diff options
Diffstat (limited to 'netwerk/dns/DNS.cpp')
| -rw-r--r-- | netwerk/dns/DNS.cpp | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/netwerk/dns/DNS.cpp b/netwerk/dns/DNS.cpp new file mode 100644 index 000000000..643296af0 --- /dev/null +++ b/netwerk/dns/DNS.cpp @@ -0,0 +1,368 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/net/DNS.h" + +#include "mozilla/Assertions.h" +#include "mozilla/mozalloc.h" +#include "mozilla/ArrayUtils.h" +#include <string.h> + +#ifdef XP_WIN +#include "ws2tcpip.h" +#endif + +namespace mozilla { +namespace net { + +const char *inet_ntop_internal(int af, const void *src, char *dst, socklen_t size) +{ +#ifdef XP_WIN + if (af == AF_INET) { + struct sockaddr_in s; + memset(&s, 0, sizeof(s)); + s.sin_family = AF_INET; + memcpy(&s.sin_addr, src, sizeof(struct in_addr)); + int result = getnameinfo((struct sockaddr *)&s, sizeof(struct sockaddr_in), + dst, size, nullptr, 0, NI_NUMERICHOST); + if (result == 0) { + return dst; + } + } + else if (af == AF_INET6) { + struct sockaddr_in6 s; + memset(&s, 0, sizeof(s)); + s.sin6_family = AF_INET6; + memcpy(&s.sin6_addr, src, sizeof(struct in_addr6)); + int result = getnameinfo((struct sockaddr *)&s, sizeof(struct sockaddr_in6), + dst, size, nullptr, 0, NI_NUMERICHOST); + if (result == 0) { + return dst; + } + } + return nullptr; +#else + return inet_ntop(af, src, dst, size); +#endif +} + +// Copies the contents of a PRNetAddr to a NetAddr. +// Does not do a ptr safety check! +void PRNetAddrToNetAddr(const PRNetAddr *prAddr, NetAddr *addr) +{ + if (prAddr->raw.family == PR_AF_INET) { + addr->inet.family = AF_INET; + addr->inet.port = prAddr->inet.port; + addr->inet.ip = prAddr->inet.ip; + } + else if (prAddr->raw.family == PR_AF_INET6) { + addr->inet6.family = AF_INET6; + addr->inet6.port = prAddr->ipv6.port; + addr->inet6.flowinfo = prAddr->ipv6.flowinfo; + memcpy(&addr->inet6.ip, &prAddr->ipv6.ip, sizeof(addr->inet6.ip.u8)); + addr->inet6.scope_id = prAddr->ipv6.scope_id; + } +#if defined(XP_UNIX) + else if (prAddr->raw.family == PR_AF_LOCAL) { + addr->local.family = AF_LOCAL; + memcpy(addr->local.path, prAddr->local.path, sizeof(addr->local.path)); + } +#endif +} + +// Copies the contents of a NetAddr to a PRNetAddr. +// Does not do a ptr safety check! +void NetAddrToPRNetAddr(const NetAddr *addr, PRNetAddr *prAddr) +{ + if (addr->raw.family == AF_INET) { + prAddr->inet.family = PR_AF_INET; + prAddr->inet.port = addr->inet.port; + prAddr->inet.ip = addr->inet.ip; + } + else if (addr->raw.family == AF_INET6) { + prAddr->ipv6.family = PR_AF_INET6; + prAddr->ipv6.port = addr->inet6.port; + prAddr->ipv6.flowinfo = addr->inet6.flowinfo; + memcpy(&prAddr->ipv6.ip, &addr->inet6.ip, sizeof(addr->inet6.ip.u8)); + prAddr->ipv6.scope_id = addr->inet6.scope_id; + } +#if defined(XP_UNIX) + else if (addr->raw.family == AF_LOCAL) { + prAddr->local.family = PR_AF_LOCAL; + memcpy(prAddr->local.path, addr->local.path, sizeof(addr->local.path)); + } +#elif defined(XP_WIN) + else if (addr->raw.family == AF_LOCAL) { + prAddr->local.family = PR_AF_LOCAL; + memcpy(prAddr->local.path, addr->local.path, sizeof(addr->local.path)); + } +#endif +} + +bool NetAddrToString(const NetAddr *addr, char *buf, uint32_t bufSize) +{ + if (addr->raw.family == AF_INET) { + if (bufSize < INET_ADDRSTRLEN) { + return false; + } + struct in_addr nativeAddr = {}; + nativeAddr.s_addr = addr->inet.ip; + return !!inet_ntop_internal(AF_INET, &nativeAddr, buf, bufSize); + } + else if (addr->raw.family == AF_INET6) { + if (bufSize < INET6_ADDRSTRLEN) { + return false; + } + struct in6_addr nativeAddr = {}; + memcpy(&nativeAddr.s6_addr, &addr->inet6.ip, sizeof(addr->inet6.ip.u8)); + return !!inet_ntop_internal(AF_INET6, &nativeAddr, buf, bufSize); + } +#if defined(XP_UNIX) + else if (addr->raw.family == AF_LOCAL) { + if (bufSize < sizeof(addr->local.path)) { + // Many callers don't bother checking our return value, so + // null-terminate just in case. + if (bufSize > 0) { + buf[0] = '\0'; + } + return false; + } + + // Usually, the size passed to memcpy should be the size of the + // destination. Here, we know that the source is no larger than the + // destination, so using the source's size is always safe, whereas + // using the destination's size may cause us to read off the end of the + // source. + memcpy(buf, addr->local.path, sizeof(addr->local.path)); + return true; + } +#endif + return false; +} + +bool IsLoopBackAddress(const NetAddr *addr) +{ + if (addr->raw.family == AF_INET) { + return (addr->inet.ip == htonl(INADDR_LOOPBACK)); + } + else if (addr->raw.family == AF_INET6) { + if (IPv6ADDR_IS_LOOPBACK(&addr->inet6.ip)) { + return true; + } else if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) && + IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) == htonl(INADDR_LOOPBACK)) { + return true; + } + } + return false; +} + +bool IsIPAddrAny(const NetAddr *addr) +{ + if (addr->raw.family == AF_INET) { + if (addr->inet.ip == htonl(INADDR_ANY)) { + return true; + } + } + else if (addr->raw.family == AF_INET6) { + if (IPv6ADDR_IS_UNSPECIFIED(&addr->inet6.ip)) { + return true; + } else if (IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip) && + IPv6ADDR_V4MAPPED_TO_IPADDR(&addr->inet6.ip) == htonl(INADDR_ANY)) { + return true; + } + } + return false; +} + +bool IsIPAddrV4Mapped(const NetAddr *addr) +{ + if (addr->raw.family == AF_INET6) { + return IPv6ADDR_IS_V4MAPPED(&addr->inet6.ip); + } + return false; +} + +bool IsIPAddrLocal(const NetAddr *addr) +{ + MOZ_ASSERT(addr); + + // IPv4 RFC1918 and Link Local Addresses. + if (addr->raw.family == AF_INET) { + uint32_t addr32 = ntohl(addr->inet.ip); + if (addr32 >> 24 == 0x0A || // 10/8 prefix (RFC 1918). + addr32 >> 20 == 0xAC1 || // 172.16/12 prefix (RFC 1918). + addr32 >> 16 == 0xC0A8 || // 192.168/16 prefix (RFC 1918). + addr32 >> 16 == 0xA9FE) { // 169.254/16 prefix (Link Local). + return true; + } + } + // IPv6 Unique and Link Local Addresses. + if (addr->raw.family == AF_INET6) { + uint16_t addr16 = ntohs(addr->inet6.ip.u16[0]); + if (addr16 >> 9 == 0xfc >> 1 || // fc00::/7 Unique Local Address. + addr16 >> 6 == 0xfe80 >> 6) { // fe80::/10 Link Local Address. + return true; + } + } + // Not an IPv4/6 local address. + return false; +} + +nsresult +GetPort(const NetAddr *aAddr, uint16_t *aResult) +{ + uint16_t port; + if (aAddr->raw.family == PR_AF_INET) { + port = aAddr->inet.port; + } else if (aAddr->raw.family == PR_AF_INET6) { + port = aAddr->inet6.port; + } else { + return NS_ERROR_NOT_INITIALIZED; + } + + *aResult = ntohs(port); + return NS_OK; +} + +bool +NetAddr::operator == (const NetAddr& other) const +{ + if (this->raw.family != other.raw.family) { + return false; + } else if (this->raw.family == AF_INET) { + return (this->inet.port == other.inet.port) && + (this->inet.ip == other.inet.ip); + } else if (this->raw.family == AF_INET6) { + return (this->inet6.port == other.inet6.port) && + (this->inet6.flowinfo == other.inet6.flowinfo) && + (memcmp(&this->inet6.ip, &other.inet6.ip, + sizeof(this->inet6.ip)) == 0) && + (this->inet6.scope_id == other.inet6.scope_id); +#if defined(XP_UNIX) + } else if (this->raw.family == AF_LOCAL) { + return PL_strncmp(this->local.path, other.local.path, + ArrayLength(this->local.path)); +#endif + } + return false; +} + +bool +NetAddr::operator < (const NetAddr& other) const +{ + if (this->raw.family != other.raw.family) { + return this->raw.family < other.raw.family; + } else if (this->raw.family == AF_INET) { + if (this->inet.ip == other.inet.ip) { + return this->inet.port < other.inet.port; + } else { + return this->inet.ip < other.inet.ip; + } + } else if (this->raw.family == AF_INET6) { + int cmpResult = memcmp(&this->inet6.ip, &other.inet6.ip, + sizeof(this->inet6.ip)); + if (cmpResult) { + return cmpResult < 0; + } else if (this->inet6.port != other.inet6.port) { + return this->inet6.port < other.inet6.port; + } else { + return this->inet6.flowinfo < other.inet6.flowinfo; + } + } + return false; +} + +NetAddrElement::NetAddrElement(const PRNetAddr *prNetAddr) +{ + PRNetAddrToNetAddr(prNetAddr, &mAddress); +} + +NetAddrElement::NetAddrElement(const NetAddrElement& netAddr) +{ + mAddress = netAddr.mAddress; +} + +NetAddrElement::~NetAddrElement() = default; + +AddrInfo::AddrInfo(const char *host, const PRAddrInfo *prAddrInfo, + bool disableIPv4, bool filterNameCollision, const char *cname) + : mHostName(nullptr) + , mCanonicalName(nullptr) + , ttl(NO_TTL_DATA) +{ + MOZ_ASSERT(prAddrInfo, "Cannot construct AddrInfo with a null prAddrInfo pointer!"); + const uint32_t nameCollisionAddr = htonl(0x7f003535); // 127.0.53.53 + + Init(host, cname); + PRNetAddr tmpAddr; + void *iter = nullptr; + do { + iter = PR_EnumerateAddrInfo(iter, prAddrInfo, 0, &tmpAddr); + bool addIt = iter && + (!disableIPv4 || tmpAddr.raw.family != PR_AF_INET) && + (!filterNameCollision || tmpAddr.raw.family != PR_AF_INET || (tmpAddr.inet.ip != nameCollisionAddr)); + if (addIt) { + auto *addrElement = new NetAddrElement(&tmpAddr); + mAddresses.insertBack(addrElement); + } + } while (iter); +} + +AddrInfo::AddrInfo(const char *host, const char *cname) + : mHostName(nullptr) + , mCanonicalName(nullptr) + , ttl(NO_TTL_DATA) +{ + Init(host, cname); +} + +AddrInfo::~AddrInfo() +{ + NetAddrElement *addrElement; + while ((addrElement = mAddresses.popLast())) { + delete addrElement; + } + free(mHostName); + free(mCanonicalName); +} + +void +AddrInfo::Init(const char *host, const char *cname) +{ + MOZ_ASSERT(host, "Cannot initialize AddrInfo with a null host pointer!"); + + ttl = NO_TTL_DATA; + size_t hostlen = strlen(host); + mHostName = static_cast<char*>(moz_xmalloc(hostlen + 1)); + memcpy(mHostName, host, hostlen + 1); + if (cname) { + size_t cnameLen = strlen(cname); + mCanonicalName = static_cast<char*>(moz_xmalloc(cnameLen + 1)); + memcpy(mCanonicalName, cname, cnameLen + 1); + } + else { + mCanonicalName = nullptr; + } +} + +void +AddrInfo::AddAddress(NetAddrElement *address) +{ + MOZ_ASSERT(address, "Cannot add the address to an uninitialized list"); + + mAddresses.insertBack(address); +} + +size_t +AddrInfo::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const +{ + size_t n = mallocSizeOf(this); + n += mallocSizeOf(mHostName); + n += mallocSizeOf(mCanonicalName); + n += mAddresses.sizeOfExcludingThis(mallocSizeOf); + return n; +} + +} // namespace net +} // namespace mozilla |