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,size_t len)47 lws_plat_write_file(const char *filename, void *buf, size_t len)
48 {
49 ssize_t m;
50 int fd;
51
52 fd = lws_open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
53
54 if (fd == -1)
55 return 1;
56
57 m = write(fd, buf, len);
58 close(fd);
59
60 if (m < 0)
61 return 1;
62
63 return (size_t)m != len;
64 }
65
66 int
lws_plat_read_file(const char * filename,void * buf,size_t len)67 lws_plat_read_file(const char *filename, void *buf, size_t len)
68 {
69 int fd = lws_open(filename, O_RDONLY);
70 ssize_t n;
71
72 if (fd == -1)
73 return -1;
74
75 n = read(fd, buf, len);
76 close(fd);
77
78 return (int)n;
79 }
80
81 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)82 _lws_plat_file_open(const struct lws_plat_file_ops *fops, const char *filename,
83 const char *vpath, lws_fop_flags_t *flags)
84 {
85 struct stat stat_buf;
86 int ret = lws_open(filename, (*flags) & LWS_FOP_FLAGS_MASK, 0664);
87 lws_fop_fd_t fop_fd;
88
89 if (ret < 0)
90 return NULL;
91
92 if (fstat(ret, &stat_buf) < 0)
93 goto bail;
94
95 fop_fd = malloc(sizeof(*fop_fd));
96 if (!fop_fd)
97 goto bail;
98
99 fop_fd->fops = fops;
100 fop_fd->flags = *flags;
101 fop_fd->fd = ret;
102 fop_fd->filesystem_priv = NULL; /* we don't use it */
103 fop_fd->len = (lws_filepos_t)stat_buf.st_size;
104 fop_fd->pos = 0;
105
106 return fop_fd;
107
108 bail:
109 close(ret);
110 return NULL;
111 }
112
113 int
_lws_plat_file_close(lws_fop_fd_t * fop_fd)114 _lws_plat_file_close(lws_fop_fd_t *fop_fd)
115 {
116 int fd = (*fop_fd)->fd;
117
118 free(*fop_fd);
119 *fop_fd = NULL;
120
121 return close(fd);
122 }
123
124 lws_fileofs_t
_lws_plat_file_seek_cur(lws_fop_fd_t fop_fd,lws_fileofs_t offset)125 _lws_plat_file_seek_cur(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
126 {
127 lws_fileofs_t r;
128
129 if (offset > 0 &&
130 offset > (lws_fileofs_t)fop_fd->len - (lws_fileofs_t)fop_fd->pos)
131 offset = (lws_fileofs_t)(fop_fd->len - fop_fd->pos);
132
133 if ((lws_fileofs_t)fop_fd->pos + offset < 0)
134 offset = (lws_fileofs_t)(-fop_fd->pos);
135
136 r = lseek(fop_fd->fd, (off_t)offset, SEEK_CUR);
137
138 if (r >= 0)
139 fop_fd->pos = (lws_filepos_t)r;
140 else
141 lwsl_err("error seeking from cur %ld, offset %ld\n",
142 (long)fop_fd->pos, (long)offset);
143
144 return r;
145 }
146
147 int
_lws_plat_file_read(lws_fop_fd_t fop_fd,lws_filepos_t * amount,uint8_t * buf,lws_filepos_t len)148 _lws_plat_file_read(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
149 uint8_t *buf, lws_filepos_t len)
150 {
151 ssize_t n;
152
153 n = read((int)fop_fd->fd, buf, (size_t)len);
154 if (n == -1l) {
155 *amount = 0;
156 return -1;
157 }
158 fop_fd->pos = (lws_filepos_t)(fop_fd->pos + (lws_filepos_t)n);
159 lwsl_debug("%s: read %ld of req %ld, pos %ld, len %ld\n", __func__,
160 (long)n, (long)len, (long)fop_fd->pos,
161 (long)fop_fd->len);
162 *amount = (lws_filepos_t)n;
163
164 return 0;
165 }
166
167 int
_lws_plat_file_write(lws_fop_fd_t fop_fd,lws_filepos_t * amount,uint8_t * buf,lws_filepos_t len)168 _lws_plat_file_write(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
169 uint8_t *buf, lws_filepos_t len)
170 {
171 ssize_t n;
172
173 n = write((int)fop_fd->fd, buf, (size_t)len);
174 if (n == -1) {
175 *amount = 0;
176 return -1;
177 }
178
179 fop_fd->pos = (lws_filepos_t)(fop_fd->pos + (lws_filepos_t)n);
180 *amount = (lws_filepos_t)n;
181
182 return 0;
183 }
184
185