1 /*
2 * MUSCLE SmartCard Development ( https://pcsclite.apdu.fr/ )
3 *
4 * Copyright (C) 2006-2011
5 * Ludovic Rousseau <ludovic.rousseau@free.fr>
6 *
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions
9 are met:
10
11 1. Redistributions of source code must retain the above copyright
12 notice, this list of conditions and the following disclaimer.
13 2. Redistributions in binary form must reproduce the above copyright
14 notice, this list of conditions and the following disclaimer in the
15 documentation and/or other materials provided with the distribution.
16 3. The name of the author may not be used to endorse or promote products
17 derived from this software without specific prior written permission.
18
19 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /**
32 * @file
33 * @brief utility functions
34 */
35
36 #include <stdio.h>
37 #include <sys/types.h>
38 #include <unistd.h>
39 #include <errno.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <signal.h>
43 #include <dirent.h>
44 #include <fcntl.h>
45 #include <pthread.h>
46
47 #include "config.h"
48 #include "debuglog.h"
49 #include "utils.h"
50 #include "pcscd.h"
51 #include "sys_generic.h"
52
53 #ifndef LIBPCSCLITE
GetDaemonPid(void)54 pid_t GetDaemonPid(void)
55 {
56 int fd;
57 pid_t pid;
58
59 /* pids are only 15 bits but 4294967296
60 * (32 bits in case of a new system use it) is on 10 bytes
61 */
62 fd = open(PCSCLITE_RUN_PID, O_RDONLY);
63 if (fd >= 0)
64 {
65 char pid_ascii[PID_ASCII_SIZE];
66 ssize_t r;
67
68 r = read(fd, pid_ascii, sizeof pid_ascii);
69 if (r < 0)
70 {
71 Log2(PCSC_LOG_CRITICAL, "Reading " PCSCLITE_RUN_PID " failed: %s",
72 strerror(errno));
73 pid = -1;
74 }
75 else
76 pid = atoi(pid_ascii);
77 (void)close(fd);
78
79 }
80 else
81 {
82 Log2(PCSC_LOG_CRITICAL, "Can't open " PCSCLITE_RUN_PID ": %s",
83 strerror(errno));
84 return -1;
85 }
86
87 return pid;
88 } /* GetDaemonPid */
89
SendHotplugSignal(void)90 int SendHotplugSignal(void)
91 {
92 pid_t pid;
93
94 pid = GetDaemonPid();
95
96 if (pid != -1)
97 {
98 Log2(PCSC_LOG_INFO, "Send hotplug signal to pcscd (pid=%ld)",
99 (long)pid);
100 if (kill(pid, SIGUSR1) < 0)
101 {
102 Log3(PCSC_LOG_CRITICAL, "Can't signal pcscd (pid=%ld): %s",
103 (long)pid, strerror(errno));
104 return EXIT_FAILURE ;
105 }
106 (void)SYS_Sleep(1);
107 }
108
109 return EXIT_SUCCESS;
110 } /* SendHotplugSignal */
111
112 /**
113 * Check is OpenCT is running and display a critical message if it is
114 *
115 * The first cause of pcsc-lite failure is that OpenCT is installed and running
116 * and has already claimed the USB device. In that case RFAddReader() fails
117 * and I get a user support request
118 */
119 #define OPENCT_FILE "/var/run/openct/status"
CheckForOpenCT(void)120 int CheckForOpenCT(void)
121 {
122 struct stat buf;
123
124 if (0 == stat(OPENCT_FILE, &buf))
125 {
126 Log1(PCSC_LOG_CRITICAL, "File " OPENCT_FILE " found. Remove OpenCT and try again");
127 return 1;
128 }
129
130 return 0;
131 } /* CheckForOpenCT */
132 #endif
133
134 /**
135 * return the difference (as long int) in µs between 2 struct timeval
136 * r = a - b
137 */
time_sub(struct timeval * a,struct timeval * b)138 long int time_sub(struct timeval *a, struct timeval *b)
139 {
140 struct timeval r;
141 r.tv_sec = a -> tv_sec - b -> tv_sec;
142 r.tv_usec = a -> tv_usec - b -> tv_usec;
143 if (r.tv_usec < 0)
144 {
145 r.tv_sec--;
146 r.tv_usec += 1000000;
147 }
148
149 return r.tv_sec * 1000000 + r.tv_usec;
150 } /* time_sub */
151
152 #ifndef LIBPCSCLITE
ThreadCreate(pthread_t * pthThread,int attributes,PCSCLITE_THREAD_FUNCTION (pvFunction),LPVOID pvArg)153 int ThreadCreate(pthread_t * pthThread, int attributes,
154 PCSCLITE_THREAD_FUNCTION(pvFunction), LPVOID pvArg)
155 {
156 pthread_attr_t attr;
157 size_t stack_size;
158 int ret;
159
160 ret = pthread_attr_init(&attr);
161 if (ret)
162 return ret;
163
164 ret = pthread_attr_setdetachstate(&attr,
165 attributes & THREAD_ATTR_DETACHED ? PTHREAD_CREATE_DETACHED : PTHREAD_CREATE_JOINABLE);
166 if (ret)
167 goto error;
168
169 /* stack size of 0x40000 (256 KB) bytes minimum for musl C lib */
170 ret = pthread_attr_getstacksize(&attr, &stack_size);
171 if (ret)
172 goto error;
173
174 /* A stack_size of 0 indicates the default size on Solaris.
175 * The default size is more than 256 KB so do not shrink it. */
176 if ((stack_size != 0) && (stack_size < 0x40000))
177 {
178 stack_size = 0x40000;
179 ret = pthread_attr_setstacksize(&attr, stack_size);
180 if (ret)
181 goto error;
182 }
183
184 ret = pthread_create(pthThread, &attr, pvFunction, pvArg);
185
186 error:
187 pthread_attr_destroy(&attr);
188 return ret;
189 }
190 #endif
191