diff options
Diffstat (limited to 'generic/tclIOSock.c')
| -rw-r--r-- | generic/tclIOSock.c | 169 |
1 files changed, 168 insertions, 1 deletions
diff --git a/generic/tclIOSock.c b/generic/tclIOSock.c index e259676..6921af4 100644 --- a/generic/tclIOSock.c +++ b/generic/tclIOSock.c @@ -10,6 +10,12 @@ */ #include "tclInt.h" + +#if defined(_WIN32) && defined(UNICODE) +/* On Windows, we always need the ASCII version. */ +# undef gai_strerror +# define gai_strerror gai_strerrorA +#endif /* *--------------------------------------------------------------------------- @@ -81,7 +87,6 @@ TclSockGetPort( *---------------------------------------------------------------------- */ -#undef TclSockMinimumBuffers #ifndef _WIN32 # define SOCKET size_t #endif @@ -110,6 +115,168 @@ TclSockMinimumBuffers( } /* + *---------------------------------------------------------------------- + * + * TclCreateSocketAddress -- + * + * This function initializes a sockaddr structure for a host and port. + * + * Results: + * 1 if the host was valid, 0 if the host could not be converted to an IP + * address. + * + * Side effects: + * Fills in the *sockaddrPtr structure. + * + *---------------------------------------------------------------------- + */ + +int +TclCreateSocketAddress( + Tcl_Interp *interp, /* Interpreter for querying + * the desired socket family */ + struct addrinfo **addrlist, /* Socket address list */ + const char *host, /* Host. NULL implies INADDR_ANY */ + int port, /* Port number */ + int willBind, /* Is this an address to bind() to or + * to connect() to? */ + const char **errorMsgPtr) /* Place to store the error message + * detail, if available. */ +{ + struct addrinfo hints; + struct addrinfo *p; + struct addrinfo *v4head = NULL, *v4ptr = NULL; + struct addrinfo *v6head = NULL, *v6ptr = NULL; + char *native = NULL, portstring[TCL_INTEGER_SPACE]; + const char *family = NULL; + Tcl_DString ds; + int result, i; + + TclFormatInt(portstring, port); + + if (host != NULL) { + native = Tcl_UtfToExternalDString(NULL, host, -1, &ds); + } + + (void) memset(&hints, 0, sizeof(hints)); + + hints.ai_family = AF_UNSPEC; + /* + * Magic variable to enforce a certain address family - to be superseded + * by a TIP that adds explicit switches to [socket] + */ + if (interp != NULL) { + family = Tcl_GetVar(interp, "::tcl::unsupported::socketAF", 0); + if (family != NULL) { + if (strcmp(family, "inet") == 0) { + hints.ai_family = AF_INET; + } else if (strcmp(family, "inet6") == 0) { + hints.ai_family = AF_INET6; + } + } + } + + hints.ai_socktype = SOCK_STREAM; +#if 0 + /* + * We found some problems when using AI_ADDRCONFIG, e.g. on systems that + * have no networking besides the loopback interface and want to resolve + * localhost. See bugs 3385024, 3382419, 3382431. As the advantage of + * using AI_ADDRCONFIG in situations where it works, is probably low, + * we'll leave it out for now. After all, it is just an optimisation. + */ +#if defined(AI_ADDRCONFIG) && !defined(_AIX) && !defined(__hpux) + /* + * Missing on: OpenBSD, NetBSD. + * Causes failure when used on AIX 5.1 and HP-UX + */ + hints.ai_flags |= AI_ADDRCONFIG; +#endif +#endif + if (willBind) { + hints.ai_flags |= AI_PASSIVE; + } + + result = getaddrinfo(native, portstring, &hints, addrlist); + + if (host != NULL) { + Tcl_DStringFree(&ds); + } + + if (result != 0) { + goto error; + } + + /* + * Put IPv4 addresses before IPv6 addresses to maximize backwards + * compatibility of [fconfigure -sockname] output. + * + * There might be more elegant/efficient ways to do this. + */ + if (willBind) { + for (p = *addrlist; p != NULL; p = p->ai_next) { + if (p->ai_family == AF_INET) { + if (v4head == NULL) { + v4head = p; + } else { + v4ptr->ai_next = p; + } + v4ptr = p; + } else { + if (v6head == NULL) { + v6head = p; + } else { + v6ptr->ai_next = p; + } + v6ptr = p; + } + } + *addrlist = NULL; + if (v6head != NULL) { + *addrlist = v6head; + v6ptr->ai_next = NULL; + } + if (v4head != NULL) { + v4ptr->ai_next = *addrlist; + *addrlist = v4head; + } + } + i = 0; + for (p = *addrlist; p != NULL; p = p->ai_next) { + i++; + } + + return 1; + + /* + * Ought to use gai_strerror() here... + */ + +error: + switch (result) { + case EAI_NONAME: + case EAI_SERVICE: +#if defined(EAI_ADDRFAMILY) && EAI_ADDRFAMILY != EAI_NONAME + case EAI_ADDRFAMILY: +#endif +#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME + case EAI_NODATA: +#endif + *errorMsgPtr = gai_strerror(result); + errno = EHOSTUNREACH; + return 0; +#ifdef EAI_SYSTEM + case EAI_SYSTEM: + return 0; +#endif + default: + *errorMsgPtr = gai_strerror(result); + errno = ENXIO; + return 0; + } +} + +/* * Local Variables: * mode: c * c-basic-offset: 4 |