本文共 7624 字，大约阅读时间需要 25 分钟。
在linux shell 中可以用命令来看tty信息
tty 看当前tty名称 who 看所有登陆用户的信息。 结合这2个命令，可以分析出当前tty登陆的信息(tty_name, user_name, long_time, client ip). 将tty和who重定向到文件中，用程序模拟分析，得到了当前tty登陆的信息。[root@localhost src]# ./testinfo->tty_name = pts/3info->user_name = rootinfo->login_time = 2018-06-15 20:49info->ip = 192.168.154.1
// @file main.cpp#include#include #include #include #include #include #include #include #include #include "my_syslog.h"#include "time_convert.h"#ifndef SAFE_DELETE#define SAFE_DELETE(p) \ if (NULL != (p)) { \ delete (p); \ (p) = NULL; \ }#endif // #ifndef SAFE_DELETEvoid init(const char* psz_log_owner_name);void uninit();void proc_sig_term(int num);int fn_test();int main(int argc, char** argv){ char sz_buf[1024] = {'\0'}; #ifdef MAKE_FILE_MACRO__BIN_NAME sprintf(sz_buf, "%s", MAKE_FILE_MACRO__BIN_NAME); init(sz_buf); MYLOG_D("MAKE_FILE_MACRO__BIN_NAME = [%s]", MAKE_FILE_MACRO__BIN_NAME);#else init(NULL);#endif // #ifdef MAKE_FILE_MACRO__BIN_NAME fn_test(); uninit(); MYLOG_D("THE END"); return EXIT_SUCCESS;}void init(const char* psz_log_owner_name){ int i = 0; // daemon(0, 0); ns_syslog::open_syslog((NULL != psz_log_owner_name) ? psz_log_owner_name : "ns_syslog"); // 设置控制变量中的日志条件, 实际应用中, 是从配置文件读取的控制开关 ns_syslog::g_log_condition.b_EMERG = false; ns_syslog::g_log_condition.b_CRIT = true; ns_syslog::g_log_condition.b_ALERT = true; ns_syslog::g_log_condition.b_ERR = true; ns_syslog::g_log_condition.b_WARNING = true; ns_syslog::g_log_condition.b_NOTICE = true; ns_syslog::g_log_condition.b_INFO = true; ns_syslog::g_log_condition.b_DEBUG = true; // 根据控制变量, 设置日志的mask // 在实际应用中, 这里可以是动态设置, e.g. 配置文件检测线程发现配置变了, 需要变更某些级别的日志记录结果 ns_syslog::set_log_level( ns_syslog::g_log_condition.b_EMERG, ns_syslog::g_log_condition.b_ALERT, ns_syslog::g_log_condition.b_CRIT, ns_syslog::g_log_condition.b_ERR, ns_syslog::g_log_condition.b_WARNING, ns_syslog::g_log_condition.b_NOTICE, ns_syslog::g_log_condition.b_INFO, ns_syslog::g_log_condition.b_DEBUG); // clear screen (print 25 empty line) for (i = 0; i < 25; i++) { MYLOG_D(""); } signal(SIGTERM, proc_sig_term);}void uninit(){ ns_syslog::close_syslog();}void proc_sig_term(int num){ MYLOG_D("SIGTERM = %d, num = %d", SIGTERM, num); MYLOG_D("maybe can do some clean task before quit"); exit(1); }bool fn_get_tmp_flie_path_name(char* buf, int buf_len) { bool rc = false; char sz_tmp_file_name[PATH_MAX] = {'\0'}; char* psz_tmp_file_name = NULL; int len_tmp_file_name = 0; do { if ((NULL == buf) || (buf_len <= 0)) { break; } memset(buf, 0, buf_len); strcpy(sz_tmp_file_name, "/tmp/my_tmp_XXXXXX"); // the post fix "XX" must 6X, e.g. "XXXXXX" psz_tmp_file_name = mktemp(sz_tmp_file_name); if (NULL == psz_tmp_file_name) { break; } len_tmp_file_name = strlen(sz_tmp_file_name); if (len_tmp_file_name > (buf_len - 1)) { break; } strcpy(buf, sz_tmp_file_name); rc = true; } while (0); return rc;}bool fn_parse_cmd_result_file_tty(const char* cmd_result_name, char* ttyname, int len_ttyname){ bool rc = false; char sz_buf[4096] = {'\0'}; int len_read_back = 0; FILE* fp = NULL; do { if (NULL == ttyname) { break; } // get result from temp file fp = fopen(cmd_result_name, "r"); if (NULL == fp) { break; } memset(sz_buf, 0, sizeof(sz_buf)); if (NULL != fgets(sz_buf, sizeof(sz_buf), fp)) { len_read_back = strlen(sz_buf); if (len_read_back <= 0) { break; } if (('\r' == sz_buf[len_read_back - 1]) || ('\n' == sz_buf[len_read_back - 1])) { sz_buf[len_read_back - 1] = '\0'; } } if ((len_ttyname - 1) < len_read_back) { break; } strcpy(ttyname, sz_buf); rc = true; } while (0); if (NULL != fp) { fclose(fp); fp = NULL; } return rc;}typedef struct _tag_who_info { char user_name[64]; char tty_name[64]; char login_time[64]; char ip[64];}TAG_WHO_INFO;bool fn_parse_cmd_result_file_who(const char* cmd_result_name, const char* tty_name, int len_ttyname, TAG_WHO_INFO* /*OUT*/ info){ bool rc = false; char sz_buf[4096] = {'\0'}; int len_read_back = 0; char* p = NULL; char* buffer = NULL; const char* delims = " "; int pos = 0; int len = 0; FILE* fp = NULL; bool first = true; bool find_tty_info = false; do { if ((NULL == cmd_result_name) || (NULL == tty_name) || (NULL == info)) { break; } memset(info, 0, sizeof(TAG_WHO_INFO)); // get result from temp file fp = fopen(cmd_result_name, "r"); if (NULL == fp) { break; } memset(sz_buf, 0, sizeof(sz_buf)); while (NULL != fgets(sz_buf, sizeof(sz_buf), fp)) { len_read_back = strlen(sz_buf); if (len_read_back <= 0) { continue; } if (('\r' == sz_buf[len_read_back - 1]) || ('\n' == sz_buf[len_read_back - 1])) { sz_buf[len_read_back - 1] = '\0'; } /* [root@localhost src]# who root tty1 2018-06-15 20:06 root pts/0 2018-06-15 20:09 (192.168.154.1) root pts/1 2018-06-15 20:35 (192.168.154.1) root pts/2 2018-06-15 20:40 (192.168.154.1) root pts/3 2018-06-15 20:49 (192.168.154.1) root pts/4 2018-06-15 21:13 (192.168.154.1) */ first = true; pos = 0; buffer = strdup(sz_buf); if (NULL != buffer) { do { if (first) { p = strtok(buffer, delims); first = false; } else { p = strtok(NULL, delims); } if (NULL == p) { break; } switch (pos) { case 0: strcpy(info->user_name, p); break; case 1: strcpy(info->tty_name, p); break; case 2: strcpy(info->login_time, p); strcat(info->login_time, " "); break; case 3: strcat(info->login_time, p); break; case 4: len = strlen(p); if (len > 0) { if (p[0] == '(') { len = strlen(p); strncpy(info->ip, p + 1, len - 2); } else { strcpy(info->ip, p); } } else { strcpy(info->ip, "127.0.0.1"); } break; default: break; } pos++; if (pos > 4) { break; } } while (1); free(buffer); buffer = NULL; } if (0 == strcmp(info->tty_name, tty_name)) { find_tty_info = true; break; // find tty_name info } else { memset(info, 0, sizeof(TAG_WHO_INFO)); } } rc = find_tty_info; } while (0); if (NULL != fp) { fclose(fp); fp = NULL; } return rc;}void fn_show_TAG_WHO_INFO(TAG_WHO_INFO* info){ do { if (NULL == info) { break; } printf("info->tty_name = %s\n", info->tty_name); printf("info->user_name = %s\n", info->user_name); printf("info->login_time = %s\n", info->login_time); printf("info->ip = %s\n", info->ip); } while (0);}void fn_get_current_tty_info() { char sz_buf[1024]; char sz_tmp_file_name[PATH_MAX]; char sz_tty_name[64]; char sz_tty_name_for_who[64]; char * pfind = NULL; TAG_WHO_INFO cur_tty_info; do { memset(sz_buf, 0, sizeof(sz_buf)); memset(sz_tmp_file_name, 0, sizeof(sz_tmp_file_name)); // get temp file name if (!fn_get_tmp_flie_path_name(sz_tmp_file_name, (int)sizeof(sz_tmp_file_name))) { break; } // exec 'tty' to temp file sprintf(sz_buf, "tty > %s%c", sz_tmp_file_name, '\0'); system(sz_buf); if (!fn_parse_cmd_result_file_tty(sz_tmp_file_name, sz_tty_name, sizeof(sz_tty_name))) { break; } // delete temp file sprintf(sz_buf, "rm -f %s%c", sz_tmp_file_name, '\0'); system(sz_buf); // printf("current tty name is [%s]\n", sz_tty_name); // current tty name is [/dev/pts/1] // printf( "Controlling terminal is %s\n", ctermid( NULL ) ); // Controlling terminal is /dev/tty // get tty name for cmd 'who' pfind = strstr(sz_tty_name, "/dev/"); if (NULL == pfind) { strcpy(sz_tty_name_for_who, sz_tty_name); } else { strcpy(sz_tty_name_for_who, sz_tty_name + strlen("/dev/")); } // exec 'who' to temp file sprintf(sz_buf, "who > %s%c", sz_tmp_file_name, '\0'); system(sz_buf); // sz_tty_name_for_who is [pts/1] // printf("sz_tty_name_for_who is [%s]\n", sz_tty_name_for_who); if (!fn_parse_cmd_result_file_who(sz_tmp_file_name, sz_tty_name_for_who, strlen(sz_tty_name_for_who), &cur_tty_info)) { break; } fn_show_TAG_WHO_INFO(&cur_tty_info); } while (0);}int fn_test(){ MYLOG_D(">> fn_test()"); fn_get_current_tty_info(); return 0;}
转载地址：http://gbmvf.baihongyu.com/