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Add getservbyname and getservbyport (#204)

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For every call of getservbyname/getservbyport the lookup of
/etc/services is done by opening the file and parsing each line
one-by-one. This is slow, but the implementation is simple.

This change also adds fixes for the gethostbyname function.
This commit is contained in:
Gautham 2021-07-05 05:01:42 +05:30 • committed by GitHub
parent cfbd2afc19
commit 0ea2907730
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GPG key ID: 4AEE18F83AFDEB23
8 changed files with 412 additions and 25 deletions
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23
libc/dns/gethostbyaddr.c
View file

@ -31,23 +31,24 @@
struct hostent *gethostbyaddr(const void *s_addr, socklen_t len, int type) {
static struct hostent *ptr1, he1;
static char h_name[DNS_NAME_MAX+1];
static char* h_aliases[1];
static char* h_addr_list[2];
static char h_addr_list0[4];
struct sockaddr_in addr;
char name[DNS_NAME_MAX + 1];
if (!ptr1) {
he1.h_name = NULL;
he1.h_name = h_name;
he1.h_aliases = (char **)malloc(sizeof(char *) * 1);
if (!he1.h_aliases) return NULL;
he1.h_aliases = h_aliases;
he1.h_aliases[0] = NULL;
he1.h_addrtype = AF_INET;
he1.h_length = 4;
he1.h_addr_list = (char **)malloc(sizeof(char *) * 2);
if (!he1.h_addr_list) return NULL;
he1.h_addr_list = h_addr_list;
he1.h_addr_list[0] = (char *)malloc(sizeof(uint32_t));
if (!he1.h_addr_list[0]) return NULL;
he1.h_addr_list[0] = h_addr_list0;
he1.h_addr_list[1] = NULL;
ptr1 = &he1;
@ -58,12 +59,10 @@ struct hostent *gethostbyaddr(const void *s_addr, socklen_t len, int type) {
addr.sin_port = 0;
addr.sin_addr.s_addr = *(uint32_t *)(s_addr);
if (getnameinfo((struct sockaddr *)&addr, sizeof(addr), name, sizeof(name),
NULL, 0, 0))
if (getnameinfo((struct sockaddr *)&addr, sizeof(addr), ptr1->h_name,
DNS_NAME_MAX, NULL, 0, 0))
return NULL;
if (ptr1->h_name) free(ptr1->h_name);
ptr1->h_name = strdup(name);
*((uint32_t *)ptr1->h_addr_list[0]) = (addr.sin_addr.s_addr);
return ptr1;