busybox: fix build of nslookup_lede applet without IPv6 (#728)
Protect any IPv6 related with appropriate guards to fix compilation with disabled IPv6 support in Busybox. Fixes #728. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich
parent
e1d433b293
commit
8ed5c6d3b1
1 changed files with 33 additions and 9 deletions
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@ -1,4 +1,4 @@
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From 8c1440a0934dd8b3ad6aae48d6653b5ba6fce8a1 Mon Sep 17 00:00:00 2001
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From 2285cd400a10b1bde5472fe1cec3311300ee943c Mon Sep 17 00:00:00 2001
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From: Jo-Philipp Wich <jo@mein.io>
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Date: Tue, 14 Mar 2017 22:21:34 +0100
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Subject: [PATCH] networking: add LEDE nslookup applet
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@ -12,16 +12,16 @@ and the libresolv primitives to parse received DNS responses.
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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---
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networking/nslookup_lede.c | 869 +++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 875 insertions(+)
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networking/nslookup_lede.c | 893 +++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 893 insertions(+)
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create mode 100644 networking/nslookup_lede.c
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diff --git a/networking/nslookup_lede.c b/networking/nslookup_lede.c
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new file mode 100644
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index 0000000..fe927ad
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index 000000000..6f1f86502
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--- /dev/null
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+++ b/networking/nslookup_lede.c
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@@ -0,0 +1,869 @@
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@@ -0,0 +1,893 @@
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+/*
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+ * nslookup_lede - musl compatible replacement for busybox nslookup
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+ *
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@ -109,7 +109,9 @@ index 0000000..fe927ad
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+ { ns_t_soa, "SOA" },
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+ { ns_t_ns, "NS" },
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+ { ns_t_a, "A" },
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+#if ENABLE_FEATURE_IPV6
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+ { ns_t_aaaa, "AAAA" },
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+#endif
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+ { ns_t_cname, "CNAME" },
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+ { ns_t_mx, "MX" },
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+ { ns_t_txt, "TXT" },
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@ -176,6 +178,7 @@ index 0000000..fe927ad
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+ printf("Name:\t%s\nAddress: %s\n", ns_rr_name(rr), astr);
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+ break;
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+
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+#if ENABLE_FEATURE_IPV6
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+ case ns_t_aaaa:
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+ if (rdlen != 16) {
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+ //fprintf(stderr, "Unexpected AAAA record length\n");
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@ -184,6 +187,7 @@ index 0000000..fe927ad
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+ inet_ntop(AF_INET6, ns_rr_rdata(rr), astr, sizeof(astr));
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+ printf("%s\thas AAAA address %s\n", ns_rr_name(rr), astr);
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+ break;
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+#endif
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+
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+ case ns_t_ns:
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+ if (!format)
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@ -326,6 +330,7 @@ index 0000000..fe927ad
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+ }
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+ }
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+
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+#if ENABLE_FEATURE_IPV6
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+ if (inet_pton(AF_INET6, addrstr, &lsa->u.sin6.sin6_addr)) {
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+ lsa->u.sin6.sin6_family = AF_INET6;
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+ lsa->u.sin6.sin6_port = htons(port);
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@ -333,6 +338,7 @@ index 0000000..fe927ad
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+ lsa->len = sizeof(lsa->u.sin6);
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+ return 0;
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+ }
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+#endif
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+
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+ if (!scope && inet_pton(AF_INET, addrstr, &lsa->u.sin.sin_addr)) {
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+ lsa->u.sin.sin_family = AF_INET;
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@ -387,6 +393,7 @@ index 0000000..fe927ad
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+ return (unsigned long)ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
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+}
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+
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+#if ENABLE_FEATURE_IPV6
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+static void to_v4_mapped(len_and_sockaddr *a)
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+{
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+ if (a->u.sa.sa_family != AF_INET)
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@ -403,6 +410,7 @@ index 0000000..fe927ad
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+ a->u.sin6.sin6_scope_id = 0;
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+ a->len = sizeof(a->u.sin6);
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+}
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+#endif
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+
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+
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+/*
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@ -414,7 +422,9 @@ index 0000000..fe927ad
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+ int fd;
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+ int timeout = default_timeout * 1000, retry_interval, servfail_retry = 0;
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+ len_and_sockaddr from = { };
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+#if ENABLE_FEATURE_IPV6
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+ int one = 1;
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+#endif
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+ int recvlen = 0;
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+ int n_replies = 0;
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+ struct pollfd pfd;
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@ -424,6 +434,7 @@ index 0000000..fe927ad
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+ from.u.sa.sa_family = AF_INET;
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+ from.len = sizeof(from.u.sin);
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+
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+#if ENABLE_FEATURE_IPV6
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+ for (nn = 0; nn < n_ns; nn++) {
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+ if (ns[nn].addr.u.sa.sa_family == AF_INET6) {
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+ from.u.sa.sa_family = AF_INET6;
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@ -431,15 +442,18 @@ index 0000000..fe927ad
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+ break;
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+ }
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+ }
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+#endif
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+
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+ /* Get local address and open/bind a socket */
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+ fd = socket(from.u.sa.sa_family, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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+
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+#if ENABLE_FEATURE_IPV6
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+ /* Handle case where system lacks IPv6 support */
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+ if (fd < 0 && from.u.sa.sa_family == AF_INET6 && errno == EAFNOSUPPORT) {
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+ fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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+ from.u.sa.sa_family = AF_INET;
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+ }
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+#endif
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+
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+ if (fd < 0)
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+ return -1;
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@ -449,6 +463,7 @@ index 0000000..fe927ad
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+ return -1;
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+ }
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+
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+#if ENABLE_FEATURE_IPV6
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+ /* Convert any IPv4 addresses in a mixed environment to v4-mapped */
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+ if (from.u.sa.sa_family == AF_INET6) {
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+ setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
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@ -456,6 +471,7 @@ index 0000000..fe927ad
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+ for (nn = 0; nn < n_ns; nn++)
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+ to_v4_mapped(&ns[nn].addr);
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+ }
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+#endif
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+
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+ pfd.fd = fd;
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+ pfd.events = POLLIN;
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@ -585,7 +601,12 @@ index 0000000..fe927ad
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+ for (aip = ai; aip; aip = aip->ai_next) {
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+ if (aip->ai_addr->sa_family != AF_INET &&
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+ aip->ai_addr->sa_family != AF_INET6)
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+ continue;
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+ continue;
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+
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+#if ! ENABLE_FEATURE_IPV6
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+ if (aip->ai_addr->sa_family != AF_INET)
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+ continue;
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+#endif
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+
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+ tmp = realloc(*ns, sizeof(**ns) * (*n_ns + 1));
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+
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@ -685,6 +706,7 @@ index 0000000..fe927ad
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+ static char buf[INET6_ADDRSTRLEN + 1 + IFNAMSIZ + 1 + 5 + 1];
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+ char *p = buf;
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+
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+#if ENABLE_FEATURE_IPV6
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+ if (a->u.sa.sa_family == AF_INET6) {
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+ inet_ntop(AF_INET6, &a->u.sin6.sin6_addr, buf, sizeof(buf));
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+ p += strlen(p);
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@ -696,12 +718,14 @@ index 0000000..fe927ad
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+ }
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+ }
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+ }
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+ else {
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+ else
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+#endif
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+ {
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+ inet_ntop(AF_INET, &a->u.sin.sin_addr, buf, sizeof(buf));
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+ p += strlen(p);
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+ }
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+
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+ sprintf(p, "#%hu", ntohs(a->u.sin6.sin6_port));
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+ sprintf(p, "#%hu", ntohs(a->u.sin.sin_port));
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+
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+ return buf;
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+}
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@ -892,5 +916,5 @@ index 0000000..fe927ad
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+ return rc;
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+}
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--
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2.1.4
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2.11.0
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