Adding upstream version 0.12.1+dfsg.upstream/0.12.1+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 646 insertions, 0 deletions

diff --git a/examples/util.cc b/examples/util.cc
new file mode 100644
index 0000000..f8401d4
--- /dev/null
+++ b/examples/util.cc
@@ -0,0 +1,646 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2017 ngtcp2 contributors
+ * Copyright (c) 2012 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "util.h"
+
+#ifdef HAVE_ARPA_INET_H
+#  include <arpa/inet.h>
+#endif // HAVE_ARPA_INET_H
+#ifdef HAVE_NETINET_IN_H
+#  include <netinet/in.h>
+#endif
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <netdb.h>
+
+#include <cassert>
+#include <cstring>
+#include <chrono>
+#include <array>
+#include <iostream>
+#include <fstream>
+#include <algorithm>
+#include <limits>
+#include <charconv>
+
+#include "template.h"
+
+using namespace std::literals;
+
+namespace ngtcp2 {
+
+namespace util {
+
+namespace {
+constexpr char LOWER_XDIGITS[] = "0123456789abcdef";
+} // namespace
+
+std::string format_hex(uint8_t c) {
+  std::string s;
+  s.resize(2);
+
+  s[0] = LOWER_XDIGITS[c >> 4];
+  s[1] = LOWER_XDIGITS[c & 0xf];
+
+  return s;
+}
+
+std::string format_hex(const uint8_t *s, size_t len) {
+  std::string res;
+  res.resize(len * 2);
+
+  for (size_t i = 0; i < len; ++i) {
+    auto c = s[i];
+
+    res[i * 2] = LOWER_XDIGITS[c >> 4];
+    res[i * 2 + 1] = LOWER_XDIGITS[c & 0x0f];
+  }
+  return res;
+}
+
+std::string format_hex(const std::string_view &s) {
+  return format_hex(reinterpret_cast<const uint8_t *>(s.data()), s.size());
+}
+
+std::string decode_hex(const std::string_view &s) {
+  assert(s.size() % 2 == 0);
+  std::string res(s.size() / 2, '0');
+  auto p = std::begin(res);
+  for (auto it = std::begin(s); it != std::end(s); it += 2) {
+    *p++ = (hex_to_uint(*it) << 4) | hex_to_uint(*(it + 1));
+  }
+  return res;
+}
+
+namespace {
+// format_fraction2 formats |n| as fraction part of integer.  |n| is
+// considered as fraction, and its precision is 3 digits.  The last
+// digit is ignored.  The precision of the resulting fraction is 2
+// digits.
+std::string format_fraction2(uint32_t n) {
+  n /= 10;
+
+  if (n < 10) {
+    return {'.', '0', static_cast<char>('0' + n)};
+  }
+  return {'.', static_cast<char>('0' + n / 10),
+          static_cast<char>('0' + (n % 10))};
+}
+} // namespace
+
+namespace {
+// round2even rounds the last digit of |n| so that the n / 10 becomes
+// even.
+uint64_t round2even(uint64_t n) {
+  if (n % 10 == 5) {
+    if ((n / 10) & 1) {
+      n += 10;
+    }
+  } else {
+    n += 5;
+  }
+  return n;
+}
+} // namespace
+
+std::string format_durationf(uint64_t ns) {
+  static constexpr const std::string_view units[] = {"us"sv, "ms"sv, "s"sv};
+  if (ns < 1000) {
+    return format_uint(ns) + "ns";
+  }
+  auto unit = 0;
+  if (ns < 1000000) {
+    // do nothing
+  } else if (ns < 1000000000) {
+    ns /= 1000;
+    unit = 1;
+  } else {
+    ns /= 1000000;
+    unit = 2;
+  }
+
+  ns = round2even(ns);
+
+  if (ns / 1000 >= 1000 && unit < 2) {
+    ns /= 1000;
+    ++unit;
+  }
+
+  auto res = format_uint(ns / 1000);
+  res += format_fraction2(ns % 1000);
+  res += units[unit];
+
+  return res;
+}
+
+std::mt19937 make_mt19937() {
+  std::random_device rd;
+  return std::mt19937(rd());
+}
+
+ngtcp2_tstamp timestamp(struct ev_loop *loop) {
+  return std::chrono::duration_cast<std::chrono::nanoseconds>(
+             std::chrono::steady_clock::now().time_since_epoch())
+      .count();
+}
+
+bool numeric_host(const char *hostname) {
+  return numeric_host(hostname, AF_INET) || numeric_host(hostname, AF_INET6);
+}
+
+bool numeric_host(const char *hostname, int family) {
+  int rv;
+  std::array<uint8_t, sizeof(struct in6_addr)> dst;
+
+  rv = inet_pton(family, hostname, dst.data());
+
+  return rv == 1;
+}
+
+namespace {
+void hexdump8(FILE *out, const uint8_t *first, const uint8_t *last) {
+  auto stop = std::min(first + 8, last);
+  for (auto k = first; k != stop; ++k) {
+    fprintf(out, "%02x ", *k);
+  }
+  // each byte needs 3 spaces (2 hex value and space)
+  for (; stop != first + 8; ++stop) {
+    fputs("   ", out);
+  }
+  // we have extra space after 8 bytes
+  fputc(' ', out);
+}
+} // namespace
+
+void hexdump(FILE *out, const uint8_t *src, size_t len) {
+  if (len == 0) {
+    return;
+  }
+  size_t buflen = 0;
+  auto repeated = false;
+  std::array<uint8_t, 16> buf{};
+  auto end = src + len;
+  auto i = src;
+  for (;;) {
+    auto nextlen =
+        std::min(static_cast<size_t>(16), static_cast<size_t>(end - i));
+    if (nextlen == buflen &&
+        std::equal(std::begin(buf), std::begin(buf) + buflen, i)) {
+      // as long as adjacent 16 bytes block are the same, we just
+      // print single '*'.
+      if (!repeated) {
+        repeated = true;
+        fputs("*\n", out);
+      }
+      i += nextlen;
+      continue;
+    }
+    repeated = false;
+    fprintf(out, "%08lx", static_cast<unsigned long>(i - src));
+    if (i == end) {
+      fputc('\n', out);
+      break;
+    }
+    fputs("  ", out);
+    hexdump8(out, i, end);
+    hexdump8(out, i + 8, std::max(i + 8, end));
+    fputc('|', out);
+    auto stop = std::min(i + 16, end);
+    buflen = stop - i;
+    auto p = buf.data();
+    for (; i != stop; ++i) {
+      *p++ = *i;
+      if (0x20 <= *i && *i <= 0x7e) {
+        fputc(*i, out);
+      } else {
+        fputc('.', out);
+      }
+    }
+    fputs("|\n", out);
+  }
+}
+
+std::string make_cid_key(const ngtcp2_cid *cid) {
+  return std::string(cid->data, cid->data + cid->datalen);
+}
+
+std::string make_cid_key(const uint8_t *cid, size_t cidlen) {
+  return std::string(cid, cid + cidlen);
+}
+
+std::string straddr(const sockaddr *sa, socklen_t salen) {
+  std::array<char, NI_MAXHOST> host;
+  std::array<char, NI_MAXSERV> port;
+
+  auto rv = getnameinfo(sa, salen, host.data(), host.size(), port.data(),
+                        port.size(), NI_NUMERICHOST | NI_NUMERICSERV);
+  if (rv != 0) {
+    std::cerr << "getnameinfo: " << gai_strerror(rv) << std::endl;
+    return "";
+  }
+  std::string res = "[";
+  res.append(host.data(), strlen(host.data()));
+  res += "]:";
+  res.append(port.data(), strlen(port.data()));
+  return res;
+}
+
+std::string_view strccalgo(ngtcp2_cc_algo cc_algo) {
+  switch (cc_algo) {
+  case NGTCP2_CC_ALGO_RENO:
+    return "reno"sv;
+  case NGTCP2_CC_ALGO_CUBIC:
+    return "cubic"sv;
+  case NGTCP2_CC_ALGO_BBR:
+    return "bbr"sv;
+  case NGTCP2_CC_ALGO_BBR2:
+    return "bbr2"sv;
+  default:
+    assert(0);
+    abort();
+  }
+}
+
+namespace {
+constexpr bool rws(char c) { return c == '\t' || c == ' '; }
+} // namespace
+
+std::optional<std::unordered_map<std::string, std::string>>
+read_mime_types(const std::string_view &filename) {
+  std::ifstream f(filename.data());
+  if (!f) {
+    return {};
+  }
+
+  std::unordered_map<std::string, std::string> dest;
+
+  std::string line;
+  while (std::getline(f, line)) {
+    if (line.empty() || line[0] == '#') {
+      continue;
+    }
+
+    auto p = std::find_if(std::begin(line), std::end(line), rws);
+    if (p == std::begin(line) || p == std::end(line)) {
+      continue;
+    }
+
+    auto media_type = std::string{std::begin(line), p};
+    for (;;) {
+      auto ext = std::find_if_not(p, std::end(line), rws);
+      if (ext == std::end(line)) {
+        break;
+      }
+
+      p = std::find_if(ext, std::end(line), rws);
+      dest.emplace(std::string{ext, p}, media_type);
+    }
+  }
+
+  return dest;
+}
+
+std::string format_duration(ngtcp2_duration n) {
+  if (n >= 3600 * NGTCP2_SECONDS && (n % (3600 * NGTCP2_SECONDS)) == 0) {
+    return format_uint(n / (3600 * NGTCP2_SECONDS)) + 'h';
+  }
+  if (n >= 60 * NGTCP2_SECONDS && (n % (60 * NGTCP2_SECONDS)) == 0) {
+    return format_uint(n / (60 * NGTCP2_SECONDS)) + 'm';
+  }
+  if (n >= NGTCP2_SECONDS && (n % NGTCP2_SECONDS) == 0) {
+    return format_uint(n / NGTCP2_SECONDS) + 's';
+  }
+  if (n >= NGTCP2_MILLISECONDS && (n % NGTCP2_MILLISECONDS) == 0) {
+    return format_uint(n / NGTCP2_MILLISECONDS) + "ms";
+  }
+  if (n >= NGTCP2_MICROSECONDS && (n % NGTCP2_MICROSECONDS) == 0) {
+    return format_uint(n / NGTCP2_MICROSECONDS) + "us";
+  }
+  return format_uint(n) + "ns";
+}
+
+namespace {
+std::optional<std::pair<uint64_t, size_t>>
+parse_uint_internal(const std::string_view &s) {
+  uint64_t res = 0;
+
+  if (s.empty()) {
+    return {};
+  }
+
+  for (size_t i = 0; i < s.size(); ++i) {
+    auto c = s[i];
+    if (c < '0' || '9' < c) {
+      return {{res, i}};
+    }
+
+    auto d = c - '0';
+    if (res > (std::numeric_limits<uint64_t>::max() - d) / 10) {
+      return {};
+    }
+
+    res *= 10;
+    res += d;
+  }
+
+  return {{res, s.size()}};
+}
+} // namespace
+
+std::optional<uint64_t> parse_uint(const std::string_view &s) {
+  auto o = parse_uint_internal(s);
+  if (!o) {
+    return {};
+  }
+  auto [res, idx] = *o;
+  if (idx != s.size()) {
+    return {};
+  }
+  return res;
+}
+
+std::optional<uint64_t> parse_uint_iec(const std::string_view &s) {
+  auto o = parse_uint_internal(s);
+  if (!o) {
+    return {};
+  }
+  auto [res, idx] = *o;
+  if (idx == s.size()) {
+    return res;
+  }
+  if (idx + 1 != s.size()) {
+    return {};
+  }
+
+  uint64_t m;
+  switch (s[idx]) {
+  case 'G':
+  case 'g':
+    m = 1 << 30;
+    break;
+  case 'M':
+  case 'm':
+    m = 1 << 20;
+    break;
+  case 'K':
+  case 'k':
+    m = 1 << 10;
+    break;
+  default:
+    return {};
+  }
+
+  if (res > std::numeric_limits<uint64_t>::max() / m) {
+    return {};
+  }
+
+  return res * m;
+}
+
+std::optional<uint64_t> parse_duration(const std::string_view &s) {
+  auto o = parse_uint_internal(s);
+  if (!o) {
+    return {};
+  }
+  auto [res, idx] = *o;
+  if (idx == s.size()) {
+    return res * NGTCP2_SECONDS;
+  }
+
+  uint64_t m;
+  if (idx + 1 == s.size()) {
+    switch (s[idx]) {
+    case 'H':
+    case 'h':
+      m = 3600 * NGTCP2_SECONDS;
+      break;
+    case 'M':
+    case 'm':
+      m = 60 * NGTCP2_SECONDS;
+      break;
+    case 'S':
+    case 's':
+      m = NGTCP2_SECONDS;
+      break;
+    default:
+      return {};
+    }
+  } else if (idx + 2 == s.size() && (s[idx + 1] == 's' || s[idx + 1] == 'S')) {
+    switch (s[idx]) {
+    case 'M':
+    case 'm':
+      m = NGTCP2_MILLISECONDS;
+      break;
+    case 'U':
+    case 'u':
+      m = NGTCP2_MICROSECONDS;
+      break;
+    case 'N':
+    case 'n':
+      return res;
+    default:
+      return {};
+    }
+  } else {
+    return {};
+  }
+
+  if (res > std::numeric_limits<uint64_t>::max() / m) {
+    return {};
+  }
+
+  return res * m;
+}
+
+namespace {
+template <typename InputIt> InputIt eat_file(InputIt first, InputIt last) {
+  if (first == last) {
+    *first++ = '/';
+    return first;
+  }
+
+  if (*(last - 1) == '/') {
+    return last;
+  }
+
+  auto p = last;
+  for (; p != first && *(p - 1) != '/'; --p)
+    ;
+  if (p == first) {
+    // this should not happened in normal case, where we expect path
+    // starts with '/'
+    *first++ = '/';
+    return first;
+  }
+
+  return p;
+}
+} // namespace
+
+namespace {
+template <typename InputIt> InputIt eat_dir(InputIt first, InputIt last) {
+  auto p = eat_file(first, last);
+
+  --p;
+
+  assert(*p == '/');
+
+  return eat_file(first, p);
+}
+} // namespace
+
+std::string normalize_path(const std::string_view &path) {
+  assert(path.size() <= 1024);
+  assert(path.size() > 0);
+  assert(path[0] == '/');
+
+  std::array<char, 1024> res;
+  auto p = res.data();
+
+  auto first = std::begin(path);
+  auto last = std::end(path);
+
+  *p++ = '/';
+  ++first;
+  for (; first != last && *first == '/'; ++first)
+    ;
+
+  for (; first != last;) {
+    if (*first == '.') {
+      if (first + 1 == last) {
+        break;
+      }
+      if (*(first + 1) == '/') {
+        first += 2;
+        continue;
+      }
+      if (*(first + 1) == '.') {
+        if (first + 2 == last) {
+          p = eat_dir(res.data(), p);
+          break;
+        }
+        if (*(first + 2) == '/') {
+          p = eat_dir(res.data(), p);
+          first += 3;
+          continue;
+        }
+      }
+    }
+    if (*(p - 1) != '/') {
+      p = eat_file(res.data(), p);
+    }
+    auto slash = std::find(first, last, '/');
+    if (slash == last) {
+      p = std::copy(first, last, p);
+      break;
+    }
+    p = std::copy(first, slash + 1, p);
+    first = slash + 1;
+    for (; first != last && *first == '/'; ++first)
+      ;
+  }
+  return std::string{res.data(), p};
+}
+
+int make_socket_nonblocking(int fd) {
+  int rv;
+  int flags;
+
+  while ((flags = fcntl(fd, F_GETFL, 0)) == -1 && errno == EINTR)
+    ;
+  if (flags == -1) {
+    return -1;
+  }
+
+  while ((rv = fcntl(fd, F_SETFL, flags | O_NONBLOCK)) == -1 && errno == EINTR)
+    ;
+
+  return rv;
+}
+
+int create_nonblock_socket(int domain, int type, int protocol) {
+#ifdef SOCK_NONBLOCK
+  auto fd = socket(domain, type | SOCK_NONBLOCK, protocol);
+  if (fd == -1) {
+    return -1;
+  }
+#else  // !SOCK_NONBLOCK
+  auto fd = socket(domain, type, protocol);
+  if (fd == -1) {
+    return -1;
+  }
+
+  make_socket_nonblocking(fd);
+#endif // !SOCK_NONBLOCK
+
+  return fd;
+}
+
+std::vector<std::string_view> split_str(const std::string_view &s, char delim) {
+  size_t len = 1;
+  auto last = std::end(s);
+  std::string_view::const_iterator d;
+  for (auto first = std::begin(s); (d = std::find(first, last, delim)) != last;
+       ++len, first = d + 1)
+    ;
+
+  auto list = std::vector<std::string_view>(len);
+
+  len = 0;
+  for (auto first = std::begin(s);; ++len) {
+    auto stop = std::find(first, last, delim);
+    // xcode clang does not understand std::string_view{first, stop}.
+    list[len] = std::string_view{first, static_cast<size_t>(stop - first)};
+    if (stop == last) {
+      break;
+    }
+    first = stop + 1;
+  }
+  return list;
+}
+
+std::optional<uint32_t> parse_version(const std::string_view &s) {
+  auto k = s;
+  if (!util::istarts_with(k, "0x"sv)) {
+    return {};
+  }
+  k = k.substr(2);
+  uint32_t v;
+  auto rv = std::from_chars(k.data(), k.data() + k.size(), v, 16);
+  if (rv.ptr != k.data() + k.size() || rv.ec != std::errc{}) {
+    return {};
+  }
+
+  return v;
+}
+
+} // namespace util
+
+std::ostream &operator<<(std::ostream &os, const ngtcp2_cid &cid) {
+  return os << "0x" << util::format_hex(cid.data, cid.datalen);
+}
+
+} // namespace ngtcp2