diff options
Diffstat (limited to 'external/libevent_files/evutil.c')
| -rw-r--r-- | external/libevent_files/evutil.c | 2190 |
1 files changed, 0 insertions, 2190 deletions
diff --git a/external/libevent_files/evutil.c b/external/libevent_files/evutil.c deleted file mode 100644 index 05e662aa..00000000 --- a/external/libevent_files/evutil.c +++ /dev/null @@ -1,2190 +0,0 @@ -/* - * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. 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. - * 3. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "event2/event-config.h" - -#define _GNU_SOURCE - -#ifdef WIN32 -#include <winsock2.h> -#include <ws2tcpip.h> -#define WIN32_LEAN_AND_MEAN -#include <windows.h> -#undef WIN32_LEAN_AND_MEAN -#include <io.h> -#include <tchar.h> -#endif - -#include <sys/types.h> -#ifdef _EVENT_HAVE_SYS_SOCKET_H -#include <sys/socket.h> -#endif -#ifdef _EVENT_HAVE_UNISTD_H -#include <unistd.h> -#endif -#ifdef _EVENT_HAVE_FCNTL_H -#include <fcntl.h> -#endif -#ifdef _EVENT_HAVE_STDLIB_H -#include <stdlib.h> -#endif -#include <errno.h> -#include <limits.h> -#include <stdio.h> -#include <string.h> -#ifdef _EVENT_HAVE_NETINET_IN_H -#include <netinet/in.h> -#endif -#ifdef _EVENT_HAVE_NETINET_IN6_H -#include <netinet/in6.h> -#endif -#ifdef _EVENT_HAVE_ARPA_INET_H -#include <arpa/inet.h> -#endif - -#ifndef _EVENT_HAVE_GETTIMEOFDAY -#include <sys/timeb.h> -#include <time.h> -#endif -#include <sys/stat.h> - -#include "event2/util.h" -#include "util-internal.h" -#include "log-internal.h" -#include "mm-internal.h" - -#include "strlcpy-internal.h" -#include "ipv6-internal.h" - -#ifdef WIN32 -#define open _open -#define read _read -#define close _close -#define fstat _fstati64 -#define stat _stati64 -#define mode_t int -#endif - -int -evutil_open_closeonexec(const char *pathname, int flags, unsigned mode) -{ - int fd; - -#ifdef O_CLOEXEC - flags |= O_CLOEXEC; -#endif - - if (flags & O_CREAT) - fd = open(pathname, flags, (mode_t)mode); - else - fd = open(pathname, flags); - if (fd < 0) - return -1; - -#if !defined(O_CLOEXEC) && defined(FD_CLOEXEC) - if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) - return -1; -#endif - - return fd; -} - -/** - Read the contents of 'filename' into a newly allocated NUL-terminated - string. Set *content_out to hold this string, and *len_out to hold its - length (not including the appended NUL). If 'is_binary', open the file in - binary mode. - - Returns 0 on success, -1 if the open fails, and -2 for all other failures. - - Used internally only; may go away in a future version. - */ -int -evutil_read_file(const char *filename, char **content_out, size_t *len_out, - int is_binary) -{ - int fd, r; - struct stat st; - char *mem; - size_t read_so_far=0; - int mode = O_RDONLY; - - EVUTIL_ASSERT(content_out); - EVUTIL_ASSERT(len_out); - *content_out = NULL; - *len_out = 0; - -#ifdef O_BINARY - if (is_binary) - mode |= O_BINARY; -#endif - - fd = evutil_open_closeonexec(filename, mode, 0); - if (fd < 0) - return -1; - if (fstat(fd, &st) || st.st_size < 0 || - st.st_size > EV_SSIZE_MAX-1 ) { - close(fd); - return -2; - } - mem = mm_malloc((size_t)st.st_size + 1); - if (!mem) { - close(fd); - return -2; - } - read_so_far = 0; -#ifdef WIN32 -#define N_TO_READ(x) ((x) > INT_MAX) ? INT_MAX : ((int)(x)) -#else -#define N_TO_READ(x) (x) -#endif - while ((r = read(fd, mem+read_so_far, N_TO_READ(st.st_size - read_so_far))) > 0) { - read_so_far += r; - if (read_so_far >= (size_t)st.st_size) - break; - EVUTIL_ASSERT(read_so_far < (size_t)st.st_size); - } - close(fd); - if (r < 0) { - mm_free(mem); - return -2; - } - mem[read_so_far] = 0; - - *len_out = read_so_far; - *content_out = mem; - return 0; -} - -int -evutil_socketpair(int family, int type, int protocol, evutil_socket_t fd[2]) -{ -#ifndef WIN32 - return socketpair(family, type, protocol, fd); -#else - return evutil_ersatz_socketpair(family, type, protocol, fd); -#endif -} - -int -evutil_ersatz_socketpair(int family, int type, int protocol, - evutil_socket_t fd[2]) -{ - /* This code is originally from Tor. Used with permission. */ - - /* This socketpair does not work when localhost is down. So - * it's really not the same thing at all. But it's close enough - * for now, and really, when localhost is down sometimes, we - * have other problems too. - */ -#ifdef WIN32 -#define ERR(e) WSA##e -#else -#define ERR(e) e -#endif - evutil_socket_t listener = -1; - evutil_socket_t connector = -1; - evutil_socket_t acceptor = -1; - struct sockaddr_in listen_addr; - struct sockaddr_in connect_addr; - ev_socklen_t size; - int saved_errno = -1; - - if (protocol - || (family != AF_INET -#ifdef AF_UNIX - && family != AF_UNIX -#endif - )) { - EVUTIL_SET_SOCKET_ERROR(ERR(EAFNOSUPPORT)); - return -1; - } - if (!fd) { - EVUTIL_SET_SOCKET_ERROR(ERR(EINVAL)); - return -1; - } - - listener = socket(AF_INET, type, 0); - if (listener < 0) - return -1; - memset(&listen_addr, 0, sizeof(listen_addr)); - listen_addr.sin_family = AF_INET; - listen_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - listen_addr.sin_port = 0; /* kernel chooses port. */ - if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr)) - == -1) - goto tidy_up_and_fail; - if (listen(listener, 1) == -1) - goto tidy_up_and_fail; - - connector = socket(AF_INET, type, 0); - if (connector < 0) - goto tidy_up_and_fail; - /* We want to find out the port number to connect to. */ - size = sizeof(connect_addr); - if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1) - goto tidy_up_and_fail; - if (size != sizeof (connect_addr)) - goto abort_tidy_up_and_fail; - if (connect(connector, (struct sockaddr *) &connect_addr, - sizeof(connect_addr)) == -1) - goto tidy_up_and_fail; - - size = sizeof(listen_addr); - acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size); - if (acceptor < 0) - goto tidy_up_and_fail; - if (size != sizeof(listen_addr)) - goto abort_tidy_up_and_fail; - /* Now check we are talking to ourself by matching port and host on the - two sockets. */ - if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1) - goto tidy_up_and_fail; - if (size != sizeof (connect_addr) - || listen_addr.sin_family != connect_addr.sin_family - || listen_addr.sin_addr.s_addr != connect_addr.sin_addr.s_addr - || listen_addr.sin_port != connect_addr.sin_port) - goto abort_tidy_up_and_fail; - evutil_closesocket(listener); - fd[0] = connector; - fd[1] = acceptor; - - return 0; - - abort_tidy_up_and_fail: - saved_errno = ERR(ECONNABORTED); - tidy_up_and_fail: - if (saved_errno < 0) - saved_errno = EVUTIL_SOCKET_ERROR(); - if (listener != -1) - evutil_closesocket(listener); - if (connector != -1) - evutil_closesocket(connector); - if (acceptor != -1) - evutil_closesocket(acceptor); - - EVUTIL_SET_SOCKET_ERROR(saved_errno); - return -1; -#undef ERR -} - -int -evutil_make_socket_nonblocking(evutil_socket_t fd) -{ -#ifdef WIN32 - { - u_long nonblocking = 1; - if (ioctlsocket(fd, FIONBIO, &nonblocking) == SOCKET_ERROR) { - event_sock_warn(fd, "fcntl(%d, F_GETFL)", (int)fd); - return -1; - } - } -#else - { - int flags; - if ((flags = fcntl(fd, F_GETFL, NULL)) < 0) { - event_warn("fcntl(%d, F_GETFL)", fd); - return -1; - } - if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) { - event_warn("fcntl(%d, F_SETFL)", fd); - return -1; - } - } -#endif - return 0; -} - -int -evutil_make_listen_socket_reuseable(evutil_socket_t sock) -{ -#ifndef WIN32 - int one = 1; - /* REUSEADDR on Unix means, "don't hang on to this address after the - * listener is closed." On Windows, though, it means "don't keep other - * processes from binding to this address while we're using it. */ - return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &one, - (ev_socklen_t)sizeof(one)); -#else - return 0; -#endif -} - -int -evutil_make_socket_closeonexec(evutil_socket_t fd) -{ -#if !defined(WIN32) && defined(_EVENT_HAVE_SETFD) - int flags; - if ((flags = fcntl(fd, F_GETFD, NULL)) < 0) { - event_warn("fcntl(%d, F_GETFD)", fd); - return -1; - } - if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) { - event_warn("fcntl(%d, F_SETFD)", fd); - return -1; - } -#endif - return 0; -} - -int -evutil_closesocket(evutil_socket_t sock) -{ -#ifndef WIN32 - return close(sock); -#else - return closesocket(sock); -#endif -} - -ev_int64_t -evutil_strtoll(const char *s, char **endptr, int base) -{ -#ifdef _EVENT_HAVE_STRTOLL - return (ev_int64_t)strtoll(s, endptr, base); -#elif _EVENT_SIZEOF_LONG == 8 - return (ev_int64_t)strtol(s, endptr, base); -#elif defined(WIN32) && defined(_MSC_VER) && _MSC_VER < 1300 - /* XXXX on old versions of MS APIs, we only support base - * 10. */ - ev_int64_t r; - if (base != 10) - return 0; - r = (ev_int64_t) _atoi64(s); - while (isspace(*s)) - ++s; - if (*s == '-') - ++s; - while (isdigit(*s)) - ++s; - if (endptr) - *endptr = (char*) s; - return r; -#elif defined(WIN32) - return (ev_int64_t) _strtoi64(s, endptr, base); -#elif defined(_EVENT_SIZEOF_LONG_LONG) && _EVENT_SIZEOF_LONG_LONG == 8 - long long r; - int n; - if (base != 10 && base != 16) - return 0; - if (base == 10) { - n = sscanf(s, "%lld", &r); - } else { - unsigned long long ru=0; - n = sscanf(s, "%llx", &ru); - if (ru > EV_INT64_MAX) - return 0; - r = (long long) ru; - } - if (n != 1) - return 0; - while (EVUTIL_ISSPACE(*s)) - ++s; - if (*s == '-') - ++s; - if (base == 10) { - while (EVUTIL_ISDIGIT(*s)) - ++s; - } else { - while (EVUTIL_ISXDIGIT(*s)) - ++s; - } - if (endptr) - *endptr = (char*) s; - return r; -#else -#error "I don't know how to parse 64-bit integers." -#endif -} - -#ifndef _EVENT_HAVE_GETTIMEOFDAY -/* No gettimeofday; this muse be windows. */ -int -evutil_gettimeofday(struct timeval *tv, struct timezone *tz) -{ - struct _timeb tb; - - if (tv == NULL) - return -1; - - /* XXXX - * _ftime is not the greatest interface here; GetSystemTimeAsFileTime - * would give us better resolution, whereas something cobbled together - * with GetTickCount could maybe give us monotonic behavior. - * - * Either way, I think this value might be skewed to ignore the - * timezone, and just return local time. That's not so good. - */ - _ftime(&tb); - tv->tv_sec = (long) tb.time; - tv->tv_usec = ((int) tb.millitm) * 1000; - return 0; -} -#endif - -#ifdef WIN32 -int -evutil_socket_geterror(evutil_socket_t sock) -{ - int optval, optvallen=sizeof(optval); - int err = WSAGetLastError(); - if (err == WSAEWOULDBLOCK && sock >= 0) { - if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)&optval, - &optvallen)) - return err; - if (optval) - return optval; - } - return err; -} -#endif - -/* XXX we should use an enum here. */ -/* 2 for connection refused, 1 for connected, 0 for not yet, -1 for error. */ -int -evutil_socket_connect(evutil_socket_t *fd_ptr, struct sockaddr *sa, int socklen) -{ - int made_fd = 0; - - if (*fd_ptr < 0) { - if ((*fd_ptr = socket(sa->sa_family, SOCK_STREAM, 0)) < 0) - goto err; - made_fd = 1; - if (evutil_make_socket_nonblocking(*fd_ptr) < 0) { - goto err; - } - } - - if (connect(*fd_ptr, sa, socklen) < 0) { - int e = evutil_socket_geterror(*fd_ptr); - if (EVUTIL_ERR_CONNECT_RETRIABLE(e)) - return 0; - if (EVUTIL_ERR_CONNECT_REFUSED(e)) - return 2; - goto err; - } else { - return 1; - } - -err: - if (made_fd) { - evutil_closesocket(*fd_ptr); - *fd_ptr = -1; - } - return -1; -} - -/* Check whether a socket on which we called connect() is done - connecting. Return 1 for connected, 0 for not yet, -1 for error. In the - error case, set the current socket errno to the error that happened during - the connect operation. */ -int -evutil_socket_finished_connecting(evutil_socket_t fd) -{ - int e; - ev_socklen_t elen = sizeof(e); - - if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&e, &elen) < 0) - return -1; - - if (e) { - if (EVUTIL_ERR_CONNECT_RETRIABLE(e)) - return 0; - EVUTIL_SET_SOCKET_ERROR(e); - return -1; - } - - return 1; -} - -#if (EVUTIL_AI_PASSIVE|EVUTIL_AI_CANONNAME|EVUTIL_AI_NUMERICHOST| \ - EVUTIL_AI_NUMERICSERV|EVUTIL_AI_V4MAPPED|EVUTIL_AI_ALL| \ - EVUTIL_AI_ADDRCONFIG) != \ - (EVUTIL_AI_PASSIVE^EVUTIL_AI_CANONNAME^EVUTIL_AI_NUMERICHOST^ \ - EVUTIL_AI_NUMERICSERV^EVUTIL_AI_V4MAPPED^EVUTIL_AI_ALL^ \ - EVUTIL_AI_ADDRCONFIG) -#error "Some of our EVUTIL_AI_* flags seem to overlap with system AI_* flags" -#endif - -/* We sometimes need to know whether we have an ipv4 address and whether we - have an ipv6 address. If 'have_checked_interfaces', then we've already done - the test. If 'had_ipv4_address', then it turns out we had an ipv4 address. - If 'had_ipv6_address', then it turns out we had an ipv6 address. These are - set by evutil_check_interfaces. */ -static int have_checked_interfaces, had_ipv4_address, had_ipv6_address; - -/* Macro: True iff the IPv4 address 'addr', in host order, is in 127.0.0.0/8 - */ -#define EVUTIL_V4ADDR_IS_LOCALHOST(addr) (((addr)>>24) == 127) - -/* Macro: True iff the IPv4 address 'addr', in host order, is a class D - * (multiclass) address. - */ -#define EVUTIL_V4ADDR_IS_CLASSD(addr) ((((addr)>>24) & 0xf0) == 0xe0) - -/* Test whether we have an ipv4 interface and an ipv6 interface. Return 0 if - * the test seemed successful. */ -static int -evutil_check_interfaces(int force_recheck) -{ - const char ZEROES[] = "\x00\x00\x00\x00\x00\x00\x00\x00" - "\x00\x00\x00\x00\x00\x00\x00\x00"; - evutil_socket_t fd = -1; - struct sockaddr_in sin, sin_out; - struct sockaddr_in6 sin6, sin6_out; - ev_socklen_t sin_out_len = sizeof(sin_out); - ev_socklen_t sin6_out_len = sizeof(sin6_out); - int r; - char buf[128]; - if (have_checked_interfaces && !force_recheck) - return 0; - - /* To check whether we have an interface open for a given protocol, we - * try to make a UDP 'connection' to a remote host on the internet. - * We don't actually use it, so the address doesn't matter, but we - * want to pick one that keep us from using a host- or link-local - * interface. */ - memset(&sin, 0, sizeof(sin)); - sin.sin_family = AF_INET; - sin.sin_port = htons(53); - r = evutil_inet_pton(AF_INET, "18.244.0.188", &sin.sin_addr); - EVUTIL_ASSERT(r); - - memset(&sin6, 0, sizeof(sin6)); - sin6.sin6_family = AF_INET6; - sin6.sin6_port = htons(53); - r = evutil_inet_pton(AF_INET6, "2001:4860:b002::68", &sin6.sin6_addr); - EVUTIL_ASSERT(r); - - memset(&sin_out, 0, sizeof(sin_out)); - memset(&sin6_out, 0, sizeof(sin6_out)); - - /* XXX some errnos mean 'no address'; some mean 'not enough sockets'. */ - if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) >= 0 && - connect(fd, (struct sockaddr*)&sin, sizeof(sin)) == 0 && - getsockname(fd, (struct sockaddr*)&sin_out, &sin_out_len) == 0) { - /* We might have an IPv4 interface. */ - ev_uint32_t addr = ntohl(sin_out.sin_addr.s_addr); - if (addr == 0 || - EVUTIL_V4ADDR_IS_LOCALHOST(addr) || - EVUTIL_V4ADDR_IS_CLASSD(addr)) { - evutil_inet_ntop(AF_INET, &sin_out.sin_addr, - buf, sizeof(buf)); - /* This is a reserved, ipv4compat, ipv4map, loopback, - * link-local or unspecified address. The host should - * never have given it to us; it could never connect - * to sin. */ - event_warnx("Got a strange local ipv4 address %s",buf); - } else { - event_debug(("Detected an IPv4 interface")); - had_ipv4_address = 1; - } - } - if (fd >= 0) - evutil_closesocket(fd); - - if ((fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) >= 0 && - connect(fd, (struct sockaddr*)&sin6, sizeof(sin6)) == 0 && - getsockname(fd, (struct sockaddr*)&sin6_out, &sin6_out_len) == 0) { - /* We might have an IPv6 interface. */ - const unsigned char *addr = - (unsigned char*)sin6_out.sin6_addr.s6_addr; - if (!memcmp(addr, ZEROES, 8) || - (addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80)) { - /* This is a reserved, ipv4compat, ipv4map, loopback, - * link-local or unspecified address. The host should - * never have given it to us; it could never connect - * to sin6. */ - evutil_inet_ntop(AF_INET6, &sin6_out.sin6_addr, - buf, sizeof(buf)); - event_warnx("Got a strange local ipv6 address %s",buf); - } else { - event_debug(("Detected an IPv4 interface")); - had_ipv6_address = 1; - } - } - - if (fd >= 0) - evutil_closesocket(fd); - - return 0; -} - -/* Internal addrinfo flag. This one is set when we allocate the addrinfo from - * inside libevent. Otherwise, the built-in getaddrinfo() function allocated - * it, and we should trust what they said. - **/ -#define EVUTIL_AI_LIBEVENT_ALLOCATED 0x80000000 - -/* Helper: construct a new addrinfo containing the socket address in - * 'sa', which must be a sockaddr_in or a sockaddr_in6. Take the - * socktype and protocol info from hints. If they weren't set, then - * allocate both a TCP and a UDP addrinfo. - */ -struct evutil_addrinfo * -evutil_new_addrinfo(struct sockaddr *sa, ev_socklen_t socklen, - const struct evutil_addrinfo *hints) -{ - struct evutil_addrinfo *res; - EVUTIL_ASSERT(hints); - - if (hints->ai_socktype == 0 && hints->ai_protocol == 0) { - /* Indecisive user! Give them a UDP and a TCP. */ - struct evutil_addrinfo *r1, *r2; - struct evutil_addrinfo tmp; - memcpy(&tmp, hints, sizeof(tmp)); - tmp.ai_socktype = SOCK_STREAM; tmp.ai_protocol = IPPROTO_TCP; - r1 = evutil_new_addrinfo(sa, socklen, &tmp); - if (!r1) - return NULL; - tmp.ai_socktype = SOCK_DGRAM; tmp.ai_protocol = IPPROTO_UDP; - r2 = evutil_new_addrinfo(sa, socklen, &tmp); - if (!r2) { - evutil_freeaddrinfo(r1); - return NULL; - } - r1->ai_next = r2; - return r1; - } - - /* We're going to allocate extra space to hold the sockaddr. */ - res = mm_calloc(1,sizeof(struct evutil_addrinfo)+socklen); - if (!res) - return NULL; - res->ai_addr = (struct sockaddr*) - (((char*)res) + sizeof(struct evutil_addrinfo)); - memcpy(res->ai_addr, sa, socklen); - res->ai_addrlen = socklen; - res->ai_family = sa->sa_family; /* Same or not? XXX */ - res->ai_flags = EVUTIL_AI_LIBEVENT_ALLOCATED; - res->ai_socktype = hints->ai_socktype; - res->ai_protocol = hints->ai_protocol; - - return res; -} - -/* Append the addrinfo 'append' to the end of 'first', and return the start of - * the list. Either element can be NULL, in which case we return the element - * that is not NULL. */ -struct evutil_addrinfo * -evutil_addrinfo_append(struct evutil_addrinfo *first, - struct evutil_addrinfo *append) -{ - struct evutil_addrinfo *ai = first; - if (!ai) - return append; - while (ai->ai_next) - ai = ai->ai_next; - ai->ai_next = append; - - return first; -} - -static int -parse_numeric_servname(const char *servname) -{ - int n; - char *endptr=NULL; - n = (int) strtol(servname, &endptr, 10); - if (n>=0 && n <= 65535 && servname[0] && endptr && !endptr[0]) - return n; - else - return -1; -} - -/** Parse a service name in 'servname', which can be a decimal port. - * Return the port number, or -1 on error. - */ -static int -evutil_parse_servname(const char *servname, const char *protocol, - const struct evutil_addrinfo *hints) -{ - int n = parse_numeric_servname(servname); - if (n>=0) - return n; -#if defined(_EVENT_HAVE_GETSERVBYNAME) || defined(WIN32) - if (!(hints->ai_flags & EVUTIL_AI_NUMERICSERV)) { - struct servent *ent = getservbyname(servname, protocol); - if (ent) { - return ntohs(ent->s_port); - } - } -#endif - return -1; -} - -/* Return a string corresponding to a protocol number that we can pass to - * getservyname. */ -static const char * -evutil_unparse_protoname(int proto) -{ - switch (proto) { - case 0: - return NULL; - case IPPROTO_TCP: - return "tcp"; - case IPPROTO_UDP: - return "udp"; -#ifdef IPPROTO_SCTP - case IPPROTO_SCTP: - return "sctp"; -#endif - default: -#ifdef _EVENT_HAVE_GETPROTOBYNUMBER - { - struct protoent *ent = getprotobynumber(proto); - if (ent) - return ent->p_name; - } -#endif - return NULL; - } -} - -static void -evutil_getaddrinfo_infer_protocols(struct evutil_addrinfo *hints) -{ - /* If we can guess the protocol from the socktype, do so. */ - if (!hints->ai_protocol && hints->ai_socktype) { - if (hints->ai_socktype == SOCK_DGRAM) - hints->ai_protocol = IPPROTO_UDP; - else if (hints->ai_socktype == SOCK_STREAM) - hints->ai_protocol = IPPROTO_TCP; - } - - /* Set the socktype if it isn't set. */ - if (!hints->ai_socktype && hints->ai_protocol) { - if (hints->ai_protocol == IPPROTO_UDP) - hints->ai_socktype = SOCK_DGRAM; - else if (hints->ai_protocol == IPPROTO_TCP) - hints->ai_socktype = SOCK_STREAM; -#ifdef IPPROTO_SCTP - else if (hints->ai_protocol == IPPROTO_SCTP) - hints->ai_socktype = SOCK_STREAM; -#endif - } -} - -#if AF_UNSPEC != PF_UNSPEC -#error "I cannot build on a system where AF_UNSPEC != PF_UNSPEC" -#endif - -/** Implements the part of looking up hosts by name that's common to both - * the blocking and nonblocking resolver: - * - Adjust 'hints' to have a reasonable socktype and protocol. - * - Look up the port based on 'servname', and store it in *portnum, - * - Handle the nodename==NULL case - * - Handle some invalid arguments cases. - * - Handle the cases where nodename is an IPv4 or IPv6 address. - * - * If we need the resolver to look up the hostname, we return - * EVUTIL_EAI_NEED_RESOLVE. Otherwise, we can completely implement - * getaddrinfo: we return 0 or an appropriate EVUTIL_EAI_* error, and - * set *res as getaddrinfo would. - */ -int -evutil_getaddrinfo_common(const char *nodename, const char *servname, - struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum) -{ - int port = 0; - const char *pname; - - if (nodename == NULL && servname == NULL) - return EVUTIL_EAI_NONAME; - - /* We only understand 3 families */ - if (hints->ai_family != PF_UNSPEC && hints->ai_family != PF_INET && - hints->ai_family != PF_INET6) - return EVUTIL_EAI_FAMILY; - - evutil_getaddrinfo_infer_protocols(hints); - - /* Look up the port number and protocol, if possible. */ - pname = evutil_unparse_protoname(hints->ai_protocol); - if (servname) { - /* XXXX We could look at the protocol we got back from - * getservbyname, but it doesn't seem too useful. */ - port = evutil_parse_servname(servname, pname, hints); - if (port < 0) { - return EVUTIL_EAI_NONAME; - } - } - - /* If we have no node name, then we're supposed to bind to 'any' and - * connect to localhost. */ - if (nodename == NULL) { - struct evutil_addrinfo *res4=NULL, *res6=NULL; - if (hints->ai_family != PF_INET) { /* INET6 or UNSPEC. */ - struct sockaddr_in6 sin6; - memset(&sin6, 0, sizeof(sin6)); - sin6.sin6_family = AF_INET6; - sin6.sin6_port = htons(port); - if (hints->ai_flags & EVUTIL_AI_PASSIVE) { - /* Bind to :: */ - } else { - /* connect to ::1 */ - sin6.sin6_addr.s6_addr[15] = 1; - } - res6 = evutil_new_addrinfo((struct sockaddr*)&sin6, - sizeof(sin6), hints); - if (!res6) - return EVUTIL_EAI_MEMORY; - } - - if (hints->ai_family != PF_INET6) { /* INET or UNSPEC */ - struct sockaddr_in sin; - memset(&sin, 0, sizeof(sin)); - sin.sin_family = AF_INET; - sin.sin_port = htons(port); - if (hints->ai_flags & EVUTIL_AI_PASSIVE) { - /* Bind to 0.0.0.0 */ - } else { - /* connect to 127.0.0.1 */ - sin.sin_addr.s_addr = htonl(0x7f000001); - } - res4 = evutil_new_addrinfo((struct sockaddr*)&sin, - sizeof(sin), hints); - if (!res4) { - if (res6) - evutil_freeaddrinfo(res6); - return EVUTIL_EAI_MEMORY; - } - } - *res = evutil_addrinfo_append(res4, res6); - return 0; - } - - /* If we can, we should try to parse the hostname without resolving - * it. */ - /* Try ipv6. */ - if (hints->ai_family == PF_INET6 || hints->ai_family == PF_UNSPEC) { - struct sockaddr_in6 sin6; - memset(&sin6, 0, sizeof(sin6)); - if (1==evutil_inet_pton(AF_INET6, nodename, &sin6.sin6_addr)) { - /* Got an ipv6 address. */ - sin6.sin6_family = AF_INET6; - sin6.sin6_port = htons(port); - *res = evutil_new_addrinfo((struct sockaddr*)&sin6, - sizeof(sin6), hints); - if (!*res) - return EVUTIL_EAI_MEMORY; - return 0; - } - } - - /* Try ipv4. */ - if (hints->ai_family == PF_INET || hints->ai_family == PF_UNSPEC) { - struct sockaddr_in sin; - memset(&sin, 0, sizeof(sin)); - if (1==evutil_inet_pton(AF_INET, nodename, &sin.sin_addr)) { - /* Got an ipv6 address. */ - sin.sin_family = AF_INET; - sin.sin_port = htons(port); - *res = evutil_new_addrinfo((struct sockaddr*)&sin, - sizeof(sin), hints); - if (!*res) - return EVUTIL_EAI_MEMORY; - return 0; - } - } - - - /* If we have reached this point, we definitely need to do a DNS - * lookup. */ - if ((hints->ai_flags & EVUTIL_AI_NUMERICHOST)) { - /* If we're not allowed to do one, then say so. */ - return EVUTIL_EAI_NONAME; - } - *portnum = port; - return EVUTIL_EAI_NEED_RESOLVE; -} - -#ifdef _EVENT_HAVE_GETADDRINFO -#define USE_NATIVE_GETADDRINFO -#endif - -#ifdef USE_NATIVE_GETADDRINFO -/* A mask of all the flags that we declare, so we can clear them before calling - * the native getaddrinfo */ -static const unsigned int ALL_NONNATIVE_AI_FLAGS = -#ifndef AI_PASSIVE - EVUTIL_AI_PASSIVE | -#endif -#ifndef AI_CANONNAME - EVUTIL_AI_CANONNAME | -#endif -#ifndef AI_NUMERICHOST - EVUTIL_AI_NUMERICHOST | -#endif -#ifndef AI_NUMERICSERV - EVUTIL_AI_NUMERICSERV | -#endif -#ifndef AI_ADDRCONFIG - EVUTIL_AI_ADDRCONFIG | -#endif -#ifndef AI_ALL - EVUTIL_AI_ALL | -#endif -#ifndef AI_V4MAPPED - EVUTIL_AI_V4MAPPED | -#endif - EVUTIL_AI_LIBEVENT_ALLOCATED; - -static const unsigned int ALL_NATIVE_AI_FLAGS = -#ifdef AI_PASSIVE - AI_PASSIVE | -#endif -#ifdef AI_CANONNAME - AI_CANONNAME | -#endif -#ifdef AI_NUMERICHOST - AI_NUMERICHOST | -#endif -#ifdef AI_NUMERICSERV - AI_NUMERICSERV | -#endif -#ifdef AI_ADDRCONFIG - AI_ADDRCONFIG | -#endif -#ifdef AI_ALL - AI_ALL | -#endif -#ifdef AI_V4MAPPED - AI_V4MAPPED | -#endif - 0; -#endif - -#ifndef USE_NATIVE_GETADDRINFO -/* Helper for systems with no getaddrinfo(): make one or more addrinfos out of - * a struct hostent. - */ -static struct evutil_addrinfo * -addrinfo_from_hostent(const struct hostent *ent, - int port, const struct evutil_addrinfo *hints) -{ - int i; - struct sockaddr_in sin; - struct sockaddr_in6 sin6; - struct sockaddr *sa; - int socklen; - struct evutil_addrinfo *res=NULL, *ai; - void *addrp; - - if (ent->h_addrtype == PF_INET) { - memset(&sin, 0, sizeof(sin)); - sin.sin_family = AF_INET; - sin.sin_port = htons(port); - sa = (struct sockaddr *)&sin; - socklen = sizeof(struct sockaddr_in); - addrp = &sin.sin_addr; - if (ent->h_length != sizeof(sin.sin_addr)) { - event_warnx("Weird h_length from gethostbyname"); - return NULL; - } - } else if (ent->h_addrtype == PF_INET6) { - memset(&sin6, 0, sizeof(sin6)); - sin6.sin6_family = AF_INET6; - sin6.sin6_port = htons(port); - sa = (struct sockaddr *)&sin6; - socklen = sizeof(struct sockaddr_in); - addrp = &sin6.sin6_addr; - if (ent->h_length != sizeof(sin6.sin6_addr)) { - event_warnx("Weird h_length from gethostbyname"); - return NULL; - } - } else - return NULL; - - for (i = 0; ent->h_addr_list[i]; ++i) { - memcpy(addrp, ent->h_addr_list[i], ent->h_length); - ai = evutil_new_addrinfo(sa, socklen, hints); - if (!ai) { - evutil_freeaddrinfo(res); - return NULL; - } - res = evutil_addrinfo_append(res, ai); - } - - if (res && ((hints->ai_flags & EVUTIL_AI_CANONNAME) && ent->h_name)) { - res->ai_canonname = mm_strdup(ent->h_name); - if (res->ai_canonname == NULL) { - evutil_freeaddrinfo(res); - return NULL; - } - } - - return res; -} -#endif - -/* If the EVUTIL_AI_ADDRCONFIG flag is set on hints->ai_flags, and - * hints->ai_family is PF_UNSPEC, then revise the value of hints->ai_family so - * that we'll only get addresses we could maybe connect to. - */ -void -evutil_adjust_hints_for_addrconfig(struct evutil_addrinfo *hints) -{ - if (!(hints->ai_flags & EVUTIL_AI_ADDRCONFIG)) - return; - if (hints->ai_family != PF_UNSPEC) - return; - if (!have_checked_interfaces) - evutil_check_interfaces(0); - if (had_ipv4_address && !had_ipv6_address) { - hints->ai_family = PF_INET; - } else if (!had_ipv4_address && had_ipv6_address) { - hints->ai_family = PF_INET6; - } -} - -#ifdef USE_NATIVE_GETADDRINFO -static int need_numeric_port_hack_=0; -static int need_socktype_protocol_hack_=0; -static int tested_for_getaddrinfo_hacks=0; - -/* Some older BSDs (like OpenBSD up to 4.6) used to believe that - giving a numeric port without giving an ai_socktype was verboten. - We test for this so we can apply an appropriate workaround. If it - turns out that the bug is present, then: - - - If nodename==NULL and servname is numeric, we build an answer - ourselves using evutil_getaddrinfo_common(). - - - If nodename!=NULL and servname is numeric, then we set - servname=NULL when calling getaddrinfo, and post-process the - result to set the ports on it. - - We test for this bug at runtime, since otherwise we can't have the - same binary run on multiple BSD versions. - - - Some versions of Solaris believe that it's nice to leave to protocol - field set to 0. We test for this so we can apply an appropriate - workaround. -*/ -static void -test_for_getaddrinfo_hacks(void) -{ - int r, r2; - struct evutil_addrinfo *ai=NULL, *ai2=NULL; - struct evutil_addrinfo hints; - - memset(&hints,0,sizeof(hints)); - hints.ai_family = PF_UNSPEC; - hints.ai_flags = -#ifdef AI_NUMERICHOST - AI_NUMERICHOST | -#endif -#ifdef AI_NUMERICSERV - AI_NUMERICSERV | -#endif - 0; - r = getaddrinfo("1.2.3.4", "80", &hints, &ai); - hints.ai_socktype = SOCK_STREAM; - r2 = getaddrinfo("1.2.3.4", "80", &hints, &ai2); - if (r2 == 0 && r != 0) { - need_numeric_port_hack_=1; - } - if (ai2 && ai2->ai_protocol == 0) { - need_socktype_protocol_hack_=1; - } - - if (ai) - freeaddrinfo(ai); - if (ai2) - freeaddrinfo(ai2); - tested_for_getaddrinfo_hacks=1; -} - -static inline int -need_numeric_port_hack(void) -{ - if (!tested_for_getaddrinfo_hacks) - test_for_getaddrinfo_hacks(); - return need_numeric_port_hack_; -} - -static inline int -need_socktype_protocol_hack(void) -{ - if (!tested_for_getaddrinfo_hacks) - test_for_getaddrinfo_hacks(); - return need_socktype_protocol_hack_; -} - -static void -apply_numeric_port_hack(int port, struct evutil_addrinfo **ai) -{ - /* Now we run through the list and set the ports on all of the - * results where ports would make sense. */ - for ( ; *ai; ai = &(*ai)->ai_next) { - struct sockaddr *sa = (*ai)->ai_addr; - if (sa && sa->sa_family == AF_INET) { - struct sockaddr_in *sin = (struct sockaddr_in*)sa; - sin->sin_port = htons(port); - } else if (sa && sa->sa_family == AF_INET6) { - struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa; - sin6->sin6_port = htons(port); - } else { - /* A numeric port makes no sense here; remove this one - * from the list. */ - struct evutil_addrinfo *victim = *ai; - *ai = victim->ai_next; - victim->ai_next = NULL; - freeaddrinfo(victim); - } - } -} - -static int -apply_socktype_protocol_hack(struct evutil_addrinfo *ai) -{ - struct evutil_addrinfo *ai_new; - for (; ai; ai = ai->ai_next) { - evutil_getaddrinfo_infer_protocols(ai); - if (ai->ai_socktype || ai->ai_protocol) - continue; - ai_new = mm_malloc(sizeof(*ai_new)); - if (!ai_new) - return -1; - memcpy(ai_new, ai, sizeof(*ai_new)); - ai->ai_socktype = SOCK_STREAM; - ai->ai_protocol = IPPROTO_TCP; - ai_new->ai_socktype = SOCK_DGRAM; - ai_new->ai_protocol = IPPROTO_UDP; - - ai_new->ai_next = ai->ai_next; - ai->ai_next = ai_new; - } - return 0; -} -#endif - -int -evutil_getaddrinfo(const char *nodename, const char *servname, - const struct evutil_addrinfo *hints_in, struct evutil_addrinfo **res) -{ -#ifdef USE_NATIVE_GETADDRINFO - struct evutil_addrinfo hints; - int portnum=-1, need_np_hack, err; - - if (hints_in) { - memcpy(&hints, hints_in, sizeof(hints)); - } else { - memset(&hints, 0, sizeof(hints)); - hints.ai_family = PF_UNSPEC; - } - -#ifndef AI_ADDRCONFIG - /* Not every system has AI_ADDRCONFIG, so fake it. */ - if (hints.ai_family == PF_UNSPEC && - (hints.ai_flags & EVUTIL_AI_ADDRCONFIG)) { - evutil_adjust_hints_for_addrconfig(&hints); - } -#endif - -#ifndef AI_NUMERICSERV - /* Not every system has AI_NUMERICSERV, so fake it. */ - if (hints.ai_flags & EVUTIL_AI_NUMERICSERV) { - if (servname && parse_numeric_servname(servname)<0) - return EVUTIL_EAI_NONAME; - } -#endif - - /* Enough operating systems handle enough common non-resolve - * cases here weirdly enough that we are better off just - * overriding them. For example: - * - * - Windows doesn't like to infer the protocol from the - * socket type, or fill in socket or protocol types much at - * all. It also seems to do its own broken implicit - * always-on version of AI_ADDRCONFIG that keeps it from - * ever resolving even a literal IPv6 address when - * ai_addrtype is PF_UNSPEC. - */ -#ifdef WIN32 - { - int tmp_port; - err = evutil_getaddrinfo_common(nodename,servname,&hints, - res, &tmp_port); - if (err == 0 || - err == EVUTIL_EAI_MEMORY || - err == EVUTIL_EAI_NONAME) - return err; - /* If we make it here, the system getaddrinfo can - * have a crack at it. */ - } -#endif - - /* See documentation for need_numeric_port_hack above.*/ - need_np_hack = need_numeric_port_hack() && servname && !hints.ai_socktype - && ((portnum=parse_numeric_servname(servname)) >= 0); - if (need_np_hack) { - if (!nodename) - return evutil_getaddrinfo_common( - NULL,servname,&hints, res, &portnum); - servname = NULL; - } - - if (need_socktype_protocol_hack()) { - evutil_getaddrinfo_infer_protocols(&hints); - } - - /* Make sure that we didn't actually steal any AI_FLAGS values that - * the system is using. (This is a constant expression, and should ge - * optimized out.) - * - * XXXX Turn this into a compile-time failure rather than a run-time - * failure. - */ - EVUTIL_ASSERT((ALL_NONNATIVE_AI_FLAGS & ALL_NATIVE_AI_FLAGS) == 0); - - /* Clear any flags that only libevent understands. */ - hints.ai_flags &= ~ALL_NONNATIVE_AI_FLAGS; - - err = getaddrinfo(nodename, servname, &hints, res); - if (need_np_hack) - apply_numeric_port_hack(portnum, res); - - if (need_socktype_protocol_hack()) { - if (apply_socktype_protocol_hack(*res) < 0) { - evutil_freeaddrinfo(*res); - *res = NULL; - return EVUTIL_EAI_MEMORY; - } - } - return err; -#else - int port=0, err; - struct hostent *ent = NULL; - struct evutil_addrinfo hints; - - if (hints_in) { - memcpy(&hints, hints_in, sizeof(hints)); - } else { - memset(&hints, 0, sizeof(hints)); - hints.ai_family = PF_UNSPEC; - } - - evutil_adjust_hints_for_addrconfig(&hints); - - err = evutil_getaddrinfo_common(nodename, servname, &hints, res, &port); - if (err != EVUTIL_EAI_NEED_RESOLVE) { - /* We either succeeded or failed. No need to continue */ - return err; - } - - err = 0; - /* Use any of the various gethostbyname_r variants as available. */ - { -#ifdef _EVENT_HAVE_GETHOSTBYNAME_R_6_ARG - /* This one is what glibc provides. */ - char buf[2048]; - struct hostent hostent; - int r; - r = gethostbyname_r(nodename, &hostent, buf, sizeof(buf), &ent, - &err); -#elif defined(_EVENT_HAVE_GETHOSTBYNAME_R_5_ARG) - char buf[2048]; - struct hostent hostent; - ent = gethostbyname_r(nodename, &hostent, buf, sizeof(buf), - &err); -#elif defined(_EVENT_HAVE_GETHOSTBYNAME_R_3_ARG) - struct hostent_data data; - struct hostent hostent; - memset(&data, 0, sizeof(data)); - err = gethostbyname_r(nodename, &hostent, &data); - ent = err ? NULL : &hostent; -#else - /* fall back to gethostbyname. */ - /* XXXX This needs a lock everywhere but Windows. */ - ent = gethostbyname(nodename); -#ifdef WIN32 - err = WSAGetLastError(); -#else - err = h_errno; -#endif -#endif - - /* Now we have either ent or err set. */ - if (!ent) { - /* XXX is this right for windows ? */ - switch (err) { - case TRY_AGAIN: - return EVUTIL_EAI_AGAIN; - case NO_RECOVERY: - default: - return EVUTIL_EAI_FAIL; - case HOST_NOT_FOUND: - return EVUTIL_EAI_NONAME; - case NO_ADDRESS: -#if NO_DATA != NO_ADDRESS - case NO_DATA: -#endif - return EVUTIL_EAI_NODATA; - } - } - - if (ent->h_addrtype != hints.ai_family && - hints.ai_family != PF_UNSPEC) { - /* This wasn't the type we were hoping for. Too bad - * we never had a chance to ask gethostbyname for what - * we wanted. */ - return EVUTIL_EAI_NONAME; - } - - /* Make sure we got _some_ answers. */ - if (ent->h_length == 0) - return EVUTIL_EAI_NODATA; - - /* If we got an address type we don't know how to make a - sockaddr for, give up. */ - if (ent->h_addrtype != PF_INET && ent->h_addrtype != PF_INET6) - return EVUTIL_EAI_FAMILY; - - *res = addrinfo_from_hostent(ent, port, &hints); - if (! *res) - return EVUTIL_EAI_MEMORY; - } - - return 0; -#endif -} - -void -evutil_freeaddrinfo(struct evutil_addrinfo *ai) -{ -#ifdef _EVENT_HAVE_GETADDRINFO - if (!(ai->ai_flags & EVUTIL_AI_LIBEVENT_ALLOCATED)) { - freeaddrinfo(ai); - return; - } -#endif - while (ai) { - struct evutil_addrinfo *next = ai->ai_next; - if (ai->ai_canonname) - mm_free(ai->ai_canonname); - mm_free(ai); - ai = next; - } -} - -static evdns_getaddrinfo_fn evdns_getaddrinfo_impl = NULL; - -void -evutil_set_evdns_getaddrinfo_fn(evdns_getaddrinfo_fn fn) -{ - if (!evdns_getaddrinfo_impl) - evdns_getaddrinfo_impl = fn; -} - -/* Internal helper function: act like evdns_getaddrinfo if dns_base is set; - * otherwise do a blocking resolve and pass the result to the callback in the - * way that evdns_getaddrinfo would. - */ -int -evutil_getaddrinfo_async(struct evdns_base *dns_base, - const char *nodename, const char *servname, - const struct evutil_addrinfo *hints_in, - void (*cb)(int, struct evutil_addrinfo *, void *), void *arg) -{ - if (dns_base && evdns_getaddrinfo_impl) { - evdns_getaddrinfo_impl( - dns_base, nodename, servname, hints_in, cb, arg); - } else { - struct evutil_addrinfo *ai=NULL; - int err; - err = evutil_getaddrinfo(nodename, servname, hints_in, &ai); - cb(err, ai, arg); - } - return 0; -} - -const char * -evutil_gai_strerror(int err) -{ - /* As a sneaky side-benefit, this case statement will get most - * compilers to tell us if any of the error codes we defined - * conflict with the platform's native error codes. */ - switch (err) { - case EVUTIL_EAI_CANCEL: - return "Request canceled"; - case 0: - return "No error"; - - case EVUTIL_EAI_ADDRFAMILY: - return "address family for nodename not supported"; - case EVUTIL_EAI_AGAIN: - return "temporary failure in name resolution"; - case EVUTIL_EAI_BADFLAGS: - return "invalid value for ai_flags"; - case EVUTIL_EAI_FAIL: - return "non-recoverable failure in name resolution"; - case EVUTIL_EAI_FAMILY: - return "ai_family not supported"; - case EVUTIL_EAI_MEMORY: - return "memory allocation failure"; - case EVUTIL_EAI_NODATA: - return "no address associated with nodename"; - case EVUTIL_EAI_NONAME: - return "nodename nor servname provided, or not known"; - case EVUTIL_EAI_SERVICE: - return "servname not supported for ai_socktype"; - case EVUTIL_EAI_SOCKTYPE: - return "ai_socktype not supported"; - case EVUTIL_EAI_SYSTEM: - return "system error"; - default: -#if defined(USE_NATIVE_GETADDRINFO) && defined(WIN32) - return gai_strerrorA(err); -#elif defined(USE_NATIVE_GETADDRINFO) - return gai_strerror(err); -#else - return "Unknown error code"; -#endif - } -} - -#ifdef WIN32 -#define E(code, s) { code, (s " [" #code " ]") } -static struct { int code; const char *msg; } windows_socket_errors[] = { - E(WSAEINTR, "Interrupted function call"), - E(WSAEACCES, "Permission denied"), - E(WSAEFAULT, "Bad address"), - E(WSAEINVAL, "Invalid argument"), - E(WSAEMFILE, "Too many open files"), - E(WSAEWOULDBLOCK, "Resource temporarily unavailable"), - E(WSAEINPROGRESS, "Operation now in progress"), - E(WSAEALREADY, "Operation already in progress"), - E(WSAENOTSOCK, "Socket operation on nonsocket"), - E(WSAEDESTADDRREQ, "Destination address required"), - E(WSAEMSGSIZE, "Message too long"), - E(WSAEPROTOTYPE, "Protocol wrong for socket"), - E(WSAENOPROTOOPT, "Bad protocol option"), - E(WSAEPROTONOSUPPORT, "Protocol not supported"), - E(WSAESOCKTNOSUPPORT, "Socket type not supported"), - /* What's the difference between NOTSUPP and NOSUPPORT? :) */ - E(WSAEOPNOTSUPP, "Operation not supported"), - E(WSAEPFNOSUPPORT, "Protocol family not supported"), - E(WSAEAFNOSUPPORT, "Address family not supported by protocol family"), - E(WSAEADDRINUSE, "Address already in use"), - E(WSAEADDRNOTAVAIL, "Cannot assign requested address"), - E(WSAENETDOWN, "Network is down"), - E(WSAENETUNREACH, "Network is unreachable"), - E(WSAENETRESET, "Network dropped connection on reset"), - E(WSAECONNABORTED, "Software caused connection abort"), - E(WSAECONNRESET, "Connection reset by peer"), - E(WSAENOBUFS, "No buffer space available"), - E(WSAEISCONN, "Socket is already connected"), - E(WSAENOTCONN, "Socket is not connected"), - E(WSAESHUTDOWN, "Cannot send after socket shutdown"), - E(WSAETIMEDOUT, "Connection timed out"), - E(WSAECONNREFUSED, "Connection refused"), - E(WSAEHOSTDOWN, "Host is down"), - E(WSAEHOSTUNREACH, "No route to host"), - E(WSAEPROCLIM, "Too many processes"), - - /* Yes, some of these start with WSA, not WSAE. No, I don't know why. */ - E(WSASYSNOTREADY, "Network subsystem is unavailable"), - E(WSAVERNOTSUPPORTED, "Winsock.dll out of range"), - E(WSANOTINITIALISED, "Successful WSAStartup not yet performed"), - E(WSAEDISCON, "Graceful shutdown now in progress"), -#ifdef WSATYPE_NOT_FOUND - E(WSATYPE_NOT_FOUND, "Class type not found"), -#endif - E(WSAHOST_NOT_FOUND, "Host not found"), - E(WSATRY_AGAIN, "Nonauthoritative host not found"), - E(WSANO_RECOVERY, "This is a nonrecoverable error"), - E(WSANO_DATA, "Valid name, no data record of requested type)"), - - /* There are some more error codes whose numeric values are marked - * <b>OS dependent</b>. They start with WSA_, apparently for the same - * reason that practitioners of some craft traditions deliberately - * introduce imperfections into their baskets and rugs "to allow the - * evil spirits to escape." If we catch them, then our binaries - * might not report consistent results across versions of Windows. - * Thus, I'm going to let them all fall through. - */ - { -1, NULL }, -}; -#undef E -/** Equivalent to strerror, but for windows socket errors. */ -const char * -evutil_socket_error_to_string(int errcode) -{ - /* XXXX Is there really no built-in function to do this? */ - int i; - for (i=0; windows_socket_errors[i].code >= 0; ++i) { - if (errcode == windows_socket_errors[i].code) - return windows_socket_errors[i].msg; - } - return strerror(errcode); -} -#endif - -int -evutil_snprintf(char *buf, size_t buflen, const char *format, ...) -{ - int r; - va_list ap; - va_start(ap, format); - r = evutil_vsnprintf(buf, buflen, format, ap); - va_end(ap); - return r; -} - -int -evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap) -{ - int r; - if (!buflen) - return 0; -#if defined(_MSC_VER) || defined(WIN32) - r = _vsnprintf(buf, buflen, format, ap); - if (r < 0) - r = _vscprintf(format, ap); -#elif defined(sgi) - /* Make sure we always use the correct vsnprintf on IRIX */ - extern int _xpg5_vsnprintf(char * __restrict, - __SGI_LIBC_NAMESPACE_QUALIFIER size_t, - const char * __restrict, /* va_list */ char *); - - r = _xpg5_vsnprintf(buf, buflen, format, ap); -#else - r = vsnprintf(buf, buflen, format, ap); -#endif - buf[buflen-1] = '\0'; - return r; -} - -#define USE_INTERNAL_NTOP -#define USE_INTERNAL_PTON - -const char * -evutil_inet_ntop(int af, const void *src, char *dst, size_t len) -{ -#if defined(_EVENT_HAVE_INET_NTOP) && !defined(USE_INTERNAL_NTOP) - return inet_ntop(af, src, dst, len); -#else - if (af == AF_INET) { - const struct in_addr *in = src; - const ev_uint32_t a = ntohl(in->s_addr); - int r; - r = evutil_snprintf(dst, len, "%d.%d.%d.%d", - (int)(ev_uint8_t)((a>>24)&0xff), - (int)(ev_uint8_t)((a>>16)&0xff), - (int)(ev_uint8_t)((a>>8 )&0xff), - (int)(ev_uint8_t)((a )&0xff)); - if (r<0||(size_t)r>=len) - return NULL; - else - return dst; -#ifdef AF_INET6 - } else if (af == AF_INET6) { - const struct in6_addr *addr = src; - char buf[64], *cp; - int longestGapLen = 0, longestGapPos = -1, i, - curGapPos = -1, curGapLen = 0; - ev_uint16_t words[8]; - for (i = 0; i < 8; ++i) { - words[i] = - (((ev_uint16_t)addr->s6_addr[2*i])<<8) + addr->s6_addr[2*i+1]; - } - if (words[0] == 0 && words[1] == 0 && words[2] == 0 && words[3] == 0 && - words[4] == 0 && ((words[5] == 0 && words[6] && words[7]) || - (words[5] == 0xffff))) { - /* This is an IPv4 address. */ - if (words[5] == 0) { - evutil_snprintf(buf, sizeof(buf), "::%d.%d.%d.%d", - addr->s6_addr[12], addr->s6_addr[13], - addr->s6_addr[14], addr->s6_addr[15]); - } else { - evutil_snprintf(buf, sizeof(buf), "::%x:%d.%d.%d.%d", words[5], - addr->s6_addr[12], addr->s6_addr[13], - addr->s6_addr[14], addr->s6_addr[15]); - } - if (strlen(buf) > len) - return NULL; - strlcpy(dst, buf, len); - return dst; - } - i = 0; - while (i < 8) { - if (words[i] == 0) { - curGapPos = i++; - curGapLen = 1; - while (i<8 && words[i] == 0) { - ++i; ++curGapLen; - } - if (curGapLen > longestGapLen) { - longestGapPos = curGapPos; - longestGapLen = curGapLen; - } - } else { - ++i; - } - } - if (longestGapLen<=1) - longestGapPos = -1; - - cp = buf; - for (i = 0; i < 8; ++i) { - if (words[i] == 0 && longestGapPos == i) { - if (i == 0) - *cp++ = ':'; - *cp++ = ':'; - while (i < 8 && words[i] == 0) - ++i; - --i; /* to compensate for loop increment. */ - } else { - evutil_snprintf(cp, - sizeof(buf)-(cp-buf), "%x", (unsigned)words[i]); - cp += strlen(cp); - if (i != 7) - *cp++ = ':'; - } - } - *cp = '\0'; - if (strlen(buf) > len) - return NULL; - strlcpy(dst, buf, len); - return dst; -#endif - } else { - return NULL; - } -#endif -} - -int -evutil_inet_pton(int af, const char *src, void *dst) -{ -#if defined(_EVENT_HAVE_INET_PTON) && !defined(USE_INTERNAL_PTON) - return inet_pton(af, src, dst); -#else - if (af == AF_INET) { - int a,b,c,d; - char more; - struct in_addr *addr = dst; - if (sscanf(src, "%d.%d.%d.%d%c", &a,&b,&c,&d,&more) != 4) - return 0; - if (a < 0 || a > 255) return 0; - if (b < 0 || b > 255) return 0; - if (c < 0 || c > 255) return 0; - if (d < 0 || d > 255) return 0; - addr->s_addr = htonl((a<<24) | (b<<16) | (c<<8) | d); - return 1; -#ifdef AF_INET6 - } else if (af == AF_INET6) { - struct in6_addr *out = dst; - ev_uint16_t words[8]; - int gapPos = -1, i, setWords=0; - const char *dot = strchr(src, '.'); - const char *eow; /* end of words. */ - if (dot == src) - return 0; - else if (!dot) - eow = src+strlen(src); - else { - int byte1,byte2,byte3,byte4; - char more; - for (eow = dot-1; eow >= src && EVUTIL_ISDIGIT(*eow); --eow) - ; - ++eow; - - /* We use "scanf" because some platform inet_aton()s are too lax - * about IPv4 addresses of the form "1.2.3" */ - if (sscanf(eow, "%d.%d.%d.%d%c", - &byte1,&byte2,&byte3,&byte4,&more) != 4) - return 0; - - if (byte1 > 255 || byte1 < 0 || - byte2 > 255 || byte2 < 0 || - byte3 > 255 || byte3 < 0 || - byte4 > 255 || byte4 < 0) - return 0; - - words[6] = (byte1<<8) | byte2; - words[7] = (byte3<<8) | byte4; - setWords += 2; - } - - i = 0; - while (src < eow) { - if (i > 7) - return 0; - if (EVUTIL_ISXDIGIT(*src)) { - char *next; - long r = strtol(src, &next, 16); - if (next > 4+src) - return 0; - if (next == src) - return 0; - if (r<0 || r>65536) - return 0; - - words[i++] = (ev_uint16_t)r; - setWords++; - src = next; - if (*src != ':' && src != eow) - return 0; - ++src; - } else if (*src == ':' && i > 0 && gapPos==-1) { - gapPos = i; - ++src; - } else if (*src == ':' && i == 0 && src[1] == ':' && gapPos==-1) { - gapPos = i; - src += 2; - } else { - return 0; - } - } - - if (setWords > 8 || - (setWords == 8 && gapPos != -1) || - (setWords < 8 && gapPos == -1)) - return 0; - - if (gapPos >= 0) { - int nToMove = setWords - (dot ? 2 : 0) - gapPos; - int gapLen = 8 - setWords; - /* assert(nToMove >= 0); */ - if (nToMove < 0) - return -1; /* should be impossible */ - memmove(&words[gapPos+gapLen], &words[gapPos], - sizeof(ev_uint16_t)*nToMove); - memset(&words[gapPos], 0, sizeof(ev_uint16_t)*gapLen); - } - for (i = 0; i < 8; ++i) { - out->s6_addr[2*i ] = words[i] >> 8; - out->s6_addr[2*i+1] = words[i] & 0xff; - } - - return 1; -#endif - } else { - return -1; - } -#endif -} - -int -evutil_parse_sockaddr_port(const char *ip_as_string, struct sockaddr *out, int *outlen) -{ - int port; - char buf[128]; - const char *cp, *addr_part, *port_part; - int is_ipv6; - /* recognized formats are: - * [ipv6]:port - * ipv6 - * [ipv6] - * ipv4:port - * ipv4 - */ - - cp = strchr(ip_as_string, ':'); - if (*ip_as_string == '[') { - int len; - if (!(cp = strchr(ip_as_string, ']'))) { - return -1; - } - len = (int) ( cp-(ip_as_string + 1) ); - if (len > (int)sizeof(buf)-1) { - return -1; - } - memcpy(buf, ip_as_string+1, len); - buf[len] = '\0'; - addr_part = buf; - if (cp[1] == ':') - port_part = cp+2; - else - port_part = NULL; - is_ipv6 = 1; - } else if (cp && strchr(cp+1, ':')) { - is_ipv6 = 1; - addr_part = ip_as_string; - port_part = NULL; - } else if (cp) { - is_ipv6 = 0; - if (cp - ip_as_string > (int)sizeof(buf)-1) { - return -1; - } - memcpy(buf, ip_as_string, cp-ip_as_string); - buf[cp-ip_as_string] = '\0'; - addr_part = buf; - port_part = cp+1; - } else { - addr_part = ip_as_string; - port_part = NULL; - is_ipv6 = 0; - } - - if (port_part == NULL) { - port = 0; - } else { - port = atoi(port_part); - if (port <= 0 || port > 65535) { - return -1; - } - } - - if (!addr_part) - return -1; /* Should be impossible. */ -#ifdef AF_INET6 - if (is_ipv6) - { - struct sockaddr_in6 sin6; - memset(&sin6, 0, sizeof(sin6)); -#ifdef _EVENT_HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN - sin6.sin6_len = sizeof(sin6); -#endif - sin6.sin6_family = AF_INET6; - sin6.sin6_port = htons(port); - if (1 != evutil_inet_pton(AF_INET6, addr_part, &sin6.sin6_addr)) - return -1; - if ((int)sizeof(sin6) > *outlen) - return -1; - memset(out, 0, *outlen); - memcpy(out, &sin6, sizeof(sin6)); - *outlen = sizeof(sin6); - return 0; - } - else -#endif - { - struct sockaddr_in sin; - memset(&sin, 0, sizeof(sin)); -#ifdef _EVENT_HAVE_STRUCT_SOCKADDR_IN_SIN_LEN - sin.sin_len = sizeof(sin); -#endif - sin.sin_family = AF_INET; - sin.sin_port = htons(port); - if (1 != evutil_inet_pton(AF_INET, addr_part, &sin.sin_addr)) - return -1; - if ((int)sizeof(sin) > *outlen) - return -1; - memset(out, 0, *outlen); - memcpy(out, &sin, sizeof(sin)); - *outlen = sizeof(sin); - return 0; - } -} - -const char * -evutil_format_sockaddr_port(const struct sockaddr *sa, char *out, size_t outlen) -{ - char b[128]; - const char *res=NULL; - int port; - if (sa->sa_family == AF_INET) { - const struct sockaddr_in *sin = (const struct sockaddr_in*)sa; - res = evutil_inet_ntop(AF_INET, &sin->sin_addr,b,sizeof(b)); - port = ntohs(sin->sin_port); - if (res) { - evutil_snprintf(out, outlen, "%s:%d", b, port); - return out; - } - } else if (sa->sa_family == AF_INET6) { - const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6*)sa; - res = evutil_inet_ntop(AF_INET6, &sin6->sin6_addr,b,sizeof(b)); - port = ntohs(sin6->sin6_port); - if (res) { - evutil_snprintf(out, outlen, "[%s]:%d", b, port); - return out; - } - } - - evutil_snprintf(out, outlen, "<addr with socktype %d>", - (int)sa->sa_family); - return out; -} - -int -evutil_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2, - int include_port) -{ - int r; - if (0 != (r = (sa1->sa_family - sa2->sa_family))) - return r; - - if (sa1->sa_family == AF_INET) { - const struct sockaddr_in *sin1, *sin2; - sin1 = (const struct sockaddr_in *)sa1; - sin2 = (const struct sockaddr_in *)sa2; - if (sin1->sin_addr.s_addr < sin2->sin_addr.s_addr) - return -1; - else if (sin1->sin_addr.s_addr > sin2->sin_addr.s_addr) - return 1; - else if (include_port && - (r = ((int)sin1->sin_port - (int)sin2->sin_port))) - return r; - else - return 0; - } -#ifdef AF_INET6 - else if (sa1->sa_family == AF_INET6) { - const struct sockaddr_in6 *sin1, *sin2; - sin1 = (const struct sockaddr_in6 *)sa1; - sin2 = (const struct sockaddr_in6 *)sa2; - if ((r = memcmp(sin1->sin6_addr.s6_addr, sin2->sin6_addr.s6_addr, 16))) - return r; - else if (include_port && - (r = ((int)sin1->sin6_port - (int)sin2->sin6_port))) - return r; - else - return 0; - } -#endif - return 1; -} - -/* Tables to implement ctypes-replacement EVUTIL_IS*() functions. Each table - * has 256 bits to look up whether a character is in some set or not. This - * fails on non-ASCII platforms, but so does every other place where we - * take a char and write it onto the network. - **/ -static const ev_uint32_t EVUTIL_ISALPHA_TABLE[8] = - { 0, 0, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 }; -static const ev_uint32_t EVUTIL_ISALNUM_TABLE[8] = - { 0, 0x3ff0000, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 }; -static const ev_uint32_t EVUTIL_ISSPACE_TABLE[8] = { 0x3e00, 0x1, 0, 0, 0, 0, 0, 0 }; -static const ev_uint32_t EVUTIL_ISXDIGIT_TABLE[8] = - { 0, 0x3ff0000, 0x7e, 0x7e, 0, 0, 0, 0 }; -static const ev_uint32_t EVUTIL_ISDIGIT_TABLE[8] = { 0, 0x3ff0000, 0, 0, 0, 0, 0, 0 }; -static const ev_uint32_t EVUTIL_ISPRINT_TABLE[8] = - { 0, 0xffffffff, 0xffffffff, 0x7fffffff, 0, 0, 0, 0x0 }; -static const ev_uint32_t EVUTIL_ISUPPER_TABLE[8] = { 0, 0, 0x7fffffe, 0, 0, 0, 0, 0 }; -static const ev_uint32_t EVUTIL_ISLOWER_TABLE[8] = { 0, 0, 0, 0x7fffffe, 0, 0, 0, 0 }; -/* Upper-casing and lowercasing tables to map characters to upper/lowercase - * equivalents. */ -static const unsigned char EVUTIL_TOUPPER_TABLE[256] = { - 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, - 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31, - 32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47, - 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63, - 64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79, - 80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95, - 96,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79, - 80,81,82,83,84,85,86,87,88,89,90,123,124,125,126,127, - 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, - 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159, - 160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175, - 176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191, - 192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207, - 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223, - 224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239, - 240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255, -}; -static const unsigned char EVUTIL_TOLOWER_TABLE[256] = { - 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, - 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31, - 32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47, - 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63, - 64,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111, - 112,113,114,115,116,117,118,119,120,121,122,91,92,93,94,95, - 96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111, - 112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127, - 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, - 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159, - 160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175, - 176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191, - 192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207, - 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223, - 224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239, - 240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255, -}; - -#define IMPL_CTYPE_FN(name) \ - int EVUTIL_##name(char c) { \ - ev_uint8_t u = c; \ - return !!(EVUTIL_##name##_TABLE[(u >> 5) & 7] & (1 << (u & 31))); \ - } -IMPL_CTYPE_FN(ISALPHA) -IMPL_CTYPE_FN(ISALNUM) -IMPL_CTYPE_FN(ISSPACE) -IMPL_CTYPE_FN(ISDIGIT) -IMPL_CTYPE_FN(ISXDIGIT) -IMPL_CTYPE_FN(ISPRINT) -IMPL_CTYPE_FN(ISLOWER) -IMPL_CTYPE_FN(ISUPPER) - -char EVUTIL_TOLOWER(char c) -{ - return ((char)EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c]); -} -char EVUTIL_TOUPPER(char c) -{ - return ((char)EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c]); -} -int -evutil_ascii_strcasecmp(const char *s1, const char *s2) -{ - char c1, c2; - while (1) { - c1 = EVUTIL_TOLOWER(*s1++); - c2 = EVUTIL_TOLOWER(*s2++); - if (c1 < c2) - return -1; - else if (c1 > c2) - return 1; - else if (c1 == 0) - return 0; - } -} -int evutil_ascii_strncasecmp(const char *s1, const char *s2, size_t n) -{ - char c1, c2; - while (n--) { - c1 = EVUTIL_TOLOWER(*s1++); - c2 = EVUTIL_TOLOWER(*s2++); - if (c1 < c2) - return -1; - else if (c1 > c2) - return 1; - else if (c1 == 0) - return 0; - } - return 0; -} - -static int -evutil_issetugid(void) -{ -//#ifdef _EVENT_HAVE_ISSETUGID -// return issetugid(); -//#else - -//#ifdef _EVENT_HAVE_GETEUID -// if (getuid() != geteuid()) -// return 1; -//#endif -//#ifdef _EVENT_HAVE_GETEGID -// if (getgid() != getegid()) -// return 1; -//#endif - return 0; -//#endif -} - -const char * -evutil_getenv(const char *varname) -{ - if (evutil_issetugid()) - return NULL; - - return getenv(varname); -} - -long -_evutil_weakrand(void) -{ -#ifdef WIN32 - return rand(); -#else - return random(); -#endif -} - -/** - * Volatile pointer to memset: we use this to keep the compiler from - * eliminating our call to memset. - */ -void * (*volatile evutil_memset_volatile_)(void *, int, size_t) = memset; - -void -evutil_memclear_(void *mem, size_t len) -{ - evutil_memset_volatile_(mem, 0, len); -} - -int -evutil_sockaddr_is_loopback(const struct sockaddr *addr) -{ - static const char LOOPBACK_S6[16] = - "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1"; - if (addr->sa_family == AF_INET) { - struct sockaddr_in *sin = (struct sockaddr_in *)addr; - return (ntohl(sin->sin_addr.s_addr) & 0xff000000) == 0x7f000000; - } else if (addr->sa_family == AF_INET6) { - struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr; - return !memcmp(sin6->sin6_addr.s6_addr, LOOPBACK_S6, 16); - } - return 0; -} - -#define MAX_SECONDS_IN_MSEC_LONG \ - (((LONG_MAX) - 999) / 1000) - -long -evutil_tv_to_msec(const struct timeval *tv) -{ - if (tv->tv_usec > 1000000 || tv->tv_sec > MAX_SECONDS_IN_MSEC_LONG) - return -1; - - return (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000); -} - -int -evutil_hex_char_to_int(char c) -{ - switch(c) - { - case '0': return 0; - case '1': return 1; - case '2': return 2; - case '3': return 3; - case '4': return 4; - case '5': return 5; - case '6': return 6; - case '7': return 7; - case '8': return 8; - case '9': return 9; - case 'A': case 'a': return 10; - case 'B': case 'b': return 11; - case 'C': case 'c': return 12; - case 'D': case 'd': return 13; - case 'E': case 'e': return 14; - case 'F': case 'f': return 15; - } - return -1; -} - -#ifdef WIN32 -HANDLE -evutil_load_windows_system_library(const TCHAR *library_name) -{ - TCHAR path[MAX_PATH]; - unsigned n; - n = GetSystemDirectory(path, MAX_PATH); - if (n == 0 || n + _tcslen(library_name) + 2 >= MAX_PATH) - return 0; - _tcscat(path, TEXT("\\")); - _tcscat(path, library_name); - return LoadLibrary(path); -} -#endif - |