1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 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 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 25 #include "qemu/osdep.h" 26 #include "clients.h" 27 #include "qapi/error.h" 28 #include "qemu-common.h" 29 #include "qemu/error-report.h" 30 #include "qemu/iov.h" 31 #include "qemu/log.h" 32 #include "qemu/timer.h" 33 #include "qapi/visitor.h" 34 #include "net/filter.h" 35 36 typedef struct DumpState { 37 int64_t start_ts; 38 int fd; 39 int pcap_caplen; 40 } DumpState; 41 42 #define PCAP_MAGIC 0xa1b2c3d4 43 44 struct pcap_file_hdr { 45 uint32_t magic; 46 uint16_t version_major; 47 uint16_t version_minor; 48 int32_t thiszone; 49 uint32_t sigfigs; 50 uint32_t snaplen; 51 uint32_t linktype; 52 }; 53 54 struct pcap_sf_pkthdr { 55 struct { 56 int32_t tv_sec; 57 int32_t tv_usec; 58 } ts; 59 uint32_t caplen; 60 uint32_t len; 61 }; 62 63 static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int cnt) 64 { 65 struct pcap_sf_pkthdr hdr; 66 int64_t ts; 67 int caplen; 68 size_t size = iov_size(iov, cnt); 69 struct iovec dumpiov[cnt + 1]; 70 71 /* Early return in case of previous error. */ 72 if (s->fd < 0) { 73 return size; 74 } 75 76 ts = qemu_clock_get_us(QEMU_CLOCK_VIRTUAL); 77 caplen = size > s->pcap_caplen ? s->pcap_caplen : size; 78 79 hdr.ts.tv_sec = ts / 1000000 + s->start_ts; 80 hdr.ts.tv_usec = ts % 1000000; 81 hdr.caplen = caplen; 82 hdr.len = size; 83 84 dumpiov[0].iov_base = &hdr; 85 dumpiov[0].iov_len = sizeof(hdr); 86 cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen); 87 88 if (writev(s->fd, dumpiov, cnt + 1) != sizeof(hdr) + caplen) { 89 error_report("network dump write error - stopping dump"); 90 close(s->fd); 91 s->fd = -1; 92 } 93 94 return size; 95 } 96 97 static void dump_cleanup(DumpState *s) 98 { 99 close(s->fd); 100 s->fd = -1; 101 } 102 103 static int net_dump_state_init(DumpState *s, const char *filename, 104 int len, Error **errp) 105 { 106 struct pcap_file_hdr hdr; 107 struct tm tm; 108 int fd; 109 110 fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644); 111 if (fd < 0) { 112 error_setg_errno(errp, errno, "net dump: can't open %s", filename); 113 return -1; 114 } 115 116 hdr.magic = PCAP_MAGIC; 117 hdr.version_major = 2; 118 hdr.version_minor = 4; 119 hdr.thiszone = 0; 120 hdr.sigfigs = 0; 121 hdr.snaplen = len; 122 hdr.linktype = 1; 123 124 if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) { 125 error_setg_errno(errp, errno, "net dump write error"); 126 close(fd); 127 return -1; 128 } 129 130 s->fd = fd; 131 s->pcap_caplen = len; 132 133 qemu_get_timedate(&tm, 0); 134 s->start_ts = mktime(&tm); 135 136 return 0; 137 } 138 139 #define TYPE_FILTER_DUMP "filter-dump" 140 141 #define FILTER_DUMP(obj) \ 142 OBJECT_CHECK(NetFilterDumpState, (obj), TYPE_FILTER_DUMP) 143 144 struct NetFilterDumpState { 145 NetFilterState nfs; 146 DumpState ds; 147 char *filename; 148 uint32_t maxlen; 149 }; 150 typedef struct NetFilterDumpState NetFilterDumpState; 151 152 static ssize_t filter_dump_receive_iov(NetFilterState *nf, NetClientState *sndr, 153 unsigned flags, const struct iovec *iov, 154 int iovcnt, NetPacketSent *sent_cb) 155 { 156 NetFilterDumpState *nfds = FILTER_DUMP(nf); 157 158 dump_receive_iov(&nfds->ds, iov, iovcnt); 159 return 0; 160 } 161 162 static void filter_dump_cleanup(NetFilterState *nf) 163 { 164 NetFilterDumpState *nfds = FILTER_DUMP(nf); 165 166 dump_cleanup(&nfds->ds); 167 } 168 169 static void filter_dump_setup(NetFilterState *nf, Error **errp) 170 { 171 NetFilterDumpState *nfds = FILTER_DUMP(nf); 172 173 if (!nfds->filename) { 174 error_setg(errp, "dump filter needs 'file' property set!"); 175 return; 176 } 177 178 net_dump_state_init(&nfds->ds, nfds->filename, nfds->maxlen, errp); 179 } 180 181 static void filter_dump_get_maxlen(Object *obj, Visitor *v, const char *name, 182 void *opaque, Error **errp) 183 { 184 NetFilterDumpState *nfds = FILTER_DUMP(obj); 185 uint32_t value = nfds->maxlen; 186 187 visit_type_uint32(v, name, &value, errp); 188 } 189 190 static void filter_dump_set_maxlen(Object *obj, Visitor *v, const char *name, 191 void *opaque, Error **errp) 192 { 193 NetFilterDumpState *nfds = FILTER_DUMP(obj); 194 Error *local_err = NULL; 195 uint32_t value; 196 197 visit_type_uint32(v, name, &value, &local_err); 198 if (local_err) { 199 goto out; 200 } 201 if (value == 0) { 202 error_setg(&local_err, "Property '%s.%s' doesn't take value '%u'", 203 object_get_typename(obj), name, value); 204 goto out; 205 } 206 nfds->maxlen = value; 207 208 out: 209 error_propagate(errp, local_err); 210 } 211 212 static char *file_dump_get_filename(Object *obj, Error **errp) 213 { 214 NetFilterDumpState *nfds = FILTER_DUMP(obj); 215 216 return g_strdup(nfds->filename); 217 } 218 219 static void file_dump_set_filename(Object *obj, const char *value, Error **errp) 220 { 221 NetFilterDumpState *nfds = FILTER_DUMP(obj); 222 223 g_free(nfds->filename); 224 nfds->filename = g_strdup(value); 225 } 226 227 static void filter_dump_instance_init(Object *obj) 228 { 229 NetFilterDumpState *nfds = FILTER_DUMP(obj); 230 231 nfds->maxlen = 65536; 232 233 object_property_add(obj, "maxlen", "uint32", filter_dump_get_maxlen, 234 filter_dump_set_maxlen, NULL, NULL, NULL); 235 object_property_add_str(obj, "file", file_dump_get_filename, 236 file_dump_set_filename, NULL); 237 } 238 239 static void filter_dump_instance_finalize(Object *obj) 240 { 241 NetFilterDumpState *nfds = FILTER_DUMP(obj); 242 243 g_free(nfds->filename); 244 } 245 246 static void filter_dump_class_init(ObjectClass *oc, void *data) 247 { 248 NetFilterClass *nfc = NETFILTER_CLASS(oc); 249 250 nfc->setup = filter_dump_setup; 251 nfc->cleanup = filter_dump_cleanup; 252 nfc->receive_iov = filter_dump_receive_iov; 253 } 254 255 static const TypeInfo filter_dump_info = { 256 .name = TYPE_FILTER_DUMP, 257 .parent = TYPE_NETFILTER, 258 .class_init = filter_dump_class_init, 259 .instance_init = filter_dump_instance_init, 260 .instance_finalize = filter_dump_instance_finalize, 261 .instance_size = sizeof(NetFilterDumpState), 262 }; 263 264 static void filter_dump_register_types(void) 265 { 266 type_register_static(&filter_dump_info); 267 } 268 269 type_init(filter_dump_register_types); 270