1 /*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #if !defined(_GNU_SOURCE)
26 #define _GNU_SOURCE
27 #endif
28 #include "private-lib-core.h"
29
30 #include <pwd.h>
31 #include <grp.h>
32
33 #ifdef LWS_WITH_PLUGINS
34 #include <dlfcn.h>
35 #endif
36 #include <dirent.h>
37
lws_plat_apply_FD_CLOEXEC(int n)38 int lws_plat_apply_FD_CLOEXEC(int n)
39 {
40 if (n == -1)
41 return 0;
42
43 return fcntl(n, F_SETFD, FD_CLOEXEC);
44 }
45
46 int
lws_plat_write_file(const char * filename,void * buf,int len)47 lws_plat_write_file(const char *filename, void *buf, int len)
48 {
49 int m, fd;
50
51 fd = lws_open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
52
53 if (fd == -1)
54 return 1;
55
56 m = write(fd, buf, len);
57 close(fd);
58
59 return m != len;
60 }
61
62 int
lws_plat_read_file(const char * filename,void * buf,int len)63 lws_plat_read_file(const char *filename, void *buf, int len)
64 {
65 int n, fd = lws_open(filename, O_RDONLY);
66 if (fd == -1)
67 return -1;
68
69 n = read(fd, buf, len);
70 close(fd);
71
72 return n;
73 }
74
75 lws_fop_fd_t
_lws_plat_file_open(const struct lws_plat_file_ops * fops,const char * filename,const char * vpath,lws_fop_flags_t * flags)76 _lws_plat_file_open(const struct lws_plat_file_ops *fops, const char *filename,
77 const char *vpath, lws_fop_flags_t *flags)
78 {
79 struct stat stat_buf;
80 int ret = lws_open(filename, (*flags) & LWS_FOP_FLAGS_MASK, 0664);
81 lws_fop_fd_t fop_fd;
82
83 if (ret < 0)
84 return NULL;
85
86 if (fstat(ret, &stat_buf) < 0)
87 goto bail;
88
89 fop_fd = malloc(sizeof(*fop_fd));
90 if (!fop_fd)
91 goto bail;
92
93 fop_fd->fops = fops;
94 fop_fd->flags = *flags;
95 fop_fd->fd = ret;
96 fop_fd->filesystem_priv = NULL; /* we don't use it */
97 fop_fd->len = stat_buf.st_size;
98 fop_fd->pos = 0;
99
100 return fop_fd;
101
102 bail:
103 close(ret);
104 return NULL;
105 }
106
107 int
_lws_plat_file_close(lws_fop_fd_t * fop_fd)108 _lws_plat_file_close(lws_fop_fd_t *fop_fd)
109 {
110 int fd = (*fop_fd)->fd;
111
112 free(*fop_fd);
113 *fop_fd = NULL;
114
115 return close(fd);
116 }
117
118 lws_fileofs_t
_lws_plat_file_seek_cur(lws_fop_fd_t fop_fd,lws_fileofs_t offset)119 _lws_plat_file_seek_cur(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
120 {
121 lws_fileofs_t r;
122
123 if (offset > 0 &&
124 offset > (lws_fileofs_t)fop_fd->len - (lws_fileofs_t)fop_fd->pos)
125 offset = fop_fd->len - fop_fd->pos;
126
127 if ((lws_fileofs_t)fop_fd->pos + offset < 0)
128 offset = -fop_fd->pos;
129
130 r = lseek(fop_fd->fd, offset, SEEK_CUR);
131
132 if (r >= 0)
133 fop_fd->pos = r;
134 else
135 lwsl_err("error seeking from cur %ld, offset %ld\n",
136 (long)fop_fd->pos, (long)offset);
137
138 return r;
139 }
140
141 int
_lws_plat_file_read(lws_fop_fd_t fop_fd,lws_filepos_t * amount,uint8_t * buf,lws_filepos_t len)142 _lws_plat_file_read(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
143 uint8_t *buf, lws_filepos_t len)
144 {
145 long n;
146
147 n = read((int)fop_fd->fd, buf, len);
148 if (n == -1) {
149 *amount = 0;
150 return -1;
151 }
152 fop_fd->pos += n;
153 lwsl_debug("%s: read %ld of req %ld, pos %ld, len %ld\n", __func__, n,
154 (long)len, (long)fop_fd->pos, (long)fop_fd->len);
155 *amount = n;
156
157 return 0;
158 }
159
160 int
_lws_plat_file_write(lws_fop_fd_t fop_fd,lws_filepos_t * amount,uint8_t * buf,lws_filepos_t len)161 _lws_plat_file_write(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
162 uint8_t *buf, lws_filepos_t len)
163 {
164 long n;
165
166 n = write((int)fop_fd->fd, buf, len);
167 if (n == -1) {
168 *amount = 0;
169 return -1;
170 }
171
172 fop_fd->pos += n;
173 *amount = n;
174
175 return 0;
176 }
177
178