/[jscoverage]/trunk/jscoverage-server.c
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Revision 119 - (hide annotations)
Sun Jun 1 14:05:47 2008 UTC (11 years, 2 months ago) by siliconforks
File MIME type: text/plain
File size: 32069 byte(s)
Remove call to `stat'.

1 siliconforks 116 /*
2     jscoverage-server.c - JSCoverage server main routine
3     Copyright (C) 2008 siliconforks.com
4    
5     This program is free software; you can redistribute it and/or modify
6     it under the terms of the GNU General Public License as published by
7     the Free Software Foundation; either version 2 of the License, or
8     (at your option) any later version.
9    
10     This program is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13     GNU General Public License for more details.
14    
15     You should have received a copy of the GNU General Public License along
16     with this program; if not, write to the Free Software Foundation, Inc.,
17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18     */
19    
20     #include <config.h>
21    
22     #include <assert.h>
23     #include <ctype.h>
24     #include <signal.h>
25     #include <string.h>
26    
27     #include <dirent.h>
28     #include <pthread.h>
29    
30     #include "http-server.h"
31     #include "instrument-js.h"
32     #include "resource-manager.h"
33     #include "stream.h"
34     #include "util.h"
35    
36     typedef struct SourceCache {
37     char * url;
38     Stream * source;
39     struct SourceCache * next;
40     } SourceCache;
41    
42     static SourceCache * source_cache = NULL;
43    
44     static const struct {
45     const char * extension;
46     const char * mime_type;
47     } mime_types[] = {
48     {".gif", "image/gif"},
49     {".jpg", "image/jpeg"},
50     {".jpeg", "image/jpeg"},
51     {".png", "image/png"},
52     {".css", "text/css"},
53     {".html", "text/html"},
54     {".htm", "text/html"},
55     {".js", "text/javascript"},
56     {".txt", "text/plain"},
57     {".xml", "application/xml"},
58     };
59    
60     static bool verbose = false;
61     static const char * report_directory = "jscoverage-report";
62     static const char * document_root = ".";
63     static bool proxy = false;
64     static const char ** no_instrument;
65     static size_t num_no_instrument = 0;
66    
67     pthread_mutex_t javascript_mutex = PTHREAD_MUTEX_INITIALIZER;
68     pthread_mutex_t source_cache_mutex = PTHREAD_MUTEX_INITIALIZER;
69    
70     static Stream * find_cached_source(const char * url) {
71     Stream * result = NULL;
72     pthread_mutex_lock(&source_cache_mutex);
73     for (SourceCache * p = source_cache; p != NULL; p = p->next) {
74     if (strcmp(url, p->url) == 0) {
75     result = p->source;
76     break;
77     }
78     }
79     pthread_mutex_unlock(&source_cache_mutex);
80     return result;
81     }
82    
83     static void add_cached_source(const char * url, Stream * source) {
84     SourceCache * new_source_cache = xmalloc(sizeof(SourceCache));
85     new_source_cache->url = xstrdup(url);
86     new_source_cache->source = source;
87     pthread_mutex_lock(&source_cache_mutex);
88     new_source_cache->next = source_cache;
89     source_cache = new_source_cache;
90     pthread_mutex_unlock(&source_cache_mutex);
91     }
92    
93     static int get(const char * url, Stream * stream) __attribute__((warn_unused_result));
94    
95     static int get(const char * url, Stream * stream) {
96     char * host = NULL;
97     uint16_t port;
98     char * abs_path = NULL;
99     char * query = NULL;
100     HTTPConnection * connection = NULL;
101     HTTPExchange * exchange = NULL;
102    
103     int result = URL_parse(url, &host, &port, &abs_path, &query);
104     if (result != 0) {
105     goto done;
106     }
107    
108     connection = HTTPConnection_new_client(host, port);
109     if (connection == NULL) {
110     result = -1;
111     goto done;
112     }
113    
114     exchange = HTTPExchange_new(connection);
115     HTTPExchange_set_request_uri(exchange, url);
116     result = HTTPExchange_write_request_headers(exchange);
117     if (result != 0) {
118     goto done;
119     }
120    
121     result = HTTPExchange_read_response_headers(exchange);
122     if (result != 0) {
123     goto done;
124     }
125    
126     result = HTTPExchange_read_entire_response_entity_body(exchange, stream);
127     if (result != 0) {
128     goto done;
129     }
130    
131     result = 0;
132    
133     done:
134     if (exchange != NULL) {
135     HTTPExchange_delete(exchange);
136     }
137     if (connection != NULL) {
138     if (HTTPConnection_delete(connection) != 0) {
139     HTTPServer_log_err("Warning: error closing connection after retrieving URL: %s\n", url);
140     }
141     }
142     free(host);
143     free(abs_path);
144     free(query);
145     return result;
146     }
147    
148     static void send_response(HTTPExchange * exchange, uint16_t status_code, const char * html) {
149     HTTPExchange_set_status_code(exchange, status_code);
150     if (HTTPExchange_write_response(exchange, html, strlen(html)) != 0) {
151     HTTPServer_log_err("Warning: error writing to client\n");
152     }
153     }
154    
155     /*
156     RFC 2396, Appendix A: we are checking for `pchar'
157     */
158     static bool is_escaped(char c) {
159     /* `pchar' */
160     if (strchr(":@&=+$,", c) != NULL) {
161     return false;
162     }
163    
164     if (isalnum((unsigned char) c)) {
165     return false;
166     }
167    
168     /* `mark' */
169     if (strchr("-_.!~*'()", c) != NULL) {
170     return false;
171     }
172    
173     return true;
174     }
175    
176     static char * encode_uri_component(const char * s) {
177     size_t length = 0;
178     for (const char * p = s; *p != '\0'; p++) {
179     if (is_escaped(*p)) {
180     length = addst(length, 3);
181     }
182     else {
183     length = addst(length, 1);
184     }
185     }
186    
187     length = addst(length, 1);
188     char * result = xmalloc(length);
189     size_t i = 0;
190     for (const char * p = s; *p != '\0'; p++) {
191     if (is_escaped(*p)) {
192     result[i] = '%';
193     i++;
194     snprintf(result + i, 3, "%02X", *p);
195     i += 2;
196     }
197     else {
198     result[i] = *p;
199     i++;
200     }
201     }
202     result[i] = '\0';
203    
204     return result;
205     }
206    
207     static const char * get_entity(char c) {
208     switch(c) {
209     case '<':
210     return "&lt;";
211     case '>':
212     return "&gt;";
213     case '&':
214     return "&amp;";
215     case '\'':
216     return "&apos;";
217     case '"':
218     return "&quot;";
219     default:
220     return NULL;
221     }
222     }
223    
224     static char * encode_html(const char * s) {
225     size_t length = 0;
226     for (const char * p = s; *p != '\0'; p++) {
227     const char * entity = get_entity(*p);
228     if (entity == NULL) {
229     length = addst(length, 1);
230     }
231     else {
232     length = addst(length, strlen(entity));
233     }
234     }
235    
236     length = addst(length, 1);
237     char * result = xmalloc(length);
238     size_t i = 0;
239     for (const char * p = s; *p != '\0'; p++) {
240     const char * entity = get_entity(*p);
241     if (entity == NULL) {
242     result[i] = *p;
243     i++;
244     }
245     else {
246     strcpy(result + i, entity);
247     i += strlen(entity);
248     }
249     }
250     result[i] = '\0';
251    
252     return result;
253     }
254    
255     static const char * get_content_type(const char * path) {
256     char * last_dot = strrchr(path, '.');
257     if (last_dot == NULL) {
258     return "application/octet-stream";
259     }
260     for (size_t i = 0; i < sizeof(mime_types) / sizeof(mime_types[0]); i++) {
261     if (strcmp(last_dot, mime_types[i].extension) == 0) {
262     return mime_types[i].mime_type;
263     }
264     }
265     return "application/octet-stream";
266     }
267    
268     /**
269     Checks whether a URI is on the no-instrument list.
270     @param uri the HTTP "Request-URI"; must not be NULL, and must not be a zero-length string
271     @return true if the URI is on the no-instrument list, false otherwise
272     */
273     static bool is_no_instrument(const char * uri) {
274     assert(*uri != '\0');
275    
276     for (size_t i = 0; i < num_no_instrument; i++) {
277     if (str_starts_with(uri, no_instrument[i])) {
278     return true;
279     }
280    
281     /*
282     For a local URL, accept "/foo/bar" and "foo/bar" on the no-instrument list.
283     */
284     if (! proxy && str_starts_with(uri + 1, no_instrument[i])) {
285     return true;
286     }
287     }
288    
289     return false;
290     }
291    
292     static bool is_javascript(HTTPExchange * exchange) {
293     const char * header = HTTPExchange_find_response_header(exchange, HTTP_CONTENT_TYPE);
294     if (header == NULL) {
295     /* guess based on extension */
296     return str_ends_with(HTTPExchange_get_request_uri(exchange), ".js");
297     }
298     else {
299     char * semicolon = strchr(header, ';');
300     char * content_type;
301     if (semicolon == NULL) {
302     content_type = xstrdup(header);
303     }
304     else {
305     content_type = xstrndup(header, semicolon - header);
306     }
307     /* RFC 4329 */
308     bool result = strcmp(content_type, "text/javascript") == 0 ||
309     strcmp(content_type, "text/ecmascript") == 0 ||
310     strcmp(content_type, "text/javascript1.0") == 0 ||
311     strcmp(content_type, "text/javascript1.1") == 0 ||
312     strcmp(content_type, "text/javascript1.2") == 0 ||
313     strcmp(content_type, "text/javascript1.3") == 0 ||
314     strcmp(content_type, "text/javascript1.4") == 0 ||
315     strcmp(content_type, "text/javascript1.5") == 0 ||
316     strcmp(content_type, "text/jscript") == 0 ||
317     strcmp(content_type, "text/livescript") == 0 ||
318     strcmp(content_type, "text/x-javascript") == 0 ||
319     strcmp(content_type, "text/x-ecmascript") == 0 ||
320     strcmp(content_type, "application/x-javascript") == 0 ||
321     strcmp(content_type, "application/x-ecmascript") == 0 ||
322     strcmp(content_type, "application/javascript") == 0 ||
323     strcmp(content_type, "application/ecmascript") == 0;
324     free(content_type);
325     return result;
326     }
327     }
328    
329     static bool should_instrument_request(HTTPExchange * exchange) {
330     if (! is_javascript(exchange)) {
331     return false;
332     }
333    
334     if (is_no_instrument(HTTPExchange_get_request_uri(exchange))) {
335     return false;
336     }
337    
338     return true;
339     }
340    
341 siliconforks 119 static int merge(Coverage * coverage, FILE * f) __attribute__((warn_unused_result));
342 siliconforks 116
343 siliconforks 119 static int merge(Coverage * coverage, FILE * f) {
344     Stream * stream = Stream_new(0);
345     Stream_write_file_contents(stream, f);
346 siliconforks 116
347     pthread_mutex_lock(&javascript_mutex);
348 siliconforks 119 int result = jscoverage_parse_json(coverage, stream->data, stream->length);
349 siliconforks 116 pthread_mutex_unlock(&javascript_mutex);
350    
351 siliconforks 119 Stream_delete(stream);
352 siliconforks 116 return result;
353     }
354    
355     static void write_js_quoted_string(FILE * f, char * data, size_t length) {
356     putc('"', f);
357     for (size_t i = 0; i < length; i++) {
358     char c = data[i];
359     switch (c) {
360     case '\b':
361     fputs("\\b", f);
362     break;
363     case '\f':
364     fputs("\\f", f);
365     break;
366     case '\n':
367     fputs("\\n", f);
368     break;
369     case '\r':
370     fputs("\\r", f);
371     break;
372     case '\t':
373     fputs("\\t", f);
374     break;
375     case '\v':
376     fputs("\\v", f);
377     break;
378     case '"':
379     fputs("\\\"", f);
380     break;
381     case '\\':
382     fputs("\\\\", f);
383     break;
384     default:
385     putc(c, f);
386     break;
387     }
388     }
389     putc('"', f);
390     }
391    
392     static void write_json_for_file(const FileCoverage * file_coverage, int i, void * p) {
393     FILE * f = p;
394    
395     if (i > 0) {
396     putc(',', f);
397     }
398    
399     write_js_quoted_string(f, file_coverage->id, strlen(file_coverage->id));
400    
401     fputs(":{\"coverage\":[", f);
402     for (uint32_t i = 0; i <= file_coverage->num_lines; i++) {
403     if (i > 0) {
404     putc(',', f);
405     }
406     int timesExecuted = file_coverage->lines[i];
407     if (timesExecuted < 0) {
408     fputs("null", f);
409     }
410     else {
411     fprintf(f, "%d", timesExecuted);
412     }
413     }
414     fputs("],\"source\":", f);
415     if (file_coverage->source == NULL) {
416     if (proxy) {
417     Stream * stream = find_cached_source(file_coverage->id);
418     if (stream == NULL) {
419     stream = Stream_new(0);
420     if (get(file_coverage->id, stream) == 0) {
421     write_js_quoted_string(f, stream->data, stream->length);
422     add_cached_source(file_coverage->id, stream);
423     }
424     else {
425     fputs("\"\"", f);
426     HTTPServer_log_err("Warning: cannot retrieve URL: %s\n", file_coverage->id);
427     Stream_delete(stream);
428     }
429     }
430     else {
431     write_js_quoted_string(f, stream->data, stream->length);
432     }
433     }
434     else {
435     /* check that the path begins with / */
436     if (file_coverage->id[0] == '/') {
437     char * source_path = make_path(document_root, file_coverage->id + 1);
438     FILE * source_file = fopen(source_path, "r");
439     free(source_path);
440     if (source_file == NULL) {
441     fputs("\"\"", f);
442     HTTPServer_log_err("Warning: cannot open file: %s\n", file_coverage->id);
443     }
444     else {
445     Stream * stream = Stream_new(0);
446     Stream_write_file_contents(stream, source_file);
447     fclose(source_file);
448     write_js_quoted_string(f, stream->data, stream->length);
449     Stream_delete(stream);
450     }
451     }
452     else {
453     /* path does not begin with / */
454     fputs("\"\"", f);
455     HTTPServer_log_err("Warning: invalid source path: %s\n", file_coverage->id);
456     }
457     }
458     }
459     else {
460     write_js_quoted_string(f, file_coverage->source, strlen(file_coverage->source));
461     }
462     fputc('}', f);
463     }
464    
465     static int write_json(Coverage * coverage, const char * path) __attribute__((warn_unused_result));
466    
467     static int write_json(Coverage * coverage, const char * path) {
468     /* write the JSON */
469     FILE * f = fopen(path, "w");
470     if (f == NULL) {
471     return -1;
472     }
473     putc('{', f);
474     Coverage_foreach_file(coverage, write_json_for_file, f);
475     putc('}', f);
476     if (fclose(f) == EOF) {
477     return -1;
478     }
479     return 0;
480     }
481    
482     static void handle_jscoverage_request(HTTPExchange * exchange) {
483     /* set the `Server' response-header (RFC 2616 14.38, 3.8) */
484     HTTPExchange_set_response_header(exchange, HTTP_SERVER, "jscoverage-server/" VERSION);
485    
486     const char * abs_path = HTTPExchange_get_abs_path(exchange);
487     assert(*abs_path != '\0');
488     if (str_starts_with(abs_path, "/jscoverage-store")) {
489     if (strcmp(HTTPExchange_get_method(exchange), "POST") != 0) {
490     HTTPExchange_set_response_header(exchange, HTTP_ALLOW, "POST");
491     send_response(exchange, 405, "Method not allowed\n");
492     return;
493     }
494    
495     Stream * json = Stream_new(0);
496    
497     /* read the POST body */
498     if (HTTPExchange_read_entire_request_entity_body(exchange, json) != 0) {
499     Stream_delete(json);
500     send_response(exchange, 400, "Could not read request body\n");
501     return;
502     }
503    
504     Coverage * coverage = Coverage_new();
505     pthread_mutex_lock(&javascript_mutex);
506     int result = jscoverage_parse_json(coverage, json->data, json->length);
507     pthread_mutex_unlock(&javascript_mutex);
508     Stream_delete(json);
509    
510     if (result != 0) {
511     Coverage_delete(coverage);
512     send_response(exchange, 400, "Could not parse coverage data\n");
513     return;
514     }
515    
516     mkdir_if_necessary(report_directory);
517     char * path = make_path(report_directory, "jscoverage.json");
518 siliconforks 119 FILE * f = fopen(path, "r");
519     if (f != NULL) {
520 siliconforks 116 /* it exists: merge */
521 siliconforks 119 result = merge(coverage, f);
522     if (fclose(f) == EOF) {
523     result = 1;
524     }
525 siliconforks 116 if (result != 0) {
526     free(path);
527     Coverage_delete(coverage);
528     send_response(exchange, 500, "Could not merge with existing coverage data\n");
529     return;
530     }
531     }
532    
533     result = write_json(coverage, path);
534     free(path);
535     Coverage_delete(coverage);
536     if (result != 0) {
537     send_response(exchange, 500, "Could not write coverage data\n");
538     return;
539     }
540    
541     /* copy other files */
542     jscoverage_copy_resources(report_directory);
543     path = make_path(report_directory, "jscoverage.js");
544 siliconforks 119 f = fopen(path, "ab");
545 siliconforks 116 free(path);
546     if (f == NULL) {
547     send_response(exchange, 500, "Could not write to file: jscoverage.js\n");
548     return;
549     }
550     fputs("jscoverage_isReport = true;\r\n", f);
551     if (fclose(f) == EOF) {
552     send_response(exchange, 500, "Could not write to file: jscoverage.js\n");
553     return;
554     }
555    
556     send_response(exchange, 200, "Coverage data stored\n");
557     }
558     else if (str_starts_with(abs_path, "/jscoverage-shutdown")) {
559     if (strcmp(HTTPExchange_get_method(exchange), "POST") != 0) {
560     HTTPExchange_set_response_header(exchange, HTTP_ALLOW, "POST");
561     send_response(exchange, 405, "Method not allowed\n");
562     return;
563     }
564    
565     /* allow only from localhost */
566     struct sockaddr_in client;
567     if (HTTPExchange_get_peer(exchange, &client) != 0) {
568     send_response(exchange, 500, "Cannot get client address\n");
569     return;
570     }
571     if (client.sin_addr.s_addr != htonl(INADDR_LOOPBACK)) {
572     send_response(exchange, 403, "This operation can be performed only by localhost\n");
573     return;
574     }
575    
576     send_response(exchange, 200, "The server will now shut down\n");
577     HTTPServer_shutdown();
578     }
579     else {
580     const char * path = abs_path + 1;
581     const struct Resource * resource = get_resource(path);
582     if (resource == NULL) {
583     send_response(exchange, 404, "Not found\n");
584     return;
585     }
586     HTTPExchange_set_response_header(exchange, HTTP_CONTENT_TYPE, get_content_type(path));
587     if (HTTPExchange_write_response(exchange, resource->data, resource->length) != 0) {
588     HTTPServer_log_err("Warning: error writing to client\n");
589     return;
590     }
591     if (strcmp(abs_path, "/jscoverage.js") == 0) {
592     const char * s = "jscoverage_isServer = true;\r\n";
593     if (HTTPExchange_write_response(exchange, s, strlen(s)) != 0) {
594     HTTPServer_log_err("Warning: error writing to client\n");
595     }
596     }
597     }
598     }
599    
600     static void instrument_js(const char * id, Stream * input_stream, Stream * output_stream) {
601     pthread_mutex_lock(&javascript_mutex);
602     jscoverage_instrument_js(id, input_stream, output_stream);
603     pthread_mutex_unlock(&javascript_mutex);
604    
605     const struct Resource * resource = get_resource("report.js");
606     Stream_write(output_stream, resource->data, resource->length);
607     }
608    
609     static bool is_hop_by_hop_header(const char * h) {
610     /* hop-by-hop headers (RFC 2616 13.5.1) */
611     return strcasecmp(h, HTTP_CONNECTION) == 0 ||
612     strcasecmp(h, "Keep-Alive") == 0 ||
613     strcasecmp(h, HTTP_PROXY_AUTHENTICATE) == 0 ||
614     strcasecmp(h, HTTP_PROXY_AUTHORIZATION) == 0 ||
615     strcasecmp(h, HTTP_TE) == 0 ||
616     strcasecmp(h, HTTP_TRAILER) == 0 ||
617     strcasecmp(h, HTTP_TRANSFER_ENCODING) == 0 ||
618     strcasecmp(h, HTTP_UPGRADE) == 0;
619     }
620    
621     static void add_via_header(HTTPMessage * message, const char * version) {
622     char * value;
623     xasprintf(&value, "%s jscoverage-server", version);
624     HTTPMessage_add_header(message, HTTP_VIA, value);
625     free(value);
626     }
627    
628     static int copy_http_message_body(HTTPMessage * from, HTTPMessage * to) __attribute__((warn_unused_result));
629    
630     static int copy_http_message_body(HTTPMessage * from, HTTPMessage * to) {
631     uint8_t * buffer[8192];
632     for (;;) {
633     size_t bytes_read;
634     int result = HTTPMessage_read_message_body(from, buffer, 8192, &bytes_read);
635     if (result != 0) {
636     return result;
637     }
638     if (bytes_read == 0) {
639     return 0;
640     }
641     result = HTTPMessage_write(to, buffer, bytes_read);
642     if (result != 0) {
643     return result;
644     }
645     }
646     }
647    
648     static void handle_proxy_request(HTTPExchange * client_exchange) {
649     HTTPConnection * server_connection = NULL;
650     HTTPExchange * server_exchange = NULL;
651    
652     const char * abs_path = HTTPExchange_get_abs_path(client_exchange);
653     if (str_starts_with(abs_path, "/jscoverage")) {
654     handle_jscoverage_request(client_exchange);
655     return;
656     }
657    
658     const char * host = HTTPExchange_get_host(client_exchange);
659     uint16_t port = HTTPExchange_get_port(client_exchange);
660    
661     /* create a new connection */
662     server_connection = HTTPConnection_new_client(host, port);
663     if (server_connection == NULL) {
664     send_response(client_exchange, 504, "Could not connect to server\n");
665     goto done;
666     }
667    
668     /* create a new exchange */
669     server_exchange = HTTPExchange_new(server_connection);
670     HTTPExchange_set_method(server_exchange, HTTPExchange_get_method(client_exchange));
671     HTTPExchange_set_request_uri(server_exchange, HTTPExchange_get_request_uri(client_exchange));
672     for (const HTTPHeader * h = HTTPExchange_get_request_headers(client_exchange); h != NULL; h = h->next) {
673     if (strcasecmp(h->name, HTTP_TRAILER) == 0 || strcasecmp(h->name, HTTP_TRANSFER_ENCODING) == 0) {
674     /* do nothing: we want to keep this header */
675     }
676     else if (is_hop_by_hop_header(h->name) ||
677     strcasecmp(h->name, HTTP_ACCEPT_ENCODING) == 0 ||
678     strcasecmp(h->name, HTTP_RANGE) == 0) {
679     continue;
680     }
681     HTTPExchange_add_request_header(server_exchange, h->name, h->value);
682     }
683     add_via_header(HTTPExchange_get_request_message(server_exchange), HTTPExchange_get_request_http_version(client_exchange));
684    
685     /* send the request */
686     if (HTTPExchange_write_request_headers(server_exchange) != 0) {
687     send_response(client_exchange, 502, "Could not write to server\n");
688     goto done;
689     }
690    
691     /* handle POST or PUT */
692     if (HTTPExchange_request_has_body(client_exchange)) {
693     HTTPMessage * client_request = HTTPExchange_get_request_message(client_exchange);
694     HTTPMessage * server_request = HTTPExchange_get_request_message(server_exchange);
695     if (copy_http_message_body(client_request, server_request) != 0) {
696     send_response(client_exchange, 400, "Error copying request body from client to server\n");
697     goto done;
698     }
699     }
700    
701     if (HTTPExchange_flush_request(server_exchange) != 0) {
702     send_response(client_exchange, 502, "Could not write to server\n");
703     goto done;
704     }
705    
706     /* receive the response */
707     if (HTTPExchange_read_response_headers(server_exchange) != 0) {
708     send_response(client_exchange, 502, "Could not read headers from server\n");
709     goto done;
710     }
711    
712     HTTPExchange_set_status_code(client_exchange, HTTPExchange_get_status_code(server_exchange));
713    
714     if (HTTPExchange_response_has_body(server_exchange) && should_instrument_request(server_exchange)) {
715     /* needs instrumentation */
716     Stream * input_stream = Stream_new(0);
717     if (HTTPExchange_read_entire_response_entity_body(server_exchange, input_stream) != 0) {
718     Stream_delete(input_stream);
719     send_response(client_exchange, 502, "Could not read body from server\n");
720     goto done;
721     }
722    
723     const char * request_uri = HTTPExchange_get_request_uri(client_exchange);
724     Stream * output_stream = Stream_new(0);
725     instrument_js(request_uri, input_stream, output_stream);
726    
727     /* send the headers to the client */
728     for (const HTTPHeader * h = HTTPExchange_get_response_headers(server_exchange); h != NULL; h = h->next) {
729     if (is_hop_by_hop_header(h->name) || strcasecmp(h->name, HTTP_CONTENT_LENGTH) == 0) {
730     continue;
731     }
732     HTTPExchange_add_response_header(client_exchange, h->name, h->value);
733     }
734     add_via_header(HTTPExchange_get_response_message(client_exchange), HTTPExchange_get_response_http_version(server_exchange));
735     HTTPExchange_set_response_content_length(client_exchange, output_stream->length);
736    
737     /* send the instrumented code to the client */
738     if (HTTPExchange_write_response(client_exchange, output_stream->data, output_stream->length) != 0) {
739     HTTPServer_log_err("Warning: error writing to client\n");
740     }
741    
742     /* input_stream goes on the cache */
743     /*
744     Stream_delete(input_stream);
745     */
746     Stream_delete(output_stream);
747     add_cached_source(request_uri, input_stream);
748     }
749     else {
750     /* does not need instrumentation */
751    
752     /* send the headers to the client */
753     for (const HTTPHeader * h = HTTPExchange_get_response_headers(server_exchange); h != NULL; h = h->next) {
754     if (strcasecmp(h->name, HTTP_TRAILER) == 0 || strcasecmp(h->name, HTTP_TRANSFER_ENCODING) == 0) {
755     /* do nothing: we want to keep this header */
756     }
757     else if (is_hop_by_hop_header(h->name)) {
758     continue;
759     }
760     HTTPExchange_add_response_header(client_exchange, h->name, h->value);
761     }
762     add_via_header(HTTPExchange_get_response_message(client_exchange), HTTPExchange_get_response_http_version(server_exchange));
763    
764     if (HTTPExchange_write_response_headers(client_exchange) != 0) {
765     HTTPServer_log_err("Warning: error writing to client\n");
766     goto done;
767     }
768    
769     if (HTTPExchange_response_has_body(server_exchange)) {
770     /* read the body from the server and send it to the client */
771     HTTPMessage * client_response = HTTPExchange_get_response_message(client_exchange);
772     HTTPMessage * server_response = HTTPExchange_get_response_message(server_exchange);
773     if (copy_http_message_body(server_response, client_response) != 0) {
774     HTTPServer_log_err("Warning: error copying response body from server to client\n");
775     goto done;
776     }
777     }
778     }
779    
780     done:
781     if (server_exchange != NULL) {
782     HTTPExchange_delete(server_exchange);
783     }
784     if (server_connection != NULL) {
785     if (HTTPConnection_delete(server_connection) != 0) {
786     HTTPServer_log_err("Warning: error closing connection to server\n");
787     }
788     }
789     }
790    
791     static void handle_local_request(HTTPExchange * exchange) {
792     /* add the `Server' response-header (RFC 2616 14.38, 3.8) */
793     HTTPExchange_add_response_header(exchange, HTTP_SERVER, "jscoverage-server/" VERSION);
794    
795     char * filesystem_path = NULL;
796    
797     const char * abs_path = HTTPExchange_get_abs_path(exchange);
798     assert(*abs_path != '\0');
799    
800     if (str_starts_with(abs_path, "/jscoverage")) {
801     handle_jscoverage_request(exchange);
802     goto done;
803     }
804    
805     if (strstr(abs_path, "..") != NULL) {
806     send_response(exchange, 403, "Forbidden\n");
807     goto done;
808     }
809    
810     filesystem_path = make_path(document_root, abs_path + 1);
811    
812     struct stat buf;
813     if (stat(filesystem_path, &buf) == -1) {
814     send_response(exchange, 404, "Not found\n");
815     goto done;
816     }
817    
818     if (S_ISDIR(buf.st_mode)) {
819     if (filesystem_path[strlen(filesystem_path) - 1] != '/') {
820     const char * request_uri = HTTPExchange_get_request_uri(exchange);
821     char * uri = xmalloc(strlen(request_uri) + 2);
822     strcpy(uri, request_uri);
823     strcat(uri, "/");
824     HTTPExchange_add_response_header(exchange, "Location", uri);
825     free(uri);
826     send_response(exchange, 301, "Moved permanently\n");
827     goto done;
828     }
829    
830     DIR * d = opendir(filesystem_path);
831     if (d == NULL) {
832     send_response(exchange, 404, "Not found\n");
833     goto done;
834     }
835    
836     struct dirent * entry;
837     while ((entry = readdir(d)) != NULL) {
838     char * href = encode_uri_component(entry->d_name);
839     char * html_href = encode_html(href);
840     char * link = encode_html(entry->d_name);
841     char * directory_entry;
842     xasprintf(&directory_entry, "<a href=\"%s\">%s</a><br>\n", html_href, link);
843     if (HTTPExchange_write_response(exchange, directory_entry, strlen(directory_entry)) != 0) {
844     HTTPServer_log_err("Warning: error writing to client\n");
845     }
846     free(directory_entry);
847     free(href);
848     free(html_href);
849     free(link);
850     }
851     closedir(d);
852     }
853     else if (S_ISREG(buf.st_mode)) {
854     FILE * f = fopen(filesystem_path, "r");
855     if (f == NULL) {
856     send_response(exchange, 404, "Not found\n");
857     goto done;
858     }
859    
860     const char * content_type = get_content_type(filesystem_path);
861     HTTPExchange_set_response_header(exchange, HTTP_CONTENT_TYPE, content_type);
862     const char * request_uri = HTTPExchange_get_request_uri(exchange);
863     if (strcmp(content_type, "text/javascript") == 0 && ! is_no_instrument(request_uri)) {
864     Stream * input_stream = Stream_new(0);
865     Stream * output_stream = Stream_new(0);
866    
867     Stream_write_file_contents(input_stream, f);
868    
869     instrument_js(request_uri, input_stream, output_stream);
870    
871     if (HTTPExchange_write_response(exchange, output_stream->data, output_stream->length) != 0) {
872     HTTPServer_log_err("Warning: error writing to client\n");
873     }
874    
875     Stream_delete(input_stream);
876     Stream_delete(output_stream);
877     }
878     else {
879     char buffer[8192];
880     size_t bytes_read;
881     while ((bytes_read = fread(buffer, 1, 8192, f)) > 0) {
882     if (HTTPExchange_write_response(exchange, buffer, bytes_read) != 0) {
883     HTTPServer_log_err("Warning: error writing to client\n");
884     }
885     }
886     }
887     fclose(f);
888     }
889     else {
890     send_response(exchange, 404, "Not found\n");
891     goto done;
892     }
893    
894     done:
895     free(filesystem_path);
896     }
897    
898     static void handler(HTTPExchange * exchange) {
899     if (verbose) {
900     HTTPServer_log_out("%s", HTTPExchange_get_request_line(exchange));
901     }
902    
903     if (proxy) {
904     handle_proxy_request(exchange);
905     }
906     else {
907     handle_local_request(exchange);
908     }
909     }
910    
911     int main(int argc, char ** argv) {
912     program = "jscoverage-server";
913    
914     const char * ip_address = "127.0.0.1";
915     const char * port = "8080";
916     int shutdown = 0;
917    
918     no_instrument = xnew(const char *, argc - 1);
919    
920     for (int i = 1; i < argc; i++) {
921     if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
922     copy_resource_to_stream("jscoverage-server-help.txt", stdout);
923     exit(EXIT_SUCCESS);
924     }
925     else if (strcmp(argv[i], "-V") == 0 || strcmp(argv[i], "--version") == 0) {
926     printf("jscoverage-server %s\n", VERSION);
927     exit(EXIT_SUCCESS);
928     }
929     else if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
930     verbose = 1;
931     }
932    
933     else if (strcmp(argv[i], "--report-dir") == 0) {
934     i++;
935     if (i == argc) {
936     fatal("--report-dir: option requires an argument");
937     }
938     report_directory = argv[i];
939     }
940     else if (strncmp(argv[i], "--report-dir=", 13) == 0) {
941     report_directory = argv[i] + 13;
942     }
943    
944     else if (strcmp(argv[i], "--document-root") == 0) {
945     i++;
946     if (i == argc) {
947     fatal("--document-root: option requires an argument");
948     }
949     document_root = argv[i];
950     }
951     else if (strncmp(argv[i], "--document-root=", 16) == 0) {
952     document_root = argv[i] + 16;
953     }
954    
955     else if (strcmp(argv[i], "--ip-address") == 0) {
956     i++;
957     if (i == argc) {
958     fatal("--ip-address: option requires an argument");
959     }
960     ip_address = argv[i];
961     }
962     else if (strncmp(argv[i], "--ip-address=", 13) == 0) {
963     ip_address = argv[i] + 13;
964     }
965    
966     else if (strcmp(argv[i], "--no-instrument") == 0) {
967     i++;
968     if (i == argc) {
969     fatal("--no-instrument: option requires an argument");
970     }
971     no_instrument[num_no_instrument] = argv[i];
972     num_no_instrument++;
973     }
974     else if (strncmp(argv[i], "--no-instrument=", 16) == 0) {
975     no_instrument[num_no_instrument] = argv[i] + 16;
976     num_no_instrument++;
977     }
978    
979     else if (strcmp(argv[i], "--port") == 0) {
980     i++;
981     if (i == argc) {
982     fatal("--port: option requires an argument");
983     }
984     port = argv[i];
985     }
986     else if (strncmp(argv[i], "--port=", 7) == 0) {
987     port = argv[i] + 7;
988     }
989    
990     else if (strcmp(argv[i], "--proxy") == 0) {
991     proxy = 1;
992     }
993    
994     else if (strcmp(argv[i], "--shutdown") == 0) {
995     shutdown = 1;
996     }
997    
998     else if (strncmp(argv[i], "-", 1) == 0) {
999     fatal("unrecognized option `%s'", argv[i]);
1000     }
1001     else {
1002     fatal("too many arguments");
1003     }
1004     }
1005    
1006     /* check the port */
1007     char * end;
1008     unsigned long numeric_port = strtoul(port, &end, 10);
1009     if (*end != '\0') {
1010     fatal("--port: option must be an integer");
1011     }
1012     if (numeric_port > UINT16_MAX) {
1013     fatal("--port: option must be 16 bits");
1014     }
1015    
1016     /* is this a shutdown? */
1017     if (shutdown) {
1018     /* INADDR_LOOPBACK */
1019     HTTPConnection * connection = HTTPConnection_new_client("127.0.0.1", numeric_port);
1020     if (connection == NULL) {
1021     fatal("could not connect to server");
1022     }
1023     HTTPExchange * exchange = HTTPExchange_new(connection);
1024     HTTPExchange_set_method(exchange, "POST");
1025     HTTPExchange_set_request_uri(exchange, "/jscoverage-shutdown");
1026     if (HTTPExchange_write_request_headers(exchange) != 0) {
1027     fatal("could not write request headers to server");
1028     }
1029     if (HTTPExchange_read_response_headers(exchange) != 0) {
1030     fatal("could not read response headers from server");
1031     }
1032     Stream * stream = Stream_new(0);
1033     if (HTTPExchange_read_entire_response_entity_body(exchange, stream) != 0) {
1034     fatal("could not read response body from server");
1035     }
1036     fwrite(stream->data, 1, stream->length, stdout);
1037     Stream_delete(stream);
1038     HTTPExchange_delete(exchange);
1039     if (HTTPConnection_delete(connection) != 0) {
1040     fatal("could not close connection with server");
1041     }
1042     exit(EXIT_SUCCESS);
1043     }
1044    
1045     jscoverage_init();
1046    
1047     /* handle broken pipe */
1048     signal(SIGPIPE, SIG_IGN);
1049    
1050     if (verbose) {
1051     printf("Starting HTTP server on %s:%lu\n", ip_address, numeric_port);
1052     }
1053     HTTPServer_run(ip_address, (uint16_t) numeric_port, handler);
1054     if (verbose) {
1055     printf("Stopping HTTP server\n");
1056     }
1057    
1058     jscoverage_cleanup();
1059    
1060     free(no_instrument);
1061    
1062     pthread_mutex_lock(&source_cache_mutex);
1063     while (source_cache != NULL) {
1064     SourceCache * p = source_cache;
1065     source_cache = source_cache->next;
1066     free(p->url);
1067     Stream_delete(p->source);
1068     free(p);
1069     }
1070     pthread_mutex_unlock(&source_cache_mutex);
1071    
1072     return 0;
1073     }

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