Greg Hartman | 76d05dc | 2016-11-23 15:51:27 -0800 | [diff] [blame] | 1 | /* ----------------------------------------------------------------------- * |
| 2 | * |
| 3 | * Copyright 2009-2011 Intel Corporation; author: H. Peter Anvin |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| 8 | * Boston MA 02110-1301, USA; either version 2 of the License, or |
| 9 | * (at your option) any later version; incorporated herein by reference. |
| 10 | * |
| 11 | * ----------------------------------------------------------------------- */ |
| 12 | |
| 13 | /* |
| 14 | * ftp.c |
| 15 | */ |
| 16 | #include <ctype.h> |
| 17 | #include <stdio.h> |
| 18 | #include <string.h> |
| 19 | #include <fcntl.h> |
| 20 | #include <minmax.h> |
| 21 | #include <sys/cpu.h> |
| 22 | #include <netinet/in.h> |
| 23 | #include <lwip/api.h> |
| 24 | #include "core.h" |
| 25 | #include "fs.h" |
| 26 | #include "pxe.h" |
| 27 | #include "thread.h" |
| 28 | #include "url.h" |
| 29 | #include "net.h" |
| 30 | |
| 31 | static int ftp_cmd_response(struct inode *inode, const char *cmd, |
| 32 | const char *cmd_arg, |
| 33 | uint8_t *pasv_data, int *pn_ptr) |
| 34 | { |
| 35 | struct pxe_pvt_inode *socket = PVT(inode); |
| 36 | int c; |
| 37 | int pos, code; |
| 38 | int pb, pn; |
| 39 | bool ps; |
| 40 | bool first_line, done; |
| 41 | char cmd_buf[4096]; |
| 42 | int cmd_len; |
| 43 | const char *p; |
| 44 | char *q; |
| 45 | int err; |
| 46 | |
| 47 | if (cmd) { |
| 48 | cmd_len = strlcpy(cmd_buf, cmd, sizeof cmd_buf); |
| 49 | if (cmd_len >= sizeof cmd_buf - 3) |
| 50 | return -1; |
| 51 | q = cmd_buf + cmd_len; |
| 52 | |
| 53 | if (cmd_arg) { |
| 54 | p = cmd_arg; |
| 55 | |
| 56 | *q++ = ' '; |
| 57 | cmd_len++; |
| 58 | while (*p) { |
| 59 | if (++cmd_len < sizeof cmd_buf) *q++ = *p; |
| 60 | if (*p == '\r') |
| 61 | if (++cmd_len < sizeof cmd_buf) *q++ = '\0'; |
| 62 | p++; |
| 63 | } |
| 64 | |
| 65 | if (cmd_len >= sizeof cmd_buf - 2) |
| 66 | return -1; |
| 67 | } |
| 68 | |
| 69 | *q++ = '\r'; |
| 70 | *q++ = '\n'; |
| 71 | cmd_len += 2; |
| 72 | |
| 73 | err = core_tcp_write(socket, cmd_buf, cmd_len, true); |
| 74 | if (err) |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | pos = code = pn = pb = 0; |
| 79 | ps = false; |
| 80 | first_line = true; |
| 81 | done = false; |
| 82 | |
| 83 | while ((c = pxe_getc(inode)) >= 0) { |
| 84 | if (c == '\n') { |
| 85 | if (done) { |
| 86 | if (pn) { |
| 87 | pn += ps; |
| 88 | if (pn_ptr) |
| 89 | *pn_ptr = pn; |
| 90 | } |
| 91 | return code; |
| 92 | } |
| 93 | pos = code = 0; |
| 94 | first_line = false; |
| 95 | continue; |
| 96 | } |
| 97 | |
| 98 | switch (pos++) { |
| 99 | case 0: |
| 100 | case 1: |
| 101 | case 2: |
| 102 | if (c < '0' || c > '9') { |
| 103 | if (first_line) |
| 104 | return -1; |
| 105 | else |
| 106 | pos = 4; /* Skip this line */ |
| 107 | } else { |
| 108 | code = (code*10) + (c - '0'); |
| 109 | } |
| 110 | break; |
| 111 | |
| 112 | case 3: |
| 113 | pn = pb = 0; |
| 114 | ps = false; |
| 115 | if (c == ' ') |
| 116 | done = true; |
| 117 | else if (c == '-') |
| 118 | done = false; |
| 119 | else if (first_line) |
| 120 | return -1; |
| 121 | else |
| 122 | done = false; |
| 123 | break; |
| 124 | |
| 125 | default: |
| 126 | if (pasv_data) { |
| 127 | if (c >= '0' && c <= '9') { |
| 128 | pb = (pb*10) + (c-'0'); |
| 129 | if (pn < 6) |
| 130 | pasv_data[pn] = pb; |
| 131 | ps = true; |
| 132 | } else if (c == ',') { |
| 133 | pn++; |
| 134 | pb = 0; |
| 135 | ps = false; |
| 136 | } else if (pn) { |
| 137 | pn += ps; |
| 138 | if (pn_ptr) |
| 139 | *pn_ptr = pn; |
| 140 | pn = pb = 0; |
| 141 | ps = false; |
| 142 | } |
| 143 | } |
| 144 | break; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | return -1; |
| 149 | } |
| 150 | |
| 151 | static void ftp_free(struct inode *inode) |
| 152 | { |
| 153 | struct pxe_pvt_inode *socket = PVT(inode); |
| 154 | |
| 155 | if (socket->ctl) { |
| 156 | core_tcp_close_file(socket->ctl); |
| 157 | free_socket(socket->ctl); |
| 158 | socket->ctl = NULL; |
| 159 | } |
| 160 | core_tcp_close_file(inode); |
| 161 | } |
| 162 | |
| 163 | static void ftp_close_file(struct inode *inode) |
| 164 | { |
| 165 | struct pxe_pvt_inode *socket = PVT(inode); |
| 166 | struct pxe_pvt_inode *ctlsock; |
| 167 | int resp; |
| 168 | |
| 169 | ctlsock = socket->ctl ? PVT(socket->ctl) : NULL; |
| 170 | if (core_tcp_is_connected(ctlsock)) { |
| 171 | resp = ftp_cmd_response(socket->ctl, "QUIT", NULL, NULL, NULL); |
| 172 | while (resp == 226) { |
| 173 | resp = ftp_cmd_response(socket->ctl, NULL, NULL, NULL, NULL); |
| 174 | } |
| 175 | } |
| 176 | ftp_free(inode); |
| 177 | } |
| 178 | |
| 179 | static const struct pxe_conn_ops ftp_conn_ops = { |
| 180 | .fill_buffer = core_tcp_fill_buffer, |
| 181 | .close = ftp_close_file, |
| 182 | .readdir = ftp_readdir, |
| 183 | }; |
| 184 | |
| 185 | void ftp_open(struct url_info *url, int flags, struct inode *inode, |
| 186 | const char **redir) |
| 187 | { |
| 188 | struct pxe_pvt_inode *socket = PVT(inode); |
| 189 | struct pxe_pvt_inode *ctlsock; |
| 190 | uint8_t pasv_data[6]; |
| 191 | int pasv_bytes; |
| 192 | int resp; |
| 193 | err_t err; |
| 194 | |
| 195 | (void)redir; /* FTP does not redirect */ |
| 196 | |
| 197 | inode->size = 0; |
| 198 | |
| 199 | if (!url->port) |
| 200 | url->port = 21; |
| 201 | |
| 202 | url_unescape(url->path, 0); |
| 203 | |
| 204 | socket->ops = &ftp_conn_ops; |
| 205 | |
| 206 | /* Set up the control connection */ |
| 207 | socket->ctl = alloc_inode(inode->fs, 0, sizeof(struct pxe_pvt_inode)); |
| 208 | if (!socket->ctl) |
| 209 | return; |
| 210 | ctlsock = PVT(socket->ctl); |
| 211 | ctlsock->ops = &tcp_conn_ops; /* The control connection is just TCP */ |
| 212 | if (core_tcp_open(ctlsock)) |
| 213 | goto err_free; |
| 214 | err = core_tcp_connect(ctlsock, url->ip, url->port); |
| 215 | if (err) |
| 216 | goto err_delete; |
| 217 | |
| 218 | do { |
| 219 | resp = ftp_cmd_response(socket->ctl, NULL, NULL, NULL, NULL); |
| 220 | } while (resp == 120); |
| 221 | if (resp != 220) |
| 222 | goto err_disconnect; |
| 223 | |
| 224 | if (!url->user) |
| 225 | url->user = "anonymous"; |
| 226 | if (!url->passwd) |
| 227 | url->passwd = "syslinux@"; |
| 228 | |
| 229 | resp = ftp_cmd_response(socket->ctl, "USER", url->user, NULL, NULL); |
| 230 | if (resp != 202 && resp != 230) { |
| 231 | if (resp != 331) |
| 232 | goto err_disconnect; |
| 233 | |
| 234 | resp = ftp_cmd_response(socket->ctl, "PASS", url->passwd, NULL, NULL); |
| 235 | if (resp != 230) |
| 236 | goto err_disconnect; |
| 237 | } |
| 238 | |
| 239 | if (!(flags & O_DIRECTORY)) { |
| 240 | resp = ftp_cmd_response(socket->ctl, "TYPE", "I", NULL, NULL); |
| 241 | if (resp != 200) |
| 242 | goto err_disconnect; |
| 243 | } |
| 244 | |
| 245 | resp = ftp_cmd_response(socket->ctl, "PASV", NULL, pasv_data, &pasv_bytes); |
| 246 | if (resp != 227 || pasv_bytes != 6) |
| 247 | goto err_disconnect; |
| 248 | |
| 249 | err = core_tcp_open(socket); |
| 250 | if (err) |
| 251 | goto err_disconnect; |
| 252 | err = core_tcp_connect(socket, *(uint32_t*)&pasv_data[0], |
| 253 | ntohs(*(uint16_t *)&pasv_data[4])); |
| 254 | if (err) |
| 255 | goto err_disconnect; |
| 256 | |
| 257 | resp = ftp_cmd_response(socket->ctl, |
| 258 | (flags & O_DIRECTORY) ? "LIST" : "RETR", |
| 259 | url->path, NULL, NULL); |
| 260 | if (resp != 125 && resp != 150) |
| 261 | goto err_disconnect; |
| 262 | |
| 263 | inode->size = -1; |
| 264 | return; /* Sucess! */ |
| 265 | |
| 266 | err_disconnect: |
| 267 | core_tcp_write(ctlsock, "QUIT\r\n", 6, false); |
| 268 | core_tcp_close_file(inode); |
| 269 | err_delete: |
| 270 | core_tcp_close_file(socket->ctl); |
| 271 | err_free: |
| 272 | free_socket(socket->ctl); |
| 273 | } |