diff options
| -rw-r--r-- | package/utils/busybox/Config-defaults.in | 3 | ||||
| -rw-r--r-- | package/utils/busybox/config/networking/Config.in | 15 | ||||
| -rw-r--r-- | package/utils/busybox/patches/230-add_nslookup_lede.patch | 914 |
3 files changed, 931 insertions, 1 deletions
diff --git a/package/utils/busybox/Config-defaults.in b/package/utils/busybox/Config-defaults.in index 7f2c33a2e9..29cc475e4b 100644 --- a/package/utils/busybox/Config-defaults.in +++ b/package/utils/busybox/Config-defaults.in @@ -2271,6 +2271,9 @@ config BUSYBOX_DEFAULT_FEATURE_NETSTAT_PRG default y config BUSYBOX_DEFAULT_NSLOOKUP bool + default n +config BUSYBOX_DEFAULT_NSLOOKUP_LEDE + bool default y config BUSYBOX_DEFAULT_NTPD bool diff --git a/package/utils/busybox/config/networking/Config.in b/package/utils/busybox/config/networking/Config.in index bc2f127c4d..4ae8779dc6 100644 --- a/package/utils/busybox/config/networking/Config.in +++ b/package/utils/busybox/config/networking/Config.in @@ -704,6 +704,19 @@ config BUSYBOX_CONFIG_NSLOOKUP default BUSYBOX_DEFAULT_NSLOOKUP help nslookup is a tool to query Internet name servers. +config BUSYBOX_CONFIG_NSLOOKUP_LEDE + bool "nslookup_lede" + depends on !BUSYBOX_CONFIG_NSLOOKUP + default BUSYBOX_DEFAULT_NSLOOKUP_LEDE + help + nslookup is a tool to query Internet name servers (LEDE flavor). + +config BUSYBOX_CONFIG_FEATURE_NSLOOKUP_LEDE_LONG_OPTIONS + bool "Enable long options" + default BUSYBOX_DEFAULT_FEATURE_NSLOOKUP_LEDE_LONG_OPTIONS + depends on BUSYBOX_CONFIG_NSLOOKUP_LEDE && BUSYBOX_CONFIG_LONG_OPTS + help + Support long options for the nslookup applet. config BUSYBOX_CONFIG_NTPD bool "ntpd" default BUSYBOX_DEFAULT_NTPD @@ -1091,7 +1104,7 @@ source udhcp/Config.in config BUSYBOX_CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS string "ifup udhcpc command line options" default BUSYBOX_DEFAULT_IFUPDOWN_UDHCPC_CMD_OPTIONS - depends on BUSYBOX_CONFIG_IFUPDOWN && BUSYBOX_CONFIG_UDHCPC + depends on BUSYBOX_CONFIG_IFUP || BUSYBOX_CONFIG_IFDOWN help Command line options to pass to udhcpc from ifup. Intended to alter options not available in /etc/network/interfaces. diff --git a/package/utils/busybox/patches/230-add_nslookup_lede.patch b/package/utils/busybox/patches/230-add_nslookup_lede.patch new file mode 100644 index 0000000000..bff88a69cc --- /dev/null +++ b/package/utils/busybox/patches/230-add_nslookup_lede.patch @@ -0,0 +1,914 @@ +From 8c1440a0934dd8b3ad6aae48d6653b5ba6fce8a1 Mon Sep 17 00:00:00 2001 +From: Jo-Philipp Wich <jo@mein.io> +Date: Tue, 14 Mar 2017 22:21:34 +0100 +Subject: [PATCH] networking: add LEDE nslookup applet + +Add a new LEDE nslookup applet which is compatible with musl libc +and providing more features like ability to specify query type. + +In contrast to busybox' builtin nslookup applet, this variant does +not rely on libc resolver internals but uses explicit send logic +and the libresolv primitives to parse received DNS responses. + +Signed-off-by: Jo-Philipp Wich <jo@mein.io> +--- + Makefile.flags | 6 + + networking/nslookup_lede.c | 869 +++++++++++++++++++++++++++++++++++++++++++++ + 2 files changed, 875 insertions(+) + create mode 100644 networking/nslookup_lede.c + +diff --git a/Makefile.flags b/Makefile.flags +index 65021de..096ab77 100644 +--- a/Makefile.flags ++++ b/Makefile.flags +@@ -134,6 +134,12 @@ else + LDLIBS += m + endif + ++# nslookup_lede might need the resolv library ++RESOLV_AVAILABLE := $(shell echo 'int main(void){res_init();return 0;}' >resolvtest.c; $(CC) $(CFLAGS) -include resolv.h -lresolv -o /dev/null resolvtest.c >/dev/null 2>&1 && echo "y"; rm resolvtest.c) ++ifeq ($(RESOLV_AVAILABLE),y) ++LDLIBS += resolv ++endif ++ + # libpam may use libpthread, libdl and/or libaudit. + # On some platforms that requires an explicit -lpthread, -ldl, -laudit. + # However, on *other platforms* it fails when some of those flags +diff --git a/networking/nslookup_lede.c b/networking/nslookup_lede.c +new file mode 100644 +index 0000000..fe927ad +--- /dev/null ++++ b/networking/nslookup_lede.c +@@ -0,0 +1,869 @@ ++/* ++ * nslookup_lede - musl compatible replacement for busybox nslookup ++ * ++ * Copyright (C) 2017 Jo-Philipp Wich <jo@mein.io> ++ * ++ * Permission to use, copy, modify, and/or distribute this software for any ++ * purpose with or without fee is hereby granted, provided that the above ++ * copyright notice and this permission notice appear in all copies. ++ * ++ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES ++ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF ++ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ++ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES ++ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ++ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF ++ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ++ */ ++ ++//config:config NSLOOKUP_LEDE ++//config: bool "nslookup_lede" ++//config: depends on !NSLOOKUP ++//config: default y ++//config: help ++//config: nslookup is a tool to query Internet name servers (LEDE flavor). ++//config: ++//config:config FEATURE_NSLOOKUP_LEDE_LONG_OPTIONS ++//config: bool "Enable long options" ++//config: default y ++//config: depends on NSLOOKUP_LEDE && LONG_OPTS ++//config: help ++//config: Support long options for the nslookup applet. ++ ++//applet:IF_NSLOOKUP_LEDE(APPLET(nslookup, BB_DIR_USR_BIN, BB_SUID_DROP)) ++ ++//kbuild:lib-$(CONFIG_NSLOOKUP_LEDE) += nslookup_lede.o ++ ++//usage:#define nslookup_lede_trivial_usage ++//usage: "[HOST] [SERVER]" ++//usage:#define nslookup_lede_full_usage "\n\n" ++//usage: "Query the nameserver for the IP address of the given HOST\n" ++//usage: "optionally using a specified DNS server" ++//usage: ++//usage:#define nslookup_lede_example_usage ++//usage: "$ nslookup localhost\n" ++//usage: "Server: default\n" ++//usage: "Address: default\n" ++//usage: "\n" ++//usage: "Name: debian\n" ++//usage: "Address: 127.0.0.1\n" ++ ++#include <stdio.h> ++#include <resolv.h> ++#include <string.h> ++#include <errno.h> ++#include <time.h> ++#include <poll.h> ++#include <unistd.h> ++#include <stdlib.h> ++#include <sys/socket.h> ++#include <arpa/inet.h> ++#include <net/if.h> ++#include <netdb.h> ++ ++#include "libbb.h" ++ ++struct ns { ++ const char *name; ++ len_and_sockaddr addr; ++ int failures; ++ int replies; ++}; ++ ++struct query { ++ const char *name; ++ size_t qlen, rlen; ++ unsigned char query[512], reply[512]; ++ unsigned long latency; ++ int rcode, n_ns; ++}; ++ ++static struct { ++ int type; ++ const char *name; ++} qtypes[] = { ++ { ns_t_soa, "SOA" }, ++ { ns_t_ns, "NS" }, ++ { ns_t_a, "A" }, ++ { ns_t_aaaa, "AAAA" }, ++ { ns_t_cname, "CNAME" }, ++ { ns_t_mx, "MX" }, ++ { ns_t_txt, "TXT" }, ++ { ns_t_ptr, "PTR" }, ++ { ns_t_any, "ANY" }, ++ { } ++}; ++ ++static const char *rcodes[] = { ++ "NOERROR", ++ "FORMERR", ++ "SERVFAIL", ++ "NXDOMAIN", ++ "NOTIMP", ++ "REFUSED", ++ "YXDOMAIN", ++ "YXRRSET", ++ "NXRRSET", ++ "NOTAUTH", ++ "NOTZONE", ++ "RESERVED11", ++ "RESERVED12", ++ "RESERVED13", ++ "RESERVED14", ++ "RESERVED15", ++ "BADVERS" ++}; ++ ++static unsigned int default_port = 53; ++static unsigned int default_retry = 2; ++static unsigned int default_timeout = 5; ++ ++ ++static int parse_reply(const unsigned char *msg, size_t len) ++{ ++ ns_msg handle; ++ ns_rr rr; ++ int i, n, rdlen; ++ const char *format = NULL; ++ char astr[INET6_ADDRSTRLEN], dname[MAXDNAME]; ++ const unsigned char *cp; ++ ++ if (ns_initparse(msg, len, &handle) != 0) { ++ //fprintf(stderr, "Unable to parse reply: %s\n", strerror(errno)); ++ return -1; ++ } ++ ++ for (i = 0; i < ns_msg_count(handle, ns_s_an); i++) { ++ if (ns_parserr(&handle, ns_s_an, i, &rr) != 0) { ++ //fprintf(stderr, "Unable to parse resource record: %s\n", strerror(errno)); ++ return -1; ++ } ++ ++ rdlen = ns_rr_rdlen(rr); ++ ++ switch (ns_rr_type(rr)) ++ { ++ case ns_t_a: ++ if (rdlen != 4) { ++ //fprintf(stderr, "Unexpected A record length\n"); ++ return -1; ++ } ++ inet_ntop(AF_INET, ns_rr_rdata(rr), astr, sizeof(astr)); ++ printf("Name:\t%s\nAddress: %s\n", ns_rr_name(rr), astr); ++ break; ++ ++ case ns_t_aaaa: ++ if (rdlen != 16) { ++ //fprintf(stderr, "Unexpected AAAA record length\n"); ++ return -1; ++ } ++ inet_ntop(AF_INET6, ns_rr_rdata(rr), astr, sizeof(astr)); ++ printf("%s\thas AAAA address %s\n", ns_rr_name(rr), astr); ++ break; ++ ++ case ns_t_ns: ++ if (!format) ++ format = "%s\tnameserver = %s\n"; ++ /* fall through */ ++ ++ case ns_t_cname: ++ if (!format) ++ format = "%s\tcanonical name = %s\n"; ++ /* fall through */ ++ ++ case ns_t_ptr: ++ if (!format) ++ format = "%s\tname = %s\n"; ++ if (ns_name_uncompress(ns_msg_base(handle), ns_msg_end(handle), ++ ns_rr_rdata(rr), dname, sizeof(dname)) < 0) { ++ //fprintf(stderr, "Unable to uncompress domain: %s\n", strerror(errno)); ++ return -1; ++ } ++ printf(format, ns_rr_name(rr), dname); ++ break; ++ ++ case ns_t_mx: ++ if (rdlen < 2) { ++ fprintf(stderr, "MX record too short\n"); ++ return -1; ++ } ++ n = ns_get16(ns_rr_rdata(rr)); ++ if (ns_name_uncompress(ns_msg_base(handle), ns_msg_end(handle), ++ ns_rr_rdata(rr) + 2, dname, sizeof(dname)) < 0) { ++ //fprintf(stderr, "Cannot uncompress MX domain: %s\n", strerror(errno)); ++ return -1; ++ } ++ printf("%s\tmail exchanger = %d %s\n", ns_rr_name(rr), n, dname); ++ break; ++ ++ case ns_t_txt: ++ if (rdlen < 1) { ++ //fprintf(stderr, "TXT record too short\n"); ++ return -1; ++ } ++ n = *(unsigned char *)ns_rr_rdata(rr); ++ if (n > 0) { ++ memset(dname, 0, sizeof(dname)); ++ memcpy(dname, ns_rr_rdata(rr) + 1, n); ++ printf("%s\ttext = \"%s\"\n", ns_rr_name(rr), dname); ++ } ++ break; ++ ++ case ns_t_soa: ++ if (rdlen < 20) { ++ //fprintf(stderr, "SOA record too short\n"); ++ return -1; ++ } ++ ++ printf("%s\n", ns_rr_name(rr)); ++ ++ cp = ns_rr_rdata(rr); ++ n = ns_name_uncompress(ns_msg_base(handle), ns_msg_end(handle), ++ cp, dname, sizeof(dname)); ++ ++ if (n < 0) { ++ //fprintf(stderr, "Unable to uncompress domain: %s\n", strerror(errno)); ++ return -1; ++ } ++ ++ printf("\torigin = %s\n", dname); ++ cp += n; ++ ++ n = ns_name_uncompress(ns_msg_base(handle), ns_msg_end(handle), ++ cp, dname, sizeof(dname)); ++ ++ if (n < 0) { ++ //fprintf(stderr, "Unable to uncompress domain: %s\n", strerror(errno)); ++ return -1; ++ } ++ ++ printf("\tmail addr = %s\n", dname); ++ cp += n; ++ ++ printf("\tserial = %lu\n", ns_get32(cp)); ++ cp += 4; ++ ++ printf("\trefresh = %lu\n", ns_get32(cp)); ++ cp += 4; ++ ++ printf("\tretry = %lu\n", ns_get32(cp)); ++ cp += 4; ++ ++ printf("\texpire = %lu\n", ns_get32(cp)); ++ cp += 4; ++ ++ printf("\tminimum = %lu\n", ns_get32(cp)); ++ break; ++ ++ default: ++ break; ++ } ++ } ++ ++ return i; ++} ++ ++static int parse_nsaddr(const char *addrstr, len_and_sockaddr *lsa) ++{ ++ char *eptr, *hash, ifname[IFNAMSIZ]; ++ unsigned int port = default_port; ++ unsigned int scope = 0; ++ ++ hash = strchr(addrstr, '#'); ++ ++ if (hash) { ++ *hash++ = '\0'; ++ port = strtoul(hash, &eptr, 10); ++ ++ if (eptr == hash || *eptr != '\0' || port > 65535) { ++ errno = EINVAL; ++ return -1; ++ } ++ } ++ ++ hash = strchr(addrstr, '%'); ++ ++ if (hash) { ++ for (eptr = ++hash; *eptr != '\0' && *eptr != '#'; eptr++) { ++ if ((eptr - hash) >= IFNAMSIZ) { ++ errno = ENODEV; ++ return -1; ++ } ++ ++ ifname[eptr - hash] = *eptr; ++ } ++ ++ ifname[eptr - hash] = '\0'; ++ scope = if_nametoindex(ifname); ++ ++ if (scope == 0) { ++ errno = ENODEV; ++ return -1; ++ } ++ } ++ ++ if (inet_pton(AF_INET6, addrstr, &lsa->u.sin6.sin6_addr)) { ++ lsa->u.sin6.sin6_family = AF_INET6; ++ lsa->u.sin6.sin6_port = htons(port); ++ lsa->u.sin6.sin6_scope_id = scope; ++ lsa->len = sizeof(lsa->u.sin6); ++ return 0; ++ } ++ ++ if (!scope && inet_pton(AF_INET, addrstr, &lsa->u.sin.sin_addr)) { ++ lsa->u.sin.sin_family = AF_INET; ++ lsa->u.sin.sin_port = htons(port); ++ lsa->len = sizeof(lsa->u.sin); ++ return 0; ++ } ++ ++ errno = EINVAL; ++ return -1; ++} ++ ++static char *make_ptr(const char *addrstr) ++{ ++ const char *hexdigit = "0123456789abcdef"; ++ static char ptrstr[73]; ++ unsigned char addr[16]; ++ char *ptr = ptrstr; ++ int i; ++ ++ if (inet_pton(AF_INET6, addrstr, addr)) { ++ if (memcmp(addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12) != 0) { ++ for (i = 0; i < 16; i++) { ++ *ptr++ = hexdigit[(unsigned char)addr[15 - i] & 0xf]; ++ *ptr++ = '.'; ++ *ptr++ = hexdigit[(unsigned char)addr[15 - i] >> 4]; ++ *ptr++ = '.'; ++ } ++ strcpy(ptr, "ip6.arpa"); ++ } ++ else { ++ sprintf(ptr, "%u.%u.%u.%u.in-addr.arpa", ++ addr[15], addr[14], addr[13], addr[12]); ++ } ++ ++ return ptrstr; ++ } ++ ++ if (inet_pton(AF_INET, addrstr, addr)) { ++ sprintf(ptr, "%u.%u.%u.%u.in-addr.arpa", ++ addr[3], addr[2], addr[1], addr[0]); ++ return ptrstr; ++ } ++ ++ return NULL; ++} ++ ++static unsigned long mtime(void) ++{ ++ struct timespec ts; ++ clock_gettime(CLOCK_REALTIME, &ts); ++ return (unsigned long)ts.tv_sec * 1000 + ts.tv_nsec / 1000000; ++} ++ ++static void to_v4_mapped(len_and_sockaddr *a) ++{ ++ if (a->u.sa.sa_family != AF_INET) ++ return; ++ ++ memcpy(a->u.sin6.sin6_addr.s6_addr + 12, ++ &a->u.sin.sin_addr, 4); ++ ++ memcpy(a->u.sin6.sin6_addr.s6_addr, ++ "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12); ++ ++ a->u.sin6.sin6_family = AF_INET6; ++ a->u.sin6.sin6_flowinfo = 0; ++ a->u.sin6.sin6_scope_id = 0; ++ a->len = sizeof(a->u.sin6); ++} ++ ++ ++/* ++ * Function logic borrowed & modified from musl libc, res_msend.c ++ */ ++ ++static int send_queries(struct ns *ns, int n_ns, struct query *queries, int n_queries) ++{ ++ int fd; ++ int timeout = default_timeout * 1000, retry_interval, servfail_retry = 0; ++ len_and_sockaddr from = { }; ++ int one = 1; ++ int recvlen = 0; ++ int n_replies = 0; ++ struct pollfd pfd; ++ unsigned long t0, t1, t2; ++ int nn, qn, next_query = 0; ++ ++ from.u.sa.sa_family = AF_INET; ++ from.len = sizeof(from.u.sin); ++ ++ for (nn = 0; nn < n_ns; nn++) { ++ if (ns[nn].addr.u.sa.sa_family == AF_INET6) { ++ from.u.sa.sa_family = AF_INET6; ++ from.len = sizeof(from.u.sin6); ++ break; ++ } ++ } ++ ++ /* Get local address and open/bind a socket */ ++ fd = socket(from.u.sa.sa_family, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); ++ ++ /* Handle case where system lacks IPv6 support */ ++ if (fd < 0 && from.u.sa.sa_family == AF_INET6 && errno == EAFNOSUPPORT) { ++ fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); ++ from.u.sa.sa_family = AF_INET; ++ } ++ ++ if (fd < 0) ++ return -1; ++ ++ if (bind(fd, &from.u.sa, from.len) < 0) { ++ close(fd); ++ return -1; ++ } ++ ++ /* Convert any IPv4 addresses in a mixed environment to v4-mapped */ ++ if (from.u.sa.sa_family == AF_INET6) { ++ setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)); ++ ++ for (nn = 0; nn < n_ns; nn++) ++ to_v4_mapped(&ns[nn].addr); ++ } ++ ++ pfd.fd = fd; ++ pfd.events = POLLIN; ++ retry_interval = timeout / default_retry; ++ t0 = t2 = mtime(); ++ t1 = t2 - retry_interval; ++ ++ for (; t2 - t0 < timeout; t2 = mtime()) { ++ if (t2 - t1 >= retry_interval) { ++ for (qn = 0; qn < n_queries; qn++) { ++ if (queries[qn].rlen) ++ continue; ++ ++ for (nn = 0; nn < n_ns; nn++) { ++ sendto(fd, queries[qn].query, queries[qn].qlen, ++ MSG_NOSIGNAL, &ns[nn].addr.u.sa, ns[nn].addr.len); ++ } ++ } ++ ++ t1 = t2; ++ servfail_retry = 2 * n_queries; ++ } ++ ++ /* Wait for a response, or until time to retry */ ++ if (poll(&pfd, 1, t1+retry_interval-t2) <= 0) ++ continue; ++ ++ while (1) { ++ recvlen = recvfrom(fd, queries[next_query].reply, ++ sizeof(queries[next_query].reply), 0, ++ &from.u.sa, &from.len); ++ ++ /* read error */ ++ if (recvlen < 0) ++ break; ++ ++ /* Ignore non-identifiable packets */ ++ if (recvlen < 4) ++ continue; ++ ++ /* Ignore replies from addresses we didn't send to */ ++ for (nn = 0; nn < n_ns; nn++) ++ if (memcmp(&from.u.sa, &ns[nn].addr.u.sa, from.len) == 0) ++ break; ++ ++ if (nn >= n_ns) ++ continue; ++ ++ /* Find which query this answer goes with, if any */ ++ for (qn = next_query; qn < n_queries; qn++) ++ if (!memcmp(queries[next_query].reply, queries[qn].query, 2)) ++ break; ++ ++ if (qn >= n_queries || queries[qn].rlen) ++ continue; ++ ++ queries[qn].rcode = queries[next_query].reply[3] & 15; ++ queries[qn].latency = mtime() - t0; ++ queries[qn].n_ns = nn; ++ ++ ns[nn].replies++; ++ ++ /* Only accept positive or negative responses; ++ * retry immediately on server failure, and ignore ++ * all other codes such as refusal. */ ++ switch (queries[qn].rcode) { ++ case 0: ++ case 3: ++ break; ++ ++ case 2: ++ if (servfail_retry && servfail_retry--) { ++ ns[nn].failures++; ++ sendto(fd, queries[qn].query, queries[qn].qlen, ++ MSG_NOSIGNAL, &ns[nn].addr.u.sa, ns[nn].addr.len); ++ } ++ /* fall through */ ++ ++ default: ++ continue; ++ } ++ ++ /* Store answer */ ++ n_replies++; ++ ++ queries[qn].rlen = recvlen; ++ ++ if (qn == next_query) { ++ while (next_query < n_queries) { ++ if (!queries[next_query].rlen) ++ break; ++ ++ next_query++; ++ } ++ } ++ else { ++ memcpy(queries[qn].reply, queries[next_query].reply, recvlen); ++ } ++ ++ if (next_query >= n_queries) ++ return n_replies; ++ } ++ } ++ ++ return n_replies; ++} ++ ++static struct ns *add_ns(struct ns **ns, int *n_ns, const char *addr) ++{ ++ char portstr[sizeof("65535")], *p; ++ len_and_sockaddr a = { }; ++ struct ns *tmp; ++ struct addrinfo *ai, *aip, hints = { ++ .ai_flags = AI_NUMERICSERV, ++ .ai_socktype = SOCK_DGRAM ++ }; ++ ++ if (parse_nsaddr(addr, &a)) { ++ /* Maybe we got a domain name, attempt to resolve it using the standard ++ * resolver routines */ ++ ++ p = strchr(addr, '#'); ++ snprintf(portstr, sizeof(portstr), "%hu", ++ (unsigned short)(p ? strtoul(p, NULL, 10) : default_port)); ++ ++ if (!getaddrinfo(addr, portstr, &hints, &ai)) { ++ for (aip = ai; aip; aip = aip->ai_next) { ++ if (aip->ai_addr->sa_family != AF_INET && ++ aip->ai_addr->sa_family != AF_INET6) ++ continue; ++ ++ tmp = realloc(*ns, sizeof(**ns) * (*n_ns + 1)); ++ ++ if (!tmp) ++ return NULL; ++ ++ *ns = tmp; ++ ++ (*ns)[*n_ns].name = addr; ++ (*ns)[*n_ns].replies = 0; ++ (*ns)[*n_ns].failures = 0; ++ (*ns)[*n_ns].addr.len = aip->ai_addrlen; ++ ++ memcpy(&(*ns)[*n_ns].addr.u.sa, aip->ai_addr, aip->ai_addrlen); ++ ++ (*n_ns)++; ++ } ++ ++ freeaddrinfo(ai); ++ ++ return &(*ns)[*n_ns]; ++ } ++ ++ return NULL; ++ } ++ ++ tmp = realloc(*ns, sizeof(**ns) * (*n_ns + 1)); ++ ++ if (!tmp) ++ return NULL; ++ ++ *ns = tmp; ++ ++ (*ns)[*n_ns].addr = a; ++ (*ns)[*n_ns].name = addr; ++ (*ns)[*n_ns].replies = 0; ++ (*ns)[*n_ns].failures = 0; ++ ++ return &(*ns)[(*n_ns)++]; ++} ++ ++static int parse_resolvconf(struct ns **ns, int *n_ns) ++{ ++ int prev_n_ns = *n_ns; ++ char line[128], *p; ++ FILE *resolv; ++ ++ if ((resolv = fopen("/etc/resolv.conf", "r")) != NULL) { ++ while (fgets(line, sizeof(line), resolv)) { ++ p = strtok(line, " \t\n"); ++ ++ if (!p || strcmp(p, "nameserver")) ++ continue; ++ ++ p = strtok(NULL, " \t\n"); ++ ++ if (!p) ++ continue; ++ ++ if (!add_ns(ns, n_ns, strdup(p))) { ++ free(p); ++ break; ++ } ++ } ++ ++ fclose(resolv); ++ } ++ ++ return *n_ns - prev_n_ns; ++} ++ ++static struct query *add_query(struct query **queries, int *n_queries, ++ int type, const char *dname) ++{ ++ struct query *tmp; ++ ssize_t qlen; ++ ++ tmp = realloc(*queries, sizeof(**queries) * (*n_queries + 1)); ++ ++ if (!tmp) ++ return NULL; ++ ++ memset(&tmp[*n_queries], 0, sizeof(*tmp)); ++ ++ qlen = res_mkquery(QUERY, dname, C_IN, type, NULL, 0, NULL, ++ tmp[*n_queries].query, sizeof(tmp[*n_queries].query)); ++ ++ tmp[*n_queries].qlen = qlen; ++ tmp[*n_queries].name = dname; ++ *queries = tmp; ++ ++ return &tmp[(*n_queries)++]; ++} ++ ++static char *sal2str(len_and_sockaddr *a) ++{ ++ static char buf[INET6_ADDRSTRLEN + 1 + IFNAMSIZ + 1 + 5 + 1]; ++ char *p = buf; ++ ++ if (a->u.sa.sa_family == AF_INET6) { ++ inet_ntop(AF_INET6, &a->u.sin6.sin6_addr, buf, sizeof(buf)); ++ p += strlen(p); ++ ++ if (a->u.sin6.sin6_scope_id) { ++ if (if_indextoname(a->u.sin6.sin6_scope_id, p + 1)) { ++ *p++ = '%'; ++ p += strlen(p); ++ } ++ } ++ } ++ else { ++ inet_ntop(AF_INET, &a->u.sin.sin_addr, buf, sizeof(buf)); ++ p += strlen(p); ++ } ++ ++ sprintf(p, "#%hu", ntohs(a->u.sin6.sin6_port)); ++ ++ return buf; ++} ++ ++ ++#if ENABLE_FEATURE_NSLOOKUP_LEDE_LONG_OPTIONS ++static const char nslookup_longopts[] ALIGN1 = ++ "type\0" Required_argument "q" ++ "querytype\0" Required_argument "q" ++ "port\0" Required_argument "p" ++ "retry\0" Required_argument "r" ++ "timeout\0" Required_argument "t" ++ "stats\0" Required_argument "s" ++ ; ++#endif ++ ++int nslookup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; ++int nslookup_main(int argc, char **argv) ++{ ++ int rc = 1; ++ char *ptr, *chr; ++ struct ns *ns = NULL; ++ struct query *queries = NULL; ++ llist_t *type_strings = NULL; ++ int n_ns = 0, n_queries = 0; ++ int c, opts, option_index = 0; ++ int stats = 0; ++ unsigned int types = 0; ++ HEADER *header; ++ ++#if ENABLE_FEATURE_NSLOOKUP_LEDE_LONG_OPTIONS ++ applet_long_options = nslookup_longopts; ++#endif ++ ++ opts = getopt32(argv, "+q:*p:+r:+t:+s", ++ &type_strings, &default_port, ++ &default_retry, &default_timeout); ++ ++ while (type_strings) { ++ ptr = llist_pop(&type_strings); ++ ++ /* skip leading text, e.g. when invoked with -querytype=AAAA */ ++ if ((chr = strchr(ptr, '=')) != NULL) { ++ ptr = chr; ++ *ptr++ = 0; ++ } ++ ++ for (c = 0; qtypes[c].name; c++) ++ if (!strcmp(qtypes[c].name, ptr)) ++ break; ++ ++ if (!qtypes[c].name) { ++ fprintf(stderr, "Invalid query type \"%s\"\n", ptr); ++ goto out; ++ } ++ ++ types |= (1 << c); ++ } ++ ++ if (default_port > 65535) { ++ fprintf(stderr, "Invalid server port\n"); ++ goto out; ++ } ++ ++ if (!default_retry) { ++ fprintf(stderr, "Invalid retry value\n"); ++ goto out; ++ } ++ ++ if (!default_timeout) { ++ fprintf(stderr, "Invalid timeout value\n"); ++ goto out; ++ } ++ ++ stats = (opts & 16); ++ ++ if (optind >= argc) ++ bb_show_usage(); ++ ++ for (option_index = optind; ++ option_index < ((argc - optind) > 1 ? argc - 1 : argc); ++ option_index++) { ++ ++ /* No explicit type given, guess query type. ++ * If we can convert the domain argument into a ptr (means that ++ * inet_pton() could read it) we assume a PTR request, else ++ * we issue A queries. */ ++ if (types == 0) { ++ ptr = make_ptr(argv[option_index]); ++ ++ if (ptr) ++ add_query(&queries, &n_queries, T_PTR, ptr); ++ else ++ add_query(&queries, &n_queries, T_A, argv[option_index]); ++ } ++ else { ++ for (c = 0; qtypes[c].name; c++) ++ if (types & (1 << c)) ++ add_query(&queries, &n_queries, qtypes[c].type, ++ argv[option_index]); ++ } ++ } ++ ++ /* Use given DNS server if present */ ++ if (option_index < argc) { ++ if (!add_ns(&ns, &n_ns, argv[option_index])) { ++ fprintf(stderr, "Invalid NS server address \"%s\": %s\n", ++ argv[option_index], strerror(errno)); ++ goto out; ++ } ++ } ++ else { ++ parse_resolvconf(&ns, &n_ns); ++ } ++ ++ /* Fall back to localhost if we could not find NS in resolv.conf */ ++ if (n_ns == 0) { ++ add_ns(&ns, &n_ns, "127.0.0.1"); ++ } ++ ++ for (c = 0; c < n_ns; c++) { ++ rc = send_queries(&ns[c], 1, queries, n_queries); ++ ++ if (rc < 0) { ++ fprintf(stderr, "Failed to send queries: %s\n", strerror(errno)); ++ goto out; ++ } else if (rc > 0) { ++ break; ++ } ++ } ++ ++ if (c >= n_ns) { ++ fprintf(stderr, ++ ";; connection timed out; no servers could be reached\n\n"); ++ ++ return 1; ++ } ++ ++ printf("Server:\t\t%s\n", ns[c].name); ++ printf("Address:\t%s\n", sal2str(&ns[c].addr)); ++ ++ if (stats) { ++ printf("Replies:\t%d\n", ns[c].replies); ++ printf("Failures:\t%d\n", ns[c].failures); ++ } ++ ++ printf("\n"); ++ ++ for (rc = 0; rc < n_queries; rc++) { ++ if (stats) { ++ printf("Query #%d completed in %lums:\n", rc, queries[rc].latency); ++ } ++ ++ if (queries[rc].rcode != 0) { ++ printf("** server can't find %s: %s\n", queries[rc].name, ++ rcodes[queries[rc].rcode]); ++ continue; ++ } ++ ++ c = 0; ++ ++ if (queries[rc].rlen) { ++ header = (HEADER *)queries[rc].reply; ++ ++ if (!header->aa) ++ printf("Non-authoritative answer:\n"); ++ ++ c = parse_reply(queries[rc].reply, queries[rc].rlen); ++ } ++ ++ if (c == 0) ++ printf("*** Can't find %s: No answer\n", queries[rc].name); ++ else if (c < 0) ++ printf("*** Can't find %s: Parse error\n", queries[rc].name); ++ ++ printf("\n"); ++ } ++ ++ rc = 0; ++ ++out: ++ if (n_ns) ++ free(ns); ++ ++ if (n_queries) ++ free(queries); ++ ++ return rc; ++} +-- +2.1.4 + |