| rev |
line source |
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nuclear@12
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1 /* tinyweb - tiny web server library and daemon
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nuclear@12
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2 * Author: John Tsiombikas <nuclear@member.fsf.org>
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nuclear@12
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3 *
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nuclear@12
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4 * This program is placed in the public domain. Feel free to use it any
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nuclear@12
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5 * way you like. Mentions and retaining this attribution header will be
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nuclear@12
|
6 * appreciated, but not required.
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nuclear@12
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7 */
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nuclear@7
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8 #include <stdio.h>
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nuclear@7
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9 #include <stdlib.h>
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nuclear@7
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10 #include <string.h>
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nuclear@7
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11 #include <ctype.h>
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nuclear@7
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12 #include <errno.h>
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nuclear@7
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13 #include <unistd.h>
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nuclear@7
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14 #include <fcntl.h>
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nuclear@16
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15 #include <dirent.h>
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nuclear@7
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16 #include <sys/stat.h>
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nuclear@7
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17 #include <sys/select.h>
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nuclear@7
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18 #include <sys/mman.h>
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nuclear@7
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19 #include <sys/types.h>
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nuclear@7
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20 #include <sys/socket.h>
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nuclear@7
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21 #include <arpa/inet.h>
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nuclear@7
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22 #include "tinyweb.h"
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nuclear@7
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23 #include "http.h"
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nuclear@7
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24 #include "mime.h"
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nuclear@7
|
25 #include "logger.h"
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nuclear@7
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26
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nuclear@7
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27 /* HTTP version */
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nuclear@7
|
28 #define HTTP_VER_MAJOR 1
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nuclear@7
|
29 #define HTTP_VER_MINOR 1
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nuclear@7
|
30 #define HTTP_VER_STR "1.1"
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nuclear@7
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31
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nuclear@7
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32 /* maximum request length: 64mb */
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nuclear@7
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33 #define MAX_REQ_LENGTH (65536 * 1024)
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nuclear@7
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34
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nuclear@7
|
35 struct client {
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nuclear@7
|
36 int s;
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nuclear@7
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37 char *rcvbuf;
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|
nuclear@7
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38 int bufsz;
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nuclear@7
|
39 struct client *next;
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nuclear@7
|
40 };
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|
nuclear@7
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41
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|
nuclear@7
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42 static int accept_conn(int lis);
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nuclear@7
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43 static void close_conn(struct client *c);
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nuclear@7
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44 static int handle_client(struct client *c);
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nuclear@7
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45 static int do_get(struct client *c, const char *uri, int with_body);
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nuclear@16
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46 static int do_get_index(struct client *c, const char *path, int with_body);
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nuclear@7
|
47 static void respond_error(struct client *c, int errcode);
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nuclear@7
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48
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nuclear@7
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49 static int lis = -1;
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nuclear@7
|
50 static int maxfd;
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nuclear@7
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51 static int port = 8080;
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nuclear@7
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52 static struct client *clist;
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nuclear@7
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53 static int num_clients;
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nuclear@7
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54
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nuclear@7
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55 static const char *indexfiles[] = {
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nuclear@7
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56 "index.cgi",
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nuclear@7
|
57 "index.html",
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nuclear@7
|
58 "index.htm",
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nuclear@7
|
59 0
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nuclear@7
|
60 };
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nuclear@7
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61
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nuclear@7
|
62 void tw_set_port(int p)
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nuclear@7
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63 {
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nuclear@7
|
64 port = p;
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nuclear@7
|
65 }
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|
nuclear@7
|
66
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|
nuclear@7
|
67 int tw_set_root(const char *path)
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|
nuclear@7
|
68 {
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|
nuclear@7
|
69 return chdir(path);
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nuclear@7
|
70 }
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|
nuclear@7
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71
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nuclear@7
|
72 int tw_set_logfile(const char *fname)
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nuclear@7
|
73 {
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nuclear@7
|
74 return set_log_file(fname);
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|
nuclear@7
|
75 }
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nuclear@7
|
76
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|
nuclear@7
|
77 int tw_start(void)
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|
nuclear@7
|
78 {
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|
nuclear@7
|
79 int s;
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nuclear@7
|
80 struct sockaddr_in sa;
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nuclear@7
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81
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nuclear@7
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82 logmsg("starting server ...\n");
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nuclear@7
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83
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nuclear@7
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84 if(lis != -1) {
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nuclear@7
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85 logmsg("can't start tinyweb server: already running!\n");
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nuclear@7
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86 return -1;
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nuclear@7
|
87 }
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nuclear@7
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88
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nuclear@7
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89 if((s = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
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nuclear@7
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90 logmsg("failed to create listening socket: %s\n", strerror(errno));
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|
nuclear@7
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91 return -1;
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|
nuclear@7
|
92 }
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nuclear@7
|
93 fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);
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nuclear@7
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94
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nuclear@7
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95 memset(&sa, 0, sizeof sa);
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nuclear@7
|
96 sa.sin_family = AF_INET;
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nuclear@7
|
97 sa.sin_addr.s_addr = INADDR_ANY;
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|
nuclear@7
|
98 sa.sin_port = htons(port);
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|
nuclear@7
|
99
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nuclear@7
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100 if(bind(s, (struct sockaddr*)&sa, sizeof sa) == -1) {
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nuclear@7
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101 logmsg("failed to bind socket to port %d: %s\n", port, strerror(errno));
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nuclear@7
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102 return -1;
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nuclear@7
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103 }
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nuclear@7
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104 listen(s, 16);
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nuclear@7
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105
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nuclear@7
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106 lis = s;
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nuclear@7
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107 return s;
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nuclear@7
|
108 }
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nuclear@7
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109
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nuclear@7
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110 int tw_stop(void)
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nuclear@7
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111 {
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nuclear@7
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112 if(lis == -1) {
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nuclear@7
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113 return -1;
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nuclear@7
|
114 }
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nuclear@7
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115
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nuclear@7
|
116 logmsg("stopping server...\n");
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nuclear@7
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117
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nuclear@7
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118 close(lis);
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nuclear@7
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119 lis = -1;
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nuclear@7
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120
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nuclear@7
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121 while(clist) {
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nuclear@7
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122 struct client *c = clist;
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nuclear@7
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123 clist = clist->next;
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nuclear@7
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124 close_conn(c);
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nuclear@7
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125 free(c);
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|
nuclear@7
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126 }
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nuclear@7
|
127 clist = 0;
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nuclear@7
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128
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nuclear@7
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129 return 0;
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|
nuclear@7
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130 }
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|
nuclear@7
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131
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nuclear@7
|
132 int tw_get_sockets(int *socks)
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|
nuclear@7
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133 {
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|
nuclear@7
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134 struct client *c, dummy;
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|
nuclear@7
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135
|
|
nuclear@7
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136 /* first cleanup the clients marked for removal */
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nuclear@7
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137 dummy.next = clist;
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|
nuclear@7
|
138 c = &dummy;
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|
nuclear@7
|
139
|
|
nuclear@7
|
140 while(c->next) {
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|
nuclear@7
|
141 struct client *n = c->next;
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|
nuclear@7
|
142
|
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nuclear@7
|
143 if(n->s == -1) {
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nuclear@7
|
144 /* marked for removal */
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nuclear@7
|
145 c->next = n->next;
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|
nuclear@7
|
146 free(n);
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|
nuclear@7
|
147 --num_clients;
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nuclear@7
|
148 } else {
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|
nuclear@7
|
149 c = c->next;
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|
nuclear@7
|
150 }
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|
nuclear@7
|
151 }
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nuclear@7
|
152 clist = dummy.next;
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|
nuclear@7
|
153
|
|
nuclear@8
|
154
|
|
nuclear@8
|
155 if(!socks) {
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nuclear@8
|
156 /* just return the count */
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nuclear@8
|
157 return num_clients + 1; /* +1 for the listening socket */
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|
nuclear@8
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158 }
|
|
nuclear@8
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159
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nuclear@7
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160 /* go through the client list and populate the array */
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nuclear@7
|
161 maxfd = lis;
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|
nuclear@7
|
162 *socks++ = lis;
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|
nuclear@7
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163
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nuclear@7
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164 c = clist;
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nuclear@7
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165 while(c) {
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nuclear@7
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166 *socks++ = c->s;
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nuclear@7
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167 if(c->s > maxfd) {
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nuclear@7
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168 maxfd = c->s;
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nuclear@7
|
169 }
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nuclear@7
|
170 c = c->next;
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nuclear@7
|
171 }
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nuclear@7
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172 return num_clients + 1; /* +1 for the listening socket */
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nuclear@7
|
173 }
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|
nuclear@7
|
174
|
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nuclear@7
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175 int tw_get_maxfd(void)
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nuclear@7
|
176 {
|
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nuclear@7
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177 return maxfd;
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nuclear@7
|
178 }
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nuclear@7
|
179
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nuclear@7
|
180 int tw_handle_socket(int s)
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nuclear@7
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181 {
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nuclear@7
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182 struct client *c;
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nuclear@7
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183
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nuclear@7
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184 if(s == lis) {
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nuclear@7
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185 return accept_conn(s);
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nuclear@7
|
186 }
|
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nuclear@7
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187
|
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nuclear@7
|
188 /* find which client corresponds to this socket */
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nuclear@7
|
189 c = clist;
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nuclear@7
|
190 while(c) {
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nuclear@7
|
191 if(c->s == s) {
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nuclear@7
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192 return handle_client(c);
|
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nuclear@7
|
193 }
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nuclear@7
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194 c = c->next;
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nuclear@7
|
195 }
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nuclear@7
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196
|
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nuclear@7
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197 logmsg("socket %d doesn't correspond to any client\n");
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nuclear@7
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198 return -1;
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nuclear@7
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199 }
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nuclear@7
|
200
|
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nuclear@7
|
201 static int accept_conn(int lis)
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nuclear@7
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202 {
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nuclear@7
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203 int s;
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nuclear@7
|
204 struct client *c;
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|
nuclear@7
|
205 struct sockaddr_in addr;
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nuclear@7
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206 socklen_t addr_sz = sizeof addr;
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|
nuclear@7
|
207
|
|
nuclear@7
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208 if((s = accept(lis, (struct sockaddr*)&addr, &addr_sz)) == -1) {
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|
nuclear@7
|
209 logmsg("failed to accept incoming connection: %s\n", strerror(errno));
|
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nuclear@7
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210 return -1;
|
|
nuclear@7
|
211 }
|
|
nuclear@7
|
212 fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);
|
|
nuclear@7
|
213
|
|
nuclear@7
|
214 if(!(c = malloc(sizeof *c))) {
|
|
nuclear@7
|
215 logmsg("failed to allocate memory while accepting connection: %s\n", strerror(errno));
|
|
nuclear@7
|
216 return -1;
|
|
nuclear@7
|
217 }
|
|
nuclear@7
|
218 c->s = s;
|
|
nuclear@7
|
219 c->rcvbuf = 0;
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|
nuclear@7
|
220 c->bufsz = 0;
|
|
nuclear@7
|
221 c->next = clist;
|
|
nuclear@7
|
222 clist = c;
|
|
nuclear@8
|
223 ++num_clients;
|
|
nuclear@7
|
224 return 0;
|
|
nuclear@7
|
225 }
|
|
nuclear@7
|
226
|
|
nuclear@7
|
227 static void close_conn(struct client *c)
|
|
nuclear@7
|
228 {
|
|
nuclear@7
|
229 close(c->s);
|
|
nuclear@7
|
230 c->s = -1; /* mark it for removal */
|
|
nuclear@7
|
231 free(c->rcvbuf);
|
|
nuclear@7
|
232 c->rcvbuf = 0;
|
|
nuclear@7
|
233 }
|
|
nuclear@7
|
234
|
|
nuclear@7
|
235 static int handle_client(struct client *c)
|
|
nuclear@7
|
236 {
|
|
nuclear@7
|
237 struct http_req_header hdr;
|
|
nuclear@7
|
238 static char buf[2048];
|
|
nuclear@7
|
239 int rdsz, status;
|
|
nuclear@7
|
240
|
|
nuclear@7
|
241 while((rdsz = recv(c->s, buf, sizeof buf, 0)) > 0) {
|
|
nuclear@7
|
242 char *newbuf;
|
|
nuclear@7
|
243 int newsz = c->bufsz + rdsz;
|
|
nuclear@7
|
244 if(newsz > MAX_REQ_LENGTH) {
|
|
nuclear@7
|
245 respond_error(c, 413);
|
|
nuclear@7
|
246 return -1;
|
|
nuclear@7
|
247 }
|
|
nuclear@7
|
248
|
|
nuclear@7
|
249 if(!(newbuf = realloc(c->rcvbuf, newsz + 1))) {
|
|
nuclear@7
|
250 logmsg("failed to allocate %d byte buffer\n", newsz);
|
|
nuclear@7
|
251 respond_error(c, 503);
|
|
nuclear@7
|
252 return -1;
|
|
nuclear@7
|
253 }
|
|
nuclear@7
|
254
|
|
nuclear@7
|
255 memcpy(newbuf + c->bufsz, buf, rdsz);
|
|
nuclear@7
|
256 newbuf[newsz] = 0;
|
|
nuclear@7
|
257
|
|
nuclear@7
|
258 c->rcvbuf = newbuf;
|
|
nuclear@7
|
259 c->bufsz = newsz;
|
|
nuclear@7
|
260 }
|
|
nuclear@7
|
261
|
|
nuclear@7
|
262 if((status = http_parse_request(&hdr, c->rcvbuf, c->bufsz)) != HTTP_HDR_OK) {
|
|
nuclear@7
|
263 http_log_request(&hdr);
|
|
nuclear@7
|
264 switch(status) {
|
|
nuclear@7
|
265 case HTTP_HDR_INVALID:
|
|
nuclear@7
|
266 respond_error(c, 400);
|
|
nuclear@7
|
267 return -1;
|
|
nuclear@7
|
268
|
|
nuclear@7
|
269 case HTTP_HDR_NOMEM:
|
|
nuclear@7
|
270 respond_error(c, 503);
|
|
nuclear@7
|
271 return -1;
|
|
nuclear@7
|
272
|
|
nuclear@7
|
273 case HTTP_HDR_PARTIAL:
|
|
nuclear@7
|
274 return 0; /* partial header, continue reading */
|
|
nuclear@7
|
275 }
|
|
nuclear@7
|
276 }
|
|
nuclear@7
|
277 http_log_request(&hdr);
|
|
nuclear@7
|
278
|
|
nuclear@7
|
279 /* we only support GET and HEAD at this point, so freak out on anything else */
|
|
nuclear@7
|
280 switch(hdr.method) {
|
|
nuclear@7
|
281 case HTTP_GET:
|
|
nuclear@7
|
282 if(do_get(c, hdr.uri, 1) == -1) {
|
|
nuclear@7
|
283 return -1;
|
|
nuclear@7
|
284 }
|
|
nuclear@7
|
285 break;
|
|
nuclear@7
|
286
|
|
nuclear@7
|
287 case HTTP_HEAD:
|
|
nuclear@7
|
288 if(do_get(c, hdr.uri, 0) == -1) {
|
|
nuclear@7
|
289 return -1;
|
|
nuclear@7
|
290 }
|
|
nuclear@7
|
291 break;
|
|
nuclear@7
|
292
|
|
nuclear@7
|
293 default:
|
|
nuclear@7
|
294 respond_error(c, 501);
|
|
nuclear@7
|
295 return -1;
|
|
nuclear@7
|
296 }
|
|
nuclear@7
|
297
|
|
nuclear@7
|
298 close_conn(c);
|
|
nuclear@7
|
299 return 0;
|
|
nuclear@7
|
300 }
|
|
nuclear@7
|
301
|
|
nuclear@7
|
302 static int do_get(struct client *c, const char *uri, int with_body)
|
|
nuclear@7
|
303 {
|
|
nuclear@7
|
304 const char *ptr;
|
|
nuclear@7
|
305 struct http_resp_header resp;
|
|
nuclear@7
|
306
|
|
nuclear@7
|
307 if((ptr = strstr(uri, "://"))) {
|
|
nuclear@7
|
308 uri = ptr + 3;
|
|
nuclear@7
|
309 }
|
|
nuclear@7
|
310
|
|
nuclear@7
|
311 /* skip the host part and the first slash if it exists */
|
|
nuclear@7
|
312 if((ptr = strchr(uri, '/'))) {
|
|
nuclear@7
|
313 uri = ptr + 1;
|
|
nuclear@7
|
314 }
|
|
nuclear@7
|
315
|
|
nuclear@7
|
316 if(*uri) {
|
|
nuclear@7
|
317 struct stat st;
|
|
nuclear@7
|
318 char *path = 0;
|
|
nuclear@7
|
319 char *rsphdr;
|
|
nuclear@7
|
320 const char *type;
|
|
nuclear@7
|
321 int fd, rspsize;
|
|
nuclear@7
|
322
|
|
nuclear@7
|
323 if(stat(uri, &st) == -1) {
|
|
nuclear@7
|
324 respond_error(c, 404);
|
|
nuclear@7
|
325 return -1;
|
|
nuclear@7
|
326 }
|
|
nuclear@7
|
327
|
|
nuclear@7
|
328 if(S_ISDIR(st.st_mode)) {
|
|
nuclear@7
|
329 int i;
|
|
nuclear@7
|
330 path = alloca(strlen(uri) + 64);
|
|
nuclear@7
|
331
|
|
nuclear@7
|
332 for(i=0; indexfiles[i]; i++) {
|
|
nuclear@7
|
333 sprintf(path, "%s/%s", uri, indexfiles[i]);
|
|
nuclear@7
|
334 if(stat(path, &st) == 0 && !S_ISDIR(st.st_mode)) {
|
|
nuclear@16
|
335 /* found an index file */
|
|
nuclear@7
|
336 break;
|
|
nuclear@7
|
337 }
|
|
nuclear@7
|
338 }
|
|
nuclear@7
|
339
|
|
nuclear@7
|
340 if(indexfiles[i] == 0) {
|
|
nuclear@16
|
341 return do_get_index(c, uri, with_body);
|
|
nuclear@7
|
342 }
|
|
nuclear@7
|
343 } else {
|
|
nuclear@7
|
344 path = (char*)uri;
|
|
nuclear@7
|
345 }
|
|
nuclear@7
|
346
|
|
nuclear@7
|
347 if((fd = open(path, O_RDONLY)) == -1) {
|
|
nuclear@7
|
348 respond_error(c, 403);
|
|
nuclear@7
|
349 return -1;
|
|
nuclear@7
|
350 }
|
|
nuclear@7
|
351
|
|
nuclear@7
|
352 /* construct response header */
|
|
nuclear@7
|
353 http_init_resp(&resp);
|
|
nuclear@7
|
354 http_add_resp_field(&resp, "Content-Length: %d", st.st_size);
|
|
nuclear@7
|
355 if((type = mime_type(path))) {
|
|
nuclear@7
|
356 http_add_resp_field(&resp, "Content-Type: %s", type);
|
|
nuclear@7
|
357 }
|
|
nuclear@7
|
358
|
|
nuclear@7
|
359 rspsize = http_serialize_resp(&resp, 0);
|
|
nuclear@7
|
360 rsphdr = alloca(rspsize);
|
|
nuclear@7
|
361 http_serialize_resp(&resp, rsphdr);
|
|
nuclear@7
|
362
|
|
nuclear@7
|
363 if(with_body) {
|
|
nuclear@7
|
364 int cont_left = st.st_size;
|
|
nuclear@7
|
365 char *cont = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
nuclear@7
|
366 if(cont == (void*)-1) {
|
|
nuclear@7
|
367 respond_error(c, 503);
|
|
nuclear@7
|
368 close(fd);
|
|
nuclear@7
|
369 return -1;
|
|
nuclear@7
|
370 }
|
|
nuclear@7
|
371 ptr = cont;
|
|
nuclear@7
|
372
|
|
nuclear@16
|
373 logmsg("GET %s OK! (%s)\n", uri, path);
|
|
nuclear@16
|
374
|
|
nuclear@7
|
375 send(c->s, rsphdr, rspsize, 0);
|
|
nuclear@7
|
376 while(cont_left > 0) {
|
|
nuclear@7
|
377 int sz = cont_left < 4096 ? cont_left : 4096;
|
|
nuclear@7
|
378 send(c->s, ptr, sz, 0);
|
|
nuclear@7
|
379 ptr += sz;
|
|
nuclear@8
|
380 cont_left -= sz;
|
|
nuclear@7
|
381 }
|
|
nuclear@7
|
382
|
|
nuclear@7
|
383 munmap(cont, st.st_size);
|
|
nuclear@7
|
384 } else {
|
|
nuclear@16
|
385 logmsg("HEAD %s OK! (%s)\n", uri, path);
|
|
nuclear@7
|
386 send(c->s, rsphdr, rspsize, 0);
|
|
nuclear@7
|
387 }
|
|
nuclear@7
|
388
|
|
nuclear@7
|
389 close(fd);
|
|
nuclear@7
|
390 }
|
|
nuclear@7
|
391 return 0;
|
|
nuclear@7
|
392 }
|
|
nuclear@7
|
393
|
|
nuclear@16
|
394 static void filesizestr(char *str, unsigned long sz)
|
|
nuclear@16
|
395 {
|
|
nuclear@16
|
396 int uidx = 0;
|
|
nuclear@16
|
397 static const char *unit[] = {"bytes", "kb", "mb", "gb", "tb", 0};
|
|
nuclear@16
|
398
|
|
nuclear@16
|
399 while(sz > 1024 && unit[uidx + 1]) {
|
|
nuclear@16
|
400 sz /= 1024;
|
|
nuclear@16
|
401 ++uidx;
|
|
nuclear@16
|
402 }
|
|
nuclear@16
|
403 sprintf(str, "%lu %s", sz, unit[uidx]);
|
|
nuclear@16
|
404 }
|
|
nuclear@16
|
405
|
|
nuclear@16
|
406 struct dir_entry {
|
|
nuclear@16
|
407 char *name;
|
|
nuclear@16
|
408 unsigned long size;
|
|
nuclear@16
|
409 int is_dir;
|
|
nuclear@16
|
410 struct dir_entry *next;
|
|
nuclear@16
|
411 };
|
|
nuclear@16
|
412
|
|
nuclear@16
|
413 /* precondition: path is a directory */
|
|
nuclear@16
|
414 static int do_get_index(struct client *c, const char *path, int with_body)
|
|
nuclear@16
|
415 {
|
|
nuclear@16
|
416 }
|
|
nuclear@16
|
417
|
|
nuclear@16
|
418 static const char *error_page_fmt =
|
|
nuclear@16
|
419 "<html>"
|
|
nuclear@16
|
420 "<head><title>Error %d</title></head>\n"
|
|
nuclear@16
|
421 "<body><h1>HTTP Error %d</h1><p>%s</p></body>"
|
|
nuclear@16
|
422 "</html>";
|
|
nuclear@16
|
423
|
|
nuclear@7
|
424 static void respond_error(struct client *c, int errcode)
|
|
nuclear@7
|
425 {
|
|
nuclear@7
|
426 char buf[512];
|
|
nuclear@7
|
427
|
|
nuclear@7
|
428 sprintf(buf, "HTTP/" HTTP_VER_STR " %d %s\r\n\r\n", errcode, http_strmsg(errcode));
|
|
nuclear@16
|
429 logmsg("error %d: %s\n", errcode, http_strmsg(errcode));
|
|
nuclear@7
|
430
|
|
nuclear@7
|
431 send(c->s, buf, strlen(buf), 0);
|
|
nuclear@16
|
432
|
|
nuclear@16
|
433 sprintf(buf, error_page_fmt, errcode, errcode, http_strmsg(errcode));
|
|
nuclear@16
|
434 send(c->s, buf, strlen(buf), 0);
|
|
nuclear@7
|
435 close_conn(c);
|
|
nuclear@7
|
436 }
|
|
nuclear@7
|
437
|
