From f5e48e94a2f4d4bbd6e5628c7f2afafc6dbcc459 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Thu, 7 Mar 2024 17:28:52 -0500 Subject: build: Build mlibc + add distclean target Signed-off-by: Ian Moffett --- lib/mlibc/options/posix/generic/lookup.cpp | 512 ----------------------------- 1 file changed, 512 deletions(-) delete mode 100644 lib/mlibc/options/posix/generic/lookup.cpp (limited to 'lib/mlibc/options/posix/generic/lookup.cpp') diff --git a/lib/mlibc/options/posix/generic/lookup.cpp b/lib/mlibc/options/posix/generic/lookup.cpp deleted file mode 100644 index f877fe5..0000000 --- a/lib/mlibc/options/posix/generic/lookup.cpp +++ /dev/null @@ -1,512 +0,0 @@ -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include - -namespace mlibc { - -namespace { - constexpr unsigned int RECORD_A = 1; - constexpr unsigned int RECORD_CNAME = 5; - constexpr unsigned int RECORD_PTR = 12; -} - -static frg::string read_dns_name(char *buf, char *&it) { - frg::string res{getAllocator()}; - while (true) { - char code = *it++; - if ((code & 0xC0) == 0xC0) { - // pointer - uint8_t offset = ((code & 0x3F) << 8) | *it++; - auto offset_it = buf + offset; - return res + read_dns_name(buf, offset_it); - } else if (!(code & 0xC0)) { - if (!code) - break; - - for (int i = 0; i < code; i++) - res += (*it++); - - if (*it) - res += '.'; - } else { - break; - } - } - - return res; -} - -int lookup_name_dns(struct lookup_result &buf, const char *name, - frg::string &canon_name) { - frg::string request{getAllocator()}; - - int num_q = 1; - struct dns_header header; - header.identification = htons(123); - header.flags = htons(0x100); - header.no_q = htons(num_q); - header.no_ans = htons(0); - header.no_auths = htons(0); - header.no_additional = htons(0); - - request.resize(sizeof(header)); - memcpy(request.data(), &header, sizeof(header)); - - const char *end = name; - while (*end != '\0') { - end = strchrnul(name, '.'); - size_t length = end - name; - frg::string_view substring{name, length}; - name += length + 1; - request += char(length); - request += substring; - } - - request += char(0); - // set question type to fetch A records - request += 0; - request += 1; - // set CLASS to IN - request += 0; - request += 1; - - struct sockaddr_in sin = {}; - sin.sin_family = AF_INET; - // TODO(geert): we could probably make this use the service lookup - // for dns - sin.sin_port = htons(53); - - auto nameserver = get_nameserver(); - if (!inet_aton(nameserver ? nameserver->name.data() : "127.0.0.1", &sin.sin_addr)) { - mlibc::infoLogger() << "lookup_name_dns(): inet_aton() failed!" << frg::endlog; - return -EAI_SYSTEM; - } - - int fd = socket(AF_INET, SOCK_DGRAM, 0); - if (fd < 0) { - mlibc::infoLogger() << "lookup_name_dns(): socket() failed" << frg::endlog; - return -EAI_SYSTEM; - } - - size_t sent = sendto(fd, request.data(), request.size(), 0, - (struct sockaddr*)&sin, sizeof(sin)); - if (sent != request.size()) { - mlibc::infoLogger() << "lookup_name_dns(): sendto() failed to send everything" << frg::endlog; - return -EAI_SYSTEM; - } - - char response[256]; - ssize_t rlen; - int num_ans = 0; - while ((rlen = recvfrom(fd, response, 256, 0, NULL, NULL)) >= 0) { - if ((size_t)rlen < sizeof(struct dns_header)) - continue; - auto response_header = reinterpret_cast(response); - if (response_header->identification != header.identification) - return -EAI_FAIL; - - auto it = response + sizeof(struct dns_header); - for (int i = 0; i < ntohs(response_header->no_q); i++) { - auto dns_name = read_dns_name(response, it); - (void) dns_name; - it += 4; - } - - for (int i = 0; i < ntohs(response_header->no_ans); i++) { - struct dns_addr_buf buffer; - auto dns_name = read_dns_name(response, it); - - uint16_t rr_type = (it[0] << 8) | it[1]; - uint16_t rr_class = (it[2] << 8) | it[3]; - uint16_t rr_length = (it[8] << 8) | it[9]; - it += 10; - (void)rr_class; - - switch (rr_type) { - case RECORD_A: - memcpy(buffer.addr, it, rr_length); - it += rr_length; - buffer.family = AF_INET; - buffer.name = std::move(dns_name); - buf.buf.push(std::move(buffer)); - break; - case RECORD_CNAME: - canon_name = read_dns_name(response, it); - buf.aliases.push(std::move(dns_name)); - break; - default: - mlibc::infoLogger() << "lookup_name_dns: unknown rr type " - << rr_type << frg::endlog; - break; - } - } - num_ans += ntohs(response_header->no_ans); - - if (num_ans >= num_q) - break; - } - - close(fd); - return buf.buf.size(); -} - -int lookup_addr_dns(frg::span name, frg::array &addr, int family) { - frg::string request{getAllocator()}; - - int num_q = 1; - struct dns_header header; - header.identification = htons(123); - header.flags = htons(0x100); - header.no_q = htons(num_q); - header.no_ans = htons(0); - header.no_auths = htons(0); - header.no_additional = htons(0); - - request.resize(sizeof(header)); - memcpy(request.data(), &header, sizeof(header)); - - char addr_str[64]; - if(!inet_ntop(family, addr.data(), addr_str, sizeof(addr_str))) { - switch(errno) { - case EAFNOSUPPORT: - return -EAI_FAMILY; - case ENOSPC: - return -EAI_OVERFLOW; - default: - return -EAI_FAIL; - } - } - frg::string req_str{getAllocator(), addr_str}; - req_str += ".in-addr.arpa"; - - frg::string_view req_view{req_str.data(), req_str.size()}; - size_t ptr = 0; - do { - size_t next = req_view.find_first('.', ptr); - size_t length = next != (size_t)-1 ? next - ptr : req_view.size() - ptr; - frg::string_view substring = req_view.sub_string(ptr, length); - request += char(length); - request += substring; - ptr = next + 1; - } while(ptr != 0); - - request += char(0); - // set question type to fetch PTR records - request += 0; - request += 12; - // set CLASS to IN - request += 0; - request += 1; - - - struct sockaddr_in sin = {}; - sin.sin_family = AF_INET; - // TODO(geert): we could probably make this use the service lookup - // for dns - sin.sin_port = htons(53); - - auto nameserver = get_nameserver(); - if (!inet_aton(nameserver ? nameserver->name.data() : "127.0.0.1", &sin.sin_addr)) { - mlibc::infoLogger() << "lookup_name_dns(): inet_aton() failed!" << frg::endlog; - return -EAI_SYSTEM; - } - - int fd = socket(AF_INET, SOCK_DGRAM, 0); - if (fd < 0) { - mlibc::infoLogger() << "lookup_name_dns(): socket() failed" << frg::endlog; - return -EAI_SYSTEM; - } - - size_t sent = sendto(fd, request.data(), request.size(), 0, - (struct sockaddr*)&sin, sizeof(sin)); - if (sent != request.size()) { - mlibc::infoLogger() << "lookup_name_dns(): sendto() failed to send everything" << frg::endlog; - return -EAI_SYSTEM; - } - - char response[256]; - ssize_t rlen; - int num_ans = 0; - while ((rlen = recvfrom(fd, response, 256, 0, NULL, NULL)) >= 0) { - if ((size_t)rlen < sizeof(struct dns_header)) - continue; - auto response_header = reinterpret_cast(response); - if (response_header->identification != header.identification) - return -EAI_FAIL; - - auto it = response + sizeof(struct dns_header); - for (int i = 0; i < ntohs(response_header->no_q); i++) { - auto dns_name = read_dns_name(response, it); - (void) dns_name; - it += 4; - } - - for (int i = 0; i < ntohs(response_header->no_ans); i++) { - struct dns_addr_buf buffer; - auto dns_name = read_dns_name(response, it); - - uint16_t rr_type = (it[0] << 8) | it[1]; - uint16_t rr_class = (it[2] << 8) | it[3]; - uint16_t rr_length = (it[8] << 8) | it[9]; - it += 10; - (void)rr_class; - (void)rr_length; - - (void)dns_name; - - switch (rr_type) { - case RECORD_PTR: { - auto ptr_name = read_dns_name(response, it); - if (ptr_name.size() >= name.size()) - return -EAI_OVERFLOW; - std::copy(ptr_name.begin(), ptr_name.end(), name.data()); - name.data()[ptr_name.size()] = '\0'; - return 1; - } - default: - mlibc::infoLogger() << "lookup_addr_dns: unknown rr type " - << rr_type << frg::endlog; - break; - } - num_ans += ntohs(response_header->no_ans); - - if (num_ans >= num_q) - break; - } - } - - close(fd); - return 0; -} - -int lookup_name_hosts(struct lookup_result &buf, const char *name, - frg::string &canon_name) { - auto file = fopen("/etc/hosts", "r"); - if (!file) { - switch (errno) { - case ENOENT: - case ENOTDIR: - case EACCES: - return -EAI_SERVICE; - default: - return -EAI_SYSTEM; - } - } - - char line[128]; - int name_length = strlen(name); - while (fgets(line, 128, file)) { - char *pos; - // same way to deal with comments as in services.cpp - if ((pos = strchr(line, '#'))) { - *pos++ = '\n'; - *pos = '\0'; - } - - for(pos = line + 1; (pos = strstr(pos, name)) && - (!isspace(pos[-1]) || !isspace(pos[name_length])); pos++); - if (!pos) - continue; - - for (pos = line; !isspace(*pos); pos++); - *pos = '\0'; - - // TODO(geert): we assume ipv4 for now - struct in_addr addr; - if (!inet_aton(line, &addr)) - continue; - - pos++; - for(; *pos && isspace(*pos); pos++); - char *end; - for(end = pos; *end && !isspace(*end); end++); - - struct dns_addr_buf buffer; - memcpy(buffer.addr, &addr, 4); - buffer.family = AF_INET; - buffer.name = frg::string{pos, - static_cast(end - pos), getAllocator()}; - canon_name = buffer.name; - - buf.buf.push(std::move(buffer)); - - pos = end; - while (pos[1]) { - for (; *pos && isspace(*pos); pos++); - for (end = pos; *end && !isspace(*end); end++); - auto name = frg::string{pos, - static_cast(end - pos), getAllocator()}; - buf.aliases.push(std::move(name)); - pos = end; - } - } - - fclose(file); - return buf.buf.size(); -} - -int lookup_addr_hosts(frg::span name, frg::array &addr, int family) { - auto file = fopen("/etc/hosts", "r"); - if (!file) { - switch (errno) { - case ENOENT: - case ENOTDIR: - case EACCES: - return -EAI_SERVICE; - default: - return -EAI_SYSTEM; - } - } - - // Buffer to hold ASCII version of address - char addr_str[64]; - if(!inet_ntop(family, addr.data(), addr_str, sizeof(addr_str))) { - switch(errno) { - case EAFNOSUPPORT: - return -EAI_FAMILY; - case ENOSPC: - return -EAI_OVERFLOW; - default: - return -EAI_FAIL; - } - } - int addr_str_len = strlen(addr_str); - - char line[128]; - while (fgets(line, 128, file)) { - char *pos; - // same way to deal with comments as in services.cpp - if ((pos = strchr(line, '#'))) { - *pos++ = '\n'; - *pos = '\0'; - } - if (strncmp(line, addr_str, addr_str_len)) - continue; - - for (pos = line + addr_str_len + 1; isspace(*pos); pos++); - char *begin = pos; - for (; !isspace(*pos); pos++); - char *end = pos; - - size_t size = end - begin; - if (size >= name.size()) - return -EAI_OVERFLOW; - std::copy(begin, end, name.data()); - name.data()[size] = '\0'; - return 1; - } - return 0; -} - -int lookup_name_null(struct lookup_result &buf, int flags, int family) { - if (flags & AI_PASSIVE) { - if (family != AF_INET6) { - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET; - - in_addr_t addr = INADDR_ANY; - memcpy(&addr_buf.addr, &addr, 4); - - buf.buf.push_back(addr_buf); - } - if (family != AF_INET) { - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET6; - - struct in6_addr addr = IN6ADDR_ANY_INIT; - memcpy(&addr_buf.addr, &addr, 16); - - buf.buf.push_back(addr_buf); - } - } else { - if (family != AF_INET6) { - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET; - - in_addr_t addr = INADDR_LOOPBACK; - memcpy(&addr_buf.addr, &addr, 4); - - buf.buf.push_back(addr_buf); - } - if (family != AF_INET) { - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET6; - - struct in6_addr addr = IN6ADDR_LOOPBACK_INIT; - memcpy(&addr_buf.addr, &addr, 16); - - buf.buf.push_back(addr_buf); - } - } - return buf.buf.size(); -} - -int lookup_name_ip(struct lookup_result &buf, const char *name, int family) { - if (family == AF_INET) { - in_addr_t addr = 0; - int res = inet_pton(AF_INET, name, &addr); - - if (res <= 0) - return -EAI_NONAME; - - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET; - memcpy(&addr_buf.addr, &addr, 4); - - buf.buf.push_back(addr_buf); - return 1; - } - - if (family == AF_INET6) { - struct in6_addr addr{0}; - int res = inet_pton(AF_INET6, name, &addr); - - if (res <= 0) - return -EAI_NONAME; - - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET6; - memcpy(&addr_buf.addr, &addr, 16); - - buf.buf.push_back(addr_buf); - return 1; - } - - // If no family was specified we try ipv4 and then ipv6. - in_addr_t addr4 = 0; - int res = inet_pton(AF_INET, name, &addr4); - - if (res > 0) { - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET; - memcpy(&addr_buf.addr, &addr4, 4); - - buf.buf.push_back(addr_buf); - return 1; - } - - struct in6_addr addr6{0}; - res = inet_pton(AF_INET6, name, &addr6); - - if (res <= 0) - return -EAI_NONAME; - - struct dns_addr_buf addr_buf; - addr_buf.family = AF_INET6; - memcpy(&addr_buf.addr, &addr6, 16); - - buf.buf.push_back(addr_buf); - return 1; -} - -} // namespace mlibc -- cgit v1.2.3