nsprpub/tools/httpget.c
author Mike Hommey <mh+mozilla@glandium.org>
Thu, 21 Jan 2016 17:08:53 +0900
changeset 318094 abd3c51d6eb1146dee3147845cfa65e954445eca
parent 98224 d37d4edce6dd592f04afa606deb1ae327c07b4a4
child 561364 679ba7a64a774209a7cc8444ef6d548ac5add9f1
permissions -rw-r--r--
Bug 1241416 - Create a tier for things happening before export. r=gps While it would be possible to move those things in the export tier, it is still interesting to have reporting for them separately, especially considering I expect things to gradually move from the other tiers to this new one. While not entirely obvious, the recurse_pre-export target doesn't imply actual recursion as long as the RecursiveMake backend doesn't emit traversal information for it, so nothing will actually happen on this target, but the interesting part is that it runs, per the generic config/recurse.mk rules for tiers, between BUILDSTATUS TIER_START and BUILDSTATUS TIER_FINISH, so that all its dependencies are accounted as being part of the pre-export tier.

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */


/*
 * Author: Wan-Teh Chang
 *
 * Given an HTTP URL, httpget uses the GET method to fetch the file.
 * The fetched file is written to stdout by default, or can be
 * saved in an output file.
 *
 * This is a single-threaded program.
 */

#include "prio.h"
#include "prnetdb.h"
#include "prlog.h"
#include "prerror.h"
#include "prprf.h"
#include "prinit.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>  /* for atoi */

#define FCOPY_BUFFER_SIZE (16 * 1024)
#define INPUT_BUFFER_SIZE 1024
#define LINE_SIZE 512
#define HOST_SIZE 256
#define PORT_SIZE 32
#define PATH_SIZE 512

/*
 * A buffer for storing the excess input data for ReadLine.
 * The data in the buffer starts from (including) the element pointed to
 * by inputHead, and ends just before (not including) the element pointed
 * to by inputTail.  The buffer is empty if inputHead == inputTail.
 */

static char inputBuf[INPUT_BUFFER_SIZE];
/*
 * inputBufEnd points just past the end of inputBuf
 */
static char *inputBufEnd = inputBuf + sizeof(inputBuf);
static char *inputHead = inputBuf;
static char *inputTail = inputBuf;

static PRBool endOfStream = PR_FALSE;

/*
 * ReadLine --
 *
 * Read in a line of text, terminated by CRLF or LF, from fd into buf.
 * The terminating CRLF or LF is included (always as '\n').  The text
 * in buf is terminated by a null byte.  The excess bytes are stored in
 * inputBuf for use in the next ReadLine call or FetchFile call.
 * Returns the number of bytes in buf.  0 means end of stream.  Returns
 * -1 if read fails.
 */

PRInt32 ReadLine(PRFileDesc *fd, char *buf, PRUint32 bufSize)
{
    char *dst = buf;
    char *bufEnd = buf + bufSize;  /* just past the end of buf */
    PRBool lineFound = PR_FALSE;
    char *crPtr = NULL;  /* points to the CR ('\r') character */
    PRInt32 nRead;

loop:
    PR_ASSERT(inputBuf <= inputHead && inputHead <= inputTail
	    && inputTail <= inputBufEnd);
    while (lineFound == PR_FALSE && inputHead != inputTail
	    && dst < bufEnd - 1) {
	if (*inputHead == '\r') {
	    crPtr = dst;
	} else if (*inputHead == '\n') {
	    lineFound = PR_TRUE;
	    if (crPtr == dst - 1) {
		dst--; 
	    }
	}
	*(dst++) = *(inputHead++);
    }
    if (lineFound == PR_TRUE || dst == bufEnd - 1 || endOfStream == PR_TRUE) {
	*dst = '\0';
	return dst - buf;
    }

    /*
     * The input buffer should be empty now
     */
    PR_ASSERT(inputHead == inputTail);

    nRead = PR_Read(fd, inputBuf, sizeof(inputBuf));
    if (nRead == -1) {
	*dst = '\0';
	return -1;
    } else if (nRead == 0) {
	endOfStream = PR_TRUE;
	*dst = '\0';
	return dst - buf;
    }
    inputHead = inputBuf;
    inputTail = inputBuf + nRead;
    goto loop;
}

PRInt32 DrainInputBuffer(char *buf, PRUint32 bufSize)
{
    PRInt32 nBytes = inputTail - inputHead;

    if (nBytes == 0) {
	if (endOfStream) {
	    return -1;
	} else {
	    return 0;
	}
    }
    if ((PRInt32) bufSize < nBytes) {
	nBytes = bufSize;
    }
    memcpy(buf, inputHead, nBytes);
    inputHead += nBytes;
    return nBytes;
}

PRStatus FetchFile(PRFileDesc *in, PRFileDesc *out)
{
    char buf[FCOPY_BUFFER_SIZE];
    PRInt32 nBytes;

    while ((nBytes = DrainInputBuffer(buf, sizeof(buf))) > 0) {
	if (PR_Write(out, buf, nBytes) != nBytes) {
            fprintf(stderr, "httpget: cannot write to file\n");
	    return PR_FAILURE;
	}
    }
    if (nBytes < 0) {
	/* Input buffer is empty and end of stream */
	return PR_SUCCESS;
    }
    while ((nBytes = PR_Read(in, buf, sizeof(buf))) > 0) {
	if (PR_Write(out, buf, nBytes) != nBytes) {
	    fprintf(stderr, "httpget: cannot write to file\n");
	    return PR_FAILURE;
        }
    }
    if (nBytes < 0) {
	fprintf(stderr, "httpget: cannot read from socket\n");
	return PR_FAILURE;
    }
    return PR_SUCCESS;
}

PRStatus FastFetchFile(PRFileDesc *in, PRFileDesc *out, PRUint32 size)
{
    PRInt32 nBytes;
    PRFileMap *outfMap;
    void *addr;
    char *start;
    PRUint32 rem;
    PRUint32 bytesToRead;
    PRStatus rv;
    PRInt64 sz64;

    LL_UI2L(sz64, size);
    outfMap = PR_CreateFileMap(out, sz64, PR_PROT_READWRITE);
    PR_ASSERT(outfMap);
    addr = PR_MemMap(outfMap, LL_ZERO, size);
    if (addr == NULL) {
	fprintf(stderr, "cannot memory-map file: (%d, %d)\n", PR_GetError(),
		PR_GetOSError());

	PR_CloseFileMap(outfMap);
	return PR_FAILURE;
    }
    start = (char *) addr;
    rem = size;
    while ((nBytes = DrainInputBuffer(start, rem)) > 0) {
	start += nBytes;
	rem -= nBytes;
    }
    if (nBytes < 0) {
	/* Input buffer is empty and end of stream */
	return PR_SUCCESS;
    }
    bytesToRead = (rem < FCOPY_BUFFER_SIZE) ? rem : FCOPY_BUFFER_SIZE;
    while (rem > 0 && (nBytes = PR_Read(in, start, bytesToRead)) > 0) {
	start += nBytes;
	rem -= nBytes;
        bytesToRead = (rem < FCOPY_BUFFER_SIZE) ? rem : FCOPY_BUFFER_SIZE;
    }
    if (nBytes < 0) {
	fprintf(stderr, "httpget: cannot read from socket\n");
	return PR_FAILURE;
    }
    rv = PR_MemUnmap(addr, size);
    PR_ASSERT(rv == PR_SUCCESS);
    rv = PR_CloseFileMap(outfMap);
    PR_ASSERT(rv == PR_SUCCESS);
    return PR_SUCCESS;
}

PRStatus ParseURL(char *url, char *host, PRUint32 hostSize,
    char *port, PRUint32 portSize, char *path, PRUint32 pathSize)
{
    char *start, *end;
    char *dst;
    char *hostEnd;
    char *portEnd;
    char *pathEnd;

    if (strncmp(url, "http", 4)) {
	fprintf(stderr, "httpget: the protocol must be http\n");
	return PR_FAILURE;
    }
    if (strncmp(url + 4, "://", 3) || url[7] == '\0') {
	fprintf(stderr, "httpget: malformed URL: %s\n", url);
	return PR_FAILURE;
    }

    start = end = url + 7;
    dst = host;
    hostEnd = host + hostSize;
    while (*end && *end != ':' && *end != '/') {
	if (dst == hostEnd - 1) {
	    fprintf(stderr, "httpget: host name too long\n");
	    return PR_FAILURE;
	}
	*(dst++) = *(end++);
    }
    *dst = '\0';

    if (*end == '\0') {
	PR_snprintf(port, portSize, "%d", 80);
	PR_snprintf(path, pathSize, "%s", "/");
	return PR_SUCCESS;
    }

    if (*end == ':') {
	end++;
	dst = port;
	portEnd = port + portSize;
	while (*end && *end != '/') {
	    if (dst == portEnd - 1) {
		fprintf(stderr, "httpget: port number too long\n");
		return PR_FAILURE;
	    }
	    *(dst++) = *(end++);
        }
	*dst = '\0';
	if (*end == '\0') {
	    PR_snprintf(path, pathSize, "%s", "/");
	    return PR_SUCCESS;
        }
    } else {
	PR_snprintf(port, portSize, "%d", 80);
    }

    dst = path;
    pathEnd = path + pathSize;
    while (*end) {
	if (dst == pathEnd - 1) {
	    fprintf(stderr, "httpget: file pathname too long\n");
	    return PR_FAILURE;
	}
	*(dst++) = *(end++);
    }
    *dst = '\0';
    return PR_SUCCESS;
}

void PrintUsage(void) {
    fprintf(stderr, "usage: httpget url\n"
		    "       httpget -o outputfile url\n"
		    "       httpget url -o outputfile\n");
}

int main(int argc, char **argv)
{
    PRHostEnt hostentry;
    char buf[PR_NETDB_BUF_SIZE];
    PRNetAddr addr;
    PRFileDesc *socket = NULL, *file = NULL;
    PRIntn cmdSize;
    char host[HOST_SIZE];
    char port[PORT_SIZE];
    char path[PATH_SIZE];
    char line[LINE_SIZE];
    int exitStatus = 0;
    PRBool endOfHeader = PR_FALSE;
    char *url;
    char *fileName = NULL;
    PRUint32 fileSize;

    if (argc != 2 && argc != 4) {
	PrintUsage();
	exit(1);
    }

    if (argc == 2) {
	/*
	 * case 1: httpget url
	 */
	url = argv[1];
    } else {
	if (strcmp(argv[1], "-o") == 0) {
	    /*
	     * case 2: httpget -o outputfile url
	     */
	    fileName = argv[2];
	    url = argv[3];
        } else {
	    /*
	     * case 3: httpget url -o outputfile
	     */
	    url = argv[1];
	    if (strcmp(argv[2], "-o") != 0) {
		PrintUsage();
		exit(1);
            }
	    fileName = argv[3];
	}
    }

    if (ParseURL(url, host, sizeof(host), port, sizeof(port),
	    path, sizeof(path)) == PR_FAILURE) {
	exit(1);
    }

    if (PR_GetHostByName(host, buf, sizeof(buf), &hostentry)
	    == PR_FAILURE) {
        fprintf(stderr, "httpget: unknown host name: %s\n", host);
	exit(1);
    }

    addr.inet.family = PR_AF_INET;
    addr.inet.port = PR_htons((short) atoi(port));
    addr.inet.ip = *((PRUint32 *) hostentry.h_addr_list[0]);

    socket = PR_NewTCPSocket();
    if (socket == NULL) {
	fprintf(stderr, "httpget: cannot create new tcp socket\n");
	exit(1);
    }

    if (PR_Connect(socket, &addr, PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE) {
	fprintf(stderr, "httpget: cannot connect to http server\n");
	exitStatus = 1;
	goto done;
    }

    if (fileName == NULL) {
	file = PR_STDOUT;
    } else {
        file = PR_Open(fileName, PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE,
		00777);
        if (file == NULL) {
	    fprintf(stderr, "httpget: cannot open file %s: (%d, %d)\n",
		    fileName, PR_GetError(), PR_GetOSError());
	    exitStatus = 1;
	    goto done;
	}
    }

    cmdSize = PR_snprintf(buf, sizeof(buf), "GET %s HTTP/1.0\r\n\r\n", path);
    PR_ASSERT(cmdSize == (PRIntn) strlen("GET  HTTP/1.0\r\n\r\n")
            + (PRIntn) strlen(path));
    if (PR_Write(socket, buf, cmdSize) != cmdSize) {
	fprintf(stderr, "httpget: cannot write to http server\n");
	exitStatus = 1;
	goto done;
    }

    if (ReadLine(socket, line, sizeof(line)) <= 0) {
	fprintf(stderr, "httpget: cannot read line from http server\n");
	exitStatus = 1;
	goto done;
    }

    /* HTTP response: 200 == OK */
    if (strstr(line, "200") == NULL) {
	fprintf(stderr, "httpget: %s\n", line);
	exitStatus = 1;
	goto done;
    }

    while (ReadLine(socket, line, sizeof(line)) > 0) {
	if (line[0] == '\n') {
	    endOfHeader = PR_TRUE;
	    break;
	}
	if (strncmp(line, "Content-Length", 14) == 0
		|| strncmp(line, "Content-length", 14) == 0) {
	    char *p = line + 14;

	    while (*p == ' ' || *p == '\t') {
		p++;
	    }
	    if (*p != ':') {
		continue;
            }
	    p++;
	    while (*p == ' ' || *p == '\t') {
		p++;
	    }
	    fileSize = 0;
	    while ('0' <= *p && *p <= '9') {
		fileSize = 10 * fileSize + (*p - '0');
		p++;
            }
	}
    }
    if (endOfHeader == PR_FALSE) {
	fprintf(stderr, "httpget: cannot read line from http server\n");
	exitStatus = 1;
	goto done;
    }

    if (fileName == NULL || fileSize == 0) {
        FetchFile(socket, file);
    } else {
	FastFetchFile(socket, file, fileSize);
    }

done:
    if (socket) PR_Close(socket);
    if (file) PR_Close(file);
    PR_Cleanup();
    return exitStatus;
}