Re: [libvirt] [PATCH 1/2] util: add wrapper function to check if address string is an ip

--- src/util/network.c | 37 +++++++++++++++++++++++++++++++++++++ src/util/network.h | 2 ++ 2 files changed, 39 insertions(+), 0 deletions(-) diff --git a/src/util/network.c b/src/util/network.c index 6e24792..2e0cf9c 100644 --- a/src/util/network.c +++ b/src/util/network.c @@ -54,6 +54,43 @@ static int getIPv6Addr(virSocketAddrPtr addr, virIPv6AddrPtr tab) { } /** + * virIsNumericIPAddr: + * @address: a text string containing a host name or IPv4/IPv6 address + * + * Given a text string, determines whether it contains a valid IPv4/IPv6 + * address. + * + * Returns 0 if the given string is an IPv4 or IPv6 address, or non-zero + * for any other condition. + */ +int +virIsNumericIPAddr(const char *address) { + int returnCode; + struct addrinfo hints; + struct addrinfo *res = NULL; + + /* Sanity check we've been given a text string */ + if (address == NULL) + return(-1); + + /* Do a name lookup on the given string, and see what we're given back */ + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; /* Doesn't matter whether IPv4 or IPv6 */ + hints.ai_socktype = 0; /* Socket type doesn't matter */ + hints.ai_flags = AI_NUMERICHOST; /* Force a numeric IP address check */ + hints.ai_protocol = 0; /* Doesn't matter which protocol */ + returnCode = getaddrinfo (address, NULL, &hints, &res); + if (0 == returnCode) { + /* A result was returned. This means the text string we were + * given is a valid IP address. We now free the result(s) we + * were given, and pass back the return code */ + freeaddrinfo(res); + } + + return returnCode; +}