guestfs-inspect/guestfs-inspectd.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <czmq.h>
#include <zactor.h>
#include <guestfs.h>

#include "libguestfs-inspect.h"

#define STREQ(a, b) (strcmp((a), (b)) == 0)

static void *worker_task(zsock_t*, char*);

char *endpoint(void);

static int compare_key_len(const void*, const void*);
static int count_mountpoints(char *const *argv);

char *endpoint() {
  // TODO: This should be based on GUESTFS_INSPECT_ENDPOINT, or XDG_RUNTIME_DIR if the former is not set, and default to a sensible path if neither are set.
  const char* ep = "ipc:///tmp/guestfs-inspect.sock";
  char *res = malloc(strlen(ep) + 1);
  strcpy(res, ep);
  return res;
}

static int compare_key_len(const void *p1, const void *p2) {
  const char *key1 = *(char* const*) p1;
  const char *key2 = *(char* const*) p2;
  return strlen(key1) - strlen(key2);
}

static int count_mountpoints(char *const *argv) {
  size_t c;
  for (c = 0; argv[c]; c++) {}
  return c;
}

static void *worker_task(zsock_t *pipe, char *disk_path) {
  guestfs_h *g;
  char **roots, **mountpoints;
  char *root;
  size_t i, j;

  //char *file_content;
  //size_t file_size;

  // Create a connection handle
  g = guestfs_create();
  if (g == NULL) {
    exit(EXIT_FAILURE);
  }

  // Adding disk_path to connection handle
  if (guestfs_add_drive_opts(g, disk_path, GUESTFS_ADD_DRIVE_OPTS_READONLY, 1, -1) == -1) {
    exit(EXIT_FAILURE);
  }

  // Launching connection handle
  if (guestfs_launch(g) == -1) {
    exit(EXIT_FAILURE);
  }

  // Pulling rootfs information
  roots = guestfs_inspect_os(g);
  if (roots == NULL) {
    exit(EXIT_FAILURE);
  }

  // Looping through roots to mount mountpoints
  for (j = 0; roots[j] != NULL; j++) {
    root = roots[j];
    mountpoints = guestfs_inspect_get_mountpoints(g, root);
    if (mountpoints == NULL) {
      exit(EXIT_FAILURE);
    }
    // Sorting mountpoints to be in {'${device_path}', '${mount_path}'} format
    qsort(mountpoints, count_mountpoints(mountpoints) / 2, 2 * sizeof (char*), compare_key_len);
      for (i = 0; mountpoints[i] != NULL; i += 2) {
        guestfs_mount_ro(g, mountpoints[i+1], mountpoints[i]);
        free(mountpoints[i]);
        free(mountpoints[i+1]);
      }
      free(mountpoints);
      free(root);
  }

  // ZeroMQ Opens here
  zsock_signal(pipe, 0);
  while (true) {
    zmsg_t *message = zmsg_recv(pipe);
    if (message == NULL) {
      break;
    }
    // Process message

    // do something here

    // Sending reply
    zmsg_t *reply = zmsg_new();
    zmsg_addstr(reply, "Reply from worker");
    zmsg_send(&reply, pipe);
    zmsg_destroy(&message);
  }
  /*if (guestfs_is_file_opts(g, file_path, GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
      printf("--- %s ---\n", file_path);
      file_content = guestfs_read_file(g, file_path, &file_size);
      if (file_content == NULL) {
        exit(EXIT_FAILURE);
      }
      printf("%s\n", file_content);
      free(file_content);
    }*/
  free(roots);
  guestfs_close(g);
  exit(EXIT_SUCCESS);
}

int main(int argc, char **argv) {
  if (argc < 2) {
    printf("Usage: %s <disk-path> ...\n", argv[0]);
    return EXIT_FAILURE;
  }

  const int worker_count = argc - 1;

  // One worker per disk image.
  struct {
    char *name;
    zactor_t *worker;
  } worker_map[worker_count];

  for (int i = 0; i < worker_count; i++) {
    char *path = strtok(argv[i+1], ":");
    worker_map[i].name = strtok(NULL, ":");
    worker_map[i].worker = zactor_new(worker_task, path);
  }

  char *ep = endpoint();
  zsock_t *frontend = zsock_new_router(ep);
  free(ep);

  while (true) {
    zmsg_t *msg = zmsg_recv(frontend);

    if (!msg) break;

    // Find the worker with the given name.
    zactor_t *worker = NULL;
    for (int i = 0; i < worker_count; i++) {

    }
    if (worker) {
      zmsg_send(&msg, zactor_sock(worker));
    } else {
      // The name specified does not exist.
    }
  }
  return EXIT_SUCCESS;
}