[Minios-devel] [UNIKRAFT/LWIP PATCH v2 1/5] Import getnameinfo() function from OsV

[Costin Lupu <costin.lupu@xxxxxxxxx>]

Copied as it is from official OsV git mirror
https://github.com/cloudius-systems/osv.git, commit ee7a2cd4.

Original file location: libc/network/getnameinfo.c

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
Reviewed-by: Felipe Huici <felipe.huici@xxxxxxxxx>
---
 getnameinfo.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 getnameinfo.c

diff --git a/getnameinfo.c b/getnameinfo.c
new file mode 100644
index 0000000..fc5acf6
--- /dev/null
+++ b/getnameinfo.c
@@ -0,0 +1,80 @@
+#include <osv/debug.h>
+#include <netdb.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "__dns.hh"
+
+int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
+       char *restrict node, socklen_t nodelen,
+       char *restrict serv, socklen_t servlen,
+       int flags)
+{
+       char buf[256];
+       unsigned char reply[512];
+       int af = sa->sa_family;
+       char line[512];
+       FILE *f;
+       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;
+       }
+
+       /* Try to find ip within /etc/hosts */
+       if ((node && nodelen) && (af == AF_INET)) {
+               const char *ipstr = inet_ntoa(((struct sockaddr_in 
*)sa)->sin_addr);
+               size_t l = strlen(ipstr);
+               f = fopen("/etc/hosts", "r");
+               if (f) while (fgets(line, sizeof line, f)) {
+                       if (strncmp(line, ipstr, l) != 0)
+                               continue;
+
+                       char *domain = strtok(line, " ");
+                       if (!domain) continue;
+                       domain = strtok(NULL, " ");
+                       if (!domain) continue;
+
+                       if (strlen(domain) >= nodelen) return EAI_OVERFLOW;
+                       strcpy(node, domain);
+                       fclose(f);
+                       return 0;
+               }
+               if (f) fclose(f);
+       }
+
+       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;
+}
-- 
2.20.1


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