granicus.if.org Git - postgresql/blob - src/interfaces/libpq/win32.c

   1 /*
   2  * src/interfaces/libpq/win32.c
   3  *
   4  *
   5  *      FILE
   6  *              win32.c
   7  *
   8  *      DESCRIPTION
   9  *              Win32 support functions.
  10  *
  11  * Contains table and functions for looking up win32 socket error
  12  * descriptions. But will/may contain other win32 helper functions
  13  * for libpq.
  14  *
  15  * The error constants are taken from the Frambak Bakfram LGSOCKET
  16  * library guys who in turn took them from the Winsock FAQ.
  17  *
  18  * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
  19  * Portions Copyright (c) 1994, Regents of the University of California
  20  *
  21  */
  22
  23 /* Make stuff compile faster by excluding not used stuff */
  24
  25 #define VC_EXTRALEAN
  26 #ifndef __MINGW32__
  27 #define NOGDI
  28 #endif
  29 #define NOCRYPT
  30
  31 #include "postgres_fe.h"
  32
  33 #include "win32.h"
  34
  35 /* Declared here to avoid pulling in all includes, which causes name collissions */
  36 #ifdef ENABLE_NLS
  37 extern char *
  38 libpq_gettext(const char *msgid)
  39 __attribute__((format_arg(1)));
  40 #else
  41 #define libpq_gettext(x) (x)
  42 #endif
  43
  44
  45 static struct WSErrorEntry
  46 {
  47         DWORD           error;
  48         const char *description;
  49 }       WSErrors[] =
  50
  51 {
  52         {
  53                 0, "No error"
  54         },
  55         {
  56                 WSAEINTR, "Interrupted system call"
  57         },
  58         {
  59                 WSAEBADF, "Bad file number"
  60         },
  61         {
  62                 WSAEACCES, "Permission denied"
  63         },
  64         {
  65                 WSAEFAULT, "Bad address"
  66         },
  67         {
  68                 WSAEINVAL, "Invalid argument"
  69         },
  70         {
  71                 WSAEMFILE, "Too many open sockets"
  72         },
  73         {
  74                 WSAEWOULDBLOCK, "Operation would block"
  75         },
  76         {
  77                 WSAEINPROGRESS, "Operation now in progress"
  78         },
  79         {
  80                 WSAEALREADY, "Operation already in progress"
  81         },
  82         {
  83                 WSAENOTSOCK, "Socket operation on non-socket"
  84         },
  85         {
  86                 WSAEDESTADDRREQ, "Destination address required"
  87         },
  88         {
  89                 WSAEMSGSIZE, "Message too long"
  90         },
  91         {
  92                 WSAEPROTOTYPE, "Protocol wrong type for socket"
  93         },
  94         {
  95                 WSAENOPROTOOPT, "Bad protocol option"
  96         },
  97         {
  98                 WSAEPROTONOSUPPORT, "Protocol not supported"
  99         },
 100         {
 101                 WSAESOCKTNOSUPPORT, "Socket type not supported"
 102         },
 103         {
 104                 WSAEOPNOTSUPP, "Operation not supported on socket"
 105         },
 106         {
 107                 WSAEPFNOSUPPORT, "Protocol family not supported"
 108         },
 109         {
 110                 WSAEAFNOSUPPORT, "Address family not supported"
 111         },
 112         {
 113                 WSAEADDRINUSE, "Address already in use"
 114         },
 115         {
 116                 WSAEADDRNOTAVAIL, "Cannot assign requested address"
 117         },
 118         {
 119                 WSAENETDOWN, "Network is down"
 120         },
 121         {
 122                 WSAENETUNREACH, "Network is unreachable"
 123         },
 124         {
 125                 WSAENETRESET, "Net connection reset"
 126         },
 127         {
 128                 WSAECONNABORTED, "Software caused connection abort"
 129         },
 130         {
 131                 WSAECONNRESET, "Connection reset by peer"
 132         },
 133         {
 134                 WSAENOBUFS, "No buffer space available"
 135         },
 136         {
 137                 WSAEISCONN, "Socket is already connected"
 138         },
 139         {
 140                 WSAENOTCONN, "Socket is not connected"
 141         },
 142         {
 143                 WSAESHUTDOWN, "Cannot send after socket shutdown"
 144         },
 145         {
 146                 WSAETOOMANYREFS, "Too many references, cannot splice"
 147         },
 148         {
 149                 WSAETIMEDOUT, "Connection timed out"
 150         },
 151         {
 152                 WSAECONNREFUSED, "Connection refused"
 153         },
 154         {
 155                 WSAELOOP, "Too many levels of symbolic links"
 156         },
 157         {
 158                 WSAENAMETOOLONG, "File name too long"
 159         },
 160         {
 161                 WSAEHOSTDOWN, "Host is down"
 162         },
 163         {
 164                 WSAEHOSTUNREACH, "No route to host"
 165         },
 166         {
 167                 WSAENOTEMPTY, "Directory not empty"
 168         },
 169         {
 170                 WSAEPROCLIM, "Too many processes"
 171         },
 172         {
 173                 WSAEUSERS, "Too many users"
 174         },
 175         {
 176                 WSAEDQUOT, "Disc quota exceeded"
 177         },
 178         {
 179                 WSAESTALE, "Stale NFS file handle"
 180         },
 181         {
 182                 WSAEREMOTE, "Too many levels of remote in path"
 183         },
 184         {
 185                 WSASYSNOTREADY, "Network system is unavailable"
 186         },
 187         {
 188                 WSAVERNOTSUPPORTED, "Winsock version out of range"
 189         },
 190         {
 191                 WSANOTINITIALISED, "WSAStartup not yet called"
 192         },
 193         {
 194                 WSAEDISCON, "Graceful shutdown in progress"
 195         },
 196         {
 197                 WSAHOST_NOT_FOUND, "Host not found"
 198         },
 199         {
 200                 WSATRY_AGAIN, "NA Host not found / SERVFAIL"
 201         },
 202         {
 203                 WSANO_RECOVERY, "Non recoverable FORMERR||REFUSED||NOTIMP"
 204         },
 205         {
 206                 WSANO_DATA, "No host data of that type was found"
 207         },
 208         {
 209                 0, 0
 210         }                                                       /* End of table */
 211 };
 212
 213
 214 /*
 215  * Returns 0 if not found, linear but who cares, at this moment
 216  * we're already in pain :)
 217  */
 218
 219 static int
 220 LookupWSErrorMessage(DWORD err, char *dest)
 221 {
 222         struct WSErrorEntry *e;
 223
 224         for (e = WSErrors; e->description; e++)
 225         {
 226                 if (e->error == err)
 227                 {
 228                         strcpy(dest, e->description);
 229                         return 1;
 230                 }
 231         }
 232         return 0;
 233 }
 234
 235
 236 struct MessageDLL
 237 {
 238         const char *dll_name;
 239         void       *handle;
 240         int                     loaded;                 /* BOOL */
 241 }       dlls[] =
 242
 243 {
 244         {
 245                 "netmsg.dll", 0, 0
 246         },
 247         {
 248                 "winsock.dll", 0, 0
 249         },
 250         {
 251                 "wsock32.dll", 0, 0
 252         },
 253         {
 254                 "ws2_32.dll", 0, 0
 255         },
 256         {
 257                 "wsock32n.dll", 0, 0
 258         },
 259         {
 260                 "mswsock.dll", 0, 0
 261         },
 262         {
 263                 "ws2help.dll", 0, 0
 264         },
 265         {
 266                 "ws2thk.dll", 0, 0
 267         },
 268         {
 269                 0, 0, 1
 270         }                                                       /* Last one, no dll, always loaded */
 271 };
 272
 273 #define DLLS_SIZE (sizeof(dlls)/sizeof(struct MessageDLL))
 274
 275 /*
 276  * Returns a description of the socket error by first trying
 277  * to find it in the lookup table, and if that fails, tries
 278  * to load any of the winsock dlls to find that message.
 279  * The DLL thing works from Nt4 (spX ?) up, but some special
 280  * versions of winsock might have this as well (seen on Win98 SE
 281  * special install)                        / Magnus Naeslund (mag@fbab.net)
 282  *
 283  */
 284
 285 const char *
 286 winsock_strerror(int err, char *strerrbuf, size_t buflen)
 287 {
 288         unsigned long flags;
 289         int                     offs,
 290                                 i;
 291         int                     success = LookupWSErrorMessage(err, strerrbuf);
 292
 293         for (i = 0; !success && i < DLLS_SIZE; i++)
 294         {
 295
 296                 if (!dlls[i].loaded)
 297                 {
 298                         dlls[i].loaded = 1; /* Only load once */
 299                         dlls[i].handle = (void *) LoadLibraryEx(
 300                                                                                                         dlls[i].dll_name,
 301                                                                                                         0,
 302                                                                                                         LOAD_LIBRARY_AS_DATAFILE);
 303                 }
 304
 305                 if (dlls[i].dll_name && !dlls[i].handle)
 306                         continue;                       /* Didn't load */
 307
 308                 flags = FORMAT_MESSAGE_FROM_SYSTEM
 309                         | FORMAT_MESSAGE_IGNORE_INSERTS
 310                         | (dlls[i].handle ? FORMAT_MESSAGE_FROM_HMODULE : 0);
 311
 312                 success = 0 != FormatMessage(
 313                                                                          flags,
 314                                                                          dlls[i].handle, err,
 315                                                                    MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
 316                                                                          strerrbuf, buflen - 64,
 317                                                                          0
 318                         );
 319         }
 320
 321         if (!success)
 322                 sprintf(strerrbuf, libpq_gettext("Unknown socket error (0x%08X/%d)"), err, err);
 323         else
 324         {
 325                 strerrbuf[buflen - 1] = '\0';
 326                 offs = strlen(strerrbuf);
 327                 if (offs > (int) buflen - 64)
 328                         offs = buflen - 64;
 329                 sprintf(strerrbuf + offs, " (0x%08X/%d)", err, err);
 330         }
 331         return strerrbuf;
 332 }