bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 1 | /* |
| 2 | * tftp.c - a simple, read-only tftp server for qemu |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 4 | * Copyright (c) 2004 Magnus Damm <damm@opensource.se> |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 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 deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * 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 |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
Peter Maydell | 7df7482 | 2016-01-29 17:49:59 +0000 | [diff] [blame] | 25 | #include "qemu/osdep.h" |
Markus Armbruster | a9c9427 | 2016-06-22 19:11:19 +0200 | [diff] [blame] | 26 | #include "slirp.h" |
Jan Kiszka | 0d62c4c | 2009-06-24 14:42:29 +0200 | [diff] [blame] | 27 | #include "qemu-common.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 28 | #include "qemu/cutils.h" |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 29 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 30 | static inline int tftp_session_in_use(struct tftp_session *spt) |
| 31 | { |
| 32 | return (spt->slirp != NULL); |
| 33 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 34 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 35 | static inline void tftp_session_update(struct tftp_session *spt) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 36 | { |
bellard | a3504c8 | 2004-08-25 20:55:44 +0000 | [diff] [blame] | 37 | spt->timestamp = curtime; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | static void tftp_session_terminate(struct tftp_session *spt) |
| 41 | { |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 42 | if (spt->fd >= 0) { |
| 43 | close(spt->fd); |
| 44 | spt->fd = -1; |
| 45 | } |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 46 | g_free(spt->filename); |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 47 | spt->slirp = NULL; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 48 | } |
| 49 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 50 | static int tftp_session_allocate(Slirp *slirp, struct sockaddr_storage *srcsas, |
| 51 | struct tftp_t *tp) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 52 | { |
| 53 | struct tftp_session *spt; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 54 | int k; |
| 55 | |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 56 | for (k = 0; k < TFTP_SESSIONS_MAX; k++) { |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 57 | spt = &slirp->tftp_sessions[k]; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 58 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 59 | if (!tftp_session_in_use(spt)) |
bellard | a3504c8 | 2004-08-25 20:55:44 +0000 | [diff] [blame] | 60 | goto found; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 61 | |
| 62 | /* sessions time out after 5 inactive seconds */ |
Jan Kiszka | 9367964 | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 63 | if ((int)(curtime - spt->timestamp) > 5000) { |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 64 | tftp_session_terminate(spt); |
bellard | a3504c8 | 2004-08-25 20:55:44 +0000 | [diff] [blame] | 65 | goto found; |
Jan Kiszka | 9367964 | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 66 | } |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | return -1; |
| 70 | |
| 71 | found: |
| 72 | memset(spt, 0, sizeof(*spt)); |
Marc-André Lureau | 17eb587 | 2017-03-23 15:31:56 +0400 | [diff] [blame] | 73 | memcpy(&spt->client_addr, srcsas, sockaddr_size(srcsas)); |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 74 | spt->fd = -1; |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 75 | spt->block_size = 512; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 76 | spt->client_port = tp->udp.uh_sport; |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 77 | spt->slirp = slirp; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 78 | |
| 79 | tftp_session_update(spt); |
| 80 | |
| 81 | return k; |
| 82 | } |
| 83 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 84 | static int tftp_session_find(Slirp *slirp, struct sockaddr_storage *srcsas, |
| 85 | struct tftp_t *tp) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 86 | { |
| 87 | struct tftp_session *spt; |
| 88 | int k; |
| 89 | |
| 90 | for (k = 0; k < TFTP_SESSIONS_MAX; k++) { |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 91 | spt = &slirp->tftp_sessions[k]; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 92 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 93 | if (tftp_session_in_use(spt)) { |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 94 | if (sockaddr_equal(&spt->client_addr, srcsas)) { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 95 | if (spt->client_port == tp->udp.uh_sport) { |
| 96 | return k; |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | return -1; |
| 103 | } |
| 104 | |
Hervé Poussineau | 4aa401f | 2012-09-13 12:39:36 +0200 | [diff] [blame] | 105 | static int tftp_read_data(struct tftp_session *spt, uint32_t block_nr, |
Stefan Weil | b6dce92 | 2010-07-22 22:15:23 +0200 | [diff] [blame] | 106 | uint8_t *buf, int len) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 107 | { |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 108 | int bytes_read = 0; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 109 | |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 110 | if (spt->fd < 0) { |
| 111 | spt->fd = open(spt->filename, O_RDONLY | O_BINARY); |
| 112 | } |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 113 | |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 114 | if (spt->fd < 0) { |
| 115 | return -1; |
| 116 | } |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 117 | |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 118 | if (len) { |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 119 | lseek(spt->fd, block_nr * spt->block_size, SEEK_SET); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 120 | |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 121 | bytes_read = read(spt->fd, buf, len); |
| 122 | } |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 123 | |
Hervé Poussineau | 78be056 | 2012-09-10 20:52:25 +0200 | [diff] [blame] | 124 | return bytes_read; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 125 | } |
| 126 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 127 | static struct tftp_t *tftp_prep_mbuf_data(struct tftp_session *spt, |
| 128 | struct mbuf *m) |
| 129 | { |
| 130 | struct tftp_t *tp; |
| 131 | |
| 132 | memset(m->m_data, 0, m->m_size); |
| 133 | |
| 134 | m->m_data += IF_MAXLINKHDR; |
| 135 | if (spt->client_addr.ss_family == AF_INET6) { |
| 136 | m->m_data += sizeof(struct ip6); |
| 137 | } else { |
| 138 | m->m_data += sizeof(struct ip); |
| 139 | } |
| 140 | tp = (void *)m->m_data; |
| 141 | m->m_data += sizeof(struct udphdr); |
| 142 | |
| 143 | return tp; |
| 144 | } |
| 145 | |
| 146 | static void tftp_udp_output(struct tftp_session *spt, struct mbuf *m, |
| 147 | struct tftp_t *recv_tp) |
| 148 | { |
| 149 | if (spt->client_addr.ss_family == AF_INET6) { |
| 150 | struct sockaddr_in6 sa6, da6; |
| 151 | |
| 152 | sa6.sin6_addr = spt->slirp->vhost_addr6; |
| 153 | sa6.sin6_port = recv_tp->udp.uh_dport; |
| 154 | da6.sin6_addr = ((struct sockaddr_in6 *)&spt->client_addr)->sin6_addr; |
| 155 | da6.sin6_port = spt->client_port; |
| 156 | |
| 157 | udp6_output(NULL, m, &sa6, &da6); |
| 158 | } else { |
| 159 | struct sockaddr_in sa4, da4; |
| 160 | |
| 161 | sa4.sin_addr = spt->slirp->vhost_addr; |
| 162 | sa4.sin_port = recv_tp->udp.uh_dport; |
| 163 | da4.sin_addr = ((struct sockaddr_in *)&spt->client_addr)->sin_addr; |
| 164 | da4.sin_port = spt->client_port; |
| 165 | |
| 166 | udp_output(NULL, m, &sa4, &da4, IPTOS_LOWDELAY); |
| 167 | } |
| 168 | } |
| 169 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 170 | static int tftp_send_oack(struct tftp_session *spt, |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 171 | const char *keys[], uint32_t values[], int nb, |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 172 | struct tftp_t *recv_tp) |
| 173 | { |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 174 | struct mbuf *m; |
| 175 | struct tftp_t *tp; |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 176 | int i, n = 0; |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 177 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 178 | m = m_get(spt->slirp); |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 179 | |
| 180 | if (!m) |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 181 | return -1; |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 182 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 183 | tp = tftp_prep_mbuf_data(spt, m); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 184 | |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 185 | tp->tp_op = htons(TFTP_OACK); |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 186 | for (i = 0; i < nb; i++) { |
| 187 | n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s", |
| 188 | keys[i]) + 1; |
| 189 | n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u", |
| 190 | values[i]) + 1; |
| 191 | } |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 192 | |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 193 | m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + n |
| 194 | - sizeof(struct udphdr); |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 195 | tftp_udp_output(spt, m, recv_tp); |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
Jan Kiszka | ef2d54d | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 200 | static void tftp_send_error(struct tftp_session *spt, |
Stefan Weil | b6dce92 | 2010-07-22 22:15:23 +0200 | [diff] [blame] | 201 | uint16_t errorcode, const char *msg, |
Jan Kiszka | ef2d54d | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 202 | struct tftp_t *recv_tp) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 203 | { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 204 | struct mbuf *m; |
| 205 | struct tftp_t *tp; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 206 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 207 | m = m_get(spt->slirp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 208 | |
| 209 | if (!m) { |
Jan Kiszka | ef2d54d | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 210 | goto out; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 211 | } |
| 212 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 213 | tp = tftp_prep_mbuf_data(spt, m); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 214 | |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 215 | tp->tp_op = htons(TFTP_ERROR); |
| 216 | tp->x.tp_error.tp_error_code = htons(errorcode); |
blueswir1 | b55266b | 2008-09-20 08:07:15 +0000 | [diff] [blame] | 217 | pstrcpy((char *)tp->x.tp_error.tp_msg, sizeof(tp->x.tp_error.tp_msg), msg); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 218 | |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 219 | m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + 3 + strlen(msg) |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 220 | - sizeof(struct udphdr); |
| 221 | tftp_udp_output(spt, m, recv_tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 222 | |
Jan Kiszka | ef2d54d | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 223 | out: |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 224 | tftp_session_terminate(spt); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 225 | } |
| 226 | |
Jan Kiszka | eb7faf0 | 2012-09-13 12:44:27 +0200 | [diff] [blame] | 227 | static void tftp_send_next_block(struct tftp_session *spt, |
| 228 | struct tftp_t *recv_tp) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 229 | { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 230 | struct mbuf *m; |
| 231 | struct tftp_t *tp; |
| 232 | int nobytes; |
| 233 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 234 | m = m_get(spt->slirp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 235 | |
| 236 | if (!m) { |
Jan Kiszka | eb7faf0 | 2012-09-13 12:44:27 +0200 | [diff] [blame] | 237 | return; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 238 | } |
| 239 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 240 | tp = tftp_prep_mbuf_data(spt, m); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 241 | |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 242 | tp->tp_op = htons(TFTP_DATA); |
Hervé Poussineau | 4aa401f | 2012-09-13 12:39:36 +0200 | [diff] [blame] | 243 | tp->x.tp_data.tp_block_nr = htons((spt->block_nr + 1) & 0xffff); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 244 | |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 245 | nobytes = tftp_read_data(spt, spt->block_nr, tp->x.tp_data.tp_buf, |
| 246 | spt->block_size); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 247 | |
| 248 | if (nobytes < 0) { |
| 249 | m_free(m); |
| 250 | |
| 251 | /* send "file not found" error back */ |
| 252 | |
| 253 | tftp_send_error(spt, 1, "File not found", tp); |
| 254 | |
Jan Kiszka | eb7faf0 | 2012-09-13 12:44:27 +0200 | [diff] [blame] | 255 | return; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 256 | } |
| 257 | |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 258 | m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX - nobytes) |
| 259 | - sizeof(struct udphdr); |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 260 | tftp_udp_output(spt, m, recv_tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 261 | |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 262 | if (nobytes == spt->block_size) { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 263 | tftp_session_update(spt); |
| 264 | } |
| 265 | else { |
| 266 | tftp_session_terminate(spt); |
| 267 | } |
| 268 | |
Hervé Poussineau | 4aa401f | 2012-09-13 12:39:36 +0200 | [diff] [blame] | 269 | spt->block_nr++; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 270 | } |
| 271 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 272 | static void tftp_handle_rrq(Slirp *slirp, struct sockaddr_storage *srcsas, |
| 273 | struct tftp_t *tp, int pktlen) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 274 | { |
| 275 | struct tftp_session *spt; |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 276 | int s, k; |
Jan Kiszka | 9367964 | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 277 | size_t prefix_len; |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 278 | char *req_fname; |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 279 | const char *option_name[2]; |
| 280 | uint32_t option_value[2]; |
| 281 | int nb_options = 0; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 282 | |
Thomas Horsten | bfe4e17 | 2010-01-07 17:01:28 +0000 | [diff] [blame] | 283 | /* check if a session already exists and if so terminate it */ |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 284 | s = tftp_session_find(slirp, srcsas, tp); |
Thomas Horsten | bfe4e17 | 2010-01-07 17:01:28 +0000 | [diff] [blame] | 285 | if (s >= 0) { |
| 286 | tftp_session_terminate(&slirp->tftp_sessions[s]); |
| 287 | } |
| 288 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 289 | s = tftp_session_allocate(slirp, srcsas, tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 290 | |
| 291 | if (s < 0) { |
| 292 | return; |
| 293 | } |
| 294 | |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 295 | spt = &slirp->tftp_sessions[s]; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 296 | |
Deepak Kathayat | dc6fb73 | 2014-03-24 16:30:17 +0800 | [diff] [blame] | 297 | /* unspecified prefix means service disabled */ |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 298 | if (!slirp->tftp_prefix) { |
Jan Kiszka | f8e3cbd | 2009-06-24 14:42:29 +0200 | [diff] [blame] | 299 | tftp_send_error(spt, 2, "Access violation", tp); |
| 300 | return; |
| 301 | } |
| 302 | |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 303 | /* skip header fields */ |
| 304 | k = 0; |
Stefan Weil | 89d2d3af | 2011-02-23 19:40:14 +0100 | [diff] [blame] | 305 | pktlen -= offsetof(struct tftp_t, x.tp_buf); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 306 | |
Jan Kiszka | 9367964 | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 307 | /* prepend tftp_prefix */ |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 308 | prefix_len = strlen(slirp->tftp_prefix); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 309 | spt->filename = g_malloc(prefix_len + TFTP_FILENAME_MAX + 2); |
Jan Kiszka | 460fec6 | 2009-06-24 14:42:31 +0200 | [diff] [blame] | 310 | memcpy(spt->filename, slirp->tftp_prefix, prefix_len); |
Jan Kiszka | 74efd61 | 2009-06-29 08:47:30 +0200 | [diff] [blame] | 311 | spt->filename[prefix_len] = '/'; |
Jan Kiszka | 9367964 | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 312 | |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 313 | /* get name */ |
Jan Kiszka | 74efd61 | 2009-06-29 08:47:30 +0200 | [diff] [blame] | 314 | req_fname = spt->filename + prefix_len + 1; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 315 | |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 316 | while (1) { |
| 317 | if (k >= TFTP_FILENAME_MAX || k >= pktlen) { |
| 318 | tftp_send_error(spt, 2, "Access violation", tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 319 | return; |
| 320 | } |
Stefan Weil | 89d2d3af | 2011-02-23 19:40:14 +0100 | [diff] [blame] | 321 | req_fname[k] = tp->x.tp_buf[k]; |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 322 | if (req_fname[k++] == '\0') { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 323 | break; |
| 324 | } |
| 325 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 326 | |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 327 | /* check mode */ |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 328 | if ((pktlen - k) < 6) { |
| 329 | tftp_send_error(spt, 2, "Access violation", tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 330 | return; |
| 331 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 332 | |
Stefan Weil | 89d2d3af | 2011-02-23 19:40:14 +0100 | [diff] [blame] | 333 | if (strcasecmp(&tp->x.tp_buf[k], "octet") != 0) { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 334 | tftp_send_error(spt, 4, "Unsupported transfer mode", tp); |
| 335 | return; |
| 336 | } |
| 337 | |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 338 | k += 6; /* skipping octet */ |
| 339 | |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 340 | /* do sanity checks on the filename */ |
Jan Kiszka | 74efd61 | 2009-06-29 08:47:30 +0200 | [diff] [blame] | 341 | if (!strncmp(req_fname, "../", 3) || |
| 342 | req_fname[strlen(req_fname) - 1] == '/' || |
Jan Kiszka | 9367964 | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 343 | strstr(req_fname, "/../")) { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 344 | tftp_send_error(spt, 2, "Access violation", tp); |
| 345 | return; |
| 346 | } |
| 347 | |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 348 | /* check if the file exists */ |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 349 | if (tftp_read_data(spt, 0, NULL, 0) < 0) { |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 350 | tftp_send_error(spt, 1, "File not found", tp); |
| 351 | return; |
| 352 | } |
| 353 | |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 354 | if (tp->x.tp_buf[pktlen - 1] != 0) { |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 355 | tftp_send_error(spt, 2, "Access violation", tp); |
| 356 | return; |
| 357 | } |
| 358 | |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 359 | while (k < pktlen && nb_options < ARRAY_SIZE(option_name)) { |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 360 | const char *key, *value; |
| 361 | |
Stefan Weil | 89d2d3af | 2011-02-23 19:40:14 +0100 | [diff] [blame] | 362 | key = &tp->x.tp_buf[k]; |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 363 | k += strlen(key) + 1; |
| 364 | |
Jan Kiszka | 20c24bf | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 365 | if (k >= pktlen) { |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 366 | tftp_send_error(spt, 2, "Access violation", tp); |
| 367 | return; |
| 368 | } |
| 369 | |
Stefan Weil | 89d2d3af | 2011-02-23 19:40:14 +0100 | [diff] [blame] | 370 | value = &tp->x.tp_buf[k]; |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 371 | k += strlen(value) + 1; |
| 372 | |
Sergei Gavrikov | facf1a6 | 2011-01-12 15:57:18 +0200 | [diff] [blame] | 373 | if (strcasecmp(key, "tsize") == 0) { |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 374 | int tsize = atoi(value); |
| 375 | struct stat stat_p; |
| 376 | |
Jan Kiszka | f8e3cbd | 2009-06-24 14:42:29 +0200 | [diff] [blame] | 377 | if (tsize == 0) { |
Jan Kiszka | 9367964 | 2009-06-24 14:42:30 +0200 | [diff] [blame] | 378 | if (stat(spt->filename, &stat_p) == 0) |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 379 | tsize = stat_p.st_size; |
| 380 | else { |
| 381 | tftp_send_error(spt, 1, "File not found", tp); |
| 382 | return; |
| 383 | } |
| 384 | } |
| 385 | |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 386 | option_name[nb_options] = "tsize"; |
| 387 | option_value[nb_options] = tsize; |
| 388 | nb_options++; |
| 389 | } else if (strcasecmp(key, "blksize") == 0) { |
| 390 | int blksize = atoi(value); |
| 391 | |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 392 | /* Accept blksize up to our maximum size */ |
| 393 | if (blksize > 0) { |
| 394 | spt->block_size = MIN(blksize, TFTP_BLOCKSIZE_MAX); |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 395 | option_name[nb_options] = "blksize"; |
Hervé Poussineau | 9443598 | 2016-11-21 20:45:49 +0100 | [diff] [blame] | 396 | option_value[nb_options] = spt->block_size; |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 397 | nb_options++; |
| 398 | } |
ths | 1f697db | 2007-02-20 00:07:50 +0000 | [diff] [blame] | 399 | } |
| 400 | } |
| 401 | |
Hervé Poussineau | 95b1ad7 | 2012-09-13 07:55:01 +0200 | [diff] [blame] | 402 | if (nb_options > 0) { |
| 403 | assert(nb_options <= ARRAY_SIZE(option_name)); |
| 404 | tftp_send_oack(spt, option_name, option_value, nb_options, tp); |
| 405 | return; |
| 406 | } |
| 407 | |
Hervé Poussineau | 4aa401f | 2012-09-13 12:39:36 +0200 | [diff] [blame] | 408 | spt->block_nr = 0; |
| 409 | tftp_send_next_block(spt, tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 410 | } |
| 411 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 412 | static void tftp_handle_ack(Slirp *slirp, struct sockaddr_storage *srcsas, |
| 413 | struct tftp_t *tp, int pktlen) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 414 | { |
| 415 | int s; |
| 416 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 417 | s = tftp_session_find(slirp, srcsas, tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 418 | |
| 419 | if (s < 0) { |
| 420 | return; |
| 421 | } |
| 422 | |
Jan Kiszka | eb7faf0 | 2012-09-13 12:44:27 +0200 | [diff] [blame] | 423 | tftp_send_next_block(&slirp->tftp_sessions[s], tp); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 424 | } |
| 425 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 426 | static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas, |
| 427 | struct tftp_t *tp, int pktlen) |
Thomas Horsten | bfe4e17 | 2010-01-07 17:01:28 +0000 | [diff] [blame] | 428 | { |
| 429 | int s; |
| 430 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 431 | s = tftp_session_find(slirp, srcsas, tp); |
Thomas Horsten | bfe4e17 | 2010-01-07 17:01:28 +0000 | [diff] [blame] | 432 | |
| 433 | if (s < 0) { |
| 434 | return; |
| 435 | } |
| 436 | |
| 437 | tftp_session_terminate(&slirp->tftp_sessions[s]); |
| 438 | } |
| 439 | |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 440 | void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m) |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 441 | { |
| 442 | struct tftp_t *tp = (struct tftp_t *)m->m_data; |
| 443 | |
| 444 | switch(ntohs(tp->tp_op)) { |
| 445 | case TFTP_RRQ: |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 446 | tftp_handle_rrq(m->slirp, srcsas, tp, m->m_len); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 447 | break; |
| 448 | |
| 449 | case TFTP_ACK: |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 450 | tftp_handle_ack(m->slirp, srcsas, tp, m->m_len); |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 451 | break; |
Thomas Horsten | bfe4e17 | 2010-01-07 17:01:28 +0000 | [diff] [blame] | 452 | |
| 453 | case TFTP_ERROR: |
Thomas Huth | fad7fb9 | 2016-03-15 10:31:23 +0100 | [diff] [blame] | 454 | tftp_handle_error(m->slirp, srcsas, tp, m->m_len); |
Thomas Horsten | bfe4e17 | 2010-01-07 17:01:28 +0000 | [diff] [blame] | 455 | break; |
bellard | c7f7464 | 2004-08-24 21:57:12 +0000 | [diff] [blame] | 456 | } |
| 457 | } |