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
evutil_socketpair(int family,int type,int protocol,int fd[2])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
evutil_make_socket_nonblocking(int fd)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 if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
172 event_warn("fcntl(O_NONBLOCK)");
173 return -1;
174 }
175 #endif
176 return 0;
177 }
178
179 ev_int64_t
evutil_strtoll(const char * s,char ** endptr,int base)180 evutil_strtoll(const char *s, char **endptr, int base)
181 {
182 #ifdef HAVE_STRTOLL
183 return (ev_int64_t)strtoll(s, endptr, base);
184 #elif SIZEOF_LONG == 8
185 return (ev_int64_t)strtol(s, endptr, base);
186 #elif defined(WIN32) && defined(_MSC_VER) && _MSC_VER < 1300
187 /* XXXX on old versions of MS APIs, we only support base
188 * 10. */
189 ev_int64_t r;
190 if (base != 10)
191 return 0;
192 r = (ev_int64_t) _atoi64(s);
193 while (isspace(*s))
194 ++s;
195 while (isdigit(*s))
196 ++s;
197 if (endptr)
198 *endptr = (char*) s;
199 return r;
200 #elif defined(WIN32)
201 return (ev_int64_t) _strtoi64(s, endptr, base);
202 #else
203 #error "I don't know how to parse 64-bit integers."
204 #endif
205 }
206
207 #ifndef _EVENT_HAVE_GETTIMEOFDAY
208 int
evutil_gettimeofday(struct timeval * tv,struct timezone * tz)209 evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
210 {
211 struct _timeb tb;
212
213 if(tv == NULL)
214 return -1;
215
216 _ftime(&tb);
217 tv->tv_sec = (long) tb.time;
218 tv->tv_usec = ((int) tb.millitm) * 1000;
219 return 0;
220 }
221 #endif
222
223 int
evutil_snprintf(char * buf,size_t buflen,const char * format,...)224 evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
225 {
226 int r;
227 va_list ap;
228 va_start(ap, format);
229 r = evutil_vsnprintf(buf, buflen, format, ap);
230 va_end(ap);
231 return r;
232 }
233
234 int
evutil_vsnprintf(char * buf,size_t buflen,const char * format,va_list ap)235 evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
236 {
237 #ifdef _MSC_VER
238 int r = _vsnprintf(buf, buflen, format, ap);
239 buf[buflen-1] = '\0';
240 if (r >= 0)
241 return r;
242 else
243 return _vscprintf(format, ap);
244 #else
245 int r = vsnprintf(buf, buflen, format, ap);
246 buf[buflen-1] = '\0';
247 return r;
248 #endif
249 }
250
251 static int
evutil_issetugid(void)252 evutil_issetugid(void)
253 {
254 #ifdef _EVENT_HAVE_ISSETUGID
255 return issetugid();
256 #else
257
258 #ifdef _EVENT_HAVE_GETEUID
259 if (getuid() != geteuid())
260 return 1;
261 #endif
262 #ifdef _EVENT_HAVE_GETEGID
263 if (getgid() != getegid())
264 return 1;
265 #endif
266 return 0;
267 #endif
268 }
269
270 const char *
evutil_getenv(const char * varname)271 evutil_getenv(const char *varname)
272 {
273 if (evutil_issetugid())
274 return NULL;
275
276 return getenv(varname);
277 }
278