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https://github.com/sheumann/NetDisk.git
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Add code to parse status line and headers of an HTTP response to our request.
This commit is contained in:
Stephen Heumann
parent
7c0a2b8c35
commit
133c7f17b1
244
http.c
244
http.c
@ -3,9 +3,34 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <types.h>
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#include <tcpip.h>
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#include <misctool.h>
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#include <memory.h>
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#include <orca.h>
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#include <errno.h>
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#include "session.h"
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#include "http.h"
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#include "tcpconnection.h"
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#include "strcasecmp.h"
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#define buffTypePointer 0x0000 /* For TCPIPReadTCP() */
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#define buffTypeHandle 0x0001
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#define buffTypeNewHandle 0x0002
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#define HTTP_RESPONSE_TIMEOUT 15 /* seconds to wait for response headers */
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#define MAX_REDIRECTS 5
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enum ResponseHeader {
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UNKNOWN_HEADER = 0,
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CONTENT_RANGE,
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CONTENT_LENGTH,
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TRANSFER_ENCODING,
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CONTENT_ENCODING,
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LOCATION,
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};
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Boolean BuildHTTPRequest(Session *sess, char *resourceStr) {
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int sizeNeeded = 0;
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@ -49,5 +74,222 @@ Boolean BuildHTTPRequest(Session *sess, char *resourceStr) {
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}
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void UpdateRequestRange(Session *sess, unsigned long start, unsigned long end) {
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snprintf(sess->httpRequestRange, 10+1+10+5, "%lu-%lu\r\n\r\n", start, end);
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int count =
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snprintf(sess->httpRequestRange, 10+1+10+5, "%lu-%lu\r\n\r\n", start, end);
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sess->httpRequestLen = sess->httpRequestRange - sess->httpRequest + count;
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}
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#pragma debug -1
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enum RequestResult DoHTTPRequest(Session *sess) {
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top:;
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rlrBuff rlrBuff = {0};
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Word tcpError;
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Boolean wantRedirect = FALSE;
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enum RequestResult result;
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/* Send out request */
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result = NETWORK_ERROR;
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tcpError = TCPIPWriteTCP(sess->ipid, sess->httpRequest,
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sess->httpRequestLen, TRUE, FALSE);
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if (tcpError || toolerror())
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goto errorReturn;
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/* Get response status line & headers */
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LongWord startTime = GetTick();
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do {
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TCPIPPoll();
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tcpError = TCPIPReadLineTCP(sess->ipid,
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(void*)((LongWord)"\p\r\n\r\n" | 0x80000000),
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buffTypeNewHandle, (Ref)NULL,
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0xFFFFFF, &rlrBuff);
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if (tcpError || toolerror())
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goto errorReturn;
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} while (rlrBuff.rlrBuffCount == 0
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&& GetTick() - startTime < HTTP_RESPONSE_TIMEOUT * 60);
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result = NO_RESPONSE;
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if (!rlrBuff.rlrIsDataFlag)
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goto errorReturn;
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result = INVALID_RESPONSE;
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/* Response must be at least long enough for a status line & final CRLF */
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if (rlrBuff.rlrBuffCount < 8+1+3+1+2+2)
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goto errorReturn;
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HLock(rlrBuff.rlrBuffHandle);
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char *response = *rlrBuff.rlrBuffHandle;
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char *responseEnd = response + rlrBuff.rlrBuffCount;
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/* Make response a C-string. Specifically, it will end "CR LF NUL NUL". */
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response[rlrBuff.rlrBuffCount - 2] = '\0';
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response[rlrBuff.rlrBuffCount - 1] = '\0';
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/* Parse status line of HTTP response */
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char *endPtr;
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if (strncmp(response, "HTTP/1.", 7) != 0)
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goto errorReturn;
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response += 7;
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if (!(*response >= '1' && *response <= '9'))
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goto errorReturn;
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response += 1;
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if (*response != ' ')
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goto errorReturn;
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response += 1;
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errno = 0;
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sess->responseCode = strtoul(response, &endPtr, 10);
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if (errno || sess->responseCode > 999 || endPtr != response + 3)
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goto errorReturn;
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response += 3;
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if (*response != ' ')
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goto errorReturn;
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response++;
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while (*response != '\r' && response < responseEnd)
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response++;
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response++;
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if (*response != '\n' && response < responseEnd)
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goto errorReturn;
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response++;
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switch(sess->responseCode) {
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/* "Partial content" response, as expected */
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case 206:
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break;
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/* Redirect responses */
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case 300: case 301: case 302: case 307: case 308:
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if (sess->redirectCount < MAX_REDIRECTS) {
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sess->redirectCount++;
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wantRedirect = TRUE;
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break;
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} else {
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result = EXCESSIVE_REDIRECTS;
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goto errorReturn;
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}
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default:
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result = UNSUPPORTED_RESPONSE;
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goto errorReturn;
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}
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/* Parse response headers */
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sess->rangeStart = 0;
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sess->rangeEnd = 0;
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sess->totalLength = 0;
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sess->contentLength = 0;
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result = UNSUPPORTED_HEADER_VALUE;
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while (response < responseEnd - 2) {
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enum ResponseHeader header = UNKNOWN_HEADER;
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if (strncasecmp(response, "Content-Range:", 14) == 0) {
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response += 14;
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header = CONTENT_RANGE;
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} else if (strncasecmp(response, "Content-Length:", 15) == 0) {
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response += 15;
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header = CONTENT_LENGTH;
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} else if (strncasecmp(response, "Transfer-Encoding:", 18) == 0) {
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response += 18;
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header = TRANSFER_ENCODING;
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} else if (strncasecmp(response, "Content-Encoding:", 17) == 0) {
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response += 17;
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header = CONTENT_ENCODING;
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} else if (strncasecmp(response, "Location:", 9) == 0) {
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response += 9;
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header = LOCATION;
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}
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while ((*response == ' ' || *response == '\t') && response < responseEnd)
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response++;
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switch (header) {
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case CONTENT_RANGE:
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if (strncasecmp(response, "bytes ", 6) != 0)
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goto errorReturn;
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response += 6;
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errno = 0;
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sess->rangeStart = strtoul(response, &response, 10);
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if (errno)
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goto errorReturn;
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if (*response != '-')
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goto errorReturn;
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response++;
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sess->rangeEnd = strtoul(response, &response, 10);
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if (errno || sess->rangeEnd == 0)
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goto errorReturn;
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if (*response != '/')
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goto errorReturn;
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response++;
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/* require numeric total length, not indeterminate '*' */
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sess->totalLength = strtoul(response, &response, 10);
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if (errno || sess->totalLength == 0)
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goto errorReturn;
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break;
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case CONTENT_LENGTH:
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errno = 0;
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sess->contentLength = strtoul(response, &endPtr, 10);
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if (errno || sess->contentLength == 0)
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goto errorReturn;
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response = endPtr;
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break;
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case CONTENT_ENCODING:
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case TRANSFER_ENCODING:
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if (strcasecmp(response, "identity") == 0) {
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response += 8;
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} else {
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goto errorReturn;
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}
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break;
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case LOCATION: /*TODO*/ ;
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/* Unknown headers: ignored */
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case UNKNOWN_HEADER:
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default:
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while (*response != '\r' && response < responseEnd)
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response++;
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break;
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}
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while ((*response == ' ' || *response == '\t') && response < responseEnd)
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response++;
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if (*response != '\r')
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goto errorReturn;
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response++;
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if (*response != '\n')
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goto errorReturn;
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response++;
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}
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/* Wanted redirect, but to Location header found */
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if (wantRedirect) {
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result = UNSUPPORTED_RESPONSE;
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goto errorReturn;
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}
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DisposeHandle(rlrBuff.rlrBuffHandle);
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return REQUEST_SUCCESSFUL;
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errorReturn:
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if (rlrBuff.rlrBuffHandle != NULL) {
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DisposeHandle(rlrBuff.rlrBuffHandle);
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}
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/* Error condition on this TCP connection means it can't be reused. */
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EndTCPConnection(sess);
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return result;
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}
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11
http.h
11
http.h
@ -4,7 +4,18 @@
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#include <types.h>
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#include "session.h"
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enum RequestResult {
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REQUEST_SUCCESSFUL = 0,
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NETWORK_ERROR,
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NO_RESPONSE,
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INVALID_RESPONSE,
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EXCESSIVE_REDIRECTS,
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UNSUPPORTED_RESPONSE,
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UNSUPPORTED_HEADER_VALUE,
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};
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Boolean BuildHTTPRequest(Session *sess, char *resourceStr);
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void UpdateRequestRange(Session *sess, unsigned long start, unsigned long end);
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enum RequestResult DoHTTPRequest(Session *sess);
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#endif
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38
main.c
38
main.c
@ -11,18 +11,12 @@
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#include "seturl.h"
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#include "hostname.h"
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#define buffTypePointer 0x0000 /* For TCPIPReadTCP() */
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#define buffTypeHandle 0x0001
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#define buffTypeNewHandle 0x0002
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/*
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http://archive.org/download/a2gs_System_1.0_1986_Apple_FW/System_1.0_1986_Apple_FW.2mg
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redirects to:
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http://ia800505.us.archive.org/16/items/a2gs_System_1.0_1986_Apple_FW/System_1.0_1986_Apple_FW.2mg
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*/
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static char delimitStr[] = "\p\r\n\r\n";
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char *defaultURL = "http://ia800505.us.archive.org/16/items/a2gs_System_1.0_1986_Apple_FW/System_1.0_1986_Apple_FW.2mg";
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@ -72,32 +66,16 @@ int main(int argc, char **argv) {
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goto exit;
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}
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TCPIPWriteTCP(sess.ipid, sess.httpRequest, strlen(sess.httpRequest), TRUE, FALSE);
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enum RequestResult requestResult = DoHTTPRequest(&sess);
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printf("RequestResult %i\n", requestResult);
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rlrBuff rlrBuff = {0};
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Word tcpError;
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do {
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TCPIPPoll();
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tcpError = TCPIPReadLineTCP(sess.ipid,
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(void*)((LongWord)delimitStr | 0x80000000),
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buffTypeNewHandle, (Ref)NULL,
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0xFFFFFF, &rlrBuff);
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if (tcpError || toolerror()) {
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printf("tcpError = %u, toolerror = %u\n", tcpError, toolerror());
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break;
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}
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} while (rlrBuff.rlrBuffCount == 0);
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printf("Response:\n");
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printf("=========\n");
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for (int i = 0; i < rlrBuff.rlrBuffCount; i++) {
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char ch = ((char*)*(rlrBuff.rlrBuffHandle))[i];
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if (ch != '\r')
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putchar(ch);
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if (requestResult == REQUEST_SUCCESSFUL) {
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printf("rangeStart = %lu\n", sess.rangeStart);
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printf("rangeEnd = %lu\n", sess.rangeEnd);
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printf("totalLength = %lu\n", sess.totalLength);
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printf("contentLength = %lu\n", sess.contentLength);
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}
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printf("=========\n");
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printf("Response size = %lu\n", rlrBuff.rlrBuffCount);
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EndTCPConnection(&sess);
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exit:
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13
session.h
13
session.h
@ -20,6 +20,11 @@ typedef struct Session {
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char *httpRequest;
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/* Pointer to the range part within httpRequest */
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char *httpRequestRange;
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/* Length of HTTP request */
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LongWord httpRequestLen;
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/* HTTP response code */
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unsigned long responseCode;
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/* IP address and TCP port of host */
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LongWord ipAddr;
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@ -29,6 +34,14 @@ typedef struct Session {
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char hostName[257];
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/* Time (GetTick) of last DNS lookup */
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LongWord dnsTime;
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/* Number of redirects followed */
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Word redirectCount;
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/* Values reported by server in Content-Range header */
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LongWord rangeStart, rangeEnd, totalLength;
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/* Value reported by server in Content-Length header */
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LongWord contentLength;
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} Session;
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#endif
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2
seturl.c
2
seturl.c
@ -21,7 +21,7 @@ SetURL(Session *sess, char *url, Boolean permissive, Boolean partialOK) {
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}
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for(unsigned int i = 0; url[i] != '\0'; i++) {
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if (url[i] <= ' ' && url[i] >= 0) {
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if ((unsigned char)url[i] <= ' ') {
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return INVALID_CHARACTER_IN_URL;
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}
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}
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@ -25,8 +25,8 @@ URLParts ParseURL(char *url) {
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/* Detect relative URL (absolute-path reference only) */
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if (url[0] == '/') {
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if (url[1] != '/') {
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url++;
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goto pathPart;
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urlParts.path = url + 1;
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return urlParts;
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} else {
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urlParts.errorFound = 1;
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return urlParts;
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@ -90,7 +90,6 @@ URLParts ParseURL(char *url) {
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urlParts.port = sep + 1;
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}
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pathPart:
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return urlParts;
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}
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