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
|
/* filter.c: filter framework functions
*
* Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
*
* Licensed under GNU General Public License v2
* (see COPYING for full license text)
*/
#include "cgit.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
static int open_exec_filter(struct cgit_filter *base, va_list ap)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
int i;
for (i = 0; i < filter->extra_args; i++)
filter->argv[i+1] = va_arg(ap, char *);
filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
"Unable to duplicate STDOUT");
chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
if (filter->pid == 0) {
close(filter->pipe_fh[1]);
chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
"Unable to use pipe as STDIN");
execvp(filter->cmd, filter->argv);
die_errno("Unable to exec subprocess %s", filter->cmd);
}
close(filter->pipe_fh[0]);
chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
"Unable to use pipe as STDOUT");
close(filter->pipe_fh[1]);
return 0;
}
static int close_exec_filter(struct cgit_filter *base)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
int i, exit_status;
chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
"Unable to restore STDOUT");
close(filter->old_stdout);
if (filter->pid < 0)
goto done;
waitpid(filter->pid, &exit_status, 0);
if (WIFEXITED(exit_status) && !WEXITSTATUS(exit_status))
goto done;
die("Subprocess %s exited abnormally", filter->cmd);
done:
for (i = 0; i < filter->extra_args; i++)
filter->argv[i+1] = NULL;
return 0;
}
static void fprintf_exec_filter(struct cgit_filter *base, FILE *f, const char *prefix)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
fprintf(f, "%sexec:%s\n", prefix, filter->cmd);
}
int cgit_open_filter(struct cgit_filter *filter, ...)
{
int result;
va_list ap;
va_start(ap, filter);
result = filter->open(filter, ap);
va_end(ap);
return result;
}
int cgit_close_filter(struct cgit_filter *filter)
{
return filter->close(filter);
}
void cgit_fprintf_filter(struct cgit_filter *filter, FILE *f, const char *prefix)
{
filter->fprintf(filter, f, prefix);
}
void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **argv)
{
memset(filter, 0, sizeof(*filter));
filter->base.open = open_exec_filter;
filter->base.close = close_exec_filter;
filter->base.fprintf = fprintf_exec_filter;
filter->cmd = cmd;
filter->argv = argv;
}
static struct cgit_filter *new_exec_filter(const char *cmd, filter_type filtertype)
{
struct cgit_exec_filter *f;
int args_size = 0;
f = xmalloc(sizeof(*f));
/* We leave argv for now and assign it below. */
cgit_exec_filter_init(f, xstrdup(cmd), NULL);
switch (filtertype) {
case SOURCE:
case ABOUT:
f->extra_args = 1;
break;
case COMMIT:
default:
f->extra_args = 0;
break;
}
args_size = (2 + f->extra_args) * sizeof(char *);
f->argv = xmalloc(args_size);
memset(f->argv, 0, args_size);
f->argv[0] = f->cmd;
return &f->base;
}
static const struct {
const char *prefix;
struct cgit_filter *(*ctor)(const char *cmd, filter_type filtertype);
} filter_specs[] = {
{ "exec", new_exec_filter },
};
struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
{
char *colon;
int i;
size_t len;
if (!cmd || !cmd[0])
return NULL;
colon = strchr(cmd, ':');
len = colon - cmd;
/*
* In case we're running on Windows, don't allow a single letter before
* the colon.
*/
if (len == 1)
colon = NULL;
/* If no prefix is given, exec filter is the default. */
if (!colon)
return new_exec_filter(cmd, filtertype);
for (i = 0; i < ARRAY_SIZE(filter_specs); i++) {
if (len == strlen(filter_specs[i].prefix) &&
!strncmp(filter_specs[i].prefix, cmd, len))
return filter_specs[i].ctor(colon + 1, filtertype);
}
die("Invalid filter type: %.*s", (int) len, cmd);
}
|
