dump.c (7032B)
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/error-report.h" 29 #include "qemu/iov.h" 30 #include "qemu/module.h" 31 #include "qemu/timer.h" 32 #include "qapi/visitor.h" 33 #include "net/filter.h" 34 #include "qom/object.h" 35 #include "sysemu/rtc.h" 36 37 typedef struct DumpState { 38 int64_t start_ts; 39 int fd; 40 int pcap_caplen; 41 } DumpState; 42 43 #define PCAP_MAGIC 0xa1b2c3d4 44 45 struct pcap_file_hdr { 46 uint32_t magic; 47 uint16_t version_major; 48 uint16_t version_minor; 49 int32_t thiszone; 50 uint32_t sigfigs; 51 uint32_t snaplen; 52 uint32_t linktype; 53 }; 54 55 struct pcap_sf_pkthdr { 56 struct { 57 int32_t tv_sec; 58 int32_t tv_usec; 59 } ts; 60 uint32_t caplen; 61 uint32_t len; 62 }; 63 64 static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int cnt) 65 { 66 struct pcap_sf_pkthdr hdr; 67 int64_t ts; 68 int caplen; 69 size_t size = iov_size(iov, cnt); 70 struct iovec dumpiov[cnt + 1]; 71 72 /* Early return in case of previous error. */ 73 if (s->fd < 0) { 74 return size; 75 } 76 77 ts = qemu_clock_get_us(QEMU_CLOCK_VIRTUAL); 78 caplen = size > s->pcap_caplen ? s->pcap_caplen : size; 79 80 hdr.ts.tv_sec = ts / 1000000 + s->start_ts; 81 hdr.ts.tv_usec = ts % 1000000; 82 hdr.caplen = caplen; 83 hdr.len = size; 84 85 dumpiov[0].iov_base = &hdr; 86 dumpiov[0].iov_len = sizeof(hdr); 87 cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen); 88 89 if (writev(s->fd, dumpiov, cnt + 1) != sizeof(hdr) + caplen) { 90 error_report("network dump write error - stopping dump"); 91 close(s->fd); 92 s->fd = -1; 93 } 94 95 return size; 96 } 97 98 static void dump_cleanup(DumpState *s) 99 { 100 close(s->fd); 101 s->fd = -1; 102 } 103 104 static int net_dump_state_init(DumpState *s, const char *filename, 105 int len, Error **errp) 106 { 107 struct pcap_file_hdr hdr; 108 struct tm tm; 109 int fd; 110 111 fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644); 112 if (fd < 0) { 113 error_setg_errno(errp, errno, "net dump: can't open %s", filename); 114 return -1; 115 } 116 117 hdr.magic = PCAP_MAGIC; 118 hdr.version_major = 2; 119 hdr.version_minor = 4; 120 hdr.thiszone = 0; 121 hdr.sigfigs = 0; 122 hdr.snaplen = len; 123 hdr.linktype = 1; 124 125 if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) { 126 error_setg_errno(errp, errno, "net dump write error"); 127 close(fd); 128 return -1; 129 } 130 131 s->fd = fd; 132 s->pcap_caplen = len; 133 134 qemu_get_timedate(&tm, 0); 135 s->start_ts = mktime(&tm); 136 137 return 0; 138 } 139 140 #define TYPE_FILTER_DUMP "filter-dump" 141 142 OBJECT_DECLARE_SIMPLE_TYPE(NetFilterDumpState, FILTER_DUMP) 143 144 struct NetFilterDumpState { 145 NetFilterState nfs; 146 DumpState ds; 147 char *filename; 148 uint32_t maxlen; 149 }; 150 151 static ssize_t filter_dump_receive_iov(NetFilterState *nf, NetClientState *sndr, 152 unsigned flags, const struct iovec *iov, 153 int iovcnt, NetPacketSent *sent_cb) 154 { 155 NetFilterDumpState *nfds = FILTER_DUMP(nf); 156 157 dump_receive_iov(&nfds->ds, iov, iovcnt); 158 return 0; 159 } 160 161 static void filter_dump_cleanup(NetFilterState *nf) 162 { 163 NetFilterDumpState *nfds = FILTER_DUMP(nf); 164 165 dump_cleanup(&nfds->ds); 166 } 167 168 static void filter_dump_setup(NetFilterState *nf, Error **errp) 169 { 170 NetFilterDumpState *nfds = FILTER_DUMP(nf); 171 172 if (!nfds->filename) { 173 error_setg(errp, "dump filter needs 'file' property set!"); 174 return; 175 } 176 177 net_dump_state_init(&nfds->ds, nfds->filename, nfds->maxlen, errp); 178 } 179 180 static void filter_dump_get_maxlen(Object *obj, Visitor *v, const char *name, 181 void *opaque, Error **errp) 182 { 183 NetFilterDumpState *nfds = FILTER_DUMP(obj); 184 uint32_t value = nfds->maxlen; 185 186 visit_type_uint32(v, name, &value, errp); 187 } 188 189 static void filter_dump_set_maxlen(Object *obj, Visitor *v, const char *name, 190 void *opaque, Error **errp) 191 { 192 NetFilterDumpState *nfds = FILTER_DUMP(obj); 193 uint32_t value; 194 195 if (!visit_type_uint32(v, name, &value, errp)) { 196 return; 197 } 198 if (value == 0) { 199 error_setg(errp, "Property '%s.%s' doesn't take value '%u'", 200 object_get_typename(obj), name, value); 201 return; 202 } 203 nfds->maxlen = value; 204 } 205 206 static char *file_dump_get_filename(Object *obj, Error **errp) 207 { 208 NetFilterDumpState *nfds = FILTER_DUMP(obj); 209 210 return g_strdup(nfds->filename); 211 } 212 213 static void file_dump_set_filename(Object *obj, const char *value, Error **errp) 214 { 215 NetFilterDumpState *nfds = FILTER_DUMP(obj); 216 217 g_free(nfds->filename); 218 nfds->filename = g_strdup(value); 219 } 220 221 static void filter_dump_instance_init(Object *obj) 222 { 223 NetFilterDumpState *nfds = FILTER_DUMP(obj); 224 225 nfds->maxlen = 65536; 226 } 227 228 static void filter_dump_instance_finalize(Object *obj) 229 { 230 NetFilterDumpState *nfds = FILTER_DUMP(obj); 231 232 g_free(nfds->filename); 233 } 234 235 static void filter_dump_class_init(ObjectClass *oc, void *data) 236 { 237 NetFilterClass *nfc = NETFILTER_CLASS(oc); 238 239 object_class_property_add(oc, "maxlen", "uint32", filter_dump_get_maxlen, 240 filter_dump_set_maxlen, NULL, NULL); 241 object_class_property_add_str(oc, "file", file_dump_get_filename, 242 file_dump_set_filename); 243 244 nfc->setup = filter_dump_setup; 245 nfc->cleanup = filter_dump_cleanup; 246 nfc->receive_iov = filter_dump_receive_iov; 247 } 248 249 static const TypeInfo filter_dump_info = { 250 .name = TYPE_FILTER_DUMP, 251 .parent = TYPE_NETFILTER, 252 .class_init = filter_dump_class_init, 253 .instance_init = filter_dump_instance_init, 254 .instance_finalize = filter_dump_instance_finalize, 255 .instance_size = sizeof(NetFilterDumpState), 256 }; 257 258 static void filter_dump_register_types(void) 259 { 260 type_register_static(&filter_dump_info); 261 } 262 263 type_init(filter_dump_register_types);