhcp6c_get_state(STATE_SEARCH, &search_len);
+ uint8_t *custom = odhcp6c_get_state(STATE_CUSTOM_OPTS, &custom_len);
+ struct in6_addr *sntp = odhcp6c_get_state(STATE_SNTP_IP, &sntp_ip_len);
+ struct in6_addr *ntp = odhcp6c_get_state(STATE_NTP_IP, &ntp_ip_len);
+ uint8_t *ntp_dns = odhcp6c_get_state(STATE_NTP_FQDN, &ntp_dns_len);
+ struct in6_addr *sip = odhcp6c_get_state(STATE_SIP_IP, &sip_ip_len);
+ uint8_t *sip_fqdn = odhcp6c_get_state(STATE_SIP_FQDN, &sip_fqdn_len);
+ uint8_t *aftr_name = odhcp6c_get_state(STATE_AFTR_NAME, &aftr_name_len);
+ struct in6_addr *cer = odhcp6c_get_state(STATE_CER, &cer_len);
+ uint8_t *s46_mapt = odhcp6c_get_state(STATE_S46_MAPT, &s46_mapt_len);
+ uint8_t *s46_mape = odhcp6c_get_state(STATE_S46_MAPE, &s46_mape_len);
+ uint8_t *s46_lw = odhcp6c_get_state(STATE_S46_LW, &s46_lw_len);
+ uint8_t *passthru = odhcp6c_get_state(STATE_PASSTHRU, &passthru_len);
+
+ size_t prefix_len, address_len, ra_pref_len,
+ ra_route_len, ra_dns_len, ra_search_len;
+ uint8_t *prefix = odhcp6c_get_state(STATE_IA_PD, &prefix_len);
+ uint8_t *address = odhcp6c_get_state(STATE_IA_NA, &address_len);
+ uint8_t *ra_pref = odhcp6c_get_state(STATE_RA_PREFIX, &ra_pref_len);
+ uint8_t *ra_route = odhcp6c_get_state(STATE_RA_ROUTE, &ra_route_len);
+ uint8_t *ra_dns = odhcp6c_get_state(STATE_RA_DNS, &ra_dns_len);
+ uint8_t *ra_search = odhcp6c_get_state(STATE_RA_SEARCH, &ra_search_len);
+
+ ipv6_to_env("SERVER", addr, addr_len / sizeof(*addr));
ipv6_to_env("RDNSS", dns, dns_len / sizeof(*dns));
ipv6_to_env("SNTP_IP", sntp, sntp_ip_len / sizeof(*sntp));
+ ipv6_to_env("NTP_IP", ntp, ntp_ip_len / sizeof(*ntp));
+ fqdn_to_env("NTP_FQDN", ntp_dns, ntp_dns_len);
ipv6_to_env("SIP_IP", sip, sip_ip_len / sizeof(*sip));
fqdn_to_env("DOMAINS", search, search_len);
- fqdn_to_env("SNTP_FQDN", sntp_dns, sntp_dns_len);
fqdn_to_env("SIP_DOMAIN", sip_fqdn, sip_fqdn_len);
+ fqdn_to_env("AFTR", aftr_name, aftr_name_len);
+ ipv6_to_env("CER", cer, cer_len / sizeof(*cer));
+ s46_to_env(STATE_S46_MAPE, s46_mape, s46_mape_len);
+ s46_to_env(STATE_S46_MAPT, s46_mapt, s46_mapt_len);
+ s46_to_env(STATE_S46_LW, s46_lw, s46_lw_len);
bin_to_env(custom, custom_len);
- prefix_to_env("PREFIXES", prefix, prefix_len);
- prefix_to_env("PREFIXES_LOST", lost_pd, lost_pd_len);
- argv[2] = (char*)status;
+ if (odhcp6c_is_bound()) {
+ entry_to_env("PREFIXES", prefix, prefix_len, ENTRY_PREFIX);
+ entry_to_env("ADDRESSES", address, address_len, ENTRY_ADDRESS);
+ }
+
+ entry_to_env("RA_ADDRESSES", ra_pref, ra_pref_len, ENTRY_ADDRESS);
+ entry_to_env("RA_ROUTES", ra_route, ra_route_len, ENTRY_ROUTE);
+ entry_to_env("RA_DNS", ra_dns, ra_dns_len, ENTRY_HOST);
+ search_to_env("RA_DOMAINS", ra_search, ra_search_len);
+
+ int_to_env("RA_HOPLIMIT", ra_conf_hoplimit(0));
+ int_to_env("RA_MTU", ra_conf_mtu(0));
+ int_to_env("RA_REACHABLE", ra_conf_reachable(0));
+ int_to_env("RA_RETRANSMIT", ra_conf_retransmit(0));
+
+ char *buf = malloc(10 + passthru_len * 2);
+ strncpy(buf, "PASSTHRU=", 10);
+ script_hexlify(&buf[9], passthru, passthru_len);
+ putenv(buf);
+
execv(argv[0], argv);
_exit(128);
}
-
- // Delete lost prefixes and user opts
- odhcp6c_clear_state(STATE_IA_PD_LOST);
- odhcp6c_clear_state(STATE_CUSTOM_OPTS);
}
projects / odhcp6c.git / blobdiff