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authorRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
commit0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch)
tree6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/network/getnameinfo.c
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initial check-in, version 0.5.0v0.5.0
Diffstat (limited to 'src/network/getnameinfo.c')
-rw-r--r--src/network/getnameinfo.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/src/network/getnameinfo.c b/src/network/getnameinfo.c
new file mode 100644
index 00000000..0763ca88
--- /dev/null
+++ b/src/network/getnameinfo.c
@@ -0,0 +1,54 @@
+#include <netdb.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "__dns.h"
+
+int getnameinfo(const struct sockaddr *sa, socklen_t sl,
+ char *node, socklen_t nodelen,
+ char *serv, socklen_t servlen,
+ int flags)
+{
+ char buf[256];
+ unsigned char reply[512];
+ int af = sa->sa_family;
+ unsigned char *a;
+
+ switch (af) {
+ case AF_INET:
+ a = (void *)&((struct sockaddr_in *)sa)->sin_addr;
+ if (sl != sizeof(struct sockaddr_in)) return EAI_FAMILY;
+ break;
+ case AF_INET6:
+ a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr;
+ if (sl != sizeof(struct sockaddr_in6)) return EAI_FAMILY;
+ break;
+ default:
+ return EAI_FAMILY;
+ }
+
+ if (node && nodelen) {
+ if ((flags & NI_NUMERICHOST)
+ || __dns_query(reply, a, af, 1) <= 0
+ || __dns_get_rr(buf, 0, 256, 1, reply, RR_PTR, 1) <= 0)
+ {
+ if (flags & NI_NAMEREQD) return EAI_NONAME;
+ inet_ntop(af, a, buf, sizeof buf);
+ }
+ if (strlen(buf) >= nodelen) return EAI_OVERFLOW;
+ strcpy(node, buf);
+ }
+
+ if (serv && servlen) {
+ if (snprintf(buf, sizeof buf, "%d",
+ ntohs(((struct sockaddr_in *)sa)->sin_port))>=servlen)
+ return EAI_OVERFLOW;
+ strcpy(serv, buf);
+ }
+
+ return 0;
+}