70 lines
1.5 KiB
C++
70 lines
1.5 KiB
C++
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#include <BAN/Bitcast.h>
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#include <arpa/inet.h>
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#include <limits.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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struct hostent* gethostbyname(const char* name)
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{
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static char name_buffer[HOST_NAME_MAX + 1];
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static in_addr_t addr_buffer;
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static in_addr_t* addr_ptrs[2];
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static struct hostent hostent;
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if (strlen(name) > HOST_NAME_MAX)
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return nullptr;
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strcpy(name_buffer, name);
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hostent.h_name = name_buffer;
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hostent.h_aliases = nullptr;
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hostent.h_addrtype = AF_INET;
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hostent.h_length = sizeof(in_addr_t);
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addr_ptrs[0] = &addr_buffer;
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addr_ptrs[1] = nullptr;
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hostent.h_addr_list = reinterpret_cast<char**>(addr_ptrs);
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int socket = -1;
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if (in_addr_t ipv4 = inet_addr(name); ipv4 != (in_addr_t)(-1))
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addr_buffer = ipv4;
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else
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{
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int socket = ::socket(AF_UNIX, SOCK_SEQPACKET, 0);
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if (socket == -1)
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return nullptr;
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sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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strcpy(addr.sun_path, "/tmp/resolver.sock");
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if (connect(socket, (sockaddr*)&addr, sizeof(addr)) == -1)
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goto error_close_socket;
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if (send(socket, name, strlen(name), 0) == -1)
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goto error_close_socket;
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sockaddr_storage storage;
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if (recv(socket, &storage, sizeof(storage), 0) == -1)
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goto error_close_socket;
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close(socket);
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if (storage.ss_family != AF_INET)
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return nullptr;
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addr_buffer = *reinterpret_cast<in_addr_t*>(storage.ss_storage);
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}
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return &hostent;
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error_close_socket:
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close(socket);
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return nullptr;
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}
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