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libwebsockets/lib/core-net/network.c
Andy Green c9731c5f17 type comparisons: fixes 
This is a huge patch that should be a global NOP.

For unix type platforms it enables -Wconversion to issue warnings (-> error)
for all automatic casts that seem less than ideal but are normally concealed
by the toolchain.

This is things like passing an int to a size_t argument.  Once enabled, I
went through all args on my default build (which build most things) and
tried to make the removed default cast explicit.

With that approach it neither change nor bloat the code, since it compiles
to whatever it was doing before, just with the casts made explicit... in a
few cases I changed some length args from int to size_t but largely left
the causes alone.

From now on, new code that is relying on less than ideal casting
will complain and nudge me to improve it by warnings.
2021-01-05 10:56:38 +00:00

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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "private-lib-core.h"
#include <errno.h>
#if !defined(LWS_PLAT_FREERTOS) && !defined(LWS_PLAT_OPTEE)
static int
interface_to_sa(struct lws_vhost *vh, const char *ifname,
struct sockaddr_in *addr, size_t addrlen, int allow_ipv6)
{
int ipv6 = 0;
#ifdef LWS_WITH_IPV6
if (allow_ipv6)
ipv6 = LWS_IPV6_ENABLED(vh);
#endif
(void)vh;
return lws_interface_to_sa(ipv6, ifname, addr, addrlen);
}
#endif
#ifndef LWS_PLAT_OPTEE
static int
lws_get_addresses(struct lws_vhost *vh, void *ads, char *name,
int name_len, char *rip, int rip_len)
{
struct addrinfo ai, *res;
struct sockaddr_in addr4;
rip[0] = '\0';
name[0] = '\0';
addr4.sin_family = AF_UNSPEC;
#ifdef LWS_WITH_IPV6
if (LWS_IPV6_ENABLED(vh)) {
if (!lws_plat_inet_ntop(AF_INET6,
&((struct sockaddr_in6 *)ads)->sin6_addr,
rip, (socklen_t)rip_len)) {
lwsl_err("inet_ntop: %s", strerror(LWS_ERRNO));
return -1;
}
// Strip off the IPv4 to IPv6 header if one exists
if (strncmp(rip, "::ffff:", 7) == 0)
memmove(rip, rip + 7, strlen(rip) - 6);
getnameinfo((struct sockaddr *)ads, sizeof(struct sockaddr_in6),
name, (socklen_t)name_len, NULL, 0, 0);
return 0;
} else
#endif
{
struct addrinfo *result;
memset(&ai, 0, sizeof ai);
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = SOCK_STREAM;
#if !defined(LWS_PLAT_FREERTOS)
if (getnameinfo((struct sockaddr *)ads,
sizeof(struct sockaddr_in),
name, (unsigned int)name_len, NULL, 0, 0))
return -1;
#endif
if (getaddrinfo(name, NULL, &ai, &result))
return -1;
res = result;
while (addr4.sin_family == AF_UNSPEC && res) {
switch (res->ai_family) {
case AF_INET:
addr4.sin_addr =
((struct sockaddr_in *)res->ai_addr)->sin_addr;
addr4.sin_family = AF_INET;
break;
}
res = res->ai_next;
}
freeaddrinfo(result);
}
if (addr4.sin_family == AF_UNSPEC)
return -1;
if (lws_plat_inet_ntop(AF_INET, &addr4.sin_addr, rip, (unsigned int)rip_len) == NULL)
return -1;
return 0;
}
const char *
lws_get_peer_simple_fd(lws_sockfd_type fd, char *name, size_t namelen)
{
lws_sockaddr46 sa46;
socklen_t len = sizeof(sa46);
if (getpeername(fd, (struct sockaddr *)&sa46, &len) < 0) {
lws_snprintf(name, namelen, "getpeername: %s",
strerror(LWS_ERRNO));
return name;
}
lws_sa46_write_numeric_address(&sa46, name, namelen);
return name;
}
const char *
lws_get_peer_simple(struct lws *wsi, char *name, size_t namelen)
{
wsi = lws_get_network_wsi(wsi);
return lws_get_peer_simple_fd(wsi->desc.sockfd, name, namelen);
}
#endif
void
lws_get_peer_addresses(struct lws *wsi, lws_sockfd_type fd, char *name,
int name_len, char *rip, int rip_len)
{
#ifndef LWS_PLAT_OPTEE
socklen_t len;
#ifdef LWS_WITH_IPV6
struct sockaddr_in6 sin6;
#endif
struct sockaddr_in sin4;
void *p;
rip[0] = '\0';
name[0] = '\0';
#ifdef LWS_WITH_IPV6
if (LWS_IPV6_ENABLED(wsi->a.vhost)) {
len = sizeof(sin6);
p = &sin6;
} else
#endif
{
len = sizeof(sin4);
p = &sin4;
}
if (getpeername(fd, p, &len) < 0) {
lwsl_warn("getpeername: %s\n", strerror(LWS_ERRNO));
goto bail;
}
lws_get_addresses(wsi->a.vhost, p, name, name_len, rip, rip_len);
bail:
#endif
(void)wsi;
(void)fd;
(void)name;
(void)name_len;
(void)rip;
(void)rip_len;
}
/* note: this returns a random port, or one of these <= 0 return codes:
*
* LWS_ITOSA_USABLE: the interface is usable, returned if so and sockfd invalid
* LWS_ITOSA_NOT_EXIST: the requested iface does not even exist
* LWS_ITOSA_NOT_USABLE: the requested iface exists but is not usable (eg, no IP)
* LWS_ITOSA_BUSY: the port at the requested iface + port is already in use
*/
int
lws_socket_bind(struct lws_vhost *vhost, lws_sockfd_type sockfd, int port,
const char *iface, int ipv6_allowed)
{
#ifdef LWS_WITH_UNIX_SOCK
struct sockaddr_un serv_unix;
#endif
#ifdef LWS_WITH_IPV6
struct sockaddr_in6 serv_addr6;
#endif
struct sockaddr_in serv_addr4;
#ifndef LWS_PLAT_OPTEE
socklen_t len = sizeof(struct sockaddr_storage);
#endif
int n;
#if !defined(LWS_PLAT_FREERTOS) && !defined(LWS_PLAT_OPTEE)
int m;
#endif
struct sockaddr_storage sin;
struct sockaddr *v;
memset(&sin, 0, sizeof(sin));
#if defined(LWS_WITH_UNIX_SOCK)
if (!port && LWS_UNIX_SOCK_ENABLED(vhost)) {
v = (struct sockaddr *)&serv_unix;
memset(&serv_unix, 0, sizeof(serv_unix));
serv_unix.sun_family = AF_UNIX;
if (!iface)
return LWS_ITOSA_NOT_EXIST;
if (sizeof(serv_unix.sun_path) <= strlen(iface)) {
lwsl_err("\"%s\" too long for UNIX domain socket\n",
iface);
return LWS_ITOSA_NOT_EXIST;
}
n = (int)(sizeof(uint16_t) + strlen(iface));
strcpy(serv_unix.sun_path, iface);
if (serv_unix.sun_path[0] == '@')
serv_unix.sun_path[0] = '\0';
else
unlink(serv_unix.sun_path);
// lwsl_hexdump_notice(v, n);
} else
#endif
#if defined(LWS_WITH_IPV6) && !defined(LWS_PLAT_FREERTOS)
if (ipv6_allowed && LWS_IPV6_ENABLED(vhost)) {
v = (struct sockaddr *)&serv_addr6;
n = sizeof(struct sockaddr_in6);
memset(&serv_addr6, 0, sizeof(serv_addr6));
if (iface) {
m = interface_to_sa(vhost, iface,
(struct sockaddr_in *)v, (unsigned int)n, 1);
if (m == LWS_ITOSA_NOT_USABLE) {
lwsl_info("%s: netif %s: Not usable\n",
__func__, iface);
return m;
}
if (m == LWS_ITOSA_NOT_EXIST) {
lwsl_info("%s: netif %s: Does not exist\n",
__func__, iface);
return m;
}
serv_addr6.sin6_scope_id = (unsigned int)lws_get_addr_scope(iface);
}
serv_addr6.sin6_family = AF_INET6;
serv_addr6.sin6_port = (uint16_t)htons((uint16_t)port);
} else
#endif
{
v = (struct sockaddr *)&serv_addr4;
n = sizeof(serv_addr4);
memset(&serv_addr4, 0, sizeof(serv_addr4));
serv_addr4.sin_addr.s_addr = INADDR_ANY;
serv_addr4.sin_family = AF_INET;
#if !defined(LWS_PLAT_FREERTOS) && !defined(LWS_PLAT_OPTEE)
if (iface) {
m = interface_to_sa(vhost, iface,
(struct sockaddr_in *)v, (unsigned int)n, 0);
if (m == LWS_ITOSA_NOT_USABLE) {
lwsl_info("%s: netif %s: Not usable\n",
__func__, iface);
return m;
}
if (m == LWS_ITOSA_NOT_EXIST) {
lwsl_info("%s: netif %s: Does not exist\n",
__func__, iface);
return m;
}
}
#endif
serv_addr4.sin_port = htons((uint16_t)(unsigned int)port);
} /* ipv4 */
/* just checking for the interface extant */
if (sockfd == LWS_SOCK_INVALID)
return LWS_ITOSA_USABLE;
n = bind(sockfd, v, (unsigned int)n);
#ifdef LWS_WITH_UNIX_SOCK
if (n < 0 && LWS_UNIX_SOCK_ENABLED(vhost)) {
lwsl_err("ERROR on binding fd %d to \"%s\" (%d %d)\n",
sockfd, iface, n, LWS_ERRNO);
return LWS_ITOSA_NOT_EXIST;
} else
#endif
if (n < 0) {
int _lws_errno = LWS_ERRNO;
lwsl_err("ERROR on binding fd %d to port %d (%d %d)\n",
sockfd, port, n, _lws_errno);
/* if something already listening, tell caller to fail permanently */
if (_lws_errno == LWS_EADDRINUSE)
return LWS_ITOSA_BUSY;
/* otherwise ask caller to retry later */
return LWS_ITOSA_NOT_EXIST;
}
#if defined(LWS_WITH_UNIX_SOCK) && !defined(WIN32)
if (!port && LWS_UNIX_SOCK_ENABLED(vhost)) {
uid_t uid = vhost->context->uid;
gid_t gid = vhost->context->gid;
if (vhost->unix_socket_perms) {
if (lws_plat_user_colon_group_to_ids(
vhost->unix_socket_perms, &uid, &gid)) {
lwsl_err("%s: Failed to translate %s\n",
__func__, vhost->unix_socket_perms);
return LWS_ITOSA_NOT_EXIST;
}
}
if (iface && iface[0] != '@' && uid && gid) {
if (chown(iface, uid, gid)) {
lwsl_err("%s: failed to set %s perms %u:%u\n",
__func__, iface,
(unsigned int)uid, (unsigned int)gid);
return LWS_ITOSA_NOT_EXIST;
}
lwsl_notice("%s: vh %s unix skt %s perms %u:%u\n",
__func__, vhost->name, iface,
(unsigned int)uid, (unsigned int)gid);
if (chmod(iface, 0660)) {
lwsl_err("%s: failed to set %s to 0600 mode\n",
__func__, iface);
return LWS_ITOSA_NOT_EXIST;
}
}
}
#endif
#ifndef LWS_PLAT_OPTEE
if (getsockname(sockfd, (struct sockaddr *)&sin, &len) == -1)
lwsl_warn("getsockname: %s\n", strerror(LWS_ERRNO));
else
#endif
#if defined(LWS_WITH_IPV6)
port = (sin.ss_family == AF_INET6) ?
ntohs(((struct sockaddr_in6 *) &sin)->sin6_port) :
ntohs(((struct sockaddr_in *) &sin)->sin_port);
#else
{
struct sockaddr_in sain;
memcpy(&sain, &sin, sizeof(sain));
port = ntohs(sain.sin_port);
}
#endif
return port;
}
#if defined(LWS_WITH_CLIENT)
unsigned int
lws_retry_get_delay_ms(struct lws_context *context,
const lws_retry_bo_t *retry, uint16_t *ctry,
char *conceal)
{
uint64_t ms = 3000, pc = 30; /* sane-ish defaults if no retry table */
uint16_t ra;
if (conceal)
*conceal = 0;
if (retry) {
if (*ctry < retry->retry_ms_table_count)
ms = retry->retry_ms_table[*ctry];
else
ms = retry->retry_ms_table[
retry->retry_ms_table_count - 1];
/* if no percent given, use the default 30% */
if (retry->jitter_percent)
pc = retry->jitter_percent;
}
if (lws_get_random(context, &ra, sizeof(ra)) == sizeof(ra))
ms += ((ms * pc * ra) >> 16) / 100;
else
assert(0);
if (*ctry < 0xffff)
(*ctry)++;
if (retry && conceal)
*conceal = (int)*ctry <= retry->conceal_count;
return (unsigned int)ms;
}
int
lws_retry_sul_schedule(struct lws_context *context, int tid,
lws_sorted_usec_list_t *sul,
const lws_retry_bo_t *retry, sul_cb_t cb, uint16_t *ctry)
{
char conceal;
uint64_t ms = lws_retry_get_delay_ms(context, retry, ctry, &conceal);
if (!conceal)
return 1;
lwsl_info("%s: sul %p: scheduling retry in %dms\n", __func__, sul,
(int)ms);
lws_sul_schedule(context, tid, sul, cb, (int64_t)(ms * 1000));
return 0;
}
int
lws_retry_sul_schedule_retry_wsi(struct lws *wsi, lws_sorted_usec_list_t *sul,
sul_cb_t cb, uint16_t *ctry)
{
char conceal;
lws_usec_t us = lws_retry_get_delay_ms(wsi->a.context,
wsi->retry_policy, ctry,
&conceal) * LWS_US_PER_MS;
if (!conceal)
/* if our reties are up, they're up... */
return 1;
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
if (
#if defined(LWS_ROLE_H1)
wsi->role_ops == &role_ops_h1
#endif
#if defined(LWS_ROLE_H1) && defined(LWS_ROLE_H2)
||
#endif
#if defined(LWS_ROLE_H2)
wsi->role_ops == &role_ops_h2
#endif
)
/*
* Since we're doing it by wsi, we're in a position to check for
* http retry-after, it will increase us accordingly if found
*/
lws_http_check_retry_after(wsi, &us);
#endif
lws_sul_schedule(wsi->a.context, wsi->tsi, sul, cb, us);
return 0;
}
#endif
#if defined(LWS_WITH_IPV6)
unsigned long
lws_get_addr_scope(const char *ifname_or_ipaddr)
{
unsigned long scope;
char ip[NI_MAXHOST];
unsigned int i;
#if !defined(WIN32)
struct ifaddrs *addrs, *addr;
#else
PIP_ADAPTER_ADDRESSES adapter, addrs = NULL;
PIP_ADAPTER_UNICAST_ADDRESS addr;
struct sockaddr_in6 *sockaddr;
ULONG size = 0;
int found = 0;
DWORD ret;
#endif
/*
* First see if we can look the string up as a network interface name...
* windows vista+ also has this
*/
scope = if_nametoindex(ifname_or_ipaddr);
if (scope > 0)
/* we found it from the interface name lookup */
return scope;
/*
* if not, try to look it up as an IP -> interface -> interface index
*/
scope = 0;
#if !defined(WIN32)
getifaddrs(&addrs);
for (addr = addrs; addr; addr = addr->ifa_next) {
if (!addr->ifa_addr ||
addr->ifa_addr->sa_family != AF_INET6)
continue;
ip[0] = '\0';
getnameinfo(addr->ifa_addr,
sizeof(struct sockaddr_in6),
ip, sizeof(ip),
NULL, 0, NI_NUMERICHOST);
i = 0;
while (ip[i])
if (ip[i++] == '%') {
ip[i - 1] = '\0';
break;
}
if (!strcmp(ip, ifname_or_ipaddr)) {
scope = if_nametoindex(addr->ifa_name);
break;
}
}
freeifaddrs(addrs);
#else
for (i = 0; i < 5; i++)
{
ret = GetAdaptersAddresses(AF_INET6, GAA_FLAG_INCLUDE_PREFIX,
NULL, addrs, &size);
if ((ret == NO_ERROR) || (ret == ERROR_NO_DATA)) {
break;
} else if (ret == ERROR_BUFFER_OVERFLOW)
{
if (addrs)
free(addrs);
addrs = (IP_ADAPTER_ADDRESSES *)malloc(size);
} else
{
if (addrs)
{
free(addrs);
addrs = NULL;
}
lwsl_err("Failed to get IPv6 address table (%d)", ret);
break;
}
}
if ((ret == NO_ERROR) && (addrs)) {
adapter = addrs;
while (adapter && !found) {
addr = adapter->FirstUnicastAddress;
while (addr && !found) {
if (addr->Address.lpSockaddr->sa_family ==
AF_INET6) {
sockaddr = (struct sockaddr_in6 *)
(addr->Address.lpSockaddr);
lws_plat_inet_ntop(sockaddr->sin6_family,
&sockaddr->sin6_addr,
ip, sizeof(ip));
if (!strcmp(ip, ifname_or_ipaddr)) {
scope = sockaddr->sin6_scope_id;
found = 1;
break;
}
}
addr = addr->Next;
}
adapter = adapter->Next;
}
}
if (addrs)
free(addrs);
#endif
return scope;
}
#endif
/*
* https://en.wikipedia.org/wiki/IPv6_address
*
* An IPv6 address is represented as eight groups of four hexadecimal digits,
* each group representing 16 bits (two octets, a group sometimes also called a
* hextet[6][7]). The groups are separated by colons (:). An example of an IPv6
* address is:
*
* 2001:0db8:85a3:0000:0000:8a2e:0370:7334
*
* The hexadecimal digits are case-insensitive, but IETF recommendations suggest
* the use of lower case letters. The full representation of eight 4-digit
* groups may be simplified by several techniques, eliminating parts of the
* representation.
*
* Leading zeroes in a group may be omitted, but each group must retain at least
* one hexadecimal digit.[1] Thus, the example address may be written as:
*
* 2001:db8:85a3:0:0:8a2e:370:7334
*
* One or more consecutive groups containing zeros only may be replaced with a
* single empty group, using two consecutive colons (::).[1] The substitution
* may only be applied once in the address, however, because multiple
* occurrences would create an ambiguous representation. Thus, the example
* address can be further simplified:
*
* 2001:db8:85a3::8a2e:370:7334
*
* The localhost (loopback) address, 0:0:0:0:0:0:0:1, and the IPv6 unspecified
* address, 0:0:0:0:0:0:0:0, are reduced to ::1 and ::, respectively.
*
* During the transition of the Internet from IPv4 to IPv6, it is typical to
* operate in a mixed addressing environment. For such use cases, a special
* notation has been introduced, which expresses IPv4-mapped and IPv4-compatible
* IPv6 addresses by writing the least-significant 32 bits of an address in the
* familiar IPv4 dot-decimal notation, whereas the other 96 (most significant)
* bits are written in IPv6 format. For example, the IPv4-mapped IPv6 address
* ::ffff:c000:0280 is written as ::ffff:192.0.2.128, thus expressing clearly
* the original IPv4 address that was mapped to IPv6.
*/
int
lws_parse_numeric_address(const char *ads, uint8_t *result, size_t max_len)
{
struct lws_tokenize ts;
uint8_t *orig = result, temp[16];
int sects = 0, ipv6 = !!strchr(ads, ':'), skip_point = -1, dm = 0;
char t[5];
size_t n;
long u;
lws_tokenize_init(&ts, ads, LWS_TOKENIZE_F_NO_INTEGERS |
LWS_TOKENIZE_F_MINUS_NONTERM);
ts.len = strlen(ads);
if (!ipv6 && ts.len < 7)
return -1;
if (ipv6 && ts.len < 2)
return -2;
if (!ipv6 && max_len < 4)
return -3;
if (ipv6 && max_len < 16)
return -4;
if (ipv6)
memset(result, 0, max_len);
do {
ts.e = (int8_t)lws_tokenize(&ts);
switch (ts.e) {
case LWS_TOKZE_TOKEN:
dm = 0;
if (ipv6) {
if (ts.token_len > 4)
return -1;
memcpy(t, ts.token, ts.token_len);
t[ts.token_len] = '\0';
for (n = 0; n < ts.token_len; n++)
if (t[n] < '0' || t[n] > 'f' ||
(t[n] > '9' && t[n] < 'A') ||
(t[n] > 'F' && t[n] < 'a'))
return -1;
u = strtol(t, NULL, 16);
if (u > 0xffff)
return -5;
*result++ = (uint8_t)(u >> 8);
} else {
if (ts.token_len > 3)
return -1;
memcpy(t, ts.token, ts.token_len);
t[ts.token_len] = '\0';
for (n = 0; n < ts.token_len; n++)
if (t[n] < '0' || t[n] > '9')
return -1;
u = strtol(t, NULL, 10);
if (u > 0xff)
return -6;
}
if (u < 0)
return -7;
*result++ = (uint8_t)u;
sects++;
break;
case LWS_TOKZE_DELIMITER:
if (dm++) {
if (dm > 2)
return -8;
if (*ts.token != ':')
return -9;
/* back to back : */
*result++ = 0;
*result++ = 0;
skip_point = lws_ptr_diff(result, orig);
break;
}
if (ipv6 && orig[2] == 0xff && orig[3] == 0xff &&
skip_point == 2) {
/* ipv4 backwards compatible format */
ipv6 = 0;
memset(orig, 0, max_len);
orig[10] = 0xff;
orig[11] = 0xff;
skip_point = -1;
result = &orig[12];
sects = 0;
break;
}
if (ipv6 && *ts.token != ':')
return -10;
if (!ipv6 && *ts.token != '.')
return -11;
break;
case LWS_TOKZE_ENDED:
if (!ipv6 && sects == 4)
return lws_ptr_diff(result, orig);
if (ipv6 && sects == 8)
return lws_ptr_diff(result, orig);
if (skip_point != -1) {
int ow = lws_ptr_diff(result, orig);
/*
* contains ...::...
*/
if (ow == 16)
return 16;
memcpy(temp, &orig[skip_point], (unsigned int)(ow - skip_point));
memset(&orig[skip_point], 0, (unsigned int)(16 - skip_point));
memcpy(&orig[16 - (ow - skip_point)], temp,
(unsigned int)(ow - skip_point));
return 16;
}
return -12;
default: /* includes ENDED */
lwsl_err("%s: malformed ip address\n",
__func__);
return -13;
}
} while (ts.e > 0 && result - orig <= (int)max_len);
lwsl_err("%s: ended on e %d\n", __func__, ts.e);
return -14;
}
int
lws_sa46_parse_numeric_address(const char *ads, lws_sockaddr46 *sa46)
{
uint8_t a[16];
int n;
n = lws_parse_numeric_address(ads, a, sizeof(a));
if (n < 0)
return -1;
#if defined(LWS_WITH_IPV6)
if (n == 16) {
sa46->sa6.sin6_family = AF_INET6;
memcpy(sa46->sa6.sin6_addr.s6_addr, a,
sizeof(sa46->sa6.sin6_addr.s6_addr));
return 0;
}
#endif
if (n != 4)
return -1;
sa46->sa4.sin_family = AF_INET;
memcpy(&sa46->sa4.sin_addr.s_addr, a,
sizeof(sa46->sa4.sin_addr.s_addr));
return 0;
}
int
lws_write_numeric_address(const uint8_t *ads, int size, char *buf, size_t len)
{
char c, elided = 0, soe = 0, zb = (char)-1, n, ipv4 = 0;
const char *e = buf + len;
char *obuf = buf;
int q = 0;
if (size == 4)
return lws_snprintf(buf, len, "%u.%u.%u.%u",
ads[0], ads[1], ads[2], ads[3]);
if (size != 16)
return -1;
for (c = 0; c < (char)size / 2; c++) {
uint16_t v = (uint16_t)((ads[q] << 8) | ads[q + 1]);
if (buf + 8 > e)
return -1;
q += 2;
if (soe) {
if (v)
*buf++ = ':';
/* fall thru to print hex value */
} else
if (!elided && !soe && !v) {
elided = soe = 1;
zb = c;
continue;
}
if (ipv4) {
n = (char)lws_snprintf(buf, lws_ptr_diff_size_t(e, buf), "%u.%u",
ads[q - 2], ads[q - 1]);
buf += n;
if (c == 6)
*buf++ = '.';
} else {
if (soe && !v)
continue;
if (c)
*buf++ = ':';
buf += lws_snprintf(buf, lws_ptr_diff_size_t(e, buf), "%x", v);
if (soe && v) {
soe = 0;
if (c == 5 && v == 0xffff && !zb) {
ipv4 = 1;
*buf++ = ':';
}
}
}
}
if (buf + 3 > e)
return -1;
if (soe) { /* as is the case for all zeros */
*buf++ = ':';
*buf++ = ':';
*buf = '\0';
}
return lws_ptr_diff(buf, obuf);
}
int
lws_sa46_write_numeric_address(lws_sockaddr46 *sa46, char *buf, size_t len)
{
*buf = '\0';
#if defined(LWS_WITH_IPV6)
if (sa46->sa4.sin_family == AF_INET6)
return lws_write_numeric_address(
(uint8_t *)&sa46->sa6.sin6_addr, 16, buf, len);
#endif
if (sa46->sa4.sin_family == AF_INET)
return lws_write_numeric_address(
(uint8_t *)&sa46->sa4.sin_addr, 4, buf, len);
return -1;
}
int
lws_sa46_compare_ads(const lws_sockaddr46 *sa46a, const lws_sockaddr46 *sa46b)
{
if (sa46a->sa4.sin_family != sa46b->sa4.sin_family)
return 1;
#if defined(LWS_WITH_IPV6)
if (sa46a->sa4.sin_family == AF_INET6)
return memcmp(&sa46a->sa6.sin6_addr, &sa46b->sa6.sin6_addr, 16);
#endif
if (sa46a->sa4.sin_family == AF_INET)
return sa46a->sa4.sin_addr.s_addr != sa46b->sa4.sin_addr.s_addr;
return 0;
}
void
lws_4to6(uint8_t *v6addr, const uint8_t *v4addr)
{
v6addr[12] = v4addr[0];
v6addr[13] = v4addr[1];
v6addr[14] = v4addr[2];
v6addr[15] = v4addr[3];
memset(v6addr, 0, 10);
v6addr[10] = v6addr[11] = 0xff;
}
#if defined(LWS_WITH_IPV6)
void
lws_sa46_4to6(lws_sockaddr46 *sa46, const uint8_t *v4addr, uint16_t port)
{
sa46->sa4.sin_family = AF_INET6;
lws_4to6((uint8_t *)&sa46->sa6.sin6_addr.s6_addr[0], v4addr);
sa46->sa6.sin6_port = htons(port);
}
#endif
int
lws_sa46_on_net(const lws_sockaddr46 *sa46a, const lws_sockaddr46 *sa46_net,
int net_len)
{
uint8_t mask = 0xff, norm[16];
const uint8_t *p1, *p2;
if (sa46a->sa4.sin_family == AF_INET) {
p1 = (uint8_t *)&sa46a->sa4.sin_addr;
if (sa46_net->sa4.sin_family == AF_INET6) {
/* ip is v4, net is v6, promote ip to v6 */
lws_4to6(norm, p1);
p1 = norm;
}
#if defined(LWS_WITH_IPV6)
} else
if (sa46a->sa4.sin_family == AF_INET6) {
p1 = (uint8_t *)&sa46a->sa6.sin6_addr;
#endif
} else
return 1;
if (sa46_net->sa4.sin_family == AF_INET) {
p2 = (uint8_t *)&sa46_net->sa4.sin_addr;
if (sa46a->sa4.sin_family == AF_INET6) {
/* ip is v6, net is v4, promote net to v6 */
lws_4to6(norm, p2);
p2 = norm;
/* because the mask length is for net v4 address */
net_len += 12 * 8;
}
#if defined(LWS_WITH_IPV6)
} else
if (sa46a->sa4.sin_family == AF_INET6) {
p2 = (uint8_t *)&sa46_net->sa6.sin6_addr;
#endif
} else
return 1;
while (net_len > 0) {
if (net_len < 8)
mask = (uint8_t)(mask << (8 - net_len));
if (((*p1++) & mask) != ((*p2++) & mask))
return 1;
net_len -= 8;
}
return 0;
}
void
lws_sa46_copy_address(lws_sockaddr46 *sa46a, const void *in, int af)
{
sa46a->sa4.sin_family = (sa_family_t)af;
if (af == AF_INET)
memcpy(&sa46a->sa4.sin_addr, in, 4);
#if defined(LWS_WITH_IPV6)
else if (af == AF_INET6)
memcpy(&sa46a->sa6.sin6_addr, in, sizeof(sa46a->sa6.sin6_addr));
#endif
}
#if defined(LWS_WITH_SYS_STATE)
lws_state_manager_t *
lws_system_get_state_manager(struct lws_context *context)
{
return &context->mgr_system;
}
#endif
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