1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
8 * Author: Wan-Teh Chang
10 * Given an HTTP URL, httpget uses the GET method to fetch the file.
11 * The fetched file is written to stdout by default, or can be
12 * saved in an output file.
14 * This is a single-threaded program.
26 #include <stdlib.h> /* for atoi */
28 #define FCOPY_BUFFER_SIZE (16 * 1024)
29 #define INPUT_BUFFER_SIZE 1024
36 * A buffer for storing the excess input data for ReadLine.
37 * The data in the buffer starts from (including) the element pointed to
38 * by inputHead, and ends just before (not including) the element pointed
39 * to by inputTail. The buffer is empty if inputHead == inputTail.
42 static char inputBuf[INPUT_BUFFER_SIZE];
44 * inputBufEnd points just past the end of inputBuf
46 static char *inputBufEnd = inputBuf + sizeof(inputBuf);
47 static char *inputHead = inputBuf;
48 static char *inputTail = inputBuf;
50 static PRBool endOfStream = PR_FALSE;
55 * Read in a line of text, terminated by CRLF or LF, from fd into buf.
56 * The terminating CRLF or LF is included (always as '\n'). The text
57 * in buf is terminated by a null byte. The excess bytes are stored in
58 * inputBuf for use in the next ReadLine call or FetchFile call.
59 * Returns the number of bytes in buf. 0 means end of stream. Returns
63 PRInt32 ReadLine(PRFileDesc *fd, char *buf, PRUint32 bufSize)
66 char *bufEnd = buf + bufSize; /* just past the end of buf */
67 PRBool lineFound = PR_FALSE;
68 char *crPtr = NULL; /* points to the CR ('\r') character */
72 PR_ASSERT(inputBuf <= inputHead && inputHead <= inputTail
73 && inputTail <= inputBufEnd);
74 while (lineFound == PR_FALSE && inputHead != inputTail
75 && dst < bufEnd - 1) {
76 if (*inputHead == '\r') {
78 } else if (*inputHead == '\n') {
80 if (crPtr == dst - 1) {
84 *(dst++) = *(inputHead++);
86 if (lineFound == PR_TRUE || dst == bufEnd - 1 || endOfStream == PR_TRUE) {
92 * The input buffer should be empty now
94 PR_ASSERT(inputHead == inputTail);
96 nRead = PR_Read(fd, inputBuf, sizeof(inputBuf));
100 } else if (nRead == 0) {
101 endOfStream = PR_TRUE;
105 inputHead = inputBuf;
106 inputTail = inputBuf + nRead;
110 PRInt32 DrainInputBuffer(char *buf, PRUint32 bufSize)
112 PRInt32 nBytes = inputTail - inputHead;
121 if ((PRInt32) bufSize < nBytes) {
124 memcpy(buf, inputHead, nBytes);
129 PRStatus FetchFile(PRFileDesc *in, PRFileDesc *out)
131 char buf[FCOPY_BUFFER_SIZE];
134 while ((nBytes = DrainInputBuffer(buf, sizeof(buf))) > 0) {
135 if (PR_Write(out, buf, nBytes) != nBytes) {
136 fprintf(stderr, "httpget: cannot write to file\n");
141 /* Input buffer is empty and end of stream */
144 while ((nBytes = PR_Read(in, buf, sizeof(buf))) > 0) {
145 if (PR_Write(out, buf, nBytes) != nBytes) {
146 fprintf(stderr, "httpget: cannot write to file\n");
151 fprintf(stderr, "httpget: cannot read from socket\n");
157 PRStatus FastFetchFile(PRFileDesc *in, PRFileDesc *out, PRUint32 size)
164 PRUint32 bytesToRead;
169 outfMap = PR_CreateFileMap(out, sz64, PR_PROT_READWRITE);
171 addr = PR_MemMap(outfMap, LL_ZERO, size);
173 fprintf(stderr, "cannot memory-map file: (%d, %d)\n", PR_GetError(),
176 PR_CloseFileMap(outfMap);
179 start = (char *) addr;
181 while ((nBytes = DrainInputBuffer(start, rem)) > 0) {
186 /* Input buffer is empty and end of stream */
189 bytesToRead = (rem < FCOPY_BUFFER_SIZE) ? rem : FCOPY_BUFFER_SIZE;
190 while (rem > 0 && (nBytes = PR_Read(in, start, bytesToRead)) > 0) {
193 bytesToRead = (rem < FCOPY_BUFFER_SIZE) ? rem : FCOPY_BUFFER_SIZE;
196 fprintf(stderr, "httpget: cannot read from socket\n");
199 rv = PR_MemUnmap(addr, size);
200 PR_ASSERT(rv == PR_SUCCESS);
201 rv = PR_CloseFileMap(outfMap);
202 PR_ASSERT(rv == PR_SUCCESS);
206 PRStatus ParseURL(char *url, char *host, PRUint32 hostSize,
207 char *port, PRUint32 portSize, char *path, PRUint32 pathSize)
215 if (strncmp(url, "http", 4)) {
216 fprintf(stderr, "httpget: the protocol must be http\n");
219 if (strncmp(url + 4, "://", 3) || url[7] == '\0') {
220 fprintf(stderr, "httpget: malformed URL: %s\n", url);
224 start = end = url + 7;
226 hostEnd = host + hostSize;
227 while (*end && *end != ':' && *end != '/') {
228 if (dst == hostEnd - 1) {
229 fprintf(stderr, "httpget: host name too long\n");
237 PR_snprintf(port, portSize, "%d", 80);
238 PR_snprintf(path, pathSize, "%s", "/");
245 portEnd = port + portSize;
246 while (*end && *end != '/') {
247 if (dst == portEnd - 1) {
248 fprintf(stderr, "httpget: port number too long\n");
255 PR_snprintf(path, pathSize, "%s", "/");
259 PR_snprintf(port, portSize, "%d", 80);
263 pathEnd = path + pathSize;
265 if (dst == pathEnd - 1) {
266 fprintf(stderr, "httpget: file pathname too long\n");
275 void PrintUsage(void) {
276 fprintf(stderr, "usage: httpget url\n"
277 " httpget -o outputfile url\n"
278 " httpget url -o outputfile\n");
281 int main(int argc, char **argv)
284 char buf[PR_NETDB_BUF_SIZE];
286 PRFileDesc *socket = NULL, *file = NULL;
288 char host[HOST_SIZE];
289 char port[PORT_SIZE];
290 char path[PATH_SIZE];
291 char line[LINE_SIZE];
293 PRBool endOfHeader = PR_FALSE;
295 char *fileName = NULL;
298 if (argc != 2 && argc != 4) {
305 * case 1: httpget url
309 if (strcmp(argv[1], "-o") == 0) {
311 * case 2: httpget -o outputfile url
317 * case 3: httpget url -o outputfile
320 if (strcmp(argv[2], "-o") != 0) {
328 if (ParseURL(url, host, sizeof(host), port, sizeof(port),
329 path, sizeof(path)) == PR_FAILURE) {
333 if (PR_GetHostByName(host, buf, sizeof(buf), &hostentry)
335 fprintf(stderr, "httpget: unknown host name: %s\n", host);
339 addr.inet.family = PR_AF_INET;
340 addr.inet.port = PR_htons((short) atoi(port));
341 addr.inet.ip = *((PRUint32 *) hostentry.h_addr_list[0]);
343 socket = PR_NewTCPSocket();
344 if (socket == NULL) {
345 fprintf(stderr, "httpget: cannot create new tcp socket\n");
349 if (PR_Connect(socket, &addr, PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE) {
350 fprintf(stderr, "httpget: cannot connect to http server\n");
355 if (fileName == NULL) {
358 file = PR_Open(fileName, PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE,
361 fprintf(stderr, "httpget: cannot open file %s: (%d, %d)\n",
362 fileName, PR_GetError(), PR_GetOSError());
368 cmdSize = PR_snprintf(buf, sizeof(buf), "GET %s HTTP/1.0\r\n\r\n", path);
369 PR_ASSERT(cmdSize == (PRIntn) strlen("GET HTTP/1.0\r\n\r\n")
370 + (PRIntn) strlen(path));
371 if (PR_Write(socket, buf, cmdSize) != cmdSize) {
372 fprintf(stderr, "httpget: cannot write to http server\n");
377 if (ReadLine(socket, line, sizeof(line)) <= 0) {
378 fprintf(stderr, "httpget: cannot read line from http server\n");
383 /* HTTP response: 200 == OK */
384 if (strstr(line, "200") == NULL) {
385 fprintf(stderr, "httpget: %s\n", line);
390 while (ReadLine(socket, line, sizeof(line)) > 0) {
391 if (line[0] == '\n') {
392 endOfHeader = PR_TRUE;
395 if (strncmp(line, "Content-Length", 14) == 0
396 || strncmp(line, "Content-length", 14) == 0) {
399 while (*p == ' ' || *p == '\t') {
406 while (*p == ' ' || *p == '\t') {
410 while ('0' <= *p && *p <= '9') {
411 fileSize = 10 * fileSize + (*p - '0');
416 if (endOfHeader == PR_FALSE) {
417 fprintf(stderr, "httpget: cannot read line from http server\n");
422 if (fileName == NULL || fileSize == 0) {
423 FetchFile(socket, file);
425 FastFetchFile(socket, file, fileSize);
429 if (socket) PR_Close(socket);
430 if (file) PR_Close(file);