claugeas/main.cpp

#include <iostream>
#include <exception>
#include <augeas.h>
#include <stdio.h>
#include <vector>
#include <map>
// This file is currently for testing and training using augeas with C++
// https://github.com/hercules-team/augeas/blob/master/tests/test-api.c

static const char *abs_top_srcdir;
static const char *root = "../root";
static const char *loadpath = "/opt/homebrew/share/augeas/lenses/dist";


static void testGet() {
    int r;
    const char *value;
    const char *label;
    struct augeas *aug;
    char *s;

    aug = aug_init(root, loadpath, AUG_NO_STDINC | AUG_NO_LOAD);

    r = aug_load_file(aug, "/etc/hosts");
    r = aug_source(aug, "/files/etc/hosts/1", &s);

    std::cout << "The value read from node: " << s << std::endl;

    aug_close(aug);
}

static void readHostsFile() {
    struct augeas *aug;
    int r;
    char *s;
    char *etc_hosts_fn = NULL;
    FILE *hosts_fp = NULL;
    char *hosts_txt = NULL;

    aug = aug_init(root, loadpath, AUG_NO_STDINC | AUG_NO_LOAD);

    r = aug_load_file(aug, "/etc/hosts");
    r = aug_preview(aug, "/files/etc/hosts/1", &s);

    std::cout << s << std::endl;

    free(hosts_txt);
    free(s);
    aug_close(aug);
}

static void printHostsText() {
    struct augeas *aug;
    int r;
    char *s;
    char *etc_hosts_fn = NULL;

    aug = aug_init(root, loadpath, AUG_NO_STDINC | AUG_NO_LOAD);

    r = aug_load_file(aug, "/etc/hosts");
    r = aug_preview(aug, "/files/etc/hosts/1", &s);
    std::cout << s << std::endl;

    free(s);
    aug_close(aug);
}


/// Get the tree of the /etc/hosts file printed in the console
/// Implementation based on https://github.com/Nexenta/node-augeas/blob/756276c432cc9e506836800ac9d217bedbbef55c/libaugeas.cc#L784

static void readHostsTree() {
    struct augeas *aug;
    int r;
    FILE *out = tmpfile();
    char *etc_hosts_fn = NULL;

    aug = aug_init(root, loadpath, AUG_NO_STDINC | AUG_NO_LOAD);

    const std::string matchPath = "/files/etc/hosts/*";

    r = aug_load_file(aug, "/etc/hosts");
    r = aug_print(aug, out,"/files/etc/hosts/*");

    std::map <std::string, std::string> stdBindList;
    std::map <std::string , std::string>::iterator pos;

    char line[256];
    rewind(out);
    while (fgets(line, 256, out) != NULL) {
        // remove end of line
        line[strlen(line) - 1] = '\0';
        std::string s = line;
        ;
        // skip comments
        if (s.find("#comment") != std::string::npos)
            continue;
        s = s.substr(matchPath.length() - 1);
        // split by '=' sign
        size_t eqpos = s.find(" = ");
        if (eqpos == std::string::npos)
            continue;
        // extract key and value
        std::string key = s.substr(0, eqpos);
        std::string value = s.substr(eqpos + 3);
        // remove '"' sign from around value
        value.erase(value.begin());
        value.erase(value.end() - 1);
        stdBindList.insert(std::pair<std::string,std::string>(key,value)); // 2

    }


    fclose(out);

    for (pos = stdBindList.begin();pos!=stdBindList.end();pos++)
    {
        std::cout << "Key: " << pos->first << ";" << " Value: " << pos->second << std::endl;
    }

    aug_close(aug);



}


int main(int argc, char *argv[]) {

    testGet();
    readHostsTree();
    return 0;
}