daemon/main.c

#include "main.h"
#include "conf.h"
#include "libconf.h"

conf *conf_head = NULL;

void print_conf(conf * p) {
    conf *temp = p;             //将temp指针重新指向头结点
    while (temp) {              //只要temp指针指向的结点的next不是Null就执行输出
        if (temp->PROCESS)
            printf("%s\n", temp->PROCESS);
        temp = temp->next;
    }
}

void free_conf(conf *p) {
    conf *temp = p;
    while (temp) {
        if (temp->PROCESS)
            free(temp->PROCESS);
        temp = temp->next;
    }
}

int get_process_pid(char *proces_name) {
    char bufer[PATH_SIZE];
    char comm[PATH_SIZE];
    char proc_comm_name[PATH_SIZE];
    int num[PATH_SIZE] = { 0 };
    int n = 0;
    FILE *fp;
    DIR *dir;
    struct dirent *ptr;
    dir = opendir("/proc");
    while ((ptr = readdir(dir)) != NULL) {
        if (ptr->d_type == 4 && strcasecmp(ptr->d_name, ".") && strcasecmp(ptr->d_name, "..")) {
            bzero(bufer, 0);
            sprintf(comm, "/proc/%s/comm", ptr->d_name);
            if (access(comm, F_OK) == 0) {
                fp = fopen(comm, "r");
                if (fgets(bufer, PATH_SIZE - 1, fp) == NULL) {
                    fclose(fp);
                    continue;
                }
                sscanf(bufer, "%s", proc_comm_name);
                if (!strcmp(proces_name, proc_comm_name)) {
                    num[n] = atoi(ptr->d_name);
                    n += 1;
                }
                fclose(fp);
            }
        }

    }

    n -= 1;                     // 去除最后一个搜索时的本身进程
    closedir(dir);
    if (num[0] > 0)
        return num[0];
    else
        return 0;
}

char *times() {
    time_t t;
    struct tm *timeinfo;
    
    time(&t);
    timeinfo = localtime(&t);
    return asctime(timeinfo);
}

int logs(char *str, char *configfile) {
    FILE *fp = NULL;
    
    fp = fopen(read_conf(configfile, "global", "LOGFILE"), "a+");
    fprintf(fp, str);
    return fclose(fp);
}

int8_t copy_new_mem(char *src, int src_len, char **dest) {
    *dest = (char *)malloc(src_len + 1);
    if (*dest == NULL)
        return 1;
    memcpy(*dest, src, src_len);
    *((*dest)+src_len) = '\0';

    return 0;
}

int loop(char *configfile, conf *p)
{
    conf *conf = p; 

    FILE *fp;
    char buffer[CACHE_SIZE];
    char *key;              //键
    char *val;              //值
    char log_content[CACHE_SIZE];
    memset(log_content, 0, CACHE_SIZE);
    while (1) {
        while (conf) {
            if (conf->PROCESS) {
                val = strstr(conf->PROCESS, "->");
                copy_new_mem(conf->PROCESS, val - conf->PROCESS, &key);

                if (get_process_pid(key) <= 0) {
                    strcpy(log_content, times());
                    strcat(log_content, key);
                    strcat(log_content, " Not running\n");
                    logs(log_content, configfile);
                    
                    fp = _popen(val+2, "r");
                    val = NULL;
                    memset(buffer, 0, CACHE_SIZE);
                    while (fgets(buffer, sizeof(buffer), fp)) {
                        //printf("%s", buffer);
                        logs(buffer, configfile);
                    }
                    _pclose(fp);
                } else {
                    strcpy(log_content, times());
                    strcat(log_content, key);
                    strcat(log_content, " Running\n");
                    logs(log_content, configfile);
                }
                
                free(key);
            }
            conf = conf->next;
        }
        conf = p;
        sleep(atoi(read_conf(configfile, "global", "TIME")));
    }
    
    return 0;
}

int main(int argc, char *argv[], char **env) {
    char configfile[PATH_SIZE];
    int opt;
    
    memset(configfile, 0, PATH_SIZE);
    while ((opt = getopt(argc, argv, "c:h?")) != -1) {
        switch (opt) {
            case 'c':
                strcpy(configfile, optarg);
                break;
            case 'h':
            case '?':
                printf("%s\n",
                "Process daemon\n"\
                "Author: AIXIAO@AIXIAO.ME\n"\
                "Usage: [-?h] [-c filename]\n"\
                "\n"\
                "Options:\n"\
                    "-c          : set configuration file, (default: daemon.conf)\n"\
                    "-? -h       : help information\n");
                exit(1);
                break;
            default:
                break;
        }
    }
    
    if (strlen(configfile) == 0) {
        strcpy(configfile, "daemon.conf");
    }

    if (daemon(1, 1)) {     // 守护, 脱离终端
        perror("daemon");
    }
    
    read_conf_link(configfile);    
    loop(configfile, conf_head);
    free_conf(conf_head);
    
    return 0;
}