/* Copyright (c) 2012-2018, Arvid Norberg All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "libtorrent/config.hpp" #include "libtorrent/string_util.hpp" #include "libtorrent/random.hpp" #include "libtorrent/error_code.hpp" #include "libtorrent/parse_url.hpp" #include "libtorrent/address.hpp" #include "libtorrent/assert.hpp" #include // for malloc #include // for strlen #include // for search namespace libtorrent { // We need well defined results that don't depend on locale std::array::digits10> to_string(std::int64_t const n) { std::array::digits10> ret; char *p = &ret.back(); *p = '\0'; // we want "un" to be the absolute value // since the absolute of INT64_MIN cannot be represented by a signed // int64, we calculate the abs in unsigned space std::uint64_t un = n < 0 ? std::numeric_limits::max() - std::uint64_t(n) + 1 : std::uint64_t(n); do { *--p = '0' + un % 10; un /= 10; } while (un); if (n < 0) *--p = '-'; std::memmove(ret.data(), p, std::size_t(&ret.back() - p + 1)); return ret; } bool is_alpha(char c) { return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); } bool is_print(char c) { return c >= 32 && c < 127; } bool is_space(char c) { return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v'; } char to_lower(char c) { return (c >= 'A' && c <= 'Z') ? c - 'A' + 'a' : c; } bool string_begins_no_case(char const* s1, char const* s2) { TORRENT_ASSERT(s1 != nullptr); TORRENT_ASSERT(s2 != nullptr); while (*s1 != 0) { if (to_lower(*s1) != to_lower(*s2)) return false; ++s1; ++s2; } return true; } bool string_equal_no_case(string_view s1, string_view s2) { if (s1.size() != s2.size()) return false; return std::equal(s1.begin(), s1.end(), s2.begin() , [] (char const c1, char const c2) { return to_lower(c1) == to_lower(c2); }); } // generate a url-safe random string void url_random(span dest) { // http-accepted characters: // excluding ', since some buggy trackers don't support that static char const printable[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz-_.!~*()"; // the random number std::generate(dest.begin(), dest.end() , []{ return printable[random(sizeof(printable) - 2)]; }); } bool string_ends_with(string_view s1, string_view s2) { return s1.size() >= s2.size() && std::equal(s2.rbegin(), s2.rend(), s1.rbegin()); } int search(span src, span target) { TORRENT_ASSERT(!src.empty()); TORRENT_ASSERT(!target.empty()); TORRENT_ASSERT(target.size() >= src.size()); TORRENT_ASSERT(target.size() < std::numeric_limits::max()); auto const it = std::search(target.begin(), target.end(), src.begin(), src.end()); // no complete sync if (it == target.end()) return -1; return static_cast(it - target.begin()); } char* allocate_string_copy(string_view str) { if (str.empty()) return nullptr; auto* tmp = new char[str.size() + 1]; std::copy(str.data(), str.data() + str.size(), tmp); tmp[str.size()] = '\0'; return tmp; } #if TORRENT_ABI_VERSION == 1 \ || !defined TORRENT_DISABLE_LOGGING std::string print_listen_interfaces(std::vector const& in) { std::string ret; for (auto const& i : in) { if (!ret.empty()) ret += ','; error_code ec; make_address_v6(i.device, ec); if (!ec) { // IPv6 addresses must be wrapped in square brackets ret += '['; ret += i.device; ret += ']'; } else { ret += i.device; } ret += ':'; ret += to_string(i.port).data(); if (i.ssl) ret += 's'; if (i.local) ret += 'l'; } return ret; } #endif string_view strip_string(string_view in) { while (!in.empty() && is_space(in.front())) in.remove_prefix(1); while (!in.empty() && is_space(in.back())) in.remove_suffix(1); return in; } // this parses the string that's used as the listen_interfaces setting. // it is a comma-separated list of IP or device names with ports. For // example: "eth0:6881,eth1:6881" or "127.0.0.1:6881" std::vector parse_listen_interfaces(std::string const& in , std::vector& err) { std::vector out; string_view rest = in; while (!rest.empty()) { string_view element; std::tie(element, rest) = split_string(rest, ','); element = strip_string(element); if (element.size() > 1 && element.front() == '"' && element.back() == '"') element = element.substr(1, element.size() - 2); if (element.empty()) continue; listen_interface_t iface; iface.ssl = false; iface.local = false; string_view port; if (element.front() == '[') { auto const pos = find_first_of(element, ']', 0); if (pos == string_view::npos || pos+1 >= element.size() || element[pos+1] != ':') { err.emplace_back(element); continue; } iface.device = strip_string(element.substr(1, pos - 1)).to_string(); port = strip_string(element.substr(pos + 2)); } else { // consume device name auto const pos = find_first_of(element, ':', 0); iface.device = strip_string(element.substr(0, pos)).to_string(); if (pos == string_view::npos) { err.emplace_back(element); continue; } port = strip_string(element.substr(pos + 1)); } // consume port std::string port_str; for (std::size_t i = 0; i < port.size() && is_digit(port[i]); ++i) port_str += port[i]; if (port_str.empty() || port_str.size() > 5) { err.emplace_back(element); continue; } iface.port = std::atoi(port_str.c_str()); if (iface.port < 0 || iface.port > 65535) { err.emplace_back(element); continue; } port.remove_prefix(port_str.size()); port = strip_string(port); // consume potential SSL 's' for (auto const c : port) { switch (c) { case 's': iface.ssl = true; break; case 'l': iface.local = true; break; } } TORRENT_ASSERT(iface.port >= 0); out.emplace_back(iface); } return out; } // this parses the string that's used as the dht_bootstrap setting. // it is a comma-separated list of IP or hostnames with ports. For // example: "router.bittorrent.com:6881,router.utorrent.com:6881" or "127.0.0.1:6881" void parse_comma_separated_string_port(std::string const& in , std::vector>& out) { out.clear(); std::string::size_type start = 0; std::string::size_type end = 0; while (start < in.size()) { // skip leading spaces while (start < in.size() && is_space(in[start])) ++start; end = in.find_first_of(',', start); if (end == std::string::npos) end = in.size(); std::string::size_type colon = in.find_last_of(':', end); if (colon != std::string::npos && colon > start) { int port = std::atoi(in.substr(colon + 1, end - colon - 1).c_str()); // skip trailing spaces std::string::size_type soft_end = colon; while (soft_end > start && is_space(in[soft_end-1])) --soft_end; // in case this is an IPv6 address, strip off the square brackets // to make it more easily parseable into an ip::address if (in[start] == '[') ++start; if (soft_end > start && in[soft_end-1] == ']') --soft_end; out.emplace_back(in.substr(start, soft_end - start), port); } start = end + 1; } } void parse_comma_separated_string(std::string const& in, std::vector& out) { out.clear(); std::string::size_type start = 0; std::string::size_type end = 0; while (start < in.size()) { // skip leading spaces while (start < in.size() && is_space(in[start])) ++start; end = in.find_first_of(',', start); if (end == std::string::npos) end = in.size(); // skip trailing spaces std::string::size_type soft_end = end; while (soft_end > start && is_space(in[soft_end - 1])) --soft_end; out.push_back(in.substr(start, soft_end - start)); start = end + 1; } } std::pair split_string(string_view last, char const sep) { if (last.empty()) return {{}, {}}; std::size_t pos = 0; if (last[0] == '"' && sep != '"') { for (auto const c : last.substr(1)) { ++pos; if (c == '"') break; } } std::size_t found_sep = 0; for (char const c : last.substr(pos)) { if (c == sep) { found_sep = 1; break; } ++pos; } return {last.substr(0, pos), last.substr(pos + found_sep)}; } #if TORRENT_USE_I2P bool is_i2p_url(std::string const& url) { using std::ignore; std::string hostname; error_code ec; std::tie(ignore, ignore, hostname, ignore, ignore) = parse_url_components(url, ec); return string_ends_with(hostname, ".i2p"); } #endif }