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proxy_getaddrinfo: implement support for numeric ipv6

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closes #282
This commit is contained in:
rofl0r
2019-04-25 14:36:03 +01:00
parent 067885694d
commit 5ad7c2a183
1 changed files with 38 additions and 6 deletions
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44
src/core.c
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@@ -789,7 +789,7 @@ struct hostent *proxy_gethostbyname(const char *name, struct gethostbyname_data*
struct addrinfo_data {
struct addrinfo addrinfo_space;
struct sockaddr sockaddr_space;
struct sockaddr_storage sockaddr_space;
char addr_name[256];
};
@@ -822,6 +822,33 @@ static int mygetservbyname_r(const char* name, const char* proto, struct servent
return ret;
}
static int looks_like_numeric_ipv6(const char *node)
{
if(!strchr(node, ':')) return 0;
const char* p= node;
while(1) switch(*(p++)) {
case 0: return 1;
case ':': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
break;
default: return 0;
}
}
static int my_inet_aton(const char *node, struct addrinfo_data* space)
{
int ret;
((struct sockaddr_in *) &space->sockaddr_space)->sin_family = AF_INET;
ret = inet_aton(node, &((struct sockaddr_in *) &space->sockaddr_space)->sin_addr);
if(ret || !looks_like_numeric_ipv6(node)) return ret;
ret = inet_pton(AF_INET6, node, &((struct sockaddr_in6 *) &space->sockaddr_space)->sin6_addr);
if(ret) ((struct sockaddr_in6 *) &space->sockaddr_space)->sin6_family = AF_INET6;
return ret;
}
int proxy_getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
struct gethostbyname_data ghdata;
struct addrinfo_data *space;
@@ -830,14 +857,14 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
struct servent se_buf;
struct addrinfo *p;
char buf[1024];
int port;
int port, af = AF_INET;
PFUNC();
// printf("proxy_getaddrinfo node %s service %s\n",node,service);
space = calloc(1, sizeof(struct addrinfo_data));
if(!space) goto err1;
if(node && !inet_aton(node, &((struct sockaddr_in *) &space->sockaddr_space)->sin_addr)) {
if(node && !my_inet_aton(node, space)) {
/* some folks (nmap) use getaddrinfo() with AI_NUMERICHOST to check whether a string
containing a numeric ip was passed. we must return failure in that case. */
if(hints && (hints->ai_flags & AI_NUMERICHOST)) {
@@ -850,21 +877,26 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
*(hp->h_addr_list), sizeof(in_addr_t));
else
goto err2;
} else if(node) {
af = ((struct sockaddr_in *) &space->sockaddr_space)->sin_family;
}
if(service) mygetservbyname_r(service, NULL, &se_buf, buf, sizeof(buf), &se);
port = se ? se->s_port : htons(atoi(service ? service : "0"));
((struct sockaddr_in *) &space->sockaddr_space)->sin_port = port;
if(af == AF_INET)
((struct sockaddr_in *) &space->sockaddr_space)->sin_port = port;
else
((struct sockaddr_in6 *) &space->sockaddr_space)->sin6_port = port;
*res = p = &space->addrinfo_space;
assert((size_t)p == (size_t) space);
p->ai_addr = &space->sockaddr_space;
p->ai_addr = (void*) &space->sockaddr_space;
if(node)
snprintf(space->addr_name, sizeof(space->addr_name), "%s", node);
p->ai_canonname = space->addr_name;
p->ai_next = NULL;
p->ai_family = space->sockaddr_space.sa_family = AF_INET;
p->ai_family = space->sockaddr_space.ss_family = af;
p->ai_addrlen = sizeof(space->sockaddr_space);
if(hints) {