Re: [Minios-devel] [UNIKRAFT/LWIP PATCH 3/5] Import getnameinfo() function from OsV

[Felipe Huici <Felipe.Huici@xxxxxxxxx>]

Hi Bogdan, Costin, this patch looks good.

-- Felipe

Reviewed-by: Felipe Huici <felipe.huici@xxxxxxxxx>

On 02.08.19, 14:57, "Costin Lupu" <costin.lupu@xxxxxxxxx> wrote:

    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>
    ---
     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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