dav/main.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2012 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <libxml/xmlerror.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ucx/string.h>

#include "webdav.h"
#include "utils.h"
#include "config.h"
#include "crypto.h"
#include "main.h"

static DavContext *ctx;

void xmlerrorfnc(void * c, const char * msg, ... ) {
    // nothing
}

int main(int argc, char **argv) {
    xmlGenericErrorFunc fnc = xmlerrorfnc;
    initGenericErrorDefaultFunc(&fnc);
    load_config();
    ctx = dav_context_new();
    dav_add_namespace(ctx, "U", "http://www.uap-core.de/");
    
    if(argc < 2) {
        fprintf(stderr, "Missing command\n");
        print_usage(argv[0]);
        return -1;
    }
    
    char *cmd = argv[1];
    CmdArgs *args = cmd_parse_args(argc - 2, argv + 2);
    if(!args) {
        print_usage(argv[0]);
        return -1;
    }
    
    if(!strcmp(cmd, "list") || !strcmp(cmd, "ls")) {
        return cmd_list(args);
    } else if(!strcmp(cmd, "get")) {
        return cmd_get(args);
    } else if(!strcmp(cmd, "put")) {
        return cmd_put(args);
    }
    
    print_usage(argv[0]);
    return -1;
}

void print_usage(char *cmd) {
    fprintf(stderr, "Usage: %s command [options] arguments...\n\n", cmd);
    fprintf(stderr, "Commands:\n");
    fprintf(stderr, "        list [-al] <url>\n");
    fprintf(stderr, "        get [-p] [-k <key>] [-o <file>] <url>\n");
    fprintf(stderr, "        put [-p] [-k <key>] <url> <file>\n");
    fprintf(stderr, "\n");
    fprintf(stderr, "Options:\n");
    fprintf(stderr,
            "        -k <key>   Key to use for encryption or decryption\n");
    fprintf(stderr, "        -p         Don't encrypt or decrypt files\n");
    fprintf(stderr, "        -o <file>  Write output to file\n");
    fprintf(stderr, "\n");
    fprintf(stderr,
            "Instead of an url you can pass a repository name "
            "with an optional path:\n");
    fprintf(stderr, "        <repository>/path/\n");
    fprintf(stderr, "\n");
}

void url_get_parts(char *url, char **root, char **path) {
    size_t ulen = strlen(url);
    *root = NULL;
    *path = NULL;
    
    int s;
    if(ulen > 7 && !strncasecmp(url, "http://", 7)) {
        s = 7;
    } else if(ulen > 8 && !strncasecmp(url, "https://", 8)) {
        s = 8;
    } else {
        s = 1;
    }
    
    for(int i=s;i<ulen;i++) {
        char c = url[i];
        if(c == '/') {
            sstr_t r = sstrn(url, i);
            sstr_t p = sstrsubs(sstr(url), i);
            if(p.length == 0) {
                p = sstrn("/", 1);
            }
            *root = sstrdup(r).ptr;
            *path = sstrdup(p).ptr;
            return;
        }
    }
    
    *root = strdup(url);
    *path = strdup("/");
}

void print_resource_error(DavSession *sn, DavResource *res) {
    char *res_url = util_concat_path(sn->base_url, res->path);
    switch(sn->error) {
        default: {
            fprintf(stderr, "Cannot get resource %s.\n", res_url);
            break;
        }
        case DAV_NOT_FOUND: {
            fprintf(stderr, "Resource %s not found.\n", res_url);
            break;
        }
        case DAV_UNAUTHORIZED: {
            fprintf(stderr, "Authentication required.\n");
            break;
        }
        case DAV_FORBIDDEN: {
            fprintf(stderr, "Access forbidden.\n");
            break;
        }
    }
    free(res_url);
}


int cmd_list(CmdArgs *a) {
    if(a->argc == 0) {
        return -1;
    }
    
    DavSession *sn = NULL;
    char *url = a->argv[0];
    char *root = NULL;
    char *path = NULL;
    url_get_parts(url, &root, &path);
    
    Repository *repo = get_repository(root);
    if(repo) {
        sn = dav_session_new_auth(ctx, repo->url, repo->user, repo->password);
    } else {
        sn = dav_session_new(ctx, root);
    }
    
    //printf("baseurl: %s\n", sn->base_url);
    
    DavResource *ls = dav_get(sn, path, NULL);
    if(!ls) {
        print_resource_error(sn, ls);
        return -1;
    }
    DavResource *child = ls->children;
    while(child) {
        printf("%s\n", child->name);
        child = child->next;
    }
    
    return 0;
}

int cmd_get(CmdArgs *a) {
    if(a->argc == 0) {
        return -1;
    }
    
    DavSession *sn = NULL;
    char *url = a->argv[0];
    char *root = NULL;
    char *path = NULL;
    url_get_parts(url, &root, &path);
    
    Repository *repo = get_repository(root);
    if(repo) {
        sn = dav_session_new_auth(ctx, repo->url, repo->user, repo->password);
    } else {
        sn = dav_session_new(ctx, root);
    }
    
    DavResource *res = dav_get(sn, path, "U:crypto-key");
    if(!res) {
        print_resource_error(sn, res);
        return -1;
    }
    
    /*
     * determine the output file
     * use stdout if the output file is -
     */
    char *outfile = cmd_getoption(a, "output");
    if(!outfile) {
        outfile = res->name;
    }
    FILE *out = !strcmp(outfile, "-") ? stdout : fopen(outfile, "w");
    if(!out) {
        fprintf(stderr, "cannot open output file\n");
        return -1;
    }
    
    
    /*
     * if the -p (plain) option is specified we don't decrypt files
     * use a key specified with the -k (key) option, a key from the
     * key property or the repository default key
     */
    void *out_stream = out;
    dav_write_func write_func = (dav_write_func)fwrite;
    AESDecrypter *dec = NULL;
    char *plain = cmd_getoption(a, "plain");
    char *keyname = cmd_getoption(a, "key");
    if(!plain) {
        char *keyprop = dav_get_property_ns(
                res,
                "http://www.uap-core.de/",
                "crypto-key");
        Key *key = NULL;
        char *kn = NULL;
        if(keyname) {
            kn = keyname;
        } else if(keyprop) {
            kn = keyprop;
        } else if(repo && repo->decrypt) {
            kn = repo->default_key;
        }
        if(kn) {
            key = get_key(kn);
            if(!key) {
                fprintf(stderr, "Key %s not found!\nAbort.\n", kn);
                // TODO: free
                return -1;
            }
        }
        
        if(key) {
            dec = aes_decrypter_new(key, out, (dav_write_func)fwrite);
            out_stream = dec;
            write_func = (dav_write_func)aes_write;
        }
    }
    
    int ret = dav_get_content(res, out_stream, write_func);
    if(dec) {
        aes_decrypter_close(dec);
    }
    fclose(out);
    if(ret && strcmp(outfile, "-")) {
        unlink(outfile);
    }
    
    return 0;
}

int cmd_put(CmdArgs *a) {
    if(a->argc < 2) {
        return -1;
    }
    
    DavSession *sn = NULL;
    char *url = a->argv[0];
    char *file = a->argv[1];
    char *root = NULL;
    char *path = NULL;
    url_get_parts(url, &root, &path);
    
    Repository *repo = get_repository(root);
    if(repo) {
        sn = dav_session_new_auth(ctx, repo->url, repo->user, repo->password);
    } else {
        sn = dav_session_new(ctx, root);
    }
    
    /*
     * use stdin if the input file is -
     */
    FILE *in = !strcmp(file, "-") ? in : fopen(file, "r");
    if(!in) {
        fprintf(stderr, "cannot open input file\n");
        return -1;
    }
    
    DavResource *res = dav_resource_new(sn, path);
    if(!res) {
        fprintf(stderr, "error\n");
        return -1;
    }
    
    AESEncrypter *enc = NULL;
    char *keyname = cmd_getoption(a, "key");
    char *kn = NULL;
    char *plain = cmd_getoption(a, "plain");
    if(!plain && (keyname || repo)) {
        kn = keyname ? keyname : repo->default_key;
        Key *key = get_key(kn);
        if(!key) {
            fprintf(stderr, "Key %s not found!\nAbort.\n", kn);
            // TODO: free
            return -1;
        }
        if(keyname || repo->encrypt) {
            enc = aes_encrypter_new(key, in, (dav_read_func)fread);
        }
    }
    if(enc) {
        dav_set_content(res, enc, (dav_read_func)aes_read);
        dav_set_property_ns(res, "http://www.uap-core.de/", "crypto-key", kn);
    } else {
        dav_set_content(res, in, (dav_read_func)fread);
    }
    
    if(dav_store(res)) {
        print_resource_error(sn, res);
        fprintf(stderr, "Cannot upload file.\n");
        fclose(in);
        return -1;
    }
    if(enc) {
        aes_encrypter_close(enc);
    }
    fclose(in);
    return 0;
}