/
misc.c
1702 lines (1457 loc) · 38 KB
/
misc.c
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/*
* misc.c Various miscellaneous functions.
*
* Version: $Id$
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Copyright 2000,2006 The FreeRADIUS server project
*/
RCSID("$Id$")
#include <freeradius-devel/libradius.h>
#include <ctype.h>
#include <sys/file.h>
#include <fcntl.h>
#define FR_PUT_LE16(a, val)\
do {\
a[1] = ((uint16_t) (val)) >> 8;\
a[0] = ((uint16_t) (val)) & 0xff;\
} while (0)
#ifdef HAVE_PTHREAD_H
# define PTHREAD_MUTEX_LOCK pthread_mutex_lock
# define PTHREAD_MUTEX_UNLOCK pthread_mutex_unlock
#else
# define PTHREAD_MUTEX_LOCK(_x)
# define PTHREAD_MUTEX_UNLOCK(_x)
#endif
bool fr_dns_lookups = false; /* IP -> hostname lookups? */
bool fr_hostname_lookups = true; /* hostname -> IP lookups? */
int fr_debug_flag = 0;
static char const *months[] = {
"jan", "feb", "mar", "apr", "may", "jun",
"jul", "aug", "sep", "oct", "nov", "dec" };
fr_thread_local_setup(char *, fr_inet_ntop_buffer); /* macro */
typedef struct fr_talloc_link {
bool armed;
TALLOC_CTX *child;
} fr_talloc_link_t;
/** Sets a signal handler using sigaction if available, else signal
*
* @param sig to set handler for.
* @param func handler to set.
*/
int fr_set_signal(int sig, sig_t func)
{
#ifdef HAVE_SIGACTION
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
act.sa_handler = func;
if (sigaction(sig, &act, NULL) < 0) {
fr_strerror_printf("Failed setting signal %i handler via sigaction(): %s", sig, fr_syserror(errno));
return -1;
}
#else
if (signal(sig, func) < 0) {
fr_strerror_printf("Failed setting signal %i handler via signal(): %s", sig, fr_syserror(errno));
return -1;
}
#endif
return 0;
}
static int _fr_trigger_talloc_ctx_free(fr_talloc_link_t *trigger)
{
if (trigger->armed) talloc_free(trigger->child);
return 0;
}
static int _fr_disarm_talloc_ctx_free(bool **armed)
{
**armed = false;
return 0;
}
/** Link a parent and a child context, so the child is freed before the parent
*
* @note This is not thread safe. Do not free parent before threads are joined, do not call from a child thread.
* @note It's OK to free the child before threads are joined, but this will leak memory until the parent is freed.
*
* @param parent who's fate the child should share.
* @param child bound to parent's lifecycle.
* @return 0 on success -1 on failure.
*/
int fr_link_talloc_ctx_free(TALLOC_CTX *parent, TALLOC_CTX *child)
{
fr_talloc_link_t *trigger;
bool **disarm;
trigger = talloc(parent, fr_talloc_link_t);
if (!trigger) return -1;
disarm = talloc(child, bool *);
if (!disarm) {
talloc_free(trigger);
return -1;
}
trigger->child = child;
trigger->armed = true;
*disarm = &trigger->armed;
talloc_set_destructor(trigger, _fr_trigger_talloc_ctx_free);
talloc_set_destructor(disarm, _fr_disarm_talloc_ctx_free);
return 0;
}
/*
* Explicitly cleanup the memory allocated to the error inet_ntop
* buffer.
*/
static void _fr_inet_ntop_free(void *arg)
{
free(arg);
}
/** Wrapper around inet_ntop, prints IPv4/IPv6 addresses
*
* inet_ntop requires the caller pass in a buffer for the address.
* This would be annoying and cumbersome, seeing as quite often the ASCII
* address is only used for logging output.
*
* So as with lib/log.c use TLS to allocate thread specific buffers, and
* write the IP address there instead.
*
* @param af address family, either AF_INET or AF_INET6.
* @param src pointer to network address structure.
* @return NULL on error, else pointer to ASCII buffer containing text version of address.
*/
char const *fr_inet_ntop(int af, void const *src)
{
char *buffer;
if (!src) {
return NULL;
}
buffer = fr_thread_local_init(fr_inet_ntop_buffer, _fr_inet_ntop_free);
if (!buffer) {
int ret;
/*
* malloc is thread safe, talloc is not
*/
buffer = malloc(sizeof(char) * INET6_ADDRSTRLEN);
if (!buffer) {
fr_perror("Failed allocating memory for inet_ntop buffer");
return NULL;
}
ret = fr_thread_local_set(fr_inet_ntop_buffer, buffer);
if (ret != 0) {
fr_perror("Failed setting up TLS for inet_ntop buffer: %s", fr_syserror(ret));
free(buffer);
return NULL;
}
}
buffer[0] = '\0';
return inet_ntop(af, src, buffer, INET6_ADDRSTRLEN);
}
/*
* Return an IP address in standard dot notation
*
* FIXME: DELETE THIS
*/
char const *ip_ntoa(char *buffer, uint32_t ipaddr)
{
ipaddr = ntohl(ipaddr);
sprintf(buffer, "%d.%d.%d.%d",
(ipaddr >> 24) & 0xff,
(ipaddr >> 16) & 0xff,
(ipaddr >> 8) & 0xff,
(ipaddr ) & 0xff);
return buffer;
}
/** Parse an IPv4 address or IPv4 prefix in presentation format (and others)
*
* @param out Where to write the ip address value.
* @param value to parse, may be dotted quad [+ prefix], or integer, or octal number, or '*' (INADDR_ANY).
* @param inlen Length of value, if value is \0 terminated inlen may be 0.
* @param resolve If true and value doesn't look like an IP address, try and resolve value as a hostname.
* @param fallback to IPv4 resolution if no A records can be found.
* @return 0 if ip address was parsed successfully, else -1 on error.
*/
int fr_pton4(fr_ipaddr_t *out, char const *value, size_t inlen, bool resolve, bool fallback)
{
char *p;
unsigned int prefix;
char *eptr;
/* Dotted quad + / + [0-9]{1,2} */
char buffer[INET_ADDRSTRLEN + 3];
/*
* Copy to intermediary buffer if we were given a length
*/
if (inlen > 0) {
if (inlen >= sizeof(buffer)) {
fr_strerror_printf("Invalid IPv4 address string \"%s\"", value);
return -1;
}
memcpy(buffer, value, inlen);
buffer[inlen] = '\0';
}
p = strchr(value, '/');
/*
* 192.0.2.2 is parsed as if it was /32
*/
if (!p) {
/*
* Allow '*' as the wildcard address usually 0.0.0.0
*/
if ((value[0] == '*') && (value[1] == '\0')) {
out->ipaddr.ip4addr.s_addr = htonl(INADDR_ANY);
/*
* Convert things which are obviously integers to IP addresses
*
* We assume the number is the bigendian representation of the
* IP address.
*/
} else if (is_integer(value) || ((value[0] == '0') && (value[1] == 'x'))) {
out->ipaddr.ip4addr.s_addr = htonl(strtoul(value, NULL, 0));
} else if (!resolve) {
if (inet_pton(AF_INET, value, &(out->ipaddr.ip4addr.s_addr)) <= 0) {
fr_strerror_printf("Failed to parse IPv4 address string \"%s\"", value);
return -1;
}
} else if (ip_hton(out, AF_INET, value, fallback) < 0) return -1;
out->prefix = 32;
out->af = AF_INET;
return 0;
}
/*
* Otherwise parse the prefix
*/
if ((size_t)(p - value) >= INET_ADDRSTRLEN) {
fr_strerror_printf("Invalid IPv4 address string \"%s\"", value);
return -1;
}
/*
* Copy the IP portion into a temporary buffer if we haven't already.
*/
if (inlen == 0) memcpy(buffer, value, p - value);
buffer[p - value] = '\0';
if (!resolve) {
if (inet_pton(AF_INET, buffer, &(out->ipaddr.ip4addr.s_addr)) <= 0) {
fr_strerror_printf("Failed to parse IPv4 address string \"%s\"", value);
return -1;
}
} else if (ip_hton(out, AF_INET, buffer, fallback) < 0) return -1;
prefix = strtoul(p + 1, &eptr, 10);
if (prefix > 32) {
fr_strerror_printf("Invalid IPv4 mask length \"%s\". Should be between 0-32", p);
return -1;
}
if (eptr[0] != '\0') {
fr_strerror_printf("Failed to parse IPv4 address string \"%s\", "
"got garbage after mask length \"%s\"", value, eptr);
return -1;
}
if (prefix < 32) {
out->ipaddr.ip4addr = fr_inaddr_mask(&(out->ipaddr.ip4addr), prefix);
}
out->prefix = (uint8_t) prefix;
out->af = AF_INET;
return 0;
}
/** Parse an IPv6 address or IPv6 prefix in presentation format (and others)
*
* @param out Where to write the ip address value.
* @param value to parse.
* @param inlen Length of value, if value is \0 terminated inlen may be 0.
* @param resolve If true and value doesn't look like an IP address, try and resolve value as a hostname.
* @param fallback to IPv4 resolution if no AAAA records can be found.
* @return 0 if ip address was parsed successfully, else -1 on error.
*/
int fr_pton6(fr_ipaddr_t *out, char const *value, size_t inlen, bool resolve, bool fallback)
{
char const *p;
unsigned int prefix;
char *eptr;
/* IPv6 + / + [0-9]{1,3} */
char buffer[INET6_ADDRSTRLEN + 4];
/*
* Copy to intermediary buffer if we were given a length
*/
if (inlen > 0) {
if (inlen >= sizeof(buffer)) {
fr_strerror_printf("Invalid IPv6 address string \"%s\"", value);
return -1;
}
memcpy(buffer, value, inlen);
buffer[inlen] = '\0';
}
p = strchr(value, '/');
if (!p) {
/*
* Allow '*' as the wildcard address
*/
if ((value[0] == '*') && (value[1] == '\0')) {
memset(&out->ipaddr.ip6addr.s6_addr, 0, sizeof(out->ipaddr.ip6addr.s6_addr));
} else if (!resolve) {
if (inet_pton(AF_INET6, value, &(out->ipaddr.ip6addr.s6_addr)) <= 0) {
fr_strerror_printf("Failed to parse IPv6 address string \"%s\"", value);
return -1;
}
} else if (ip_hton(out, AF_INET6, value, fallback) < 0) return -1;
out->prefix = 128;
out->af = AF_INET6;
return 0;
}
if ((p - value) >= INET6_ADDRSTRLEN) {
fr_strerror_printf("Invalid IPv6 address string \"%s\"", value);
return -1;
}
/*
* Copy string to temporary buffer if we didn't do it earlier
*/
if (inlen == 0) memcpy(buffer, value, p - value);
buffer[p - value] = '\0';
if (!resolve) {
if (inet_pton(AF_INET6, buffer, &(out->ipaddr.ip6addr.s6_addr)) <= 0) {
fr_strerror_printf("Failed to parse IPv6 address string \"%s\"", value);
return -1;
}
} else if (ip_hton(out, AF_INET6, buffer, fallback) < 0) return -1;
prefix = strtoul(p + 1, &eptr, 10);
if (prefix > 128) {
fr_strerror_printf("Invalid IPv6 mask length \"%s\". Should be between 0-128", p);
return -1;
}
if (eptr[0] != '\0') {
fr_strerror_printf("Failed to parse IPv6 address string \"%s\", "
"got garbage after mask length \"%s\"", value, eptr);
return -1;
}
if (prefix < 128) {
struct in6_addr addr;
addr = fr_in6addr_mask(&(out->ipaddr.ip6addr), prefix);
memcpy(&(out->ipaddr.ip6addr.s6_addr), &addr, sizeof(addr));
}
out->prefix = (uint8_t) prefix;
out->af = AF_INET6;
return 0;
}
/** Simple wrapper to decide whether an IP value is v4 or v6 and call the appropriate parser.
*
* @param out Where to write the ip address value.
* @param value to parse.
* @param inlen Length of value, if value is \0 terminated inlen may be 0.
* @param resolve If true and value doesn't look like an IP address, try and resolve value as a hostname.
* @return 0 if ip address was parsed successfully, else -1 on error.
*/
int fr_pton(fr_ipaddr_t *out, char const *value, size_t inlen, bool resolve)
{
size_t len, i;
len = (inlen == 0) ? strlen(value) : inlen;
for (i = 0; i < len; i++) switch (value[i]) {
/*
* Chars illegal in domain names and IPv4 addresses.
* Must be v6 and cannot be a domain.
*/
case ':':
case '[':
case ']':
return fr_pton6(out, value, inlen, false, false);
/*
* Chars which don't really tell us anything
*/
case '.':
case '/':
continue;
default:
/*
* Outside the range of IPv4 chars, must be a domain
* Use A record in preference to AAAA record.
*/
if ((value[i] < '0') || (value[i] > '9')) {
if (!resolve) return -1;
return fr_pton4(out, value, inlen, true, true);
}
break;
}
/*
* All chars were in the IPv4 set [0-9/.], must be an IPv4
* address.
*/
return fr_pton4(out, value, inlen, false, false);
}
int fr_ntop(char *out, size_t outlen, fr_ipaddr_t *addr)
{
char buffer[INET6_ADDRSTRLEN];
if (inet_ntop(addr->af, &(addr->ipaddr), buffer, sizeof(buffer)) == NULL) return -1;
return snprintf(out, outlen, "%s/%i", buffer, addr->prefix);
}
/*
* Internal wrapper for locking, to minimize the number of ifdef's
*
* Use fcntl or error
*/
int rad_lockfd(int fd, int lock_len)
{
#ifdef F_WRLCK
struct flock fl;
fl.l_start = 0;
fl.l_len = lock_len;
fl.l_pid = getpid();
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_CUR;
return fcntl(fd, F_SETLKW, (void *)&fl);
#else
#error "missing definition for F_WRLCK, all file locks will fail"
return -1;
#endif
}
/*
* Internal wrapper for locking, to minimize the number of ifdef's
*
* Lock an fd, prefer lockf() over flock()
* Nonblocking version.
*/
int rad_lockfd_nonblock(int fd, int lock_len)
{
#ifdef F_WRLCK
struct flock fl;
fl.l_start = 0;
fl.l_len = lock_len;
fl.l_pid = getpid();
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_CUR;
return fcntl(fd, F_SETLK, (void *)&fl);
#else
#error "missing definition for F_WRLCK, all file locks will fail"
return -1;
#endif
}
/*
* Internal wrapper for unlocking, to minimize the number of ifdef's
* in the source.
*
* Unlock an fd, prefer lockf() over flock()
*/
int rad_unlockfd(int fd, int lock_len)
{
#ifdef F_WRLCK
struct flock fl;
fl.l_start = 0;
fl.l_len = lock_len;
fl.l_pid = getpid();
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_CUR;
return fcntl(fd, F_UNLCK, (void *)&fl);
#else
#error "missing definition for F_WRLCK, all file locks will fail"
return -1;
#endif
}
/*
* Return an interface-id in standard colon notation
*/
char *ifid_ntoa(char *buffer, size_t size, uint8_t const *ifid)
{
snprintf(buffer, size, "%x:%x:%x:%x",
(ifid[0] << 8) + ifid[1], (ifid[2] << 8) + ifid[3],
(ifid[4] << 8) + ifid[5], (ifid[6] << 8) + ifid[7]);
return buffer;
}
/*
* Return an interface-id from
* one supplied in standard colon notation.
*/
uint8_t *ifid_aton(char const *ifid_str, uint8_t *ifid)
{
static char const xdigits[] = "0123456789abcdef";
char const *p, *pch;
int num_id = 0, val = 0, idx = 0;
for (p = ifid_str; ; ++p) {
if (*p == ':' || *p == '\0') {
if (num_id <= 0)
return NULL;
/*
* Drop 'val' into the array.
*/
ifid[idx] = (val >> 8) & 0xff;
ifid[idx + 1] = val & 0xff;
if (*p == '\0') {
/*
* Must have all entries before
* end of the string.
*/
if (idx != 6)
return NULL;
break;
}
val = 0;
num_id = 0;
if ((idx += 2) > 6)
return NULL;
} else if ((pch = strchr(xdigits, tolower(*p))) != NULL) {
if (++num_id > 4)
return NULL;
/*
* Dumb version of 'scanf'
*/
val <<= 4;
val |= (pch - xdigits);
} else
return NULL;
}
return ifid;
}
#ifndef HAVE_INET_PTON
static int inet_pton4(char const *src, struct in_addr *dst)
{
int octet;
unsigned int num;
char const *p, *off;
uint8_t tmp[4];
static char const digits[] = "0123456789";
octet = 0;
p = src;
while (1) {
num = 0;
while (*p && ((off = strchr(digits, *p)) != NULL)) {
num *= 10;
num += (off - digits);
if (num > 255) return 0;
p++;
}
if (!*p) break;
/*
* Not a digit, MUST be a dot, else we
* die.
*/
if (*p != '.') {
return 0;
}
tmp[octet++] = num;
p++;
}
/*
* End of the string. At the fourth
* octet is OK, anything else is an
* error.
*/
if (octet != 3) {
return 0;
}
tmp[3] = num;
memcpy(dst, &tmp, sizeof(tmp));
return 1;
}
#ifdef HAVE_STRUCT_SOCKADDR_IN6
/* int
* inet_pton6(src, dst)
* convert presentation level address to network order binary form.
* return:
* 1 if `src' is a valid [RFC1884 2.2] address, else 0.
* notice:
* (1) does not touch `dst' unless it's returning 1.
* (2) :: in a full address is silently ignored.
* credit:
* inspired by Mark Andrews.
* author:
* Paul Vixie, 1996.
*/
static int inet_pton6(char const *src, unsigned char *dst)
{
static char const xdigits_l[] = "0123456789abcdef",
xdigits_u[] = "0123456789ABCDEF";
u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
char const *xdigits, *curtok;
int ch, saw_xdigit;
u_int val;
memset((tp = tmp), 0, IN6ADDRSZ);
endp = tp + IN6ADDRSZ;
colonp = NULL;
/* Leading :: requires some special handling. */
if (*src == ':')
if (*++src != ':')
return (0);
curtok = src;
saw_xdigit = 0;
val = 0;
while ((ch = *src++) != '\0') {
char const *pch;
if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
pch = strchr((xdigits = xdigits_u), ch);
if (pch != NULL) {
val <<= 4;
val |= (pch - xdigits);
if (val > 0xffff)
return (0);
saw_xdigit = 1;
continue;
}
if (ch == ':') {
curtok = src;
if (!saw_xdigit) {
if (colonp)
return (0);
colonp = tp;
continue;
}
if (tp + INT16SZ > endp)
return (0);
*tp++ = (u_char) (val >> 8) & 0xff;
*tp++ = (u_char) val & 0xff;
saw_xdigit = 0;
val = 0;
continue;
}
if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
inet_pton4(curtok, (struct in_addr *) tp) > 0) {
tp += INADDRSZ;
saw_xdigit = 0;
break; /* '\0' was seen by inet_pton4(). */
}
return (0);
}
if (saw_xdigit) {
if (tp + INT16SZ > endp)
return (0);
*tp++ = (u_char) (val >> 8) & 0xff;
*tp++ = (u_char) val & 0xff;
}
if (colonp != NULL) {
/*
* Since some memmove()'s erroneously fail to handle
* overlapping regions, we'll do the shift by hand.
*/
int const n = tp - colonp;
int i;
for (i = 1; i <= n; i++) {
endp[- i] = colonp[n - i];
colonp[n - i] = 0;
}
tp = endp;
}
if (tp != endp)
return (0);
/* bcopy(tmp, dst, IN6ADDRSZ); */
memcpy(dst, tmp, IN6ADDRSZ);
return (1);
}
#endif
/*
* Utility function, so that the rest of the server doesn't
* have ifdef's around IPv6 support
*/
int inet_pton(int af, char const *src, void *dst)
{
if (af == AF_INET) {
return inet_pton4(src, dst);
}
#ifdef HAVE_STRUCT_SOCKADDR_IN6
if (af == AF_INET6) {
return inet_pton6(src, dst);
}
#endif
return -1;
}
#endif
#ifndef HAVE_INET_NTOP
/*
* Utility function, so that the rest of the server doesn't
* have ifdef's around IPv6 support
*/
char const *inet_ntop(int af, void const *src, char *dst, size_t cnt)
{
if (af == AF_INET) {
uint8_t const *ipaddr = src;
if (cnt <= INET_ADDRSTRLEN) return NULL;
snprintf(dst, cnt, "%d.%d.%d.%d",
ipaddr[0], ipaddr[1],
ipaddr[2], ipaddr[3]);
return dst;
}
/*
* If the system doesn't define this, we define it
* in missing.h
*/
if (af == AF_INET6) {
struct in6_addr const *ipaddr = src;
if (cnt <= INET6_ADDRSTRLEN) return NULL;
snprintf(dst, cnt, "%x:%x:%x:%x:%x:%x:%x:%x",
(ipaddr->s6_addr[0] << 8) | ipaddr->s6_addr[1],
(ipaddr->s6_addr[2] << 8) | ipaddr->s6_addr[3],
(ipaddr->s6_addr[4] << 8) | ipaddr->s6_addr[5],
(ipaddr->s6_addr[6] << 8) | ipaddr->s6_addr[7],
(ipaddr->s6_addr[8] << 8) | ipaddr->s6_addr[9],
(ipaddr->s6_addr[10] << 8) | ipaddr->s6_addr[11],
(ipaddr->s6_addr[12] << 8) | ipaddr->s6_addr[13],
(ipaddr->s6_addr[14] << 8) | ipaddr->s6_addr[15]);
return dst;
}
return NULL; /* don't support IPv6 */
}
#endif
/** Wrappers for IPv4/IPv6 host to IP address lookup
*
* This function returns only one IP address, of the specified address family,
* or the first address (of whatever family), if AF_UNSPEC is used.
*
* If fallback is specified and af is AF_INET, but not AF_INET records were
* found and a record for AF_INET6 exists that record will be returned.
*
* If fallback is specified and af is AF_INET6, and a record with AF_INET4 exists
* that record will be returned inseted.
*
* @param out Where to write result.
* @param af To search for in preference.
* @param hostname to search for.
* @param fallback to the other adress family, if no records matching af, found.
* @return 0 on success, else -1 on failure.
*/
int ip_hton(fr_ipaddr_t *out, int af, char const *hostname, bool fallback)
{
int rcode;
struct addrinfo hints, *ai = NULL, *alt = NULL, *res = NULL;
if (!fr_hostname_lookups) {
#ifdef HAVE_STRUCT_SOCKADDR_IN6
if (af == AF_UNSPEC) {
char const *p;
for (p = hostname; *p != '\0'; p++) {
if ((*p == ':') ||
(*p == '[') ||
(*p == ']')) {
af = AF_INET6;
break;
}
}
}
#endif
if (af == AF_UNSPEC) af = AF_INET;
if (!inet_pton(af, hostname, &(out->ipaddr))) {
return -1;
}
out->af = af;
return 0;
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
#ifdef TALLOC_DEBUG
/*
* Avoid malloc for IP addresses. This helps us debug
* memory errors when using talloc.
*/
if (af == AF_INET) {
/*
* If it's all numeric, avoid getaddrinfo()
*/
if (inet_pton(af, hostname, &out->ipaddr.ip4addr) == 1) {
return 0;
}
}
#endif
if ((rcode = getaddrinfo(hostname, NULL, &hints, &res)) != 0) {
fr_strerror_printf("ip_hton: %s", gai_strerror(rcode));
return -1;
}
for (ai = res; ai; ai = ai->ai_next) {
if ((af == ai->ai_family) || (af == AF_UNSPEC)) break;
if (!alt && fallback && ((ai->ai_family == AF_INET) || (ai->ai_family == AF_INET6))) alt = ai;
}
if (!ai) ai = alt;
if (!ai) {
fr_strerror_printf("ip_hton failed to find requested information for host %.100s", hostname);
freeaddrinfo(res);
return -1;
}
rcode = fr_sockaddr2ipaddr((struct sockaddr_storage *)ai->ai_addr,
ai->ai_addrlen, out, NULL);
freeaddrinfo(res);
if (!rcode) return -1;
return 0;
}
/*
* Look IP addresses up, and print names (depending on DNS config)
*/
char const *ip_ntoh(fr_ipaddr_t const *src, char *dst, size_t cnt)
{
struct sockaddr_storage ss;
int error;
socklen_t salen;
/*
* No DNS lookups
*/
if (!fr_dns_lookups) {
return inet_ntop(src->af, &(src->ipaddr), dst, cnt);
}
if (!fr_ipaddr2sockaddr(src, 0, &ss, &salen)) {
return NULL;
}
if ((error = getnameinfo((struct sockaddr *)&ss, salen, dst, cnt, NULL, 0,
NI_NUMERICHOST | NI_NUMERICSERV)) != 0) {
fr_strerror_printf("ip_ntoh: %s", gai_strerror(error));
return NULL;
}
return dst;
}
/** Mask off a portion of an IPv4 address
*
* @param ipaddr to mask.
* @param prefix Number of contiguous bits to mask.
* @return an ipv6 address with the host portion zeroed out.
*/
struct in_addr fr_inaddr_mask(struct in_addr const *ipaddr, uint8_t prefix)
{
uint32_t ret;
if (prefix > 32) {
prefix = 32;
}
/* Short circuit */
if (prefix == 32) {
return *ipaddr;
}
if (prefix == 0)
ret = 0;
else ret = htonl(~((0x00000001UL << (32 - prefix)) - 1)) & ipaddr->s_addr;
return (*(struct in_addr *)&ret);
}
/** Mask off a portion of an IPv6 address
*
* @param ipaddr to mask.
* @param prefix Number of contiguous bits to mask.
* @return an ipv6 address with the host portion zeroed out.
*/
struct in6_addr fr_in6addr_mask(struct in6_addr const *ipaddr, uint8_t prefix)
{
uint64_t const *p = (uint64_t const *) ipaddr;
uint64_t ret[2], *o = ret;
if (prefix > 128) {
prefix = 128;
}
/* Short circuit */
if (prefix == 128) {
return *ipaddr;
}
if (prefix >= 64) {
prefix -= 64;
*o++ = 0xffffffffffffffffULL & *p++;
} else {
ret[1] = 0;
}
*o = htonll(~((0x0000000000000001ULL << (64 - prefix)) - 1)) & *p;
return *(struct in6_addr *) &ret;
}
/** Zeroes out the host portion of an fr_ipaddr_t
*
* @param[in,out] addr to mask
* @param[in] prefix Length of the network portion.
*/
void fr_ipaddr_mask(fr_ipaddr_t *addr, uint8_t prefix)
{
switch (addr->af) {
case AF_INET:
addr->ipaddr.ip4addr = fr_inaddr_mask(&addr->ipaddr.ip4addr, prefix);
break;
case AF_INET6:
addr->ipaddr.ip6addr = fr_in6addr_mask(&addr->ipaddr.ip6addr, prefix);
break;
default:
return;
}
addr->prefix = prefix;