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- /* Copyright 2003-2004 Roger Dingledine
- * Copyright 2004-2006 Roger Dingledine, Nick Mathewson */
- /* See LICENSE for licensing information */
- /* $Id$ */
- const char compat_c_id[] =
- "$Id$";
- /**
- * \file compat.c
- * \brief Wrappers to make calls more portable. This code defines
- * functions such as tor_malloc, tor_snprintf, get/set various data types,
- * renaming, setting socket options, switching user IDs. It is basically
- * where the non-portable items are conditionally included depending on
- * the platform.
- **/
- /* This is required on rh7 to make strptime not complain.
- * We also need it to make memmem get defined (where available)
- */
- #define _GNU_SOURCE
- #include "orconfig.h"
- #include "compat.h"
- #ifdef MS_WINDOWS
- #include <process.h>
- #include <windows.h>
- #endif
- #ifdef HAVE_UNAME
- #include <sys/utsname.h>
- #endif
- #ifdef HAVE_SYS_TIME_H
- #include <sys/time.h>
- #endif
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #ifdef HAVE_SYS_FCNTL_H
- #include <sys/fcntl.h>
- #endif
- #ifdef HAVE_PWD_H
- #include <pwd.h>
- #endif
- #ifdef HAVE_GRP_H
- #include <grp.h>
- #endif
- #ifdef HAVE_FCNTL_H
- #include <fcntl.h>
- #endif
- #ifdef HAVE_SYS_RESOURCE_H
- #include <sys/resource.h>
- #endif
- #ifdef HAVE_ERRNO_H
- #include <errno.h>
- #endif
- #ifdef HAVE_NETINET_IN_H
- #include <netinet/in.h>
- #endif
- #ifdef HAVE_ARPA_INET_H
- #include <arpa/inet.h>
- #endif
- #ifndef HAVE_GETTIMEOFDAY
- #ifdef HAVE_FTIME
- #include <sys/timeb.h>
- #endif
- #endif
- #ifdef HAVE_SYS_SOCKET_H
- #include <sys/socket.h>
- #endif
- #ifdef HAVE_NETDB_H
- #include <netdb.h>
- #endif
- #ifdef HAVE_SYS_PARAM_H
- #include <sys/param.h> /* FreeBSD needs this to know what version it is */
- #endif
- #include <stdarg.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <assert.h>
- #ifdef HAVE_PTHREAD_H
- #include <pthread.h>
- #endif
- #ifdef HAVE_UTIME_H
- #include <utime.h>
- #endif
- #ifdef HAVE_SYS_UTIME_H
- #include <sys/utime.h>
- #endif
- #ifdef HAVE_SYS_MMAN_H
- #include <sys/mman.h>
- #endif
- #ifdef USE_BSOCKETS
- #include <bsocket.h>
- #endif
- #include "log.h"
- #include "util.h"
- /* Inline the strl functions if the platform doesn't have them. */
- #ifndef HAVE_STRLCPY
- #include "strlcpy.c"
- #endif
- #ifndef HAVE_STRLCAT
- #include "strlcat.c"
- #endif
- #ifndef INADDR_NONE
- /* This is used by inet_addr, but apparently Solaris doesn't define it
- * anyplace. */
- #define INADDR_NONE ((unsigned long) -1)
- #endif
- #ifdef HAVE_SYS_MMAN_H
- /** DOCDOC */
- typedef struct tor_mmap_impl_t {
- tor_mmap_t base;
- size_t mapping_size; /**< Size of the actual mapping. (This is this file
- * size, rounded up to the nearest page.) */
- } tor_mmap_impl_t;
- /** DOCDOC */
- tor_mmap_t *
- tor_mmap_file(const char *filename)
- {
- int fd; /* router file */
- char *string;
- int page_size;
- tor_mmap_impl_t *res;
- size_t size, filesize;
- tor_assert(filename);
- fd = open(filename, O_RDONLY, 0);
- if (fd<0) {
- int severity = (errno == ENOENT) ? LOG_INFO : LOG_WARN;
- log_fn(severity, LD_FS,"Could not open \"%s\" for mmap(): %s",filename,
- strerror(errno));
- return NULL;
- }
- size = filesize = (size_t) lseek(fd, 0, SEEK_END);
- lseek(fd, 0, SEEK_SET);
- /* ensure page alignment */
- page_size = getpagesize();
- size += (size%page_size) ? page_size-(size%page_size) : 0;
- if (!size) {
- /* Zero-length file. If we call mmap on it, it will succeed but
- * return NULL, and bad things will happen. So just fail. */
- log_info(LD_FS,"File \"%s\" is empty. Ignoring.",filename);
- return NULL;
- }
- string = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (string == MAP_FAILED) {
- close(fd);
- log_warn(LD_FS,"Could not mmap file \"%s\": %s", filename,
- strerror(errno));
- return NULL;
- }
- close(fd);
- res = tor_malloc_zero(sizeof(tor_mmap_impl_t));
- res->base.data = string;
- res->base.size = filesize;
- res->mapping_size = size;
- return &(res->base);
- }
- /** DOCDOC */
- void
- tor_munmap_file(tor_mmap_t *handle)
- {
- tor_mmap_impl_t *h = (tor_mmap_impl_t*)
- (((char*)handle) - STRUCT_OFFSET(tor_mmap_impl_t, base));
- munmap((char*)h->base.data, h->mapping_size);
- tor_free(h);
- }
- #elif defined(MS_WINDOWS)
- /** DOCDOC */
- typedef struct win_mmap_t {
- tor_mmap_t base;
- HANDLE file_handle;
- HANDLE mmap_handle;
- } win_mmap_t;
- tor_mmap_t *
- tor_mmap_file(const char *filename)
- {
- win_mmap_t *res = tor_malloc_zero(sizeof(win_mmap_t));
- res->file_handle = INVALID_HANDLE_VALUE;
- res->mmap_handle = NULL;
- res->file_handle = CreateFile(filename,
- GENERIC_READ,
- 0, NULL,
- OPEN_EXISTING,
- FILE_ATTRIBUTE_NORMAL,
- 0);
- if (res->file_handle == INVALID_HANDLE_VALUE)
- goto win_err;
- res->base.size = GetFileSize(res->file_handle, NULL);
- if (res->base.size == 0) {
- log_info(LD_FS,"File \"%s\" is empty. Ignoring.",filename);
- goto err;
- }
- res->mmap_handle = CreateFileMapping(res->file_handle,
- NULL,
- PAGE_READONLY,
- #if SIZEOF_SIZE_T > 4
- (res->base.size >> 32),
- #else
- 0,
- #endif
- (res->base.size & 0xfffffffful),
- NULL);
- if (res->mmap_handle == NULL)
- goto win_err;
- res->base.data = (char*) MapViewOfFile(res->mmap_handle,
- FILE_MAP_READ,
- 0, 0, 0);
- if (!res->base.data)
- goto win_err;
- return &(res->base);
- win_err: {
- DWORD e = GetLastError();
- int severity = (e == ERROR_FILE_NOT_FOUND || e == PATH_NOT_FOUND) ?
- LOG_INFO : LOG_WARN;
- char *msg = format_win32_error(e);
- log_fn(LOG_INFO, "Couldn't mmap file \"%s\": %s", filename, msg);
- tor_free(msg);
- }
- err:
- tor_munmap_file(&res->base);
- return NULL;
- }
- void
- tor_munmap_file(tor_mmap_t *handle)
- {
- win_mmap_t *h = (win_mmap_t*)
- (((char*)handle) - STRUCT_OFFSET(win_mmap_t, base));
- if (handle->data)
- /* This is an ugly cast, but without it, "data" in struct tor_mmap_t would
- have to be redefined as non-const. */
- UnmapViewOfFile( (LPVOID) handle->data);
- if (h->mmap_handle != NULL)
- CloseHandle(h->mmap_handle);
- if (h->file_handle != INVALID_HANDLE_VALUE)
- CloseHandle(h->file_handle);
- tor_free(h);
- }
- #else
- tor_mmap_t *
- tor_mmap_file(const char *filename)
- {
- struct stat st;
- char *res = read_file_to_str(filename, RFTS_BIN|RFTS_IGNORE_MISSING, &st);
- tor_mmap_t *handle;
- if (! res)
- return NULL;
- handle = tor_malloc_zero(sizeof(tor_mmap_t));
- handle->data = res;
- handle->size = st.st_size;
- return handle;
- }
- void
- tor_munmap_file(tor_mmap_t *handle)
- {
- char *d = (char*)handle->data;
- tor_free(d);
- memset(handle, sizeof(tor_mmap_t), 0);
- tor_free(handle);
- }
- #endif
- /** Replacement for snprintf. Differs from platform snprintf in two
- * ways: First, always NUL-terminates its output. Second, always
- * returns -1 if the result is truncated. (Note that this return
- * behavior does <i>not</i> conform to C99; it just happens to be
- * easier to emulate "return -1" with conformant implementations than
- * it is to emulate "return number that would be written" with
- * non-conformant implementations.) */
- int
- tor_snprintf(char *str, size_t size, const char *format, ...)
- {
- va_list ap;
- int r;
- va_start(ap,format);
- r = tor_vsnprintf(str,size,format,ap);
- va_end(ap);
- return r;
- }
- /** Replacement for vsnprintf; behavior differs as tor_snprintf differs from
- * snprintf.
- */
- int
- tor_vsnprintf(char *str, size_t size, const char *format, va_list args)
- {
- int r;
- if (size == 0)
- return -1; /* no place for the NUL */
- if (size > SIZE_T_CEILING)
- return -1;
- #ifdef MS_WINDOWS
- r = _vsnprintf(str, size, format, args);
- #else
- r = vsnprintf(str, size, format, args);
- #endif
- str[size-1] = '\0';
- if (r < 0 || ((size_t)r) >= size)
- return -1;
- return r;
- }
- /** Given <b>hlen</b> bytes at <b>haystack</b> and <b>nlen</b> bytes at
- * <b>needle</b>, return a pointer to the first occurrence of the needle
- * within the haystack, or NULL if there is no such occurrence.
- *
- * Requires that nlen be greater than zero.
- */
- const void *
- tor_memmem(const void *_haystack, size_t hlen,
- const void *_needle, size_t nlen)
- {
- #if defined(HAVE_MEMMEM) && (!defined(__GNUC__) || __GNUC__ >= 2)
- tor_assert(nlen);
- return memmem(_haystack, hlen, _needle, nlen);
- #else
- /* This isn't as fast as the GLIBC implementation, but it doesn't need to
- * be. */
- const char *p, *end;
- const char *haystack = (const char*)_haystack;
- const char *needle = (const char*)_needle;
- char first;
- tor_assert(nlen);
- p = haystack;
- end = haystack + hlen;
- first = *(const char*)needle;
- while ((p = memchr(p, first, end-p))) {
- if (p+nlen > end)
- return NULL;
- if (!memcmp(p, needle, nlen))
- return p;
- ++p;
- }
- return NULL;
- #endif
- }
- #ifdef MS_WINDOWS
- /** Take a filename and return a pointer to its final element. This
- * function is called on __FILE__ to fix a MSVC nit where __FILE__
- * contains the full path to the file. This is bad, because it
- * confuses users to find the home directory of the person who
- * compiled the binary in their warrning messages.
- */
- const char *
- tor_fix_source_file(const char *fname)
- {
- const char *cp1, *cp2, *r;
- cp1 = strrchr(fname, '/');
- cp2 = strrchr(fname, '\\');
- if (cp1 && cp2) {
- r = (cp1<cp2)?(cp2+1):(cp1+1);
- } else if (cp1) {
- r = cp1+1;
- } else if (cp2) {
- r = cp2+1;
- } else {
- r = fname;
- }
- return r;
- }
- #endif
- /**
- * Read a 16-bit value beginning at <b>cp</b>. Equivalent to
- * *(uint16_t*)(cp), but will not cause segfaults on platforms that forbid
- * unaligned memory access.
- */
- uint16_t
- get_uint16(const char *cp)
- {
- uint16_t v;
- memcpy(&v,cp,2);
- return v;
- }
- /**
- * Read a 32-bit value beginning at <b>cp</b>. Equivalent to
- * *(uint32_t*)(cp), but will not cause segfaults on platforms that forbid
- * unaligned memory access.
- */
- uint32_t
- get_uint32(const char *cp)
- {
- uint32_t v;
- memcpy(&v,cp,4);
- return v;
- }
- /**
- * Set a 16-bit value beginning at <b>cp</b> to <b>v</b>. Equivalent to
- * *(uint16_t)(cp) = v, but will not cause segfaults on platforms that forbid
- * unaligned memory access. */
- void
- set_uint16(char *cp, uint16_t v)
- {
- memcpy(cp,&v,2);
- }
- /**
- * Set a 32-bit value beginning at <b>cp</b> to <b>v</b>. Equivalent to
- * *(uint32_t)(cp) = v, but will not cause segfaults on platforms that forbid
- * unaligned memory access. */
- void
- set_uint32(char *cp, uint32_t v)
- {
- memcpy(cp,&v,4);
- }
- /**
- * Rename the file <b>from</b> to the file <b>to</b>. On unix, this is
- * the same as rename(2). On windows, this removes <b>to</b> first if
- * it already exists.
- * Returns 0 on success. Returns -1 and sets errno on failure.
- */
- int
- replace_file(const char *from, const char *to)
- {
- #ifndef MS_WINDOWS
- return rename(from,to);
- #else
- switch (file_status(to))
- {
- case FN_NOENT:
- break;
- case FN_FILE:
- if (unlink(to)) return -1;
- break;
- case FN_ERROR:
- return -1;
- case FN_DIR:
- errno = EISDIR;
- return -1;
- }
- return rename(from,to);
- #endif
- }
- /** Change <b>fname</b>'s modification time to now. */
- int
- touch_file(const char *fname)
- {
- if (utime(fname, NULL)!=0)
- return -1;
- return 0;
- }
- /** Turn <b>socket</b> into a nonblocking socket.
- */
- void
- set_socket_nonblocking(int socket)
- {
- #if defined(MS_WINDOWS) && !defined(USE_BSOCKETS)
- unsigned long nonblocking = 1;
- ioctlsocket(socket, FIONBIO, (unsigned long*) &nonblocking);
- #else
- fcntl(socket, F_SETFL, O_NONBLOCK);
- #endif
- }
- /**
- * Allocate a pair of connected sockets. (Like socketpair(family,
- * type,protocol,fd), but works on systems that don't have
- * socketpair.)
- *
- * Currently, only (AF_UNIX, SOCK_STREAM, 0 ) sockets are supported.
- *
- * Note that on systems without socketpair, this call will fail if
- * localhost is inaccessible (for example, if the networking
- * stack is down). And even if it succeeds, the socket pair will not
- * be able to read while localhost is down later (the socket pair may
- * even close, depending on OS-specific timeouts).
- *
- * Returns 0 on success and -errno on failure; do not rely on the value
- * of errno or WSAGetLastError().
- **/
- /* It would be nicer just to set errno, but that won't work for windows. */
- int
- tor_socketpair(int family, int type, int protocol, int fd[2])
- {
- //don't use win32 socketpairs (they are always bad)
- #if defined(HAVE_SOCKETPAIR) && !defined(MS_WINDOWS)
- int r;
- r = socketpair(family, type, protocol, fd);
- return r < 0 ? -errno : r;
- #elif defined(USE_BSOCKETS)
- return bsockepair(family, type, protocol, fd);
- #else
- /* 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.
- */
- int listener = -1;
- int connector = -1;
- int acceptor = -1;
- struct sockaddr_in listen_addr;
- struct sockaddr_in connect_addr;
- int size;
- int saved_errno = -1;
- if (protocol
- #ifdef AF_UNIX
- || family != AF_UNIX
- #endif
- ) {
- #ifdef MS_WINDOWS
- return -WSAEAFNOSUPPORT;
- #else
- return -EAFNOSUPPORT;
- #endif
- }
- if (!fd) {
- return -EINVAL;
- }
- listener = socket(AF_INET, type, 0);
- if (listener < 0)
- return -tor_socket_errno(-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;
- tor_close_socket(listener);
- /* 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;
- }
- fd[0] = connector;
- fd[1] = acceptor;
- return 0;
- abort_tidy_up_and_fail:
- #ifdef MS_WINDOWS
- saved_errno = WSAECONNABORTED;
- #else
- saved_errno = ECONNABORTED; /* I hope this is portable and appropriate. */
- #endif
- tidy_up_and_fail:
- if (saved_errno < 0)
- saved_errno = errno;
- if (listener != -1)
- tor_close_socket(listener);
- if (connector != -1)
- tor_close_socket(connector);
- if (acceptor != -1)
- tor_close_socket(acceptor);
- return -saved_errno;
- #endif
- }
- #define ULIMIT_BUFFER 32 /* keep 32 extra fd's beyond _ConnLimit */
- /** Learn the maximum allowed number of file descriptors. (Some systems
- * have a low soft limit.
- *
- * We compute this by finding the largest number between <b>limit</b>
- * and <b>cap</b> that we can use. If we can't find a number greater
- * than or equal to <b>limit</b>, then we fail: return -1.
- *
- * Otherwise, return the number minus some buffer to allow for other
- * file descriptors we'll want available for ordinary use. */
- int
- set_max_file_descriptors(unsigned long limit, unsigned long cap)
- {
- #ifndef HAVE_GETRLIMIT
- log_fn(LOG_INFO, LD_NET,
- "This platform is missing getrlimit(). Proceeding.");
- if (limit < cap) {
- log_info(LD_CONFIG, "ConnLimit must be at most %d. Using that.", (int)cap);
- limit = cap;
- }
- #else
- struct rlimit rlim;
- unsigned long most;
- tor_assert(limit > 0);
- tor_assert(cap > 0);
- if (getrlimit(RLIMIT_NOFILE, &rlim) != 0) {
- log_warn(LD_NET, "Could not get maximum number of file descriptors: %s",
- strerror(errno));
- return -1;
- }
- if (rlim.rlim_max < limit) {
- log_warn(LD_CONFIG,"We need %lu file descriptors available, and we're "
- "limited to %lu. Please change your ulimit -n.",
- limit, (unsigned long)rlim.rlim_max);
- return -1;
- }
- most = (rlim.rlim_max > cap) ? cap : (unsigned) rlim.rlim_max;
- if (most > rlim.rlim_cur) {
- log_info(LD_NET,"Raising max file descriptors from %lu to %lu.",
- (unsigned long)rlim.rlim_cur, most);
- }
- rlim.rlim_cur = most;
- if (setrlimit(RLIMIT_NOFILE, &rlim) != 0) {
- log_warn(LD_CONFIG, "Could not set maximum number of file descriptors: %s",
- strerror(errno));
- return -1;
- }
- /* leave some overhead for logs, etc, */
- limit = most;
- #endif
- if (limit < ULIMIT_BUFFER) {
- log_warn(LD_CONFIG,
- "ConnLimit must be at least %d. Failing.", ULIMIT_BUFFER);
- return -1;
- }
- return limit - ULIMIT_BUFFER;
- }
- /** Call setuid and setgid to run as <b>user</b>:<b>group</b>. Return 0 on
- * success. On failure, log and return -1.
- */
- int
- switch_id(const char *user, const char *group)
- {
- #ifndef MS_WINDOWS
- struct passwd *pw = NULL;
- struct group *gr = NULL;
- if (user) {
- pw = getpwnam(user);
- if (pw == NULL) {
- log_warn(LD_CONFIG,"User '%s' not found.", user);
- return -1;
- }
- }
- /* switch the group first, while we still have the privileges to do so */
- if (group) {
- gr = getgrnam(group);
- if (gr == NULL) {
- log_warn(LD_CONFIG,"Group '%s' not found.", group);
- return -1;
- }
- if (setgid(gr->gr_gid) != 0) {
- log_warn(LD_GENERAL,"Error setting to configured GID: %s",
- strerror(errno));
- return -1;
- }
- } else if (user) {
- if (setgid(pw->pw_gid) != 0) {
- log_warn(LD_GENERAL,"Error setting to user GID: %s", strerror(errno));
- return -1;
- }
- }
- /* now that the group is switched, we can switch users and lose
- privileges */
- if (user) {
- if (setuid(pw->pw_uid) != 0) {
- log_warn(LD_GENERAL,"Error setting UID: %s", strerror(errno));
- return -1;
- }
- }
- return 0;
- #endif
- log_warn(LD_CONFIG,
- "User or group specified, but switching users is not supported.");
- return -1;
- }
- #ifdef HAVE_PWD_H
- /** Allocate and return a string containing the home directory for the
- * user <b>username</b>. Only works on posix-like systems */
- char *
- get_user_homedir(const char *username)
- {
- struct passwd *pw;
- tor_assert(username);
- if (!(pw = getpwnam(username))) {
- log_err(LD_CONFIG,"User \"%s\" not found.", username);
- return NULL;
- }
- return tor_strdup(pw->pw_dir);
- }
- #endif
- /** Set *addr to the IP address (in dotted-quad notation) stored in c.
- * Return 1 on success, 0 if c is badly formatted. (Like inet_aton(c,addr),
- * but works on Windows and Solaris.)
- */
- int
- tor_inet_aton(const char *c, struct in_addr* addr)
- {
- #ifdef HAVE_INET_ATON
- return inet_aton(c, addr);
- #else
- uint32_t r;
- tor_assert(c);
- tor_assert(addr);
- if (strcmp(c, "255.255.255.255") == 0) {
- addr->s_addr = 0xFFFFFFFFu;
- return 1;
- }
- r = inet_addr(c);
- if (r == INADDR_NONE)
- return 0;
- addr->s_addr = r;
- return 1;
- #endif
- }
- /** Similar behavior to Unix gethostbyname: resolve <b>name</b>, and set
- * *addr to the proper IP address, in network byte order. Returns 0
- * on success, -1 on failure; 1 on transient failure.
- *
- * (This function exists because standard windows gethostbyname
- * doesn't treat raw IP addresses properly.)
- */
- int
- tor_lookup_hostname(const char *name, uint32_t *addr)
- {
- /* Perhaps eventually this should be replaced by a tor_getaddrinfo or
- * something.
- */
- struct in_addr iaddr;
- tor_assert(name);
- tor_assert(addr);
- if (!*name) {
- /* Empty address is an error. */
- return -1;
- } else if (tor_inet_aton(name, &iaddr)) {
- /* It's an IP. */
- memcpy(addr, &iaddr.s_addr, 4);
- return 0;
- } else {
- #ifdef HAVE_GETADDRINFO
- int err;
- struct addrinfo *res=NULL, *res_p;
- struct addrinfo hints;
- int result = -1;
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = PF_INET;
- hints.ai_socktype = SOCK_STREAM;
- err = getaddrinfo(name, NULL, &hints, &res);
- if (!err) {
- for (res_p = res; res_p; res_p = res_p->ai_next) {
- if (res_p->ai_family == AF_INET) {
- struct sockaddr_in *sin = (struct sockaddr_in *)res_p->ai_addr;
- memcpy(addr, &sin->sin_addr, 4);
- result = 0;
- break;
- }
- }
- freeaddrinfo(res);
- return result;
- }
- return (err == EAI_AGAIN) ? 1 : -1;
- #else
- struct hostent *ent;
- int err;
- #ifdef HAVE_GETHOSTBYNAME_R_6_ARG
- char buf[2048];
- struct hostent hostent;
- int r;
- r = gethostbyname_r(name, &hostent, buf, sizeof(buf), &ent, &err);
- #elif defined(HAVE_GETHOSTBYNAME_R_5_ARG)
- char buf[2048];
- struct hostent hostent;
- ent = gethostbyname_r(name, &hostent, buf, sizeof(buf), &err);
- #elif defined(HAVE_GETHOSTBYNAME_R_3_ARG)
- struct hostent_data data;
- struct hostent hent;
- memset(&data, 0, sizeof(data));
- err = gethostbyname_r(name, &hent, &data);
- ent = err ? NULL : &hent;
- #else
- ent = gethostbyname(name);
- #ifdef MS_WINDOWS
- err = WSAGetLastError();
- #else
- err = h_errno;
- #endif
- #endif
- if (ent) {
- /* break to remind us if we move away from IPv4 */
- tor_assert(ent->h_length == 4);
- memcpy(addr, ent->h_addr, 4);
- return 0;
- }
- memset(addr, 0, 4);
- #ifdef MS_WINDOWS
- return (err == WSATRY_AGAIN) ? 1 : -1;
- #else
- return (err == TRY_AGAIN) ? 1 : -1;
- #endif
- #endif
- }
- }
- /** Hold the result of our call to <b>uname</b>. */
- static char uname_result[256];
- /** True iff uname_result is set. */
- static int uname_result_is_set = 0;
- /** Return a pointer to a description of our platform.
- */
- const char *
- get_uname(void)
- {
- #ifdef HAVE_UNAME
- struct utsname u;
- #endif
- if (!uname_result_is_set) {
- #ifdef HAVE_UNAME
- if (uname(&u) != -1) {
- /* (linux says 0 is success, solaris says 1 is success) */
- tor_snprintf(uname_result, sizeof(uname_result), "%s %s",
- u.sysname, u.machine);
- } else
- #endif
- {
- #ifdef MS_WINDOWS
- OSVERSIONINFOEX info;
- int i;
- unsigned int leftover_mask;
- const char *plat = NULL;
- static struct {
- int major; int minor; const char *version;
- } win_version_table[] = {
- { 6, 0, "Windows \"Longhorn\"" },
- { 5, 2, "Windows Server 2003" },
- { 5, 1, "Windows XP" },
- { 5, 0, "Windows 2000" },
- /* { 4, 0, "Windows NT 4.0" }, */
- { 4, 90, "Windows Me" },
- { 4, 10, "Windows 98" },
- /* { 4, 0, "Windows 95" } */
- { 3, 51, "Windows NT 3.51" },
- { -1, -1, NULL }
- };
- #ifdef VER_SUITE_BACKOFFICE
- static struct {
- unsigned int mask; const char *str;
- } win_mask_table[] = {
- { VER_SUITE_BACKOFFICE, " {backoffice}" },
- { VER_SUITE_BLADE, " {\"blade\" (2003, web edition)}" },
- { VER_SUITE_DATACENTER, " {datacenter}" },
- { VER_SUITE_ENTERPRISE, " {enterprise}" },
- { VER_SUITE_EMBEDDEDNT, " {embedded}" },
- { VER_SUITE_PERSONAL, " {personal}" },
- { VER_SUITE_SINGLEUSERTS,
- " {terminal services, single user}" },
- { VER_SUITE_SMALLBUSINESS, " {small business}" },
- { VER_SUITE_SMALLBUSINESS_RESTRICTED,
- " {small business, restricted}" },
- { VER_SUITE_TERMINAL, " {terminal services}" },
- { 0, NULL },
- };
- #endif
- memset(&info, 0, sizeof(info));
- info.dwOSVersionInfoSize = sizeof(info);
- if (! GetVersionEx((LPOSVERSIONINFO)&info)) {
- strlcpy(uname_result, "Bizarre version of Windows where GetVersionEx"
- " doesn't work.", sizeof(uname_result));
- uname_result_is_set = 1;
- return uname_result;
- }
- if (info.dwMajorVersion == 4 && info.dwMinorVersion == 0) {
- if (info.dwPlatformId == VER_PLATFORM_WIN32_NT)
- plat = "Windows NT 4.0";
- else
- plat = "Windows 95";
- } else {
- for (i=0; win_version_table[i].major>=0; ++i) {
- if (win_version_table[i].major == info.dwMajorVersion &&
- win_version_table[i].minor == info.dwMinorVersion) {
- plat = win_version_table[i].version;
- break;
- }
- }
- }
- if (plat) {
- tor_snprintf(uname_result, sizeof(uname_result), "%s %s",
- plat, info.szCSDVersion);
- } else {
- if (info.dwMajorVersion > 6 ||
- (info.dwMajorVersion==6 && info.dwMinorVersion>0))
- tor_snprintf(uname_result, sizeof(uname_result),
- "Very recent version of Windows [major=%d,minor=%d] %s",
- (int)info.dwMajorVersion,(int)info.dwMinorVersion,
- info.szCSDVersion);
- else
- tor_snprintf(uname_result, sizeof(uname_result),
- "Unrecognized version of Windows [major=%d,minor=%d] %s",
- (int)info.dwMajorVersion,(int)info.dwMinorVersion,
- info.szCSDVersion);
- }
- #ifdef VER_SUITE_BACKOFFICE
- if (info.wProductType == VER_NT_DOMAIN_CONTROLLER) {
- strlcat(uname_result, " [domain controller]", sizeof(uname_result));
- } else if (info.wProductType == VER_NT_SERVER) {
- strlcat(uname_result, " [server]", sizeof(uname_result));
- } else if (info.wProductType == VER_NT_WORKSTATION) {
- strlcat(uname_result, " [workstation]", sizeof(uname_result));
- }
- leftover_mask = info.wSuiteMask;
- for (i = 0; win_mask_table[i].mask; ++i) {
- if (info.wSuiteMask & win_mask_table[i].mask) {
- strlcat(uname_result, win_mask_table[i].str, sizeof(uname_result));
- leftover_mask &= ~win_mask_table[i].mask;
- }
- }
- if (leftover_mask) {
- size_t len = strlen(uname_result);
- tor_snprintf(uname_result+len, sizeof(uname_result)-len,
- " {0x%x}", info.wSuiteMask);
- }
- #endif
- #else
- strlcpy(uname_result, "Unknown platform", sizeof(uname_result));
- #endif
- }
- uname_result_is_set = 1;
- }
- return uname_result;
- }
- /*
- * Process control
- */
- #if defined(USE_PTHREADS)
- /** Wraps a an int (*)(void*) function and its argument so we can
- * invoke them in a way pthreads would expect.
- */
- typedef struct tor_pthread_data_t {
- void (*func)(void *);
- void *data;
- } tor_pthread_data_t;
- /** DOCDOC */
- static void *
- tor_pthread_helper_fn(void *_data)
- {
- tor_pthread_data_t *data = _data;
- void (*func)(void*);
- void *arg;
- func = data->func;
- arg = data->data;
- tor_free(_data);
- func(arg);
- return NULL;
- }
- #endif
- /** Minimalist interface to run a void function in the background. On
- * unix calls fork, on win32 calls beginthread. Returns -1 on failure.
- * func should not return, but rather should call spawn_exit.
- *
- * NOTE: if <b>data</b> is used, it should not be allocated on the stack,
- * since in a multithreaded environment, there is no way to be sure that
- * the caller's stack will still be around when the called function is
- * running.
- */
- int
- spawn_func(void (*func)(void *), void *data)
- {
- #if defined(USE_WIN32_THREADS)
- int rv;
- rv = _beginthread(func, 0, data);
- if (rv == (unsigned long) -1)
- return -1;
- return 0;
- #elif defined(USE_PTHREADS)
- pthread_t thread;
- tor_pthread_data_t *d;
- d = tor_malloc(sizeof(tor_pthread_data_t));
- d->data = data;
- d->func = func;
- if (pthread_create(&thread,NULL,tor_pthread_helper_fn,d))
- return -1;
- if (pthread_detach(thread))
- return -1;
- return 0;
- #else
- pid_t pid;
- pid = fork();
- if (pid<0)
- return -1;
- if (pid==0) {
- /* Child */
- func(data);
- tor_assert(0); /* Should never reach here. */
- return 0; /* suppress "control-reaches-end-of-non-void" warning. */
- } else {
- /* Parent */
- return 0;
- }
- #endif
- }
- /** End the current thread/process.
- */
- void
- spawn_exit(void)
- {
- #if defined(USE_WIN32_THREADS)
- _endthread();
- //we should never get here. my compiler thinks that _endthread returns, this
- //is an attempt to fool it.
- tor_assert(0);
- _exit(0);
- #elif defined(USE_PTHREADS)
- pthread_exit(NULL);
- #else
- /* http://www.erlenstar.demon.co.uk/unix/faq_2.html says we should
- * call _exit, not exit, from child processes. */
- _exit(0);
- #endif
- }
- /** Set *timeval to the current time of day. On error, log and terminate.
- * (Same as gettimeofday(timeval,NULL), but never returns -1.)
- */
- void
- tor_gettimeofday(struct timeval *timeval)
- {
- #ifdef MS_WINDOWS
- /* Epoch bias copied from perl: number of units between windows epoch and
- * unix epoch. */
- #define EPOCH_BIAS U64_LITERAL(116444736000000000)
- #define UNITS_PER_SEC U64_LITERAL(10000000)
- #define USEC_PER_SEC U64_LITERAL(1000000)
- #define UNITS_PER_USEC U64_LITERAL(10)
- union {
- uint64_t ft_64;
- FILETIME ft_ft;
- } ft;
- /* number of 100-nsec units since Jan 1, 1601 */
- GetSystemTimeAsFileTime(&ft.ft_ft);
- if (ft.ft_64 < EPOCH_BIAS) {
- log_err(LD_GENERAL,"System time is before 1970; failing.");
- exit(1);
- }
- ft.ft_64 -= EPOCH_BIAS;
- timeval->tv_sec = (unsigned) (ft.ft_64 / UNITS_PER_SEC);
- timeval->tv_usec = (unsigned) ((ft.ft_64 / UNITS_PER_USEC) % USEC_PER_SEC);
- #elif defined(HAVE_GETTIMEOFDAY)
- if (gettimeofday(timeval, NULL)) {
- log_err(LD_GENERAL,"gettimeofday failed.");
- /* If gettimeofday dies, we have either given a bad timezone (we didn't),
- or segfaulted.*/
- exit(1);
- }
- #elif defined(HAVE_FTIME)
- struct timeb tb;
- ftime(&tb);
- timeval->tv_sec = tb.time;
- timeval->tv_usec = tb.millitm * 1000;
- #else
- #error "No way to get time."
- #endif
- return;
- }
- #if defined(TOR_IS_MULTITHREADED) && !defined(MS_WINDOWS)
- /** Defined iff we need to add locks when defining fake versions of reentrant
- * versions of time-related functions. */
- #define TIME_FNS_NEED_LOCKS
- #endif
- #ifndef HAVE_LOCALTIME_R
- #ifdef TIME_FNS_NEED_LOCKS
- struct tm *
- tor_localtime_r(const time_t *timep, struct tm *result)
- {
- struct tm *r;
- static tor_mutex_t *m=NULL;
- if (!m) { m=tor_mutex_new(); }
- tor_assert(result);
- tor_mutex_acquire(m);
- r = localtime(timep);
- memcpy(result, r, sizeof(struct tm));
- tor_mutex_release(m);
- return result;
- }
- #else
- struct tm *
- tor_localtime_r(const time_t *timep, struct tm *result)
- {
- struct tm *r;
- tor_assert(result);
- r = localtime(timep);
- memcpy(result, r, sizeof(struct tm));
- return result;
- }
- #endif
- #endif
- #ifndef HAVE_GMTIME_R
- #ifdef TIME_FNS_NEED_LOCKS
- struct tm *
- tor_gmtime_r(const time_t *timep, struct tm *result)
- {
- struct tm *r;
- static tor_mutex_t *m=NULL;
- if (!m) { m=tor_mutex_new(); }
- tor_assert(result);
- tor_mutex_acquire(m);
- r = gmtime(timep);
- memcpy(result, r, sizeof(struct tm));
- tor_mutex_release(m);
- return result;
- }
- #else
- struct tm *
- tor_gmtime_r(const time_t *timep, struct tm *result)
- {
- struct tm *r;
- tor_assert(result);
- r = gmtime(timep);
- memcpy(result, r, sizeof(struct tm));
- return result;
- }
- #endif
- #endif
- #ifdef USE_WIN32_THREADS
- /** A generic lock structure for multithreaded builds. */
- struct tor_mutex_t {
- HANDLE handle;
- };
- tor_mutex_t *
- tor_mutex_new(void)
- {
- tor_mutex_t *m;
- m = tor_malloc_zero(sizeof(tor_mutex_t));
- m->handle = CreateMutex(NULL, FALSE, NULL);
- tor_assert(m->handle != NULL);
- return m;
- }
- void
- tor_mutex_free(tor_mutex_t *m)
- {
- CloseHandle(m->handle);
- tor_free(m);
- }
- void
- tor_mutex_acquire(tor_mutex_t *m)
- {
- DWORD r;
- r = WaitForSingleObject(m->handle, INFINITE);
- switch (r) {
- case WAIT_ABANDONED: /* holding thread exited. */
- case WAIT_OBJECT_0: /* we got the mutex normally. */
- break;
- case WAIT_TIMEOUT: /* Should never happen. */
- tor_assert(0);
- break;
- case WAIT_FAILED:
- log_warn(LD_GENERAL, "Failed to acquire mutex: %d",(int) GetLastError());
- }
- }
- void
- tor_mutex_release(tor_mutex_t *m)
- {
- BOOL r;
- r = ReleaseMutex(m->handle);
- if (!r) {
- log_warn(LD_GENERAL, "Failed to release mutex: %d", (int) GetLastError());
- }
- }
- unsigned long
- tor_get_thread_id(void)
- {
- return (unsigned long)GetCurrentThreadId();
- }
- #elif defined(USE_PTHREADS)
- /** A generic lock structure for multithreaded builds. */
- struct tor_mutex_t {
- pthread_mutex_t mutex;
- };
- /** DOCDOC */
- tor_mutex_t *
- tor_mutex_new(void)
- {
- tor_mutex_t *mutex = tor_malloc_zero(sizeof(tor_mutex_t));
- pthread_mutex_init(&mutex->mutex, NULL);
- return mutex;
- }
- /** DOCDOC */
- void
- tor_mutex_acquire(tor_mutex_t *m)
- {
- tor_assert(m);
- pthread_mutex_lock(&m->mutex);
- }
- /** DOCDOC */
- void
- tor_mutex_release(tor_mutex_t *m)
- {
- tor_assert(m);
- pthread_mutex_unlock(&m->mutex);
- }
- /** DOCDOC */
- void
- tor_mutex_free(tor_mutex_t *m)
- {
- tor_assert(m);
- pthread_mutex_destroy(&m->mutex);
- tor_free(m);
- }
- /** DOCDOC */
- unsigned long
- tor_get_thread_id(void)
- {
- union {
- pthread_t thr;
- unsigned long id;
- } r;
- r.thr = pthread_self();
- return r.id;
- }
- #else
- /** A generic lock structure for multithreaded builds. */
- struct tor_mutex_t {
- int _unused;
- };
- #endif
- /**
- * On Windows, WSAEWOULDBLOCK is not always correct: when you see it,
- * you need to ask the socket for its actual errno. Also, you need to
- * get your errors from WSAGetLastError, not errno. (If you supply a
- * socket of -1, we check WSAGetLastError, but don't correct
- * WSAEWOULDBLOCKs.)
- *
- * The upshot of all of this is that when a socket call fails, you
- * should call tor_socket_errno <em>at most once</em> on the failing
- * socket to get the error.
- */
- #if defined(MS_WINDOWS) && !defined(USE_BSOCKETS)
- int
- tor_socket_errno(int 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
- #if defined(MS_WINDOWS) && !defined(USE_BSOCKETS)
- #define E(code, s) { code, (s " [" #code " ]") }
- 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 },
- };
- /** There does not seem to be a strerror equivalent for winsock errors.
- * Naturally, we have to roll our own.
- */
- const char *
- tor_socket_strerror(int e)
- {
- int i;
- for (i=0; windows_socket_errors[i].code >= 0; ++i) {
- if (e == windows_socket_errors[i].code)
- return windows_socket_errors[i].msg;
- }
- return strerror(e);
- }
- #endif
- /** Called before we make any calls to network-related functions.
- * (Some operating systems require their network libraries to be
- * initialized.) */
- int
- network_init(void)
- {
- #ifdef MS_WINDOWS
- /* This silly exercise is necessary before windows will allow
- * gethostbyname to work. */
- WSADATA WSAData;
- int r;
- r = WSAStartup(0x101,&WSAData);
- if (r) {
- log_warn(LD_NET,"Error initializing windows network layer: code was %d",r);
- return -1;
- }
- /* WSAData.iMaxSockets might show the max sockets we're allowed to use.
- * We might use it to complain if we're trying to be a server but have
- * too few sockets available. */
- #endif
- return 0;
- }
- #ifdef MS_WINDOWS
- /** Return a newly allocated string describing the windows system error code
- * <b>err</b>. Note that error codes are different from errno. Error codes
- * come from GetLastError() when a winapi call fails. errno is set only when
- * ansi functions fail. Whee. */
- char *
- format_win32_error(DWORD err)
- {
- LPVOID str = NULL;
- char *result;
- /* Somebody once decided that this interface was better than strerror(). */
- FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
- FORMAT_MESSAGE_FROM_SYSTEM |
- FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, err,
- MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
- (LPTSTR) &str,
- 0, NULL);
- if (str) {
- result = tor_strdup((char*)str);
- LocalFree(str); /* LocalFree != free() */
- } else {
- result = tor_strdup("<unformattable error>");
- }
- return result;
- }
- #endif
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