X-Git-Url: https://git.decadent.org.uk/gitweb/?p=odhcp6c.git;a=blobdiff_plain;f=src%2Fscript.c;h=1533510dbab56c8d8394298ecf48c844b9255380;hp=f62ea5ef319fe965f489fd4456e77547ada56626;hb=6326ab374ede4fff1e8019a50d4b9854b8db7625;hpb=285abfbe5dbad63c499252df829332b969d4b746 diff --git a/src/script.c b/src/script.c index f62ea5e..1533510 100644 --- a/src/script.c +++ b/src/script.c @@ -1,5 +1,5 @@ /** - * Copyright (C) 2012 Steven Barth + * Copyright (C) 2012-2014 Steven Barth * * 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 @@ -13,12 +13,16 @@ */ #include +#include #include #include #include #include +#include #include +#include #include +#include #include #include "odhcp6c.h" @@ -36,14 +40,27 @@ static const int8_t hexvals[] = { }; +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; } @@ -88,7 +105,9 @@ static void ipv6_to_env(const char *name, 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); } @@ -96,22 +115,25 @@ static void ipv6_to_env(const char *name, 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; @@ -128,82 +150,320 @@ static void bin_to_env(uint8_t *opts, size_t len) } } +enum entry_type { + ENTRY_ADDRESS, + ENTRY_HOST, + ENTRY_ROUTE, + ENTRY_PREFIX +}; -static void entry_to_env(const char *name, const void *data, size_t len, bool host, bool route) +static void entry_to_env(const char *name, const void *data, size_t len, enum entry_type type) { size_t buf_len = strlen(name); const struct odhcp6c_entry *e = data; - char *buf = realloc(NULL, buf_len + 2 + (len / sizeof(*e)) * 144); + // 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++] = '='; 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]); - if (!host) { - buf_len += snprintf(&buf[buf_len], 6, "/%hhu", e[i].length); - if (route) { + 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]); } - buf_len += snprintf(&buf[buf_len], 24, ",%u", e[i].valid); + snprintf(&buf[buf_len], 23, ",%u,%u", e[i].valid, e[i].priority); + buf += strlen(&buf[buf_len]); } else { - buf_len += snprintf(&buf[buf_len], 24, ",%u,%u", e[i].preferred, e[i].valid); + 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]); } - if (e[i].priority) - buf_len += snprintf(&buf[buf_len], 12, ",%u", e[i].priority); } buf[buf_len++] = ' '; } - buf[buf_len - 1] = '\0'; + 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++ = ' '; + } + + if (c[-1] == ' ') + c--; + *c = '\0'; putenv(buf); } -void script_call(const char *status) +static void int_to_env(const char *name, int value) { - 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, address_len, ra_pref_len, ra_route_len, ra_dns_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); - - // Don't set environment before forking, because env is leaky. - if (fork() == 0) { + 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) +{ + 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); - entry_to_env("PREFIXES", prefix, prefix_len, false, false); - entry_to_env("ADDRESSES", address, address_len, false, false); - entry_to_env("RA_ADDRESSES", ra_pref, ra_pref_len, false, false); - entry_to_env("RA_ROUTES", ra_route, ra_route_len, false, true); - entry_to_env("RA_DNS", ra_dns, ra_dns_len, true, false); - 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_CUSTOM_OPTS); }