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connect(): handle ipv4-mapped ipv6 addresses
if an ipv4-mapped ipv6 address is detected, the ip is converted into v4 format because it may actually be one of our remote dns ips. it was reported that a program called "maven", when getting handed our fake ips in the remote dns subnet, converts the ip to v6 prior to calling connect(): [proxychains] Strict chain ... 127.0.0.1:1080 ... ::ffff:224.0.0.1:443 <--socket error or timeout! fixes #77
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@ -307,7 +307,10 @@ int close(int fd) {
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errno = EBADF;
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return -1;
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}
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static int is_v4inv6(const struct in6_addr *a) {
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return a->s6_addr32[0] == 0 && a->s6_addr32[1] == 0 &&
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a->s6_addr16[4] == 0 && a->s6_addr16[5] == 0xffff;
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}
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int connect(int sock, const struct sockaddr *addr, unsigned int len) {
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INIT();
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PFUNC();
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@ -334,6 +337,12 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
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p_addr_in6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
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port = !v6 ? ntohs(((struct sockaddr_in *) addr)->sin_port)
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: ntohs(((struct sockaddr_in6 *) addr)->sin6_port);
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struct in_addr v4inv6;
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if(v6 && is_v4inv6(p_addr_in6)) {
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memcpy(&v4inv6.s_addr, &p_addr_in6->s6_addr32[3], 4);
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v6 = dest_ip.is_v6 = 0;
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p_addr_in = &v4inv6;
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}
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// PDEBUG("localnet: %s; ", inet_ntop(AF_INET,&in_addr_localnet, str, sizeof(str)));
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// PDEBUG("netmask: %s; " , inet_ntop(AF_INET, &in_addr_netmask, str, sizeof(str)));
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