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GETNETENT(3) FreeBSD Library Functions Manual GETNETENT(3) NAME getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent - get network entry LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <netdb.h> struct netent * getnetent(); struct netent * getnetbyname(const char *name); struct netent * getnetbyaddr(uint32_t net, int type); setnetent(int stayopen); endnetent(); DESCRIPTION The getnetent(), getnetbyname(), and getnetbyaddr() functions each return a pointer to an object with the following structure containing the broken-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 machine 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() function and getnetbyaddr() 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 order. FILES /etc/networks DIAGNOSTICS Null pointer (0) returned on EOF or error. SEE ALSO networks(5), nsswitch.conf(5) HISTORY The getnetent(), getnetbyaddr(), getnetbyname(), setnetent(), and endnetent() functions appeared in 4.2BSD. BUGS 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 functions overwrite it. Only Internet network numbers are currently understood. Expecting network numbers to fit in no more than 32 bits is probably naive. FreeBSD 14.1-RELEASE-p8 May 8, 2004 FreeBSD 14.1-RELEASE-p8