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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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13
libc/dns/ent.h
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@ -16,12 +16,25 @@ struct hostent {
};
#define h_addr h_addr_list[0]
struct servent {
char *s_name; /* official service name */
char **s_aliases; /* alias list */
int s_port; /* port number (in network byte order) */
char *s_proto; /* protocol to use */
};
struct hostent *gethostent(void);
struct hostent *gethostbyname(const char *);
struct hostent *gethostbyaddr(const void *, socklen_t, int);
void sethostent(int);
void endhostent(void);
struct servent *getservent(void);
struct servent *getservbyname(const char *, const char *);
struct servent *getservbyport(int, const char *);
void setservent(int);
void endservent(void);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_DNS_ENT_H_ */