Annotation of embedaddon/libevent/evutil.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2007 Niels Provos <provos@citi.umich.edu>
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. The name of the author may not be used to endorse or promote products
14: * derived from this software without specific prior written permission.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27: #ifdef HAVE_CONFIG_H
28: #include "config.h"
29: #endif
30:
31: #ifdef WIN32
32: #include <winsock2.h>
33: #define WIN32_LEAN_AND_MEAN
34: #include <windows.h>
35: #undef WIN32_LEAN_AND_MEAN
36: #endif
37:
38: #include <sys/types.h>
39: #ifdef HAVE_SYS_SOCKET_H
40: #include <sys/socket.h>
41: #endif
42: #ifdef HAVE_UNISTD_H
43: #include <unistd.h>
44: #endif
45: #ifdef HAVE_FCNTL_H
46: #include <fcntl.h>
47: #endif
48: #ifdef HAVE_STDLIB_H
49: #include <stdlib.h>
50: #endif
51: #include <errno.h>
52: #if defined WIN32 && !defined(HAVE_GETTIMEOFDAY_H)
53: #include <sys/timeb.h>
54: #endif
55: #include <stdio.h>
56: #include <signal.h>
57:
58: #include <sys/queue.h>
59: #include "event.h"
60: #include "event-internal.h"
61: #include "evutil.h"
62: #include "log.h"
63:
64: int
65: evutil_socketpair(int family, int type, int protocol, int fd[2])
66: {
67: #ifndef WIN32
68: return socketpair(family, type, protocol, fd);
69: #else
70: /* This code is originally from Tor. Used with permission. */
71:
72: /* This socketpair does not work when localhost is down. So
73: * it's really not the same thing at all. But it's close enough
74: * for now, and really, when localhost is down sometimes, we
75: * have other problems too.
76: */
77: int listener = -1;
78: int connector = -1;
79: int acceptor = -1;
80: struct sockaddr_in listen_addr;
81: struct sockaddr_in connect_addr;
82: int size;
83: int saved_errno = -1;
84:
85: if (protocol
86: #ifdef AF_UNIX
87: || family != AF_UNIX
88: #endif
89: ) {
90: EVUTIL_SET_SOCKET_ERROR(WSAEAFNOSUPPORT);
91: return -1;
92: }
93: if (!fd) {
94: EVUTIL_SET_SOCKET_ERROR(WSAEINVAL);
95: return -1;
96: }
97:
98: listener = socket(AF_INET, type, 0);
99: if (listener < 0)
100: return -1;
101: memset(&listen_addr, 0, sizeof(listen_addr));
102: listen_addr.sin_family = AF_INET;
103: listen_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
104: listen_addr.sin_port = 0; /* kernel chooses port. */
105: if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr))
106: == -1)
107: goto tidy_up_and_fail;
108: if (listen(listener, 1) == -1)
109: goto tidy_up_and_fail;
110:
111: connector = socket(AF_INET, type, 0);
112: if (connector < 0)
113: goto tidy_up_and_fail;
114: /* We want to find out the port number to connect to. */
115: size = sizeof(connect_addr);
116: if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1)
117: goto tidy_up_and_fail;
118: if (size != sizeof (connect_addr))
119: goto abort_tidy_up_and_fail;
120: if (connect(connector, (struct sockaddr *) &connect_addr,
121: sizeof(connect_addr)) == -1)
122: goto tidy_up_and_fail;
123:
124: size = sizeof(listen_addr);
125: acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size);
126: if (acceptor < 0)
127: goto tidy_up_and_fail;
128: if (size != sizeof(listen_addr))
129: goto abort_tidy_up_and_fail;
130: EVUTIL_CLOSESOCKET(listener);
131: /* Now check we are talking to ourself by matching port and host on the
132: two sockets. */
133: if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1)
134: goto tidy_up_and_fail;
135: if (size != sizeof (connect_addr)
136: || listen_addr.sin_family != connect_addr.sin_family
137: || listen_addr.sin_addr.s_addr != connect_addr.sin_addr.s_addr
138: || listen_addr.sin_port != connect_addr.sin_port)
139: goto abort_tidy_up_and_fail;
140: fd[0] = connector;
141: fd[1] = acceptor;
142:
143: return 0;
144:
145: abort_tidy_up_and_fail:
146: saved_errno = WSAECONNABORTED;
147: tidy_up_and_fail:
148: if (saved_errno < 0)
149: saved_errno = WSAGetLastError();
150: if (listener != -1)
151: EVUTIL_CLOSESOCKET(listener);
152: if (connector != -1)
153: EVUTIL_CLOSESOCKET(connector);
154: if (acceptor != -1)
155: EVUTIL_CLOSESOCKET(acceptor);
156:
157: EVUTIL_SET_SOCKET_ERROR(saved_errno);
158: return -1;
159: #endif
160: }
161:
162: int
163: evutil_make_socket_nonblocking(int fd)
164: {
165: #ifdef WIN32
166: {
167: unsigned long nonblocking = 1;
168: ioctlsocket(fd, FIONBIO, (unsigned long*) &nonblocking);
169: }
170: #else
171: {
172: long flags;
173: if ((flags = fcntl(fd, F_GETFL, NULL)) < 0) {
174: event_warn("fcntl(%d, F_GETFL)", fd);
175: return -1;
176: }
177: if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
178: event_warn("fcntl(%d, F_SETFL)", fd);
179: return -1;
180: }
181: }
182: #endif
183: return 0;
184: }
185:
186: ev_int64_t
187: evutil_strtoll(const char *s, char **endptr, int base)
188: {
189: #ifdef HAVE_STRTOLL
190: return (ev_int64_t)strtoll(s, endptr, base);
191: #elif SIZEOF_LONG == 8
192: return (ev_int64_t)strtol(s, endptr, base);
193: #elif defined(WIN32) && defined(_MSC_VER) && _MSC_VER < 1300
194: /* XXXX on old versions of MS APIs, we only support base
195: * 10. */
196: ev_int64_t r;
197: if (base != 10)
198: return 0;
199: r = (ev_int64_t) _atoi64(s);
200: while (isspace(*s))
201: ++s;
202: while (isdigit(*s))
203: ++s;
204: if (endptr)
205: *endptr = (char*) s;
206: return r;
207: #elif defined(WIN32)
208: return (ev_int64_t) _strtoi64(s, endptr, base);
209: #else
210: #error "I don't know how to parse 64-bit integers."
211: #endif
212: }
213:
214: #ifndef _EVENT_HAVE_GETTIMEOFDAY
215: int
216: evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
217: {
218: struct _timeb tb;
219:
220: if(tv == NULL)
221: return -1;
222:
223: _ftime(&tb);
224: tv->tv_sec = (long) tb.time;
225: tv->tv_usec = ((int) tb.millitm) * 1000;
226: return 0;
227: }
228: #endif
229:
230: int
231: evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
232: {
233: int r;
234: va_list ap;
235: va_start(ap, format);
236: r = evutil_vsnprintf(buf, buflen, format, ap);
237: va_end(ap);
238: return r;
239: }
240:
241: int
242: evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
243: {
244: #ifdef _MSC_VER
245: int r = _vsnprintf(buf, buflen, format, ap);
246: buf[buflen-1] = '\0';
247: if (r >= 0)
248: return r;
249: else
250: return _vscprintf(format, ap);
251: #else
252: int r = vsnprintf(buf, buflen, format, ap);
253: buf[buflen-1] = '\0';
254: return r;
255: #endif
256: }
257:
258: static int
259: evutil_issetugid(void)
260: {
261: #ifdef _EVENT_HAVE_ISSETUGID
262: return issetugid();
263: #else
264:
265: #ifdef _EVENT_HAVE_GETEUID
266: if (getuid() != geteuid())
267: return 1;
268: #endif
269: #ifdef _EVENT_HAVE_GETEGID
270: if (getgid() != getegid())
271: return 1;
272: #endif
273: return 0;
274: #endif
275: }
276:
277: const char *
278: evutil_getenv(const char *varname)
279: {
280: if (evutil_issetugid())
281: return NULL;
282:
283: return getenv(varname);
284: }
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