. /include/boost/corosio /native /detail /endpoint_convert.hpp
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1   // 1   //
2   // Copyright (c) 2026 Vinnie Falco (vinnie.falco@gmail.com) 2   // Copyright (c) 2026 Vinnie Falco (vinnie.falco@gmail.com)
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 4   // Distributed under the Boost Software License, Version 1.0. (See accompanying
5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/cppalliance/corosio 7   // Official repository: https://github.com/cppalliance/corosio
8   // 8   //
9   9  
10   #ifndef BOOST_COROSIO_NATIVE_DETAIL_ENDPOINT_CONVERT_HPP 10   #ifndef BOOST_COROSIO_NATIVE_DETAIL_ENDPOINT_CONVERT_HPP
11   #define BOOST_COROSIO_NATIVE_DETAIL_ENDPOINT_CONVERT_HPP 11   #define BOOST_COROSIO_NATIVE_DETAIL_ENDPOINT_CONVERT_HPP
12   12  
13   #include <boost/corosio/endpoint.hpp> 13   #include <boost/corosio/endpoint.hpp>
14   #include <boost/corosio/local_endpoint.hpp> 14   #include <boost/corosio/local_endpoint.hpp>
15   #include <boost/corosio/detail/platform.hpp> 15   #include <boost/corosio/detail/platform.hpp>
16   16  
17   #include <algorithm> 17   #include <algorithm>
18   #include <cstring> 18   #include <cstring>
19   19  
20   #if BOOST_COROSIO_POSIX 20   #if BOOST_COROSIO_POSIX
21   #include <sys/socket.h> 21   #include <sys/socket.h>
22   #include <sys/un.h> 22   #include <sys/un.h>
23   #include <netinet/in.h> 23   #include <netinet/in.h>
24   #include <arpa/inet.h> 24   #include <arpa/inet.h>
25   #else 25   #else
26   #ifndef WIN32_LEAN_AND_MEAN 26   #ifndef WIN32_LEAN_AND_MEAN
27   #define WIN32_LEAN_AND_MEAN 27   #define WIN32_LEAN_AND_MEAN
28   #endif 28   #endif
29   #ifndef NOMINMAX 29   #ifndef NOMINMAX
30   #define NOMINMAX 30   #define NOMINMAX
31   #endif 31   #endif
32 - #include <WinSock2.h> 32 + #include <winsock2.h>
33 - #include <Ws2tcpip.h> 33 + #include <ws2tcpip.h>
34   #endif 34   #endif
35   35  
36   #include <cstddef> // offsetof 36   #include <cstddef> // offsetof
37   37  
38   #ifndef AF_UNIX 38   #ifndef AF_UNIX
39   #define AF_UNIX 1 39   #define AF_UNIX 1
40   #endif 40   #endif
41   41  
42   namespace boost::corosio::detail { 42   namespace boost::corosio::detail {
43   43  
44   /** Convert IPv4 endpoint to sockaddr_in. 44   /** Convert IPv4 endpoint to sockaddr_in.
45   45  
46   @param ep The endpoint to convert. Must be IPv4 (is_v4() == true). 46   @param ep The endpoint to convert. Must be IPv4 (is_v4() == true).
47   @return A sockaddr_in structure with fields in network byte order. 47   @return A sockaddr_in structure with fields in network byte order.
48   */ 48   */
49   inline sockaddr_in 49   inline sockaddr_in
HITCBC 50   5326 to_sockaddr_in(endpoint const& ep) noexcept 50   5351 to_sockaddr_in(endpoint const& ep) noexcept
51   { 51   {
HITCBC 52   5326 sockaddr_in sa{}; 52   5351 sockaddr_in sa{};
HITCBC 53   5326 sa.sin_family = AF_INET; 53   5351 sa.sin_family = AF_INET;
HITCBC 54   5326 sa.sin_port = htons(ep.port()); 54   5351 sa.sin_port = htons(ep.port());
HITCBC 55   5326 auto bytes = ep.v4_address().to_bytes(); 55   5351 auto bytes = ep.v4_address().to_bytes();
HITCBC 56   5326 std::memcpy(&sa.sin_addr, bytes.data(), 4); 56   5351 std::memcpy(&sa.sin_addr, bytes.data(), 4);
HITCBC 57   5326 return sa; 57   5351 return sa;
58   } 58   }
59   59  
60   /** Convert IPv6 endpoint to sockaddr_in6. 60   /** Convert IPv6 endpoint to sockaddr_in6.
61   61  
62   @param ep The endpoint to convert. Must be IPv6 (is_v6() == true). 62   @param ep The endpoint to convert. Must be IPv6 (is_v6() == true).
63   @return A sockaddr_in6 structure with fields in network byte order. 63   @return A sockaddr_in6 structure with fields in network byte order.
64   */ 64   */
65   inline sockaddr_in6 65   inline sockaddr_in6
HITCBC 66   52 to_sockaddr_in6(endpoint const& ep) noexcept 66   52 to_sockaddr_in6(endpoint const& ep) noexcept
67   { 67   {
HITCBC 68   52 sockaddr_in6 sa{}; 68   52 sockaddr_in6 sa{};
HITCBC 69   52 sa.sin6_family = AF_INET6; 69   52 sa.sin6_family = AF_INET6;
HITCBC 70   52 sa.sin6_port = htons(ep.port()); 70   52 sa.sin6_port = htons(ep.port());
HITCBC 71   52 auto bytes = ep.v6_address().to_bytes(); 71   52 auto bytes = ep.v6_address().to_bytes();
HITCBC 72   52 std::memcpy(&sa.sin6_addr, bytes.data(), 16); 72   52 std::memcpy(&sa.sin6_addr, bytes.data(), 16);
HITCBC 73   52 return sa; 73   52 return sa;
74   } 74   }
75   75  
76   /** Create endpoint from sockaddr_in. 76   /** Create endpoint from sockaddr_in.
77   77  
78   @param sa The sockaddr_in structure with fields in network byte order. 78   @param sa The sockaddr_in structure with fields in network byte order.
79   @return An endpoint with address and port extracted from sa. 79   @return An endpoint with address and port extracted from sa.
80   */ 80   */
81   inline endpoint 81   inline endpoint
HITCBC 82   9672 from_sockaddr_in(sockaddr_in const& sa) noexcept 82   9722 from_sockaddr_in(sockaddr_in const& sa) noexcept
83   { 83   {
84   ipv4_address::bytes_type bytes; 84   ipv4_address::bytes_type bytes;
HITCBC 85   9672 std::memcpy(bytes.data(), &sa.sin_addr, 4); 85   9722 std::memcpy(bytes.data(), &sa.sin_addr, 4);
HITCBC 86   9672 return endpoint(ipv4_address(bytes), ntohs(sa.sin_port)); 86   9722 return endpoint(ipv4_address(bytes), ntohs(sa.sin_port));
87   } 87   }
88   88  
89   /** Create endpoint from sockaddr_in6. 89   /** Create endpoint from sockaddr_in6.
90   90  
91   @param sa The sockaddr_in6 structure with fields in network byte order. 91   @param sa The sockaddr_in6 structure with fields in network byte order.
92   @return An endpoint with address and port extracted from sa. 92   @return An endpoint with address and port extracted from sa.
93   */ 93   */
94   inline endpoint 94   inline endpoint
HITCBC 95   84 from_sockaddr_in6(sockaddr_in6 const& sa) noexcept 95   84 from_sockaddr_in6(sockaddr_in6 const& sa) noexcept
96   { 96   {
97   ipv6_address::bytes_type bytes; 97   ipv6_address::bytes_type bytes;
HITCBC 98   84 std::memcpy(bytes.data(), &sa.sin6_addr, 16); 98   84 std::memcpy(bytes.data(), &sa.sin6_addr, 16);
HITCBC 99   84 return endpoint(ipv6_address(bytes), ntohs(sa.sin6_port)); 99   84 return endpoint(ipv6_address(bytes), ntohs(sa.sin6_port));
100   } 100   }
101   101  
102   /** Convert an IPv4 endpoint to an IPv4-mapped IPv6 sockaddr_in6. 102   /** Convert an IPv4 endpoint to an IPv4-mapped IPv6 sockaddr_in6.
103   103  
104   Produces a `sockaddr_in6` with the `::ffff:` prefix, suitable 104   Produces a `sockaddr_in6` with the `::ffff:` prefix, suitable
105   for passing an IPv4 destination to a dual-stack IPv6 socket. 105   for passing an IPv4 destination to a dual-stack IPv6 socket.
106   106  
107   @param ep The endpoint to convert. Must be IPv4 (is_v4() == true). 107   @param ep The endpoint to convert. Must be IPv4 (is_v4() == true).
108   @return A sockaddr_in6 with the IPv4-mapped address. 108   @return A sockaddr_in6 with the IPv4-mapped address.
109   */ 109   */
110   inline sockaddr_in6 110   inline sockaddr_in6
HITCBC 111   2 to_v4_mapped_sockaddr_in6(endpoint const& ep) noexcept 111   2 to_v4_mapped_sockaddr_in6(endpoint const& ep) noexcept
112   { 112   {
HITCBC 113   2 sockaddr_in6 sa{}; 113   2 sockaddr_in6 sa{};
HITCBC 114   2 sa.sin6_family = AF_INET6; 114   2 sa.sin6_family = AF_INET6;
HITCBC 115   2 sa.sin6_port = htons(ep.port()); 115   2 sa.sin6_port = htons(ep.port());
116   // ::ffff:0:0/96 prefix 116   // ::ffff:0:0/96 prefix
HITCBC 117   2 sa.sin6_addr.s6_addr[10] = 0xff; 117   2 sa.sin6_addr.s6_addr[10] = 0xff;
HITCBC 118   2 sa.sin6_addr.s6_addr[11] = 0xff; 118   2 sa.sin6_addr.s6_addr[11] = 0xff;
HITCBC 119   2 auto bytes = ep.v4_address().to_bytes(); 119   2 auto bytes = ep.v4_address().to_bytes();
HITCBC 120   2 std::memcpy(&sa.sin6_addr.s6_addr[12], bytes.data(), 4); 120   2 std::memcpy(&sa.sin6_addr.s6_addr[12], bytes.data(), 4);
HITCBC 121   2 return sa; 121   2 return sa;
122   } 122   }
123   123  
124   /** Convert endpoint to sockaddr_storage. 124   /** Convert endpoint to sockaddr_storage.
125   125  
126   Dispatches to @ref to_sockaddr_in or @ref to_sockaddr_in6 126   Dispatches to @ref to_sockaddr_in or @ref to_sockaddr_in6
127   based on the endpoint's address family. 127   based on the endpoint's address family.
128   128  
129   @param ep The endpoint to convert. 129   @param ep The endpoint to convert.
130   @param storage Output parameter filled with the sockaddr. 130   @param storage Output parameter filled with the sockaddr.
131   @return The length of the filled sockaddr structure. 131   @return The length of the filled sockaddr structure.
132   */ 132   */
133   inline socklen_t 133   inline socklen_t
HITCBC 134   5360 to_sockaddr(endpoint const& ep, sockaddr_storage& storage) noexcept 134   5385 to_sockaddr(endpoint const& ep, sockaddr_storage& storage) noexcept
135   { 135   {
HITCBC 136   5360 std::memset(&storage, 0, sizeof(storage)); 136   5385 std::memset(&storage, 0, sizeof(storage));
HITCBC 137   5360 if (ep.is_v4()) 137   5385 if (ep.is_v4())
138   { 138   {
HITCBC 139   5310 auto sa = to_sockaddr_in(ep); 139   5335 auto sa = to_sockaddr_in(ep);
HITCBC 140   5310 std::memcpy(&storage, &sa, sizeof(sa)); 140   5335 std::memcpy(&storage, &sa, sizeof(sa));
HITCBC 141   5310 return sizeof(sa); 141   5335 return sizeof(sa);
142   } 142   }
HITCBC 143   50 auto sa6 = to_sockaddr_in6(ep); 143   50 auto sa6 = to_sockaddr_in6(ep);
HITCBC 144   50 std::memcpy(&storage, &sa6, sizeof(sa6)); 144   50 std::memcpy(&storage, &sa6, sizeof(sa6));
HITCBC 145   50 return sizeof(sa6); 145   50 return sizeof(sa6);
146   } 146   }
147   147  
148   /** Convert endpoint to sockaddr_storage for a specific socket family. 148   /** Convert endpoint to sockaddr_storage for a specific socket family.
149   149  
150   When the socket is AF_INET6 and the endpoint is IPv4, the address 150   When the socket is AF_INET6 and the endpoint is IPv4, the address
151   is converted to an IPv4-mapped IPv6 address (`::ffff:x.x.x.x`) so 151   is converted to an IPv4-mapped IPv6 address (`::ffff:x.x.x.x`) so
152   dual-stack sockets can connect to IPv4 destinations. 152   dual-stack sockets can connect to IPv4 destinations.
153   153  
154   @param ep The endpoint to convert. 154   @param ep The endpoint to convert.
155   @param socket_family The address family of the socket (AF_INET or 155   @param socket_family The address family of the socket (AF_INET or
156   AF_INET6). 156   AF_INET6).
157   @param storage Output parameter filled with the sockaddr. 157   @param storage Output parameter filled with the sockaddr.
158   @return The length of the filled sockaddr structure. 158   @return The length of the filled sockaddr structure.
159   */ 159   */
160   inline socklen_t 160   inline socklen_t
HITCBC 161   4765 to_sockaddr( 161   4790 to_sockaddr(
162   endpoint const& ep, int socket_family, sockaddr_storage& storage) noexcept 162   endpoint const& ep, int socket_family, sockaddr_storage& storage) noexcept
163   { 163   {
164   // IPv4 endpoint on IPv6 socket: use IPv4-mapped address 164   // IPv4 endpoint on IPv6 socket: use IPv4-mapped address
HITCBC 165   4765 if (ep.is_v4() && socket_family == AF_INET6) 165   4790 if (ep.is_v4() && socket_family == AF_INET6)
166   { 166   {
HITCBC 167   2 std::memset(&storage, 0, sizeof(storage)); 167   2 std::memset(&storage, 0, sizeof(storage));
HITCBC 168   2 auto sa6 = to_v4_mapped_sockaddr_in6(ep); 168   2 auto sa6 = to_v4_mapped_sockaddr_in6(ep);
HITCBC 169   2 std::memcpy(&storage, &sa6, sizeof(sa6)); 169   2 std::memcpy(&storage, &sa6, sizeof(sa6));
HITCBC 170   2 return sizeof(sa6); 170   2 return sizeof(sa6);
171   } 171   }
HITCBC 172   4763 return to_sockaddr(ep, storage); 172   4788 return to_sockaddr(ep, storage);
173   } 173   }
174   174  
175   /** Create endpoint from sockaddr_storage. 175   /** Create endpoint from sockaddr_storage.
176   176  
177   Dispatches on `ss_family` to reconstruct the appropriate 177   Dispatches on `ss_family` to reconstruct the appropriate
178   IPv4 or IPv6 endpoint. 178   IPv4 or IPv6 endpoint.
179   179  
180   @param storage The sockaddr_storage with fields in network byte order. 180   @param storage The sockaddr_storage with fields in network byte order.
181   @return An endpoint with address and port extracted from storage. 181   @return An endpoint with address and port extracted from storage.
182   */ 182   */
183   inline endpoint 183   inline endpoint
HITCBC 184   9737 from_sockaddr(sockaddr_storage const& storage) noexcept 184   9787 from_sockaddr(sockaddr_storage const& storage) noexcept
185   { 185   {
HITCBC 186   9737 if (storage.ss_family == AF_INET) 186   9787 if (storage.ss_family == AF_INET)
187   { 187   {
188   sockaddr_in sa; 188   sockaddr_in sa;
HITCBC 189   9655 std::memcpy(&sa, &storage, sizeof(sa)); 189   9705 std::memcpy(&sa, &storage, sizeof(sa));
HITCBC 190   9655 return from_sockaddr_in(sa); 190   9705 return from_sockaddr_in(sa);
191   } 191   }
HITCBC 192   82 if (storage.ss_family == AF_INET6) 192   82 if (storage.ss_family == AF_INET6)
193   { 193   {
194   sockaddr_in6 sa6; 194   sockaddr_in6 sa6;
HITCBC 195   82 std::memcpy(&sa6, &storage, sizeof(sa6)); 195   82 std::memcpy(&sa6, &storage, sizeof(sa6));
HITCBC 196   82 return from_sockaddr_in6(sa6); 196   82 return from_sockaddr_in6(sa6);
197   } 197   }
MISUBC 198   ✗ return endpoint{}; 198   ✗ return endpoint{};
199   } 199   }
200   200  
201   /** Return the native address family for an endpoint. 201   /** Return the native address family for an endpoint.
202   202  
203   @param ep The endpoint to query. 203   @param ep The endpoint to query.
204   @return `AF_INET` for IPv4, `AF_INET6` for IPv6. 204   @return `AF_INET` for IPv4, `AF_INET6` for IPv6.
205   */ 205   */
206   inline int 206   inline int
207   endpoint_family(endpoint const& ep) noexcept 207   endpoint_family(endpoint const& ep) noexcept
208   { 208   {
209   return ep.is_v6() ? AF_INET6 : AF_INET; 209   return ep.is_v6() ? AF_INET6 : AF_INET;
210   } 210   }
211   211  
212   /** Return the address family of a socket descriptor. 212   /** Return the address family of a socket descriptor.
213   213  
214   @param fd The socket file descriptor. 214   @param fd The socket file descriptor.
215   @return AF_INET, AF_INET6, or AF_UNSPEC on failure. 215   @return AF_INET, AF_INET6, or AF_UNSPEC on failure.
216   */ 216   */
217   inline int 217   inline int
HITCBC 218   4974 socket_family( 218   4999 socket_family(
219   #if BOOST_COROSIO_POSIX 219   #if BOOST_COROSIO_POSIX
220   int fd 220   int fd
221   #else 221   #else
222   std::uintptr_t fd 222   std::uintptr_t fd
223   #endif 223   #endif
224   ) noexcept 224   ) noexcept
225   { 225   {
HITCBC 226   4974 sockaddr_storage storage{}; 226   4999 sockaddr_storage storage{};
HITCBC 227   4974 socklen_t len = sizeof(storage); 227   4999 socklen_t len = sizeof(storage);
HITCBC 228   4974 if (getsockname( 228   4999 if (getsockname(
229   #if BOOST_COROSIO_POSIX 229   #if BOOST_COROSIO_POSIX
230   fd, 230   fd,
231   #else 231   #else
232   static_cast<SOCKET>(fd), 232   static_cast<SOCKET>(fd),
233   #endif 233   #endif
HITCBC 234   4974 reinterpret_cast<sockaddr*>(&storage), &len) != 0) 234   4999 reinterpret_cast<sockaddr*>(&storage), &len) != 0)
HITCBC 235   2 return AF_UNSPEC; 235   2 return AF_UNSPEC;
HITCBC 236   4972 return storage.ss_family; 236   4997 return storage.ss_family;
237   } 237   }
238   238  
239   //---------------------------------------------------------- 239   //----------------------------------------------------------
240   // local_endpoint (AF_UNIX) conversions 240   // local_endpoint (AF_UNIX) conversions
241   //---------------------------------------------------------- 241   //----------------------------------------------------------
242   242  
243   // Platform-agnostic sockaddr_un alias. POSIX uses the real 243   // Platform-agnostic sockaddr_un alias. POSIX uses the real
244   // sockaddr_un from <sys/un.h>; Windows uses a private struct 244   // sockaddr_un from <sys/un.h>; Windows uses a private struct
245   // matching the layout (same approach as Boost.Asio). 245   // matching the layout (same approach as Boost.Asio).
246   #if BOOST_COROSIO_POSIX 246   #if BOOST_COROSIO_POSIX
247   using un_sa_t = sockaddr_un; 247   using un_sa_t = sockaddr_un;
248   #else 248   #else
249   struct un_sa_t 249   struct un_sa_t
250   { 250   {
251   u_short sun_family; 251   u_short sun_family;
252   char sun_path[108]; 252   char sun_path[108];
253   }; 253   };
254   #endif 254   #endif
255   255  
256   /** Convert a local_endpoint to sockaddr_storage. 256   /** Convert a local_endpoint to sockaddr_storage.
257   257  
258   @param ep The local endpoint to convert. 258   @param ep The local endpoint to convert.
259   @param storage Output parameter filled with the sockaddr_un. 259   @param storage Output parameter filled with the sockaddr_un.
260   @return The length of the filled sockaddr structure. 260   @return The length of the filled sockaddr structure.
261   */ 261   */
262   inline socklen_t 262   inline socklen_t
HITCBC 263   284 to_sockaddr(local_endpoint const& ep, sockaddr_storage& storage) noexcept 263   284 to_sockaddr(local_endpoint const& ep, sockaddr_storage& storage) noexcept
264   { 264   {
HITCBC 265   284 std::memset(&storage, 0, sizeof(storage)); 265   284 std::memset(&storage, 0, sizeof(storage));
HITCBC 266   284 un_sa_t sa{}; 266   284 un_sa_t sa{};
HITCBC 267   284 sa.sun_family = AF_UNIX; 267   284 sa.sun_family = AF_UNIX;
HITCBC 268   284 auto path = ep.path(); 268   284 auto path = ep.path();
HITCBC 269   284 auto copy_len = (std::min)(path.size(), sizeof(sa.sun_path)); 269   284 auto copy_len = (std::min)(path.size(), sizeof(sa.sun_path));
HITCBC 270   284 if (copy_len > 0) 270   284 if (copy_len > 0)
HITCBC 271   284 std::memcpy(sa.sun_path, path.data(), copy_len); 271   284 std::memcpy(sa.sun_path, path.data(), copy_len);
HITCBC 272   284 std::memcpy(&storage, &sa, sizeof(sa)); 272   284 std::memcpy(&storage, &sa, sizeof(sa));
273   273  
HITCBC 274   284 if (ep.is_abstract()) 274   284 if (ep.is_abstract())
HITCBC 275   6 return static_cast<socklen_t>(offsetof(un_sa_t, sun_path) + copy_len); 275   6 return static_cast<socklen_t>(offsetof(un_sa_t, sun_path) + copy_len);
HITCBC 276   278 return static_cast<socklen_t>(sizeof(sa)); 276   278 return static_cast<socklen_t>(sizeof(sa));
277   } 277   }
278   278  
279   /** Convert a local_endpoint to sockaddr_storage (family-aware overload). 279   /** Convert a local_endpoint to sockaddr_storage (family-aware overload).
280   280  
281   The socket_family parameter is ignored for Unix sockets since 281   The socket_family parameter is ignored for Unix sockets since
282   there is no dual-stack mapping. 282   there is no dual-stack mapping.
283   283  
284   @param ep The local endpoint to convert. 284   @param ep The local endpoint to convert.
285   @param socket_family Ignored. 285   @param socket_family Ignored.
286   @param storage Output parameter filled with the sockaddr_un. 286   @param storage Output parameter filled with the sockaddr_un.
287   @return The length of the filled sockaddr structure. 287   @return The length of the filled sockaddr structure.
288   */ 288   */
289   inline socklen_t 289   inline socklen_t
HITCBC 290   209 to_sockaddr( 290   209 to_sockaddr(
291   local_endpoint const& ep, 291   local_endpoint const& ep,
292   int /*socket_family*/, 292   int /*socket_family*/,
293   sockaddr_storage& storage) noexcept 293   sockaddr_storage& storage) noexcept
294   { 294   {
HITCBC 295   209 return to_sockaddr(ep, storage); 295   209 return to_sockaddr(ep, storage);
296   } 296   }
297   297  
298   /** Create a local_endpoint from sockaddr_storage. 298   /** Create a local_endpoint from sockaddr_storage.
299   299  
300   @param storage The sockaddr_storage (must have ss_family == AF_UNIX). 300   @param storage The sockaddr_storage (must have ss_family == AF_UNIX).
301   @param len The address length returned by the kernel. 301   @param len The address length returned by the kernel.
302   @return A local_endpoint with the path extracted from the 302   @return A local_endpoint with the path extracted from the
303   sockaddr_un, or an empty endpoint if the family is not AF_UNIX. 303   sockaddr_un, or an empty endpoint if the family is not AF_UNIX.
304   */ 304   */
305   inline local_endpoint 305   inline local_endpoint
HITCBC 306   894 from_sockaddr_local(sockaddr_storage const& storage, socklen_t len) noexcept 306   894 from_sockaddr_local(sockaddr_storage const& storage, socklen_t len) noexcept
307   { 307   {
HITCBC 308   894 if (storage.ss_family != AF_UNIX) 308   894 if (storage.ss_family != AF_UNIX)
HITCBC 309   1 return local_endpoint{}; 309   1 return local_endpoint{};
310   310  
HITCBC 311   893 un_sa_t sa{}; 311   893 un_sa_t sa{};
HITCBC 312   893 std::memcpy( 312   893 std::memcpy(
HITCBC 313   893 &sa, &storage, (std::min)(static_cast<std::size_t>(len), sizeof(sa))); 313   893 &sa, &storage, (std::min)(static_cast<std::size_t>(len), sizeof(sa)));
314   314  
HITCBC 315   893 auto path_offset = offsetof(un_sa_t, sun_path); 315   893 auto path_offset = offsetof(un_sa_t, sun_path);
HITCBC 316   893 if (static_cast<std::size_t>(len) <= path_offset) 316   893 if (static_cast<std::size_t>(len) <= path_offset)
HITCBC 317   663 return local_endpoint{}; 317   663 return local_endpoint{};
318   318  
319   // Clamp to the buffer: a foreign len may overstate the payload, 319   // Clamp to the buffer: a foreign len may overstate the payload,
320   // and sun_path is the struct's last member. 320   // and sun_path is the struct's last member.
HITCBC 321   460 auto path_len = (std::min)(static_cast<std::size_t>(len) - path_offset, 321   460 auto path_len = (std::min)(static_cast<std::size_t>(len) - path_offset,
HITCBC 322   230 sizeof(sa.sun_path)); 322   230 sizeof(sa.sun_path));
323   323  
324   // Non-abstract paths may be null-terminated by the kernel 324   // Non-abstract paths may be null-terminated by the kernel
HITCBC 325   230 if (path_len > 0 && sa.sun_path[0] != '\0') 325   230 if (path_len > 0 && sa.sun_path[0] != '\0')
326   { 326   {
327   auto* end = 327   auto* end =
HITCBC 328   224 static_cast<char const*>(std::memchr(sa.sun_path, '\0', path_len)); 328   224 static_cast<char const*>(std::memchr(sa.sun_path, '\0', path_len));
HITCBC 329   224 if (end) 329   224 if (end)
HITCBC 330   224 path_len = static_cast<std::size_t>(end - sa.sun_path); 330   224 path_len = static_cast<std::size_t>(end - sa.sun_path);
331   } 331   }
332   332  
333   // A foreign sun_path may exceed corosio's cap; the length 333   // A foreign sun_path may exceed corosio's cap; the length
334   // pre-check keeps the throwing constructor unreachable. 334   // pre-check keeps the throwing constructor unreachable.
HITCBC 335   230 if (path_len > local_endpoint::max_path_length) 335   230 if (path_len > local_endpoint::max_path_length)
MISUBC 336   ✗ return local_endpoint{}; 336   ✗ return local_endpoint{};
HITCBC 337   230 return local_endpoint(std::string_view(sa.sun_path, path_len)); 337   230 return local_endpoint(std::string_view(sa.sun_path, path_len));
338   } 338   }
339   339  
340   //---------------------------------------------------------- 340   //----------------------------------------------------------
341   // Tag-dispatch helpers for templatized reactor code. 341   // Tag-dispatch helpers for templatized reactor code.
342   // Overload resolution selects the correct conversion based 342   // Overload resolution selects the correct conversion based
343   // on the Endpoint type. 343   // on the Endpoint type.
344   //---------------------------------------------------------- 344   //----------------------------------------------------------
345   345  
346   /** Convert sockaddr_storage to an IP endpoint (tag overload). 346   /** Convert sockaddr_storage to an IP endpoint (tag overload).
347   347  
348   @param storage The sockaddr_storage with fields in network byte order. 348   @param storage The sockaddr_storage with fields in network byte order.
349   @param len The address length returned by the kernel. 349   @param len The address length returned by the kernel.
350   @return An endpoint with address and port extracted from storage. 350   @return An endpoint with address and port extracted from storage.
351   */ 351   */
352   inline endpoint 352   inline endpoint
HITCBC 353   9737 from_sockaddr_as( 353   9787 from_sockaddr_as(
354   sockaddr_storage const& storage, 354   sockaddr_storage const& storage,
355   socklen_t /*len*/, 355   socklen_t /*len*/,
356   endpoint const&) noexcept 356   endpoint const&) noexcept
357   { 357   {
HITCBC 358   9737 return from_sockaddr(storage); 358   9787 return from_sockaddr(storage);
359   } 359   }
360   360  
361   /** Convert sockaddr_storage to a local_endpoint (tag overload). 361   /** Convert sockaddr_storage to a local_endpoint (tag overload).
362   362  
363   @param storage The sockaddr_storage. 363   @param storage The sockaddr_storage.
364   @param len The address length returned by the kernel. 364   @param len The address length returned by the kernel.
365   @return A local_endpoint with path extracted from storage. 365   @return A local_endpoint with path extracted from storage.
366   */ 366   */
367   inline local_endpoint 367   inline local_endpoint
HITCBC 368   894 from_sockaddr_as( 368   894 from_sockaddr_as(
369   sockaddr_storage const& storage, 369   sockaddr_storage const& storage,
370   socklen_t len, 370   socklen_t len,
371   local_endpoint const&) noexcept 371   local_endpoint const&) noexcept
372   { 372   {
HITCBC 373   894 return from_sockaddr_local(storage, len); 373   894 return from_sockaddr_local(storage, len);
374   } 374   }
375   375  
376   } // namespace boost::corosio::detail 376   } // namespace boost::corosio::detail
377   377  
378   #endif 378   #endif