basic C program to interact with API for listing VMs
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#include <libvirt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void pr_bad();
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void pr_conn_bad();
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void pr_conn_good();
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void pr_fatal_and_exit(int e);
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void pr_good();
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void pr_no_match();
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int get_domain(char *uuid, virDomainPtr *domain);
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char * get_state_string(virDomainPtr dom, int state);
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void lv_get_name(char *uuid);
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void lv_get_state(char *uuid);
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void lv_get_xml(char *uuid);
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void lv_list_all_name();
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void lv_list_all_uuid();
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const int E_LIBVIRT=16;
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virConnectPtr conn;
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/*One of these is displayed on startup. If CONN_BAD, program exits*/
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const char CONN_BAD[]= "# No Connection";
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const char CONN_GOOD[]="# Connected";
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/*After a command is issued, one of these displays. Only GOOD is followed
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by the requested information */
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const char BAD_REQ[]="# Bad Request";
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const char FATAL[]= "# Fatal error";
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const char GOOD[]= "# Making API Request";
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const char NOMATCH[]="# No matching domain";
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/************************************************************************/
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/* Possible commands:
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* list: list UUIDs of all domains that are defined and/or running
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* list_name: list names of all domains that are defined and/or running
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* get_name <uuid>: get name of domain
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* get_state <uuid>: get state of domain as defined in man qq2clone. It
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* is possible, though unlikely for this to return an empty string
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* even when referring to a valid uuid
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* get_xml <uuid>: print xml file describing domain (prints current
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* config of a running machine, rather than inactive config)
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*/
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int main () {
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/* Connect to libvirt API */
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conn=virConnectOpen(NULL);
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int loop=1;
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if ( conn == NULL) {
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pr_conn_bad();
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exit(E_LIBVIRT);
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} else {
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pr_conn_good();
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}
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char *lineptr, *token, **str_arr;
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const char delim[]="\t\n ";
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unsigned int count;
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int i;
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size_t n;
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/* Get input from stdin and execute commands in a loop */
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while(1) {
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str_arr=NULL;
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lineptr=NULL; n=0; count=0;
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getline(&lineptr,&n,stdin);
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token=strtok(lineptr,delim);
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if (token == NULL) { free(lineptr); pr_bad(); continue; }
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while (token != NULL) {
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str_arr=realloc(str_arr, sizeof(char*) * (count + 1) );
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if (str_arr == NULL){ pr_fatal_and_exit(1); }
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str_arr[count]=token;
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count++;
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token=strtok(NULL,delim);
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}
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if ( count > 2 || count == 0) { free(lineptr); pr_bad(); continue; }
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if ( strcmp( str_arr[0], "exit" ) == 0 ) {
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virConnectClose(conn); exit(0);
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} else if (strcmp( str_arr[0], "list" ) == 0 ) {
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if (count==1){ lv_list_all_uuid(); } else { pr_bad(); }
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} else if (strcmp( str_arr[0], "list_name" ) == 0 ) {
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if (count==1){ lv_list_all_name(); } else { pr_bad(); }
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} else if (strcmp( str_arr[0], "get_name" ) == 0 ) {
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if (count==2){ lv_get_name(str_arr[1]); } else { pr_bad(); }
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} else if (strcmp( str_arr[0], "get_state" ) == 0 ) {
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if (count==2){ lv_get_state(str_arr[1]); } else { pr_bad(); }
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} else if (strcmp( str_arr[0], "get_xml" ) == 0 ) {
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if (count==2){ lv_get_xml(str_arr[1]); } else { pr_bad(); }
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} else {
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pr_bad();
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}
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free(lineptr);
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if (str_arr != NULL){ free(str_arr); }
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}
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exit(0);
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}
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/************************************************************************/
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/***********************************
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* Basic, repeated output sequences *
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***********************************/
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void pr_bad() {
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printf("+%s\n",BAD_REQ);
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}
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void pr_conn_bad() {
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printf("+%s\n", CONN_BAD);
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}
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void pr_conn_good() {
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printf("+%s\n",CONN_GOOD);
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}
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/* Okay, this one provides a basic output sequence *and* quits */
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void pr_fatal_and_exit(int e) {
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printf("+%s\n",FATAL);
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virConnectClose;
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exit(e);
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}
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void pr_good() {
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printf("+%s\n",GOOD);
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}
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void pr_no_match() {
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printf("+%s\n",NOMATCH);
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}
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/*****************************************
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* Helper functions for working with API *
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*****************************************/
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int get_domain(char *uuid, virDomainPtr *domain){
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*domain=virDomainLookupByUUIDString(conn, (const char *) uuid);
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if (domain == NULL){
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return 1;
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}
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return 0;
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}
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char * get_state_string(virDomainPtr dom, int state)
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{
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if (state == VIR_DOMAIN_RUNNING) {
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return ("running");
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} else if (state == VIR_DOMAIN_BLOCKED) {
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return ("idle");
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} else if ( state == VIR_DOMAIN_PAUSED ) {
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return ("paused");
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} else if ( state == VIR_DOMAIN_SHUTDOWN ) {
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return("shutting-down");
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} else if ( state == VIR_DOMAIN_SHUTOFF ) {
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int saved;
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saved=virDomainHasManagedSaveImage(dom,0);
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if( saved == 1 ) {
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return("saved");
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} else if ( saved == 0 ) {
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return("off");
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} else {
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return(NULL);
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}
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} else if ( state == VIR_DOMAIN_CRASHED ) {
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return("crashed");
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} else if ( state == VIR_DOMAIN_PMSUSPENDED ) {
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return ("pmsuspended");
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} else {
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return("");
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}
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}
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/*******************************************************
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* Get information from libvirt API and print to stdout *
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*******************************************************/
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void lv_get_name (char *uuid){
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virDomainPtr domain;
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if (get_domain(uuid, &domain) == 0){
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pr_good();
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const char *name;
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name=virDomainGetName(domain);
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if (name!=NULL){ printf("+%s\n",name); }
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else { pr_fatal_and_exit(E_LIBVIRT); }
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virDomainFree(domain);
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}else{
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pr_no_match();
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}
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}
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void lv_get_state(char *uuid){
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virDomainPtr domain;
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if (get_domain(uuid, &domain) == 0){
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pr_good();
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int *state=malloc(sizeof(state)), *reason=malloc(sizeof(reason)), ret;
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ret=virDomainGetState(domain,state,reason,0);
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if ( ret==0 ){
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const char *state_str;
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state_str=get_state_string(domain, *state);
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printf("+%s\n",state_str);
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} else { printf("+\n"); }
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virDomainFree(domain);
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free(state);
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free(reason);
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}else{
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pr_no_match();
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}
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}
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void lv_get_xml(char *uuid){
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virDomainPtr domain;
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if (get_domain(uuid, &domain) == 0){
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pr_good();
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char *xml;
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xml=virDomainGetXMLDesc(domain, 0);
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if ( xml!=NULL ){
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char *token;
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token=strtok(xml, "\n");
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if(token==NULL) { free(xml); virDomainFree(domain); return; }
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while (token != NULL) {
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printf ("+%s\n",token);
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token=strtok(NULL, "\n");
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}
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free(xml);
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}
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else { pr_fatal_and_exit(E_LIBVIRT); }
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virDomainFree(domain);
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}else{
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pr_no_match();
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}
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}
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void lv_list_all_uuid() {
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virDomainPtr *domains;
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int ret_list, ret_uuid, i;
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ret_list=virConnectListAllDomains(conn,&domains,0);
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if(ret_list<0){ virConnectClose(conn);
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pr_fatal_and_exit(E_LIBVIRT); };
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pr_good();
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char *uuid=malloc(VIR_UUID_STRING_BUFLEN);
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for(i=0;i<ret_list;i++){
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ret_uuid=virDomainGetUUIDString(domains[i],uuid);
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if (ret_uuid==0) {
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printf("+%s\n",uuid);
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virDomainFree(domains[i]);
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}
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}
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free(uuid);
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free(domains);
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}
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void lv_list_all_name() {
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virDomainPtr *domains;
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int ret_list, i;
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ret_list=virConnectListAllDomains(conn,&domains,0);
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if(ret_list<0){ virConnectClose(conn); pr_fatal_and_exit(E_LIBVIRT); };
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pr_good();
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const char *name;
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for(i=0;i<ret_list;i++){
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name=virDomainGetName(domains[i]);
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if (name!=NULL){ printf("+%s\n",name); }
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else { pr_fatal_and_exit(E_LIBVIRT); }
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virDomainFree(domains[i]);
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}
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free(domains);
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}
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