getnetbyname(3) - NetBSD Manual Pages

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GETNETENT(3)            NetBSD Library Functions Manual           GETNETENT(3)

getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent -- get net- work entry
Standard C Library (libc, -lc)
#include <netdb.h> struct netent * getnetent(); struct netent * getnetbyname(const char *name); struct netent * getnetbyaddr(uint32_t net, int type); void setnetent(int stayopen); void endnetent(void);
The getnetent(), getnetbyname(), and getnetbyaddr() functions each return a pointer to an object with the following structure containing the bro- ken-out fields of a line in the network data base as described in networks(5). struct netent { char *n_name; /* official name of net */ char **n_aliases; /* alias list */ int n_addrtype; /* net number type */ uint32_t n_net; /* net number */ }; The members of this structure are: n_name The official name of the network. n_aliases A zero terminated list of alternative names for the network. n_addrtype The type of the network number returned; currently only AF_INET. n_net The network number. Network numbers are returned in host byte order. The getnetent() function reads the next line of the file, opening the file if necessary. The setnetent() function opens and rewinds the file. If the stayopen flag is non-zero, the net data base will not be closed after each call to getnetbyname() or getnetbyaddr(). The endnetent() function closes the file. The getnetbyname() and getnetbyaddr() functions sequentially search from the beginning of the file until a matching net name or net address and type is found, or until EOF is encountered. Network numbers are supplied in host byte order.
Null pointer (NULL) returned on EOF or error.
networks(5), nsswitch.conf(5)
The getnetent(), getnetbyaddr(), getnetbyname(), setnetent(), and endnetent() functions appeared in 4.2BSD.
The data space used by these functions is static; if future use requires the data, it should be copied before any subsequent calls to these func- tions overwrite it. Only Internet network numbers are currently under- stood. Expecting network numbers to fit in no more than 32 bits is prob- ably naive. NetBSD 10.99 February 21, 2018 NetBSD 10.99
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