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btmp.h
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btmp.h
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#ifndef _PATH_BTMP
# define _PATH_BTMP "/var/log/btmp"
#endif
/* 关于utmp的结构及各部分含义,详见/usr/include/bits/utmp.h */
/* 根据starttime和endtime,从btmp日志中提取相应时间段的数据,并
* 将二进制数据写入新生成的文件
*/
void generate_binlog(int32_t starttime, int32_t endtime)
{
FILE *fp_open_btmp, *fp_write_result;
struct utmp buffer;
fp_open_btmp = fopen( _PATH_BTMP, "r");
fp_write_result = fopen( "./binlog.txt" , "w");
while (fread(&buffer, sizeof(buffer), 1, fp_open_btmp))
{
if (buffer.ut_tv.tv_sec >= starttime && buffer.ut_tv.tv_sec <= endtime)
{
printf("%d %d %d %s %s\n", buffer.ut_tv.tv_sec, buffer.ut_type,
buffer.ut_addr_v6[4], buffer.ut_user, buffer.ut_host);
//大于starttime的条目以二进制形式写入文件
fwrite(&buffer, sizeof(buffer), 1, fp_write_result);
}
else
continue;
}
fclose(fp_open_btmp);
fclose(fp_write_result);
}
/* 根据starttime和endtime,从btmp日志中提取相应时间段的数据,并
* 将文本数据写入新生成的文件
*/
void generate_filelog(int32_t starttime, int32_t endtime)
{
FILE *fp_open_btmp, *fp_write_result;
struct utmp buffer;
fp_open_btmp = fopen( _PATH_BTMP, "r");
fp_write_result = fopen( "./filelog.txt" , "w");
while (fread(&buffer, sizeof(buffer), 1, fp_open_btmp))
{
if (buffer.ut_tv.tv_sec >= starttime && buffer.ut_tv.tv_sec <= endtime)
{
printf("%d %d %d %s %s\n", buffer.ut_tv.tv_sec, buffer.ut_type,
buffer.ut_addr_v6[4], buffer.ut_user, buffer.ut_host);
//大于starttime的条目以二进制形式写入文件
fprintf(fp_write_result, "%d %d %d %s %s\n", buffer.ut_tv.tv_sec, buffer.ut_type,
buffer.ut_addr_v6[4], buffer.ut_user, buffer.ut_host);
}
else
continue;
}
fclose(fp_open_btmp);
fclose(fp_write_result);
}