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Diffstat (limited to 'external/libevent_files/evutil.c')
| -rw-r--r-- | external/libevent_files/evutil.c | 2190 |
1 files changed, 2190 insertions, 0 deletions
diff --git a/external/libevent_files/evutil.c b/external/libevent_files/evutil.c new file mode 100644 index 00000000..05e662aa --- /dev/null +++ b/external/libevent_files/evutil.c @@ -0,0 +1,2190 @@ +/* + * 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 + |