Annotation of libwww/Library/src/HTTP.c, revision 1.44
1.44 ! frystyk 1: /* HyperText73 Tranfer Protocol - Client implementation HTTP.c
1.1 timbl 2: ** ==========================
1.2 timbl 3: **
4: ** Bugs:
5: ** Not implemented:
6: ** Forward
7: ** Redirection
8: ** Error handling
1.1 timbl 9: */
10:
11: /* Module parameters:
12: ** -----------------
13: **
14: ** These may be undefined and redefined by syspec.h
15: */
1.2 timbl 16:
17: /* Implements:
18: */
19: #include "HTTP.h"
20:
21: #define HTTP_VERSION "HTTP/1.0"
22: #define HTTP2 /* Version is greater than 0.9 */
23:
24: #define INIT_LINE_SIZE 1024 /* Start with line buffer this big */
25: #define LINE_EXTEND_THRESH 256 /* Minimum read size */
26: #define VERSION_LENGTH 20 /* for returned protocol version */
27:
28: /* Uses:
29: */
1.1 timbl 30: #include "HTParse.h"
31: #include "HTUtils.h"
32: #include "tcp.h"
33: #include "HTTCP.h"
34: #include "HTFormat.h"
1.2 timbl 35: #include <ctype.h>
36: #include "HTAlert.h"
37: #include "HTMIME.h"
1.5 timbl 38: #include "HTML.h" /* SCW */
39: #include "HTInit.h" /* SCW */
1.21 luotonen 40: #include "HTAccess.h" /* HTRequest */
1.14 luotonen 41: #include "HTAABrow.h" /* Access Authorization */
1.20 timbl 42: #include "HTTee.h" /* Tee off a cache stream */
43: #include "HTFWriter.h" /* Write to cache file */
1.1 timbl 44:
1.2 timbl 45: struct _HTStream {
46: HTStreamClass * isa; /* all we need to know */
47: };
48:
1.6 timbl 49: extern char * HTAppName; /* Application name: please supply */
50: extern char * HTAppVersion; /* Application version: please supply */
51:
1.19 timbl 52: PUBLIC BOOL HTCacheHTTP = YES; /* Enable caching of HTTP-retrieved files */
1.37 luotonen 53: PUBLIC long HTProxyBytes = 0; /* Number of bytes transferred thru proxy */
54: extern BOOL using_proxy; /* are we using a proxy gateway? */
55: PUBLIC char * HTProxyHeaders = NULL; /* Headers to pass as-is */
1.23 luotonen 56:
1.21 luotonen 57: PRIVATE void parse_401_headers ARGS2(HTRequest *, req,
58: HTInputSocket *, isoc)
59: {
60: HTAAScheme scheme;
61: char *line;
62: int num_schemes = 0;
63: HTList *valid_schemes = HTList_new();
64: HTAssocList **scheme_specifics = NULL;
65: char *template = NULL;
66:
67: /* Read server reply header lines */
68:
69: if (TRACE)
70: fprintf(stderr, "Server 401 reply header lines:\n");
71:
72: while (NULL != (line = HTInputSocket_getUnfoldedLine(isoc)) &&
73: *line != 0) {
74:
75: if (TRACE) fprintf(stderr, "%s\n", line);
76:
77: if (strchr(line, ':')) { /* Valid header line */
78:
79: char *p = line;
80: char *fieldname = HTNextField(&p);
81: char *arg1 = HTNextField(&p);
82: char *args = p;
83:
84: if (0==strcasecomp(fieldname, "WWW-Authenticate:")) {
85: if (HTAA_UNKNOWN != (scheme = HTAAScheme_enum(arg1))) {
86: HTList_addObject(valid_schemes, (void*)scheme);
87: if (!scheme_specifics) {
88: int i;
89: scheme_specifics = (HTAssocList**)
90: malloc(HTAA_MAX_SCHEMES * sizeof(HTAssocList*));
91: if (!scheme_specifics)
92: outofmem(__FILE__, "parse_401_headers");
93: for (i=0; i < HTAA_MAX_SCHEMES; i++)
94: scheme_specifics[i] = NULL;
95: }
96: scheme_specifics[scheme] = HTAA_parseArgList(args);
97: num_schemes++;
98: }
99: else if (TRACE) {
100: fprintf(stderr, "Unknown scheme `%s' %s\n",
101: (arg1 ? arg1 : "(null)"),
102: "in WWW-Authenticate: field");
103: }
104: }
105:
106: else if (0==strcasecomp(fieldname, "WWW-Protection-Template:")) {
107: if (TRACE)
108: fprintf(stderr, "Protection template set to `%s'\n", arg1);
109: StrAllocCopy(template, arg1);
110: }
111:
112: } /* if a valid header line */
113: else if (TRACE) {
114: fprintf(stderr, "Invalid header line `%s' ignored\n", line);
115: } /* else invalid header line */
1.44 ! frystyk 116: free(line);
1.21 luotonen 117: } /* while header lines remain */
1.44 ! frystyk 118: FREE(line);
1.21 luotonen 119: req->valid_schemes = valid_schemes;
120: req->scheme_specifics = scheme_specifics;
121: req->prot_template = template;
122: }
123:
124:
125:
1.1 timbl 126: /* Load Document from HTTP Server HTLoadHTTP()
127: ** ==============================
128: **
129: ** Given a hypertext address, this routine loads a document.
130: **
131: **
132: ** On entry,
133: ** arg is the hypertext reference of the article to be loaded.
134: **
135: ** On exit,
136: ** returns >=0 If no error, a good socket number
137: ** <0 Error.
138: **
139: ** The socket must be closed by the caller after the document has been
140: ** read.
141: **
142: */
1.19 timbl 143: PUBLIC int HTLoadHTTP ARGS1 (HTRequest *, request)
1.1 timbl 144: {
1.22 luotonen 145: CONST char * arg = NULL;
1.1 timbl 146: int s; /* Socket number for returned data */
147: int status; /* tcp return */
1.10 timbl 148: char crlf[3]; /* A CR LF equivalent string */
1.3 timbl 149: HTStream * target = NULL; /* Unconverted data */
150:
1.2 timbl 151: CONST char* gate = 0; /* disable this feature */
1.1 timbl 152: SockA soc_address; /* Binary network address */
153: SockA * sin = &soc_address;
1.40 frystyk 154: BOOL extensions = YES; /* Assume good HTTP server */
1.36 frystyk 155:
1.37 luotonen 156: if (HTImProxy) HTProxyBytes = 0;
1.23 luotonen 157:
1.37 luotonen 158: arg = HTAnchor_physical(request->anchor);
1.22 luotonen 159:
1.1 timbl 160: if (!arg) return -3; /* Bad if no name sepcified */
161: if (!*arg) return -2; /* Bad if name had zero length */
162:
163: /* Set up defaults:
164: */
165: #ifdef DECNET
1.2 timbl 166: sin->sdn_family = AF_DECnet; /* Family = DECnet, host order */
167: sin->sdn_objnum = DNP_OBJ; /* Default: http object number */
1.1 timbl 168: #else /* Internet */
1.2 timbl 169: sin->sin_family = AF_INET; /* Family = internet, host order */
170: sin->sin_port = htons(TCP_PORT); /* Default: http port */
1.1 timbl 171: #endif
172:
1.10 timbl 173: sprintf(crlf, "%c%c", CR, LF); /* To be corect on Mac, VM, etc */
174:
1.1 timbl 175: if (TRACE) {
176: if (gate) fprintf(stderr,
177: "HTTPAccess: Using gateway %s for %s\n", gate, arg);
178: else fprintf(stderr, "HTTPAccess: Direct access for %s\n", arg);
179: }
180:
181: /* Get node name and optional port number:
182: */
183: {
184: char *p1 = HTParse(gate ? gate : arg, "", PARSE_HOST);
185: int status = HTParseInet(sin, p1); /* TBL 920622 */
186: free(p1);
187: if (status) return status; /* No such host for example */
188: }
189:
1.15 luotonen 190: /*
191: ** Compose authorization information (this was moved here
192: ** from after the making of the connection so that the connection
193: ** wouldn't have to wait while prompting username and password
194: ** from the user). -- AL 13.10.93
195: */
196: #ifdef ACCESS_AUTH
1.21 luotonen 197: HTAA_composeAuth(request);
198: if (TRACE) {
199: if (request->authorization)
200: fprintf(stderr, "HTTP: Sending Authorization: %s\n",
201: request->authorization);
202: else
203: fprintf(stderr, "HTTP: Not sending authorization (yet)\n");
1.15 luotonen 204: }
205: #endif /* ACCESS_AUTH */
1.1 timbl 206:
1.10 timbl 207: /* Now, let's get a socket set up from the server for the data:
1.1 timbl 208: */
209: #ifdef DECNET
210: s = socket(AF_DECnet, SOCK_STREAM, 0);
211: #else
212: s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
213: #endif
214: status = connect(s, (struct sockaddr*)&soc_address, sizeof(soc_address));
215: if (status < 0) {
216: if (TRACE) fprintf(stderr,
1.30 frystyk 217: "HTTP: Unable to connect to remote host for `%s' (errno = %d).\n",
218: arg, errno);
1.17 timbl 219:
1.1 timbl 220: return HTInetStatus("connect");
221: }
222:
223: if (TRACE) fprintf(stderr, "HTTP connected, socket %d\n", s);
224:
1.17 timbl 225:
226: /* Compose and send command
227: ** ------------------------
228: */
229: {
230: char *command; /* The whole command */
231:
1.1 timbl 232: /* Ask that node for the document,
233: ** omitting the host name & anchor if not gatewayed.
234: */
1.37 luotonen 235: if (gate) { /* This is no longer used, and could be thrown away */
1.17 timbl 236: command = malloc(4 + strlen(arg)+ 2 + 31);
237: if (command == NULL) outofmem(__FILE__, "HTLoadHTTP");
238: strcpy(command, "GET ");
239: strcat(command, arg);
240: } else { /* not gatewayed */
241: char * p1 = HTParse(arg, "", PARSE_PATH|PARSE_PUNCTUATION);
242: command = malloc(4 + strlen(p1)+ 2 + 31);
243: if (command == NULL) outofmem(__FILE__, "HTLoadHTTP");
1.23 luotonen 244: if (request->method != METHOD_INVALID) {
245: strcpy(command, HTMethod_name(request->method));
1.22 luotonen 246: strcat(command, " ");
247: }
248: else {
249: strcpy(command, "GET ");
250: }
1.37 luotonen 251: /* if we are using a proxy gateway don't copy in the first slash
252: ** of say: /gopher://a;lkdjfl;ajdf;lkj/;aldk/adflj
253: ** so that just gohper://.... is sent.
254: */
255: if (using_proxy)
256: strcat(command, p1+1);
257: else
258: strcat(command, p1);
1.17 timbl 259: free(p1);
260: }
1.2 timbl 261: #ifdef HTTP2
1.17 timbl 262: if (extensions) {
263: strcat(command, " ");
264: strcat(command, HTTP_VERSION);
265: }
1.2 timbl 266: #endif
1.17 timbl 267:
268: strcat(command, crlf); /* CR LF, as in rfc 977 */
269:
1.37 luotonen 270: if (extensions && HTImProxy && HTProxyHeaders) {
271: StrAllocCat(command, HTProxyHeaders);
272: }
273: else if (extensions) {
1.21 luotonen 274:
1.17 timbl 275: int i;
276: HTAtom * present = WWW_PRESENT;
277: char line[256]; /*@@@@ */
1.21 luotonen 278: HTList *conversions[2];
279:
1.22 luotonen 280: if (!HTConversions) {
281: HTConversions = HTList_new();
1.34 frystyk 282: /* HTFormatInit(HTConversions); App may do this not us tbl940210 */
1.22 luotonen 283: }
1.28 timbl 284:
1.21 luotonen 285: conversions[0] = HTConversions;
286: conversions[1] = request->conversions;
287:
1.34 frystyk 288:
1.21 luotonen 289: for (i=0; i<2; i++) {
290: HTList *cur = conversions[i];
291: HTPresentation *pres;
292:
293: while ((pres = (HTPresentation*)HTList_nextObject(cur))) {
294: if (pres->rep_out == present) {
295: if (pres->quality != 1.0) {
1.35 frystyk 296: sprintf(line, "Accept: %s; q=%.3f%c%c",
1.21 luotonen 297: HTAtom_name(pres->rep),
298: pres->quality, CR, LF);
299: } else {
300: sprintf(line, "Accept: %s%c%c",
301: HTAtom_name(pres->rep), CR, LF);
302: }
303: StrAllocCat(command, line);
1.17 timbl 304: }
305: }
1.2 timbl 306: }
1.22 luotonen 307:
1.37 luotonen 308: sprintf(line, "User-Agent: %s/%s libwww/%s%c%c",
1.17 timbl 309: HTAppName ? HTAppName : "unknown",
310: HTAppVersion ? HTAppVersion : "0.0",
311: HTLibraryVersion, CR, LF);
1.37 luotonen 312: StrAllocCat(command, line);
313: }
1.22 luotonen 314:
1.17 timbl 315: StrAllocCat(command, crlf); /* Blank line means "end" */
316:
317: if (TRACE) fprintf(stderr, "HTTP Tx: %s\n", command);
318:
319: /* Translate into ASCII if necessary
320: */
1.4 timbl 321: #ifdef NOT_ASCII
1.17 timbl 322: {
323: char * p;
324: for(p = command; *p; p++) {
325: *p = TOASCII(*p);
326: }
1.1 timbl 327: }
1.3 timbl 328: #endif
1.17 timbl 329:
330: status = NETWRITE(s, command, (int)strlen(command));
331: free(command);
332: if (status<0) {
333: if (TRACE) fprintf(stderr,
334: "HTTPAccess: Unable to send command.\n");
1.1 timbl 335: return HTInetStatus("send");
1.17 timbl 336: }
337: } /* compose and send command */
338:
1.2 timbl 339:
1.17 timbl 340: /* Read the response
341: ** -----------------
1.11 timbl 342: **
343: ** HTTP0 servers must return ASCII style text, though it can in
344: ** principle be just text without any markup at all.
345: ** Full HTTP servers must return a response
346: ** line and RFC822 style header. The response must therefore in
347: ** either case have a CRLF somewhere soon.
348: **
349: ** This is the theory. In practice, there are (1993) unfortunately
350: ** many binary documents just served up with HTTP0.9. This
351: ** means we have to preserve the binary buffer (on the assumption that
352: ** conversion from ASCII may lose information) in case it turns
353: ** out that we want the binary original.
1.2 timbl 354: */
1.37 luotonen 355: if (HTImProxy) {
1.24 luotonen 356:
1.22 luotonen 357: /*
358: ** Server as a gateway -- send body of the message
359: ** received from client (if any).
360: */
361: if (request->isoc && request->content_length > 0) {
362: int remain = request->content_length;
363: int i = remain;
364: char * buf;
365:
366: while (remain > 0 &&
367: (buf = HTInputSocket_getBlock(request->isoc, &i))) {
368: int status = NETWRITE(s, buf, i);
369: if (status < 0) {
1.27 luotonen 370: CTRACE(stderr, "HTTPAccess.. Unable to forward body\n");
1.22 luotonen 371: return HTInetStatus("send");
372: }
373: remain -= i;
374: i = remain;
375: }
376: }
1.23 luotonen 377:
378: /*
1.22 luotonen 379: ** Load results directly to client
380: */
1.37 luotonen 381: HTProxyBytes = HTCopy(s, request->output_stream);
1.25 luotonen 382: (*request->output_stream->isa->free)(request->output_stream);
1.37 luotonen 383:
1.22 luotonen 384: return HT_LOADED;
385: }
386: else { /* read response */
1.21 luotonen 387:
1.17 timbl 388: HTFormat format_in; /* Format arriving in the message */
1.21 luotonen 389: HTInputSocket *isoc = HTInputSocket_new(s);
390: char * status_line = HTInputSocket_getStatusLine(isoc);
1.39 frystyk 391: BOOL HTCache_old = HTCacheHTTP; /* Save initial cache conditions */
1.2 timbl 392:
1.11 timbl 393: /* Kludge to trap binary responses from illegal HTTP0.9 servers.
394: ** First time we have enough, look at the stub in ASCII
395: ** and get out of here if it doesn't look right.
396: **
397: ** We also check for characters above 128 in the first few bytes, and
398: ** if we find them we forget the html default.
399: **
400: ** Bugs: A HTTP0.9 server returning a document starting "HTTP/"
401: ** will be taken as a HTTP 1.0 server. Failure.
402: ** An HTTP 0.9 server returning a binary document with
403: ** characters < 128 will be read as ASCII.
404: */
1.36 frystyk 405:
406: /* If HTTP 0 response, then DO NOT CACHE (Henrik 14/02-94) */
407: if (!status_line) {
1.21 luotonen 408: if (HTInputSocket_seemsBinary(isoc)) {
409: format_in = HTAtom_for("www/unknown");
410: }
411: else {
412: format_in = WWW_HTML;
413: }
1.36 frystyk 414: HTCacheHTTP = NO; /* Do not cache */
1.21 luotonen 415: goto copy;
416: } /* end kludge */
417:
418: if (status_line) { /* Decode full HTTP response */
419: /*
420: ** We now have a terminated server status line, and we have
421: ** checked that it is most probably a legal one. Parse it.
422: */
423: char server_version[VERSION_LENGTH+1];
424: int server_status;
425:
426: if (TRACE)
427: fprintf(stderr, "HTTP Status Line: Rx: %.70s\n", status_line);
1.17 timbl 428:
1.21 luotonen 429: sscanf(status_line, "%20s%d", server_version, &server_status);
1.2 timbl 430:
1.21 luotonen 431: format_in = HTAtom_for("www/mime");
1.7 timbl 432:
1.21 luotonen 433: switch (server_status / 100) {
1.2 timbl 434:
1.21 luotonen 435: default: /* bad number */
436: HTAlert("Unknown status reply from server!");
437: break;
1.17 timbl 438:
1.21 luotonen 439: case 3: /* Various forms of redirection */
440: HTAlert(
1.17 timbl 441: "Redirection response from server is not handled by this client");
1.21 luotonen 442: break;
1.17 timbl 443:
1.21 luotonen 444: case 4: /* Access Authorization problem */
1.14 luotonen 445: #ifdef ACCESS_AUTH
1.21 luotonen 446: switch (server_status) {
447: case 401:
448: parse_401_headers(request, isoc);
449:
450: if (TRACE) fprintf(stderr, "%s %d %s\n",
451: "HTTP: close socket", s,
452: "to retry with Access Authorization");
1.24 luotonen 453: if (HTAA_retryWithAuth(request, HTLoadHTTP)) {
1.21 luotonen 454: status = HT_LOADED;/* @@ THIS ONLY WORKS ON LINEMODE */
455: goto clean_up;
456: }
457: /* else falltrough */
458: default:
1.14 luotonen 459: {
1.21 luotonen 460: char *p1 = HTParse(gate ? gate : arg, "",
461: PARSE_HOST);
462: char * message;
463:
464: if (!(message = (char*)malloc(strlen(status_line) +
465: strlen(p1) + 100)))
466: outofmem(__FILE__, "HTTP 4xx status");
1.14 luotonen 467: sprintf(message,
1.21 luotonen 468: "HTTP server at %s replies:\n%s\n\n%s\n",
469: p1, status_line,
470: ((server_status == 401)
471: ? "Access Authorization package giving up.\n"
472: : ""));
1.22 luotonen 473: status = HTLoadError(request, server_status, message);
1.14 luotonen 474: free(message);
475: free(p1);
476: goto clean_up;
477: }
1.21 luotonen 478: } /* switch */
479: goto clean_up;
480: break;
481: #else
482: /* case 4 without Access Authorization falls through */
483: /* to case 5 (previously "I think I goofed"). -- AL */
484: #endif /* ACCESS_AUTH */
485:
486: case 5: /* I think you goofed */
487: {
488: char *p1 = HTParse(gate ? gate : arg, "", PARSE_HOST);
489: char * message = (char*)malloc(strlen(status_line) +
490: strlen(p1) + 100);
491: if (!message) outofmem(__FILE__, "HTTP 5xx status");
492: sprintf(message,
493: "HTTP server at %s replies:\n%s", p1, status_line);
1.22 luotonen 494: status = HTLoadError(request, server_status, message);
1.21 luotonen 495: free(message);
496: free(p1);
497: goto clean_up;
498: }
499: break;
1.17 timbl 500:
1.21 luotonen 501: case 2: /* Good: Got MIME object */
502: break;
1.17 timbl 503:
1.21 luotonen 504: } /* switch on response code */
1.17 timbl 505:
1.21 luotonen 506: } /* Full HTTP reply */
1.17 timbl 507:
508:
1.3 timbl 509: /* Set up the stream stack to handle the body of the message
1.33 timbl 510: **
511: ** In the special case of user asking for source and the message
512: ** being in MIME, we force the MIME decoding to occur, as it is really
513: ** HTTP decoding. If the user really wants the HTTP headers, he
514: ** can ask for them as www/mime.
1.3 timbl 515: */
1.21 luotonen 516:
1.13 duns 517: copy:
1.21 luotonen 518:
1.43 frystyk 519: if ((format_in == WWW_MIME)
520: && (request->output_format == WWW_SOURCE)) {
1.33 timbl 521: target = HTMIMEConvert(request, NULL, format_in,
522: request->output_format, request->output_stream);
523: } else {
524: target = HTStreamStack(format_in, request);
525: }
526:
1.17 timbl 527: if (!target) {
528: char buffer[1024]; /* @@@@@@@@ */
529: sprintf(buffer, "Sorry, no known way of converting %s to %s.",
530: HTAtom_name(format_in), HTAtom_name(request->output_format));
531: fprintf(stderr, "HTTP: %s", buffer);
1.22 luotonen 532: status = HTLoadError(request, 501, buffer);
1.17 timbl 533: goto clean_up;
534: }
535:
1.19 timbl 536: /* @@ Bug: The decision of whether or not to cache should also be
1.21 luotonen 537: ** made contingent on a IP address match or non match.
538: */
1.19 timbl 539: if (HTCacheHTTP) {
540: target = HTTee(target, HTCacheWriter(request, NULL, format_in,
1.21 luotonen 541: request->output_format,
542: request->output_stream));
1.19 timbl 543: }
544:
1.11 timbl 545: /* Push the data down the stream
1.3 timbl 546: ** We have to remember the end of the first buffer we just read
1.2 timbl 547: */
1.30 frystyk 548: if (format_in == WWW_HTML) {
1.17 timbl 549: target = HTNetToText(target); /* Pipe through CR stripper */
550: }
1.21 luotonen 551:
1.17 timbl 552: (*target->isa->put_block)(target,
1.21 luotonen 553: isoc->input_pointer,
554: isoc->input_limit - isoc->input_pointer);
1.41 frystyk 555:
1.17 timbl 556: HTCopy(s, target);
557:
558: (*target->isa->free)(target);
559: status = HT_LOADED;
1.11 timbl 560:
1.2 timbl 561: /* Clean up
1.1 timbl 562: */
1.17 timbl 563:
564: clean_up:
565: if (TRACE) fprintf(stderr, "HTTP: close socket %d.\n", s);
566: (void) NETCLOSE(s);
1.41 frystyk 567: if (isoc)
568: HTInputSocket_free(isoc);
569: if (status_line)
1.38 frystyk 570: free(status_line); /* Leak fix Henrik 18/02-94 */
1.39 frystyk 571: HTCacheHTTP = HTCache_old; /* Reestablish cache conditions */
1.38 frystyk 572: return status; /* Good return */
1.3 timbl 573:
1.17 timbl 574: } /* read response */
575: } /* load HTTP */
1.1 timbl 576:
577: /* Protocol descriptor
578: */
579:
1.17 timbl 580: GLOBALDEF PUBLIC HTProtocol HTTP = { "http", HTLoadHTTP, 0, 0 };
1.21 luotonen 581:
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