| 1 | /* |
| 2 | * Copyright (c) 2014 Lukasz Marek <lukasz.m.luki@gmail.com> |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include <libsmbclient.h> |
| 22 | #include "libavutil/avstring.h" |
| 23 | #include "libavutil/opt.h" |
| 24 | #include "avformat.h" |
| 25 | #include "internal.h" |
| 26 | #include "url.h" |
| 27 | |
| 28 | typedef struct { |
| 29 | const AVClass *class; |
| 30 | SMBCCTX *ctx; |
| 31 | int fd; |
| 32 | int64_t filesize; |
| 33 | int trunc; |
| 34 | int timeout; |
| 35 | char *workgroup; |
| 36 | } LIBSMBContext; |
| 37 | |
| 38 | static void libsmbc_get_auth_data(SMBCCTX *c, const char *server, const char *share, |
| 39 | char *workgroup, int workgroup_len, |
| 40 | char *username, int username_len, |
| 41 | char *password, int password_len) |
| 42 | { |
| 43 | /* Do nothing yet. Credentials are passed via url. |
| 44 | * Callback must exists, there might be a segmentation fault otherwise. */ |
| 45 | } |
| 46 | |
| 47 | static av_cold int libsmbc_connect(URLContext *h) |
| 48 | { |
| 49 | LIBSMBContext *libsmbc = h->priv_data; |
| 50 | |
| 51 | libsmbc->ctx = smbc_new_context(); |
| 52 | if (!libsmbc->ctx) { |
| 53 | av_log(h, AV_LOG_ERROR, "Cannot create context: %s.\n", strerror(errno)); |
| 54 | return AVERROR(errno); |
| 55 | } |
| 56 | if (!smbc_init_context(libsmbc->ctx)) { |
| 57 | av_log(h, AV_LOG_ERROR, "Cannot initialize context: %s.\n", strerror(errno)); |
| 58 | return AVERROR(errno); |
| 59 | } |
| 60 | smbc_set_context(libsmbc->ctx); |
| 61 | |
| 62 | smbc_setOptionUserData(libsmbc->ctx, h); |
| 63 | smbc_setFunctionAuthDataWithContext(libsmbc->ctx, libsmbc_get_auth_data); |
| 64 | |
| 65 | if (libsmbc->timeout != -1) |
| 66 | smbc_setTimeout(libsmbc->ctx, libsmbc->timeout); |
| 67 | if (libsmbc->workgroup) |
| 68 | smbc_setWorkgroup(libsmbc->ctx, libsmbc->workgroup); |
| 69 | |
| 70 | if (smbc_init(NULL, 0) < 0) { |
| 71 | av_log(h, AV_LOG_ERROR, "Initialization failed: %s\n", strerror(errno)); |
| 72 | return AVERROR(errno); |
| 73 | } |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static av_cold int libsmbc_close(URLContext *h) |
| 78 | { |
| 79 | LIBSMBContext *libsmbc = h->priv_data; |
| 80 | if (libsmbc->fd >= 0) { |
| 81 | smbc_close(libsmbc->fd); |
| 82 | libsmbc->fd = -1; |
| 83 | } |
| 84 | if (libsmbc->ctx) { |
| 85 | smbc_free_context(libsmbc->ctx, 1); |
| 86 | libsmbc->ctx = NULL; |
| 87 | } |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static av_cold int libsmbc_open(URLContext *h, const char *url, int flags) |
| 92 | { |
| 93 | LIBSMBContext *libsmbc = h->priv_data; |
| 94 | int access, ret; |
| 95 | struct stat st; |
| 96 | |
| 97 | libsmbc->fd = -1; |
| 98 | libsmbc->filesize = -1; |
| 99 | |
| 100 | if ((ret = libsmbc_connect(h)) < 0) |
| 101 | goto fail; |
| 102 | |
| 103 | if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) { |
| 104 | access = O_CREAT | O_RDWR; |
| 105 | if (libsmbc->trunc) |
| 106 | access |= O_TRUNC; |
| 107 | } else if (flags & AVIO_FLAG_WRITE) { |
| 108 | access = O_CREAT | O_WRONLY; |
| 109 | if (libsmbc->trunc) |
| 110 | access |= O_TRUNC; |
| 111 | } else |
| 112 | access = O_RDONLY; |
| 113 | |
| 114 | /* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */ |
| 115 | if ((libsmbc->fd = smbc_open(url, access, 0666)) < 0) { |
| 116 | ret = AVERROR(errno); |
| 117 | av_log(h, AV_LOG_ERROR, "File open failed: %s\n", strerror(errno)); |
| 118 | goto fail; |
| 119 | } |
| 120 | |
| 121 | if (smbc_fstat(libsmbc->fd, &st) < 0) |
| 122 | av_log(h, AV_LOG_WARNING, "Cannot stat file: %s\n", strerror(errno)); |
| 123 | else |
| 124 | libsmbc->filesize = st.st_size; |
| 125 | |
| 126 | return 0; |
| 127 | fail: |
| 128 | libsmbc_close(h); |
| 129 | return ret; |
| 130 | } |
| 131 | |
| 132 | static int64_t libsmbc_seek(URLContext *h, int64_t pos, int whence) |
| 133 | { |
| 134 | LIBSMBContext *libsmbc = h->priv_data; |
| 135 | int64_t newpos; |
| 136 | |
| 137 | if (whence == AVSEEK_SIZE) { |
| 138 | if (libsmbc->filesize == -1) { |
| 139 | av_log(h, AV_LOG_ERROR, "Error during seeking: filesize is unknown.\n"); |
| 140 | return AVERROR(EIO); |
| 141 | } else |
| 142 | return libsmbc->filesize; |
| 143 | } |
| 144 | |
| 145 | if ((newpos = smbc_lseek(libsmbc->fd, pos, whence)) < 0) { |
| 146 | int err = errno; |
| 147 | av_log(h, AV_LOG_ERROR, "Error during seeking: %s\n", strerror(err)); |
| 148 | return AVERROR(err); |
| 149 | } |
| 150 | |
| 151 | return newpos; |
| 152 | } |
| 153 | |
| 154 | static int libsmbc_read(URLContext *h, unsigned char *buf, int size) |
| 155 | { |
| 156 | LIBSMBContext *libsmbc = h->priv_data; |
| 157 | int bytes_read; |
| 158 | |
| 159 | if ((bytes_read = smbc_read(libsmbc->fd, buf, size)) < 0) { |
| 160 | av_log(h, AV_LOG_ERROR, "Read error: %s\n", strerror(errno)); |
| 161 | return AVERROR(errno); |
| 162 | } |
| 163 | |
| 164 | return bytes_read; |
| 165 | } |
| 166 | |
| 167 | static int libsmbc_write(URLContext *h, const unsigned char *buf, int size) |
| 168 | { |
| 169 | LIBSMBContext *libsmbc = h->priv_data; |
| 170 | int bytes_written; |
| 171 | |
| 172 | if ((bytes_written = smbc_write(libsmbc->fd, buf, size)) < 0) { |
| 173 | av_log(h, AV_LOG_ERROR, "Write error: %s\n", strerror(errno)); |
| 174 | return AVERROR(errno); |
| 175 | } |
| 176 | |
| 177 | return bytes_written; |
| 178 | } |
| 179 | |
| 180 | #define OFFSET(x) offsetof(LIBSMBContext, x) |
| 181 | #define D AV_OPT_FLAG_DECODING_PARAM |
| 182 | #define E AV_OPT_FLAG_ENCODING_PARAM |
| 183 | static const AVOption options[] = { |
| 184 | {"timeout", "set timeout in ms of socket I/O operations", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E }, |
| 185 | {"truncate", "truncate existing files on write", OFFSET(trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E }, |
| 186 | {"workgroup", "set the workgroup used for making connections", OFFSET(workgroup), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E }, |
| 187 | {NULL} |
| 188 | }; |
| 189 | |
| 190 | static const AVClass libsmbclient_context_class = { |
| 191 | .class_name = "libsmbc", |
| 192 | .item_name = av_default_item_name, |
| 193 | .option = options, |
| 194 | .version = LIBAVUTIL_VERSION_INT, |
| 195 | }; |
| 196 | |
| 197 | URLProtocol ff_libsmbclient_protocol = { |
| 198 | .name = "smb", |
| 199 | .url_open = libsmbc_open, |
| 200 | .url_read = libsmbc_read, |
| 201 | .url_write = libsmbc_write, |
| 202 | .url_seek = libsmbc_seek, |
| 203 | .url_close = libsmbc_close, |
| 204 | .priv_data_size = sizeof(LIBSMBContext), |
| 205 | .priv_data_class = &libsmbclient_context_class, |
| 206 | .flags = URL_PROTOCOL_FLAG_NETWORK, |
| 207 | }; |