1 |
/* |
2 |
* Cisco C7200 (Predator) simulation platform. |
3 |
* Copyright (c) 2005,2006 Christophe Fillot. All rights reserved. |
4 |
* |
5 |
* Utility functions. |
6 |
*/ |
7 |
|
8 |
#define _GNU_SOURCE |
9 |
#include <stdio.h> |
10 |
#include <stdlib.h> |
11 |
#include <string.h> |
12 |
#include <stdarg.h> |
13 |
#include <unistd.h> |
14 |
#include <time.h> |
15 |
#include <signal.h> |
16 |
#include <sys/time.h> |
17 |
#include <sys/ioctl.h> |
18 |
#include <sys/types.h> |
19 |
#include <sys/socket.h> |
20 |
#include <arpa/inet.h> |
21 |
#include <netdb.h> |
22 |
#include <fcntl.h> |
23 |
#include <errno.h> |
24 |
#include <assert.h> |
25 |
#ifdef __CYGWIN__ |
26 |
#include <malloc.h> |
27 |
#endif |
28 |
|
29 |
#include "utils.h" |
30 |
|
31 |
extern FILE *log_file; |
32 |
|
33 |
/* Add an element to a list */ |
34 |
m_list_t *m_list_add(m_list_t **head,void *data) |
35 |
{ |
36 |
m_list_t *item; |
37 |
|
38 |
if ((item = malloc(sizeof(*item))) != NULL) { |
39 |
item->data = data; |
40 |
item->next = *head; |
41 |
*head = item; |
42 |
} |
43 |
|
44 |
return item; |
45 |
} |
46 |
|
47 |
/* Dynamic sprintf */ |
48 |
char *dyn_sprintf(const char *fmt,...) |
49 |
{ |
50 |
int n,size = 512; |
51 |
va_list ap; |
52 |
char *p,*p2; |
53 |
|
54 |
if ((p = malloc(size)) == NULL) { |
55 |
perror("dyn_sprintf: malloc"); |
56 |
return NULL; |
57 |
} |
58 |
|
59 |
for(;;) |
60 |
{ |
61 |
/* Try to print in the allocated space */ |
62 |
va_start(ap,fmt); |
63 |
n = vsnprintf(p,size,fmt,ap); |
64 |
va_end(ap); |
65 |
|
66 |
/* If that worked, return the string */ |
67 |
if ((n > -1) && (n < size)) |
68 |
return p; |
69 |
|
70 |
/* Else try again with more space. */ |
71 |
if (n > -1) |
72 |
size = n + 1; |
73 |
else |
74 |
size *= 2; |
75 |
|
76 |
if ((p2 = realloc(p,size)) == NULL) { |
77 |
perror("dyn_sprintf: realloc"); |
78 |
free(p); |
79 |
return NULL; |
80 |
} |
81 |
|
82 |
p = p2; |
83 |
} |
84 |
} |
85 |
|
86 |
/* Split a string */ |
87 |
int m_strsplit(char *str,char delim,char **array,int max_count) |
88 |
{ |
89 |
int i,pos = 0; |
90 |
size_t len; |
91 |
char *ptr; |
92 |
|
93 |
for(i=0;i<max_count;i++) |
94 |
array[i] = NULL; |
95 |
|
96 |
do { |
97 |
if (pos == max_count) |
98 |
goto error; |
99 |
|
100 |
ptr = strchr(str,delim); |
101 |
if (!ptr) |
102 |
ptr = str + strlen(str); |
103 |
|
104 |
len = ptr - str; |
105 |
|
106 |
if (!(array[pos] = malloc(len+1))) |
107 |
goto error; |
108 |
|
109 |
memcpy(array[pos],str,len); |
110 |
array[pos][len] = 0; |
111 |
|
112 |
str = ptr + 1; |
113 |
pos++; |
114 |
}while(*ptr); |
115 |
|
116 |
return(pos); |
117 |
|
118 |
error: |
119 |
for(i=0;i<max_count;i++) |
120 |
free(array[i]); |
121 |
return(-1); |
122 |
} |
123 |
|
124 |
/* Tokenize a string */ |
125 |
int m_strtok(char *str,char delim,char **array,int max_count) |
126 |
{ |
127 |
int i,pos = 0; |
128 |
size_t len; |
129 |
char *ptr; |
130 |
|
131 |
for(i=0;i<max_count;i++) |
132 |
array[i] = NULL; |
133 |
|
134 |
do { |
135 |
if (pos == max_count) |
136 |
goto error; |
137 |
|
138 |
ptr = strchr(str,delim); |
139 |
if (!ptr) |
140 |
ptr = str + strlen(str); |
141 |
|
142 |
len = ptr - str; |
143 |
|
144 |
if (!(array[pos] = malloc(len+1))) |
145 |
goto error; |
146 |
|
147 |
memcpy(array[pos],str,len); |
148 |
array[pos][len] = 0; |
149 |
|
150 |
while(*ptr == delim) |
151 |
ptr++; |
152 |
|
153 |
str = ptr; |
154 |
pos++; |
155 |
}while(*ptr); |
156 |
|
157 |
return(pos); |
158 |
|
159 |
error: |
160 |
for(i=0;i<max_count;i++) |
161 |
free(array[i]); |
162 |
return(-1); |
163 |
} |
164 |
|
165 |
/* Quote a string */ |
166 |
char *m_strquote(char *buffer,size_t buf_len,char *str) |
167 |
{ |
168 |
char *p; |
169 |
|
170 |
if (!(p = strpbrk(str," \t\"'"))) |
171 |
return str; |
172 |
|
173 |
snprintf(buffer,buf_len,"\"%s\"",str); |
174 |
return buffer; |
175 |
} |
176 |
|
177 |
/* Ugly function that dumps a structure in hexa and ascii. */ |
178 |
void mem_dump(FILE *f_output,u_char *pkt,u_int len) |
179 |
{ |
180 |
u_int x,i = 0, tmp; |
181 |
|
182 |
while (i < len) |
183 |
{ |
184 |
if ((len - i) > 16) |
185 |
x = 16; |
186 |
else x = len - i; |
187 |
|
188 |
fprintf(f_output,"%4.4x: ",i); |
189 |
|
190 |
for (tmp=0;tmp<x;tmp++) |
191 |
fprintf(f_output,"%2.2x ",pkt[i+tmp]); |
192 |
for (tmp=x;tmp<16;tmp++) fprintf(f_output," "); |
193 |
|
194 |
for (tmp=0;tmp<x;tmp++) { |
195 |
char c = pkt[i+tmp]; |
196 |
|
197 |
if (((c >= 'A') && (c <= 'Z')) || |
198 |
((c >= 'a') && (c <= 'z')) || |
199 |
((c >= '0') && (c <= '9'))) |
200 |
fprintf(f_output,"%c",c); |
201 |
else |
202 |
fputs(".",f_output); |
203 |
} |
204 |
|
205 |
i += x; |
206 |
fprintf(f_output,"\n"); |
207 |
} |
208 |
|
209 |
fprintf(f_output,"\n"); |
210 |
} |
211 |
|
212 |
/* Logging function */ |
213 |
void m_flog(FILE *fd,char *module,char *fmt,va_list ap) |
214 |
{ |
215 |
struct timeval now; |
216 |
static char buf[256]; |
217 |
time_t ct; |
218 |
|
219 |
gettimeofday(&now,0); |
220 |
ct = now.tv_sec; |
221 |
strftime(buf,sizeof(buf),"%b %d %H:%M:%S",localtime(&ct)); |
222 |
if (fd) { |
223 |
fprintf(fd,"%s.%03ld %s: ",buf,(long)now.tv_usec/1000,module); |
224 |
vfprintf(fd,fmt,ap); |
225 |
fflush(fd); |
226 |
} |
227 |
} |
228 |
|
229 |
/* Logging function */ |
230 |
void m_log(char *module,char *fmt,...) |
231 |
{ |
232 |
va_list ap; |
233 |
|
234 |
va_start(ap,fmt); |
235 |
m_flog(log_file,module,fmt,ap); |
236 |
va_end(ap); |
237 |
} |
238 |
|
239 |
/* Returns a line from specified file (remove trailing '\n') */ |
240 |
char *m_fgets(char *buffer,int size,FILE *fd) |
241 |
{ |
242 |
int len; |
243 |
|
244 |
buffer[0] = '\0'; |
245 |
fgets(buffer,size,fd); |
246 |
|
247 |
if ((len = strlen(buffer)) == 0) |
248 |
return NULL; |
249 |
|
250 |
/* remove trailing '\n' */ |
251 |
if (buffer[len-1] == '\n') |
252 |
buffer[len-1] = '\0'; |
253 |
|
254 |
return buffer; |
255 |
} |
256 |
|
257 |
/* Read a file and returns it in a buffer */ |
258 |
ssize_t m_read_file(char *filename,char **buffer) |
259 |
{ |
260 |
char tmp[256],*ptr,*nptr; |
261 |
size_t len,tot_len; |
262 |
FILE *fd; |
263 |
|
264 |
*buffer = ptr = NULL; |
265 |
tot_len = 0; |
266 |
|
267 |
/* Open file for reading */ |
268 |
if ((fd = fopen(filename,"r")) == NULL) |
269 |
return(-1); |
270 |
|
271 |
while((len = fread(tmp,1,sizeof(tmp),fd)) > 0) |
272 |
{ |
273 |
/* Reallocate memory */ |
274 |
nptr = realloc(ptr,tot_len+len+1); |
275 |
if (nptr == NULL) { |
276 |
if (ptr) free(ptr); |
277 |
fclose(fd); |
278 |
return(-1); |
279 |
} |
280 |
|
281 |
ptr = nptr; |
282 |
|
283 |
/* Ok, memory could be allocated */ |
284 |
memcpy(&ptr[tot_len],tmp,len); |
285 |
tot_len += len; |
286 |
} |
287 |
|
288 |
fclose(fd); |
289 |
*buffer = ptr; |
290 |
return(tot_len); |
291 |
} |
292 |
|
293 |
/* Allocate aligned memory */ |
294 |
void *m_memalign(size_t boundary,size_t size) |
295 |
{ |
296 |
void *p; |
297 |
|
298 |
#ifdef __linux__ |
299 |
if (posix_memalign((void *)&p,boundary,size)) |
300 |
#else |
301 |
#if defined(__CYGWIN__) || defined(SUNOS) |
302 |
if (!(p = memalign(boundary,size))) |
303 |
#else |
304 |
if (!(p = malloc(size))) |
305 |
#endif |
306 |
#endif |
307 |
return NULL; |
308 |
|
309 |
assert(((m_iptr_t)p & (boundary-1)) == 0); |
310 |
return p; |
311 |
} |
312 |
|
313 |
/* Block specified signal for calling thread */ |
314 |
int m_signal_block(int sig) |
315 |
{ |
316 |
sigset_t sig_mask; |
317 |
sigemptyset(&sig_mask); |
318 |
sigaddset(&sig_mask,sig); |
319 |
return(pthread_sigmask(SIG_BLOCK,&sig_mask,NULL)); |
320 |
} |
321 |
|
322 |
/* Unblock specified signal for calling thread */ |
323 |
int m_signal_unblock(int sig) |
324 |
{ |
325 |
sigset_t sig_mask; |
326 |
sigemptyset(&sig_mask); |
327 |
sigaddset(&sig_mask,sig); |
328 |
return(pthread_sigmask(SIG_UNBLOCK,&sig_mask,NULL)); |
329 |
} |
330 |
|
331 |
/* Set non-blocking mode on a file descriptor */ |
332 |
int m_fd_set_non_block(int fd) |
333 |
{ |
334 |
int flags; |
335 |
|
336 |
if ((flags = fcntl(fd,F_GETFL,0)) < 1) |
337 |
return(-1); |
338 |
|
339 |
return(fcntl(fd,F_SETFL, flags | O_NONBLOCK)); |
340 |
} |