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dpavlin |
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/* |
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* Cisco C7200 (Predator) simulation platform. |
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* Copyright (c) 2005,2006 Christophe Fillot. All rights reserved. |
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* |
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* Utility functions. |
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*/ |
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#define _GNU_SOURCE |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <stdarg.h> |
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#include <unistd.h> |
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#include <time.h> |
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dpavlin |
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#include <signal.h> |
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dpavlin |
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#include <sys/time.h> |
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#include <sys/ioctl.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <arpa/inet.h> |
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#include <netdb.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <assert.h> |
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#ifdef __CYGWIN__ |
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#include <malloc.h> |
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#endif |
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#include "utils.h" |
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extern FILE *log_file; |
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/* Add an element to a list */ |
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m_list_t *m_list_add(m_list_t **head,void *data) |
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{ |
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m_list_t *item; |
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if ((item = malloc(sizeof(*item))) != NULL) { |
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item->data = data; |
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item->next = *head; |
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*head = item; |
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} |
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return item; |
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} |
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/* Dynamic sprintf */ |
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char *dyn_sprintf(const char *fmt,...) |
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{ |
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int n,size = 512; |
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va_list ap; |
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char *p,*p2; |
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if ((p = malloc(size)) == NULL) { |
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perror("dyn_sprintf: malloc"); |
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return NULL; |
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} |
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for(;;) |
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{ |
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/* Try to print in the allocated space */ |
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va_start(ap,fmt); |
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n = vsnprintf(p,size,fmt,ap); |
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va_end(ap); |
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/* If that worked, return the string */ |
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if ((n > -1) && (n < size)) |
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return p; |
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/* Else try again with more space. */ |
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if (n > -1) |
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size = n + 1; |
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else |
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size *= 2; |
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if ((p2 = realloc(p,size)) == NULL) { |
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perror("dyn_sprintf: realloc"); |
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free(p); |
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return NULL; |
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} |
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p = p2; |
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} |
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} |
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/* Split a string */ |
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int m_strsplit(char *str,char delim,char **array,int max_count) |
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{ |
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int i,pos = 0; |
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size_t len; |
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char *ptr; |
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for(i=0;i<max_count;i++) |
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array[i] = NULL; |
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do { |
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if (pos == max_count) |
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goto error; |
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ptr = strchr(str,delim); |
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if (!ptr) |
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ptr = str + strlen(str); |
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len = ptr - str; |
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if (!(array[pos] = malloc(len+1))) |
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goto error; |
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memcpy(array[pos],str,len); |
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array[pos][len] = 0; |
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str = ptr + 1; |
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pos++; |
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}while(*ptr); |
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return(pos); |
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error: |
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for(i=0;i<max_count;i++) |
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free(array[i]); |
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return(-1); |
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} |
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/* Tokenize a string */ |
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int m_strtok(char *str,char delim,char **array,int max_count) |
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{ |
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int i,pos = 0; |
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size_t len; |
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char *ptr; |
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for(i=0;i<max_count;i++) |
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array[i] = NULL; |
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do { |
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if (pos == max_count) |
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goto error; |
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ptr = strchr(str,delim); |
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if (!ptr) |
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ptr = str + strlen(str); |
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len = ptr - str; |
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if (!(array[pos] = malloc(len+1))) |
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goto error; |
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memcpy(array[pos],str,len); |
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array[pos][len] = 0; |
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while(*ptr == delim) |
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ptr++; |
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str = ptr; |
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pos++; |
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}while(*ptr); |
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return(pos); |
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error: |
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for(i=0;i<max_count;i++) |
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free(array[i]); |
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return(-1); |
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} |
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/* Quote a string */ |
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char *m_strquote(char *buffer,size_t buf_len,char *str) |
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{ |
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char *p; |
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if (!(p = strpbrk(str," \t\"'"))) |
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return str; |
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snprintf(buffer,buf_len,"\"%s\"",str); |
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return buffer; |
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} |
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/* Ugly function that dumps a structure in hexa and ascii. */ |
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void mem_dump(FILE *f_output,u_char *pkt,u_int len) |
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{ |
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u_int x,i = 0, tmp; |
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while (i < len) |
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{ |
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if ((len - i) > 16) |
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x = 16; |
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else x = len - i; |
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fprintf(f_output,"%4.4x: ",i); |
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for (tmp=0;tmp<x;tmp++) |
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fprintf(f_output,"%2.2x ",pkt[i+tmp]); |
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for (tmp=x;tmp<16;tmp++) fprintf(f_output," "); |
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for (tmp=0;tmp<x;tmp++) { |
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char c = pkt[i+tmp]; |
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if (((c >= 'A') && (c <= 'Z')) || |
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((c >= 'a') && (c <= 'z')) || |
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((c >= '0') && (c <= '9'))) |
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fprintf(f_output,"%c",c); |
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else |
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fputs(".",f_output); |
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} |
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i += x; |
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fprintf(f_output,"\n"); |
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} |
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fprintf(f_output,"\n"); |
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} |
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/* Logging function */ |
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void m_flog(FILE *fd,char *module,char *fmt,va_list ap) |
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{ |
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struct timeval now; |
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static char buf[256]; |
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time_t ct; |
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gettimeofday(&now,0); |
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ct = now.tv_sec; |
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strftime(buf,sizeof(buf),"%b %d %H:%M:%S",localtime(&ct)); |
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if (fd) { |
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fprintf(fd,"%s.%03ld %s: ",buf,(long)now.tv_usec/1000,module); |
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vfprintf(fd,fmt,ap); |
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fflush(fd); |
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} |
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} |
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/* Logging function */ |
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void m_log(char *module,char *fmt,...) |
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{ |
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va_list ap; |
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va_start(ap,fmt); |
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m_flog(log_file,module,fmt,ap); |
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va_end(ap); |
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} |
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/* Returns a line from specified file (remove trailing '\n') */ |
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char *m_fgets(char *buffer,int size,FILE *fd) |
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{ |
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int len; |
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buffer[0] = '\0'; |
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fgets(buffer,size,fd); |
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if ((len = strlen(buffer)) == 0) |
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return NULL; |
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/* remove trailing '\n' */ |
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if (buffer[len-1] == '\n') |
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buffer[len-1] = '\0'; |
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return buffer; |
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} |
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/* Read a file and returns it in a buffer */ |
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ssize_t m_read_file(char *filename,char **buffer) |
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{ |
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char tmp[256],*ptr,*nptr; |
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size_t len,tot_len; |
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FILE *fd; |
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*buffer = ptr = NULL; |
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tot_len = 0; |
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/* Open file for reading */ |
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if ((fd = fopen(filename,"r")) == NULL) |
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return(-1); |
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while((len = fread(tmp,1,sizeof(tmp),fd)) > 0) |
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{ |
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/* Reallocate memory */ |
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nptr = realloc(ptr,tot_len+len+1); |
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if (nptr == NULL) { |
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if (ptr) free(ptr); |
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fclose(fd); |
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return(-1); |
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} |
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ptr = nptr; |
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/* Ok, memory could be allocated */ |
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memcpy(&ptr[tot_len],tmp,len); |
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tot_len += len; |
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} |
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fclose(fd); |
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*buffer = ptr; |
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return(tot_len); |
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} |
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/* Allocate aligned memory */ |
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void *m_memalign(size_t boundary,size_t size) |
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{ |
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void *p; |
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#ifdef __linux__ |
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if (posix_memalign((void *)&p,boundary,size)) |
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#else |
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dpavlin |
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#if defined(__CYGWIN__) || defined(SUNOS) |
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dpavlin |
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if (!(p = memalign(boundary,size))) |
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#else |
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if (!(p = malloc(size))) |
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#endif |
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#endif |
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return NULL; |
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assert(((m_iptr_t)p & (boundary-1)) == 0); |
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return p; |
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} |
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dpavlin |
3 |
/* Block specified signal for calling thread */ |
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int m_signal_block(int sig) |
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{ |
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sigset_t sig_mask; |
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sigemptyset(&sig_mask); |
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sigaddset(&sig_mask,sig); |
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return(pthread_sigmask(SIG_BLOCK,&sig_mask,NULL)); |
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} |
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/* Unblock specified signal for calling thread */ |
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int m_signal_unblock(int sig) |
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{ |
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sigset_t sig_mask; |
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sigemptyset(&sig_mask); |
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sigaddset(&sig_mask,sig); |
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return(pthread_sigmask(SIG_UNBLOCK,&sig_mask,NULL)); |
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} |
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/* Set non-blocking mode on a file descriptor */ |
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int m_fd_set_non_block(int fd) |
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{ |
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int flags; |
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if ((flags = fcntl(fd,F_GETFL,0)) < 1) |
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return(-1); |
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return(fcntl(fd,F_SETFL, flags | O_NONBLOCK)); |
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} |