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/*
 * Alternate testbrowse utility provided by Mikhail Kshevetskiy.
 * This version tests use of multiple contexts.
 */

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include <libsmbclient.h>

int	debuglevel	= 0;
char	*workgroup	= "NT";
char	*username	= "guest";
char	*password	= "";

typedef struct smbitem smbitem;
typedef int(*qsort_cmp)(const void *, const void *);

struct smbitem{
    smbitem	*next;
    int		type;
    char	name[1];
};

int smbitem_cmp(smbitem *elem1, smbitem *elem2){
    return strcmp(elem1->name, elem2->name);
}

int smbitem_list_count(smbitem *list){
    int count = 0;
    
    while(list != NULL){
	list = list->next;
	count++;
    }
    return count;
}

void smbitem_list_delete(smbitem *list){
    smbitem	*elem;
    
    while(list != NULL){
	elem = list;
	list = list->next;
	free(elem);
    }
}

smbitem* smbitem_list_sort(smbitem *list){
    smbitem	*item, **array;
    int		count, i;

    if ((count = smbitem_list_count(list)) == 0) return NULL;
    if ((array = malloc(count * sizeof(smbitem*))) == NULL){
	smbitem_list_delete(list);
	return NULL;
    }
    
    for(i = 0; i < count; i++){
	array[i] = list;
	list = list->next;
    }	
    qsort(array, count, sizeof(smbitem*), (qsort_cmp)smbitem_cmp);
    
    for(i = 0; i < count - 1; i++) array[i]->next = array[i + 1];
    array[count - 1]->next = NULL;
    
    list = array[0];
    free(array);
    return list;
}

void smbc_auth_fn(
                const char      *server,
		const char      *share,
		char            *wrkgrp, int wrkgrplen,
		char            *user,   int userlen,
		char            *passwd, int passwdlen){
		
    (void) server;
    (void) share;
    (void) wrkgrp;
    (void) wrkgrplen;

    strncpy(wrkgrp, workgroup, wrkgrplen - 1); wrkgrp[wrkgrplen - 1] = 0;
    strncpy(user, username, userlen - 1); user[userlen - 1] = 0;
    strncpy(passwd, password, passwdlen - 1); passwd[passwdlen - 1] = 0;
}

SMBCCTX* create_smbctx(){
    SMBCCTX	*ctx;

    if ((ctx = smbc_new_context()) == NULL) return NULL;

    ctx->debug = debuglevel;
    ctx->callbacks.auth_fn = smbc_auth_fn;

    if (smbc_init_context(ctx) == NULL){
	smbc_free_context(ctx, 1);
	return NULL;
    }

    return ctx;
}

void delete_smbctx(SMBCCTX* ctx){
    ctx->callbacks.purge_cached_fn(ctx);
    smbc_free_context(ctx, 1);
}

smbitem* get_smbitem_list(SMBCCTX *ctx, char *smb_path){
    SMBCFILE		*fd;
    struct smbc_dirent	*dirent;
    smbitem		*list = NULL, *item;

    if ((fd = ctx->opendir(ctx, smb_path)) == NULL) return NULL;
    while((dirent = ctx->readdir(ctx, fd)) != NULL){
	if (strcmp(dirent->name, "") == 0) continue;
	if (strcmp(dirent->name, ".") == 0) continue;
	if (strcmp(dirent->name, "..") == 0) continue;
	
	if ((item = malloc(sizeof(smbitem) + strlen(dirent->name))) == NULL)
	    continue;
	
	item->next = list;
	item->type = dirent->smbc_type;
	strcpy(item->name, dirent->name);
	list = item;
    }
    ctx->close_fn(ctx, fd);
    return /* smbitem_list_sort */ (list);    
        
}

void print_smb_path(char *group, char *path){
    if ((strlen(group) == 0) && (strlen(path) == 0)) printf("/\n");
    else if (strlen(path) == 0) printf("/%s\n", group);
    else{
	if (strlen(group) == 0) group = "(unknown_group)";
	printf("/%s/%s\n", group, path);
    }
}

void recurse(SMBCCTX *ctx, char *smb_group, char *smb_path, int maxlen){
    int 	len;
    smbitem	*list, *item;
    SMBCCTX	*ctx1;
    
    len = strlen(smb_path);
    
    list = get_smbitem_list(ctx, smb_path);
    while(list != NULL){
	switch(list->type){
	    case SMBC_WORKGROUP:
	    case SMBC_SERVER:
		if (list->type == SMBC_WORKGROUP){
		    print_smb_path(list->name, "");
		    smb_group = list->name;
		}
		else print_smb_path(smb_group, list->name);
		
		if (maxlen < 7 + strlen(list->name)) break;
		strcpy(smb_path + 6, list->name);
		if ((ctx1 = create_smbctx()) != NULL){
		    recurse(ctx1, smb_group, smb_path, maxlen);
		    delete_smbctx(ctx1);
		}else{
		    recurse(ctx, smb_group, smb_path, maxlen);
		    ctx->callbacks.purge_cached_fn(ctx);
		}
		break;
	    case SMBC_FILE_SHARE:
	    case SMBC_DIR:
	    case SMBC_FILE:
		if (maxlen < len + strlen(list->name) + 2) break;
		
		smb_path[len] = '/';
		strcpy(smb_path + len + 1, list->name);
		print_smb_path(smb_group, smb_path + 6);
		if (list->type != SMBC_FILE){
		    recurse(ctx, smb_group, smb_path, maxlen);
		    if (list->type == SMBC_FILE_SHARE)
			ctx->callbacks.purge_cached_fn(ctx);
		}
		break;
	}
	item = list;
	list = list->next;
	free(item);
    }
    smb_path[len] = '\0';
}

int main(int argc, char *argv[]){
    int		i;
    SMBCCTX	*ctx;
    char	smb_path[32768] = "smb://";

    if ((ctx = create_smbctx()) == NULL){
	perror("Cant create samba context.");
	return 1;
    }

    if (argc == 1) recurse(ctx, "", smb_path, sizeof(smb_path));
    else for(i = 1; i < argc; i++){
	strncpy(smb_path + 6, argv[i], sizeof(smb_path) - 7);
	smb_path[sizeof(smb_path) - 1] = '\0';
	recurse(ctx, "", smb_path, sizeof(smb_path));
    }
    
    delete_smbctx(ctx);
    return 0;	
}