| 1 | #include "qemu/osdep.h" |
| 2 | #include "block/qdict.h" /* for qdict_extract_subqdict() */ |
| 3 | #include "qapi/error.h" |
| 4 | #include "qobject/qdict.h" |
| 5 | #include "qobject/qlist.h" |
| 6 | #include "qemu/error-report.h" |
| 7 | #include "qemu/option.h" |
| 8 | #include "qemu/config-file.h" |
| 9 | |
| 10 | QemuOptsList *vm_config_groups[48]; |
| 11 | QemuOptsList *drive_config_groups[5]; |
| 12 | |
| 13 | static QemuOptsList *find_list(QemuOptsList **lists, const char *group, |
| 14 | Error **errp) |
| 15 | { |
| 16 | int i; |
| 17 | |
| 18 | qemu_load_module_for_opts(group); |
| 19 | for (i = 0; lists[i] != NULL; i++) { |
| 20 | if (strcmp(lists[i]->name, group) == 0) |
| 21 | break; |
| 22 | } |
| 23 | if (lists[i] == NULL) { |
| 24 | error_setg(errp, "There is no option group '%s'", group); |
| 25 | } |
| 26 | return lists[i]; |
| 27 | } |
| 28 | |
| 29 | QemuOptsList *qemu_find_opts(const char *group) |
| 30 | { |
| 31 | QemuOptsList *ret; |
| 32 | Error *local_err = NULL; |
| 33 | |
| 34 | ret = find_list(vm_config_groups, group, &local_err); |
| 35 | if (local_err) { |
| 36 | error_report_err(local_err); |
| 37 | } |
| 38 | |
| 39 | return ret; |
| 40 | } |
| 41 | |
| 42 | QemuOpts *qemu_find_opts_singleton(const char *group) |
| 43 | { |
| 44 | QemuOptsList *list; |
| 45 | QemuOpts *opts; |
| 46 | |
| 47 | list = qemu_find_opts(group); |
| 48 | assert(list); |
| 49 | opts = qemu_opts_find(list, NULL); |
| 50 | if (!opts) { |
| 51 | opts = qemu_opts_create(list, NULL, 0, &error_abort); |
| 52 | } |
| 53 | return opts; |
| 54 | } |
| 55 | |
| 56 | QemuOptsList *qemu_find_opts_err(const char *group, Error **errp) |
| 57 | { |
| 58 | return find_list(vm_config_groups, group, errp); |
| 59 | } |
| 60 | |
| 61 | void qemu_add_drive_opts(QemuOptsList *list) |
| 62 | { |
| 63 | int entries, i; |
| 64 | |
| 65 | entries = ARRAY_SIZE(drive_config_groups); |
| 66 | entries--; /* keep list NULL terminated */ |
| 67 | for (i = 0; i < entries; i++) { |
| 68 | if (drive_config_groups[i] == NULL) { |
| 69 | drive_config_groups[i] = list; |
| 70 | return; |
| 71 | } |
| 72 | } |
| 73 | fprintf(stderr, "ran out of space in drive_config_groups"); |
| 74 | abort(); |
| 75 | } |
| 76 | |
| 77 | void qemu_add_opts(QemuOptsList *list) |
| 78 | { |
| 79 | int entries, i; |
| 80 | |
| 81 | entries = ARRAY_SIZE(vm_config_groups); |
| 82 | entries--; /* keep list NULL terminated */ |
| 83 | for (i = 0; i < entries; i++) { |
| 84 | if (vm_config_groups[i] == NULL) { |
| 85 | vm_config_groups[i] = list; |
| 86 | return; |
| 87 | } |
| 88 | } |
| 89 | fprintf(stderr, "ran out of space in vm_config_groups"); |
| 90 | abort(); |
| 91 | } |
| 92 | |
| 93 | /* Returns number of config groups on success, -errno on error */ |
| 94 | static int qemu_config_foreach(FILE *fp, QEMUConfigCB *cb, void *opaque, |
| 95 | const char *fname, Error **errp) |
| 96 | { |
| 97 | ERRP_GUARD(); |
| 98 | char line[1024], prev_group[64], group[64], arg[64], value[1024]; |
| 99 | Location loc; |
| 100 | QDict *qdict = NULL; |
| 101 | int res = -EINVAL, lno = 0; |
| 102 | int count = 0; |
| 103 | |
| 104 | loc_push_none(&loc); |
| 105 | while (fgets(line, sizeof(line), fp) != NULL) { |
| 106 | ++lno; |
| 107 | if (line[0] == '\n') { |
| 108 | /* skip empty lines */ |
| 109 | continue; |
| 110 | } |
| 111 | if (line[0] == '#') { |
| 112 | /* comment */ |
| 113 | continue; |
| 114 | } |
| 115 | if (line[0] == '[') { |
| 116 | QDict *prev = qdict; |
| 117 | if (sscanf(line, "[%63s \"%63[^\"]\"]", group, value) == 2) { |
| 118 | qdict = qdict_new(); |
| 119 | qdict_put_str(qdict, "id", value); |
| 120 | count++; |
| 121 | } else if (sscanf(line, "[%63[^]]]", group) == 1) { |
| 122 | qdict = qdict_new(); |
| 123 | count++; |
| 124 | } |
| 125 | if (qdict != prev) { |
| 126 | if (prev) { |
| 127 | cb(prev_group, prev, opaque, errp); |
| 128 | qobject_unref(prev); |
| 129 | if (*errp) { |
| 130 | goto out; |
| 131 | } |
| 132 | } |
| 133 | strcpy(prev_group, group); |
| 134 | continue; |
| 135 | } |
| 136 | } |
| 137 | loc_set_file(fname, lno); |
| 138 | value[0] = '\0'; |
| 139 | if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2 || |
| 140 | sscanf(line, " %63s = \"\"", arg) == 1) { |
| 141 | /* arg = value */ |
| 142 | if (qdict == NULL) { |
| 143 | error_setg(errp, "no group defined"); |
| 144 | goto out; |
| 145 | } |
| 146 | qdict_put_str(qdict, arg, value); |
| 147 | continue; |
| 148 | } |
| 149 | error_setg(errp, "parse error"); |
| 150 | goto out; |
| 151 | } |
| 152 | if (ferror(fp)) { |
| 153 | loc_pop(&loc); |
| 154 | error_setg_errno(errp, errno, "Cannot read config file"); |
| 155 | goto out_no_loc; |
| 156 | } |
| 157 | res = count; |
| 158 | if (qdict) { |
| 159 | cb(group, qdict, opaque, errp); |
| 160 | } |
| 161 | out: |
| 162 | loc_pop(&loc); |
| 163 | out_no_loc: |
| 164 | qobject_unref(qdict); |
| 165 | return res; |
| 166 | } |
| 167 | |
| 168 | void qemu_config_do_parse(const char *group, QDict *qdict, void *opaque, Error **errp) |
| 169 | { |
| 170 | QemuOptsList **lists = opaque; |
| 171 | QemuOptsList *list; |
| 172 | |
| 173 | list = find_list(lists, group, errp); |
| 174 | if (!list) { |
| 175 | return; |
| 176 | } |
| 177 | |
| 178 | qemu_opts_from_qdict(list, qdict, errp); |
| 179 | } |
| 180 | |
| 181 | int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error **errp) |
| 182 | { |
| 183 | return qemu_config_foreach(fp, qemu_config_do_parse, lists, fname, errp); |
| 184 | } |
| 185 | |
| 186 | int qemu_read_config_file(const char *filename, QEMUConfigCB *cb, Error **errp) |
| 187 | { |
| 188 | FILE *f = fopen(filename, "r"); |
| 189 | int ret; |
| 190 | |
| 191 | if (f == NULL) { |
| 192 | error_setg_file_open(errp, errno, filename); |
| 193 | return -errno; |
| 194 | } |
| 195 | |
| 196 | ret = qemu_config_foreach(f, cb, vm_config_groups, filename, errp); |
| 197 | fclose(f); |
| 198 | return ret; |
| 199 | } |
| 200 | |
| 201 | static bool config_parse_qdict_section(QDict *options, QemuOptsList *opts, |
| 202 | Error **errp) |
| 203 | { |
| 204 | QemuOpts *subopts; |
| 205 | g_autoptr(QDict) subqdict = NULL; |
| 206 | g_autoptr(QList) list = NULL; |
| 207 | size_t orig_size, enum_size; |
| 208 | char *prefix; |
| 209 | |
| 210 | prefix = g_strdup_printf("%s.", opts->name); |
| 211 | qdict_extract_subqdict(options, &subqdict, prefix); |
| 212 | g_free(prefix); |
| 213 | orig_size = qdict_size(subqdict); |
| 214 | if (!orig_size) { |
| 215 | return true; |
| 216 | } |
| 217 | |
| 218 | subopts = qemu_opts_create(opts, NULL, 0, errp); |
| 219 | if (!subopts) { |
| 220 | return false; |
| 221 | } |
| 222 | |
| 223 | if (!qemu_opts_absorb_qdict(subopts, subqdict, errp)) { |
| 224 | return false; |
| 225 | } |
| 226 | |
| 227 | enum_size = qdict_size(subqdict); |
| 228 | if (enum_size < orig_size && enum_size) { |
| 229 | error_setg(errp, "Unknown option '%s' for [%s]", |
| 230 | qdict_first(subqdict)->key, opts->name); |
| 231 | return false; |
| 232 | } |
| 233 | |
| 234 | if (enum_size) { |
| 235 | /* Multiple, enumerated sections */ |
| 236 | QListEntry *list_entry; |
| 237 | unsigned i = 0; |
| 238 | |
| 239 | /* Not required anymore */ |
| 240 | qemu_opts_del(subopts); |
| 241 | |
| 242 | qdict_array_split(subqdict, &list); |
| 243 | if (qdict_size(subqdict)) { |
| 244 | error_setg(errp, "Unused option '%s' for [%s]", |
| 245 | qdict_first(subqdict)->key, opts->name); |
| 246 | return false; |
| 247 | } |
| 248 | |
| 249 | QLIST_FOREACH_ENTRY(list, list_entry) { |
| 250 | QDict *section = qobject_to(QDict, qlist_entry_obj(list_entry)); |
| 251 | char *opt_name; |
| 252 | |
| 253 | if (!section) { |
| 254 | error_setg(errp, "[%s] section (index %u) does not consist of " |
| 255 | "keys", opts->name, i); |
| 256 | return false; |
| 257 | } |
| 258 | |
| 259 | opt_name = g_strdup_printf("%s.%u", opts->name, i++); |
| 260 | subopts = qemu_opts_create(opts, opt_name, 1, errp); |
| 261 | g_free(opt_name); |
| 262 | if (!subopts) { |
| 263 | return false; |
| 264 | } |
| 265 | |
| 266 | if (!qemu_opts_absorb_qdict(subopts, section, errp)) { |
| 267 | qemu_opts_del(subopts); |
| 268 | return false; |
| 269 | } |
| 270 | |
| 271 | if (qdict_size(section)) { |
| 272 | error_setg(errp, "[%s] section doesn't support the option '%s'", |
| 273 | opts->name, qdict_first(section)->key); |
| 274 | qemu_opts_del(subopts); |
| 275 | return false; |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | return true; |
| 281 | } |
| 282 | |
| 283 | bool qemu_config_parse_qdict(QDict *options, QemuOptsList **lists, |
| 284 | Error **errp) |
| 285 | { |
| 286 | int i; |
| 287 | |
| 288 | for (i = 0; lists[i]; i++) { |
| 289 | if (!config_parse_qdict_section(options, lists[i], errp)) { |
| 290 | return false; |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | return true; |
| 295 | } |