HelenOS sources

root/uspace/app/download/main.c

DEFINITIONS

1. syntax_print
2. main

/*
 * Copyright (c) 2013 Martin Sucha
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup download
 * @{
 */

/** @file
 * Download a file from a HTTP server
 *
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <str_error.h>
#include <task.h>
#include <macros.h>

#include <http/http.h>
#include <uri.h>

#define NAME "download"
#ifdef TIMESTAMP_UNIX
#define VERSION STRING(HELENOS_RELEASE) "-" STRING(TIMESTAMP_UNIX)
#else
#define VERSION STRING(HELENOS_RELEASE)
#endif
#define USER_AGENT "HelenOS-" NAME "/" VERSION

static void syntax_print(void)
{
        fprintf(stderr, "Usage: download [-o <outfile>] <url>\n");
        fprintf(stderr, "  Without -o, data will be written to stdout, so you may want\n");
        fprintf(stderr, "  to redirect the output, e.g.\n");
        fprintf(stderr, "\n");
        fprintf(stderr, "    download http://helenos.org/ | to helenos.html\n\n");
}

int main(int argc, char *argv[])
{
        int i;
        char *ofname = NULL;
        FILE *ofile = NULL;
        size_t buf_size = 4096;
        void *buf = NULL;
        uri_t *uri = NULL;
        http_t *http = NULL;
        errno_t rc;
        int ret;

        if (argc < 2) {
                syntax_print();
                rc = EINVAL;
                goto error;
        }

        i = 1;

        if (str_cmp(argv[i], "-o") == 0) {
                ++i;
                if (argc < i + 1) {
                        syntax_print();
                        rc = EINVAL;
                        goto error;
                }

                ofname = argv[i++];
                ofile = fopen(ofname, "wb");
                if (ofile == NULL) {
                        fprintf(stderr, "Error creating '%s'.\n", ofname);
                        rc = EINVAL;
                        goto error;
                }
        }

        if (argc != i + 1) {
                syntax_print();
                rc = EINVAL;
                goto error;
        }

        uri = uri_parse(argv[i]);
        if (uri == NULL) {
                fprintf(stderr, "Failed parsing URI\n");
                rc = EINVAL;
                goto error;
        }

        if (!uri_validate(uri)) {
                fprintf(stderr, "The URI is invalid\n");
                rc = EINVAL;
                goto error;
        }

        /* TODO uri_normalize(uri) */

        if (str_cmp(uri->scheme, "http") != 0) {
                fprintf(stderr, "Only http scheme is supported at the moment\n");
                rc = EINVAL;
                goto error;
        }

        if (uri->host == NULL) {
                fprintf(stderr, "host not set\n");
                rc = EINVAL;
                goto error;
        }

        uint16_t port = 80;
        if (uri->port != NULL) {
                rc = str_uint16_t(uri->port, NULL, 10, true, &port);
                if (rc != EOK) {
                        fprintf(stderr, "Invalid port number: %s\n", uri->port);
                        rc = EINVAL;
                        goto error;
                }
        }

        const char *path = uri->path;
        if (path == NULL || *path == 0)
                path = "/";
        char *server_path = NULL;
        if (uri->query == NULL) {
                server_path = str_dup(path);
                if (server_path == NULL) {
                        fprintf(stderr, "Failed allocating path\n");
                        rc = ENOMEM;
                        goto error;
                }
        } else {
                ret = asprintf(&server_path, "%s?%s", path, uri->query);
                if (ret < 0) {
                        fprintf(stderr, "Failed allocating path\n");
                        rc = ENOMEM;
                        goto error;
                }
        }

        http_request_t *req = http_request_create("GET", server_path);
        free(server_path);
        if (req == NULL) {
                fprintf(stderr, "Failed creating request\n");
                rc = ENOMEM;
                goto error;
        }

        rc = http_headers_append(&req->headers, "Host", uri->host);
        if (rc != EOK) {
                fprintf(stderr, "Failed setting Host header: %s\n", str_error(rc));
                goto error;
        }

        rc = http_headers_append(&req->headers, "User-Agent", USER_AGENT);
        if (rc != EOK) {
                fprintf(stderr, "Failed creating User-Agent header: %s\n", str_error(rc));
                goto error;
        }

        http = http_create(uri->host, port);
        if (http == NULL) {
                fprintf(stderr, "Failed creating HTTP object\n");
                rc = ENOMEM;
                goto error;
        }

        rc = http_connect(http);
        if (rc != EOK) {
                fprintf(stderr, "Failed connecting: %s\n", str_error(rc));
                rc = EIO;
                goto error;
        }

        rc = http_send_request(http, req);
        if (rc != EOK) {
                fprintf(stderr, "Failed sending request: %s\n", str_error(rc));
                rc = EIO;
                goto error;
        }

        http_response_t *response = NULL;
        rc = http_receive_response(&http->recv_buffer, &response, 16 * 1024,
            100);
        if (rc != EOK) {
                fprintf(stderr, "Failed receiving response: %s\n", str_error(rc));
                rc = EIO;
                goto error;
        }

        if (response->status != 200) {
                fprintf(stderr, "Server returned status %d %s\n", response->status,
                    response->message);
        } else {
                buf = malloc(buf_size);
                if (buf == NULL) {
                        fprintf(stderr, "Failed allocating buffer\n)");
                        rc = ENOMEM;
                        goto error;
                }

                size_t body_size;
                while ((rc = recv_buffer(&http->recv_buffer, buf, buf_size, &body_size)) == EOK && body_size > 0) {
                        fwrite(buf, 1, body_size, ofile != NULL ? ofile : stdout);
                }

                if (rc != EOK) {
                        fprintf(stderr, "Failed receiving body: %s", str_error(rc));
                }
        }

        free(buf);
        http_destroy(http);
        uri_destroy(uri);
        if (ofile != NULL && fclose(ofile) != 0) {
                printf("Error writing '%s'.\n", ofname);
                return EIO;
        }

        return EOK;
error:
        free(buf);
        if (http != NULL)
                http_destroy(http);
        if (uri != NULL)
                uri_destroy(uri);
        if (ofile != NULL)
                fclose(ofile);
        return rc;
}

/** @}
 */