1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* simple and trivial SCGI server with hard-coded results for use in unit tests
* - listens on STDIN_FILENO (socket on STDIN_FILENO must be set up by caller)
* - processes a single SCGI request at a time
* - arbitrary limitation: reads request headers netstring up to 64k in size
* - expect recv data for request headers netstring every 10ms or less
* - no read timeouts for request body; might block reading request body
* - no write timeouts; might block writing response
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <poll.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#ifndef MSG_DONTWAIT
#define MSG_DONTWAIT 0
#endif
static int finished;
static char buf[65536];
static char *
scgi_getenv(char *r, const unsigned long rlen, const char * const name)
{
/* simple search;
* if many lookups are done, then should use more efficient data structure*/
char * const end = r+rlen;
char *z;
const size_t len = strlen(name);
do {
if (0 == strcmp(r, name)) return r+len+1;
z = memchr(r, '\0', (size_t)(end-r));
if (NULL == z) return NULL;
z = memchr(z+1, '\0', (size_t)(end-r));
if (NULL == z) return NULL;
r = z+1;
} while (r < end);
return NULL;
}
static void
scgi_process (const int fd)
{
ssize_t rd = 0, offset = 0;
int num_requests = 1;
char *p = NULL, *r;
unsigned long rlen;
long long cl;
assert(fd == STDOUT_FILENO); /*(required for response sent with printf())*/
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
do {
struct pollfd pfd = { fd, POLLIN, 0 };
switch (poll(&pfd, 1, 10)) { /* 10ms timeout */
default: /* 1; the only pfd has revents */
break;
case -1: /* error */
case 0: /* timeout */
pfd.revents |= POLLERR;
break;
}
if (!(pfd.revents & POLLIN))
break;
do {
rd = recv(fd, buf+offset, sizeof(buf)-offset, MSG_DONTWAIT);
} while (rd < 0 && errno == EINTR);
if (rd > 0)
offset += rd;
else if (0 == rd) {
p = memchr(buf, ':', offset);
break;
}
else if (errno == EAGAIN || errno == EWOULDBLOCK)
continue;
else
break;
} while (NULL == (p = memchr(buf,':',offset)) && offset < 21);
if (NULL == p)
return; /* timeout or error receiving start of netstring */
rlen = strtoul(buf, &p, 10);
if (*buf == '-' || *p != ':' || p == buf || rlen == ULONG_MAX)
return; /* invalid netstring (and rlen == ULONG_MAX is too long)*/
if (rlen > sizeof(buf) - (p - buf) - 2)
return; /* netstring longer than arbitrary limit we accept here */
rlen += (p - buf) + 2;
while ((ssize_t)rlen < offset) {
struct pollfd pfd = { fd, POLLIN, 0 };
switch (poll(&pfd, 1, 10)) { /* 10ms timeout */
default: /* 1; the only pfd has revents */
break;
case -1: /* error */
case 0: /* timeout */
pfd.revents |= POLLERR;
break;
}
if (!(pfd.revents & POLLIN))
break;
do {
rd = recv(fd, buf+offset, sizeof(buf)-offset, MSG_DONTWAIT);
} while (rd < 0 && errno == EINTR);
if (rd > 0)
offset += rd;
else if (0 == rd)
break;
else if (errno == EAGAIN || errno == EWOULDBLOCK)
continue;
else
break;
}
if (offset < (ssize_t)rlen)
return; /* timeout or error receiving netstring */
if (buf[rlen-1] != ',')
return; /* invalid netstring */
rlen -= (p - buf) + 2;
r = p+1;
/* not checking for empty headers in SCGI request (empty values allowed) */
/* SCGI request must contain "SCGI" header with value "1" */
p = scgi_getenv(r, rlen, "SCGI");
if (NULL == p || p[0] != '1' || p[1] != '\0')
return; /* missing or invalid SCGI header */
/* CONTENT_LENGTH must be first header in SCGI request; always required */
if (0 != strcmp(r, "CONTENT_LENGTH"))
return; /* missing CONTENT_LENGTH */
errno = 0;
cl = strtoll(r+sizeof("CONTENT_LENGTH"), &p, 10);
if (*p != '\0' || p == r+sizeof("CONTENT_LENGTH") || cl < 0 || 0 != errno)
return; /* invalid CONTENT_LENGTH */
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NONBLOCK);
/* read,discard request body (currently ignored in these SCGI unit tests)
* (make basic effort to read body; ignore any timeouts or errors here) */
cl -= (offset - (r+rlen+1 - buf));
while (cl > 0) {
char x[8192];
do {
rd = recv(fd, x, (cl>(long long)sizeof(x)?sizeof(x):(size_t)cl), 0);
} while (rd < 0 && errno == EINTR);
if (rd <= 0)
break;
cl -= rd;
}
/*(from fcgi-responder.c, substituting scgi_getenv() for getenv())*/
{
if (NULL != (p = scgi_getenv(r, rlen, "QUERY_STRING"))) {
if (0 == strcmp(p, "lf")) {
printf("Status: 200 OK\n\n");
} else if (0 == strcmp(p, "crlf")) {
printf("Status: 200 OK\r\n\r\n");
} else if (0 == strcmp(p, "slow-lf")) {
printf("Status: 200 OK\n");
fflush(stdout);
printf("\n");
} else if (0 == strcmp(p,"slow-crlf")) {
printf("Status: 200 OK\r\n");
fflush(stdout);
printf("\r\n");
} else if (0 == strcmp(p, "die-at-end")) {
printf("Status: 200 OK\r\n\r\n");
num_requests--;
} else {
printf("Status: 200 OK\r\n\r\n");
}
} else {
printf("Status: 500 Internal Foo\r\n\r\n");
}
if (0 == strcmp(p, "path_info")) {
printf("%s", scgi_getenv(r, rlen, "PATH_INFO"));
} else if (0 == strcmp(p, "script_name")) {
printf("%s", scgi_getenv(r, rlen, "SCRIPT_NAME"));
} else if (0 == strcmp(p, "var")) {
p = scgi_getenv(r, rlen, "X_LIGHTTPD_FCGI_AUTH");
printf("%s", p ? p : "(no value)");
} else {
printf("test123");
}
}
fflush(stdout);
if (0 == num_requests) finished = 1;
}
int
main (void)
{
int fd;
fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL) & ~O_NONBLOCK);
close(STDOUT_FILENO); /*(so that accept() returns fd to STDOUT_FILENO)*/
do {
fd = accept(STDIN_FILENO, NULL, NULL);
if (fd < 0)
continue;
assert(fd == STDOUT_FILENO);
scgi_process(fd);
} while (fd > 0 ? 0 == close(fd) && !finished : errno == EINTR);
return 0;
}
|
