| 1 | /* |
| 2 | * Copyright (C) 2021 Simon Marchi <simon.marchi@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include "../command.h" |
| 9 | #include "common/argpar/argpar.h" |
| 10 | #include "common/mi-lttng.h" |
| 11 | #include <lttng/lttng.h> |
| 12 | #include <stdio.h> |
| 13 | |
| 14 | #ifdef LTTNG_EMBED_HELP |
| 15 | static const char help_msg[] = |
| 16 | #include <lttng-remove-trigger.1.h> |
| 17 | ; |
| 18 | #endif |
| 19 | |
| 20 | enum { |
| 21 | OPT_HELP, |
| 22 | OPT_LIST_OPTIONS, |
| 23 | OPT_OWNER_UID, |
| 24 | }; |
| 25 | |
| 26 | static const |
| 27 | struct argpar_opt_descr remove_trigger_options[] = { |
| 28 | { OPT_HELP, 'h', "help", false }, |
| 29 | { OPT_LIST_OPTIONS, '\0', "list-options", false }, |
| 30 | { OPT_OWNER_UID, '\0', "owner-uid", true }, |
| 31 | ARGPAR_OPT_DESCR_SENTINEL, |
| 32 | }; |
| 33 | |
| 34 | static |
| 35 | bool assign_string(char **dest, const char *src, const char *opt_name) |
| 36 | { |
| 37 | bool ret; |
| 38 | |
| 39 | if (*dest) { |
| 40 | ERR("Duplicate option '%s' given.", opt_name); |
| 41 | goto error; |
| 42 | } |
| 43 | |
| 44 | *dest = strdup(src); |
| 45 | if (!*dest) { |
| 46 | ERR("Failed to allocate '%s' string.", opt_name); |
| 47 | goto error; |
| 48 | } |
| 49 | |
| 50 | ret = true; |
| 51 | goto end; |
| 52 | |
| 53 | error: |
| 54 | ret = false; |
| 55 | |
| 56 | end: |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | int cmd_remove_trigger(int argc, const char **argv) |
| 61 | { |
| 62 | enum lttng_error_code ret_code; |
| 63 | int ret; |
| 64 | struct argpar_parse_ret argpar_parse_ret = {}; |
| 65 | const char *name = NULL; |
| 66 | int i; |
| 67 | struct lttng_triggers *triggers = NULL; |
| 68 | unsigned int triggers_count; |
| 69 | enum lttng_trigger_status trigger_status; |
| 70 | const struct lttng_trigger *trigger_to_remove = NULL; |
| 71 | char *owner_uid = NULL; |
| 72 | long long uid; |
| 73 | struct mi_writer *mi_writer = NULL; |
| 74 | |
| 75 | if (lttng_opt_mi) { |
| 76 | mi_writer = mi_lttng_writer_create( |
| 77 | fileno(stdout), lttng_opt_mi); |
| 78 | if (!mi_writer) { |
| 79 | ret = CMD_ERROR; |
| 80 | goto error; |
| 81 | } |
| 82 | |
| 83 | /* Open command element. */ |
| 84 | ret = mi_lttng_writer_command_open(mi_writer, |
| 85 | mi_lttng_element_command_remove_trigger); |
| 86 | if (ret) { |
| 87 | ret = CMD_ERROR; |
| 88 | goto error; |
| 89 | } |
| 90 | |
| 91 | /* Open output element. */ |
| 92 | ret = mi_lttng_writer_open_element( |
| 93 | mi_writer, mi_lttng_element_command_output); |
| 94 | if (ret) { |
| 95 | ret = CMD_ERROR; |
| 96 | goto error; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | argpar_parse_ret = argpar_parse(argc - 1, argv + 1, |
| 101 | remove_trigger_options, true); |
| 102 | if (!argpar_parse_ret.items) { |
| 103 | ERR("%s", argpar_parse_ret.error); |
| 104 | goto error; |
| 105 | } |
| 106 | |
| 107 | for (i = 0; i < argpar_parse_ret.items->n_items; i++) { |
| 108 | const struct argpar_item *item = |
| 109 | argpar_parse_ret.items->items[i]; |
| 110 | |
| 111 | if (item->type == ARGPAR_ITEM_TYPE_OPT) { |
| 112 | const struct argpar_item_opt *item_opt = |
| 113 | (const struct argpar_item_opt *) item; |
| 114 | |
| 115 | switch (item_opt->descr->id) { |
| 116 | case OPT_HELP: |
| 117 | SHOW_HELP(); |
| 118 | ret = 0; |
| 119 | goto end; |
| 120 | case OPT_LIST_OPTIONS: |
| 121 | list_cmd_options_argpar(stdout, |
| 122 | remove_trigger_options); |
| 123 | ret = 0; |
| 124 | goto end; |
| 125 | case OPT_OWNER_UID: |
| 126 | { |
| 127 | if (!assign_string(&owner_uid, item_opt->arg, |
| 128 | "--owner-uid")) { |
| 129 | goto error; |
| 130 | } |
| 131 | break; |
| 132 | } |
| 133 | default: |
| 134 | abort(); |
| 135 | } |
| 136 | } else { |
| 137 | const struct argpar_item_non_opt *item_non_opt = |
| 138 | (const struct argpar_item_non_opt *) item; |
| 139 | |
| 140 | if (name) { |
| 141 | ERR("Unexpected argument '%s'", item_non_opt->arg); |
| 142 | goto error; |
| 143 | } |
| 144 | |
| 145 | name = item_non_opt->arg; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | if (!name) { |
| 150 | ERR("Missing `name` argument."); |
| 151 | goto error; |
| 152 | } |
| 153 | |
| 154 | if (owner_uid) { |
| 155 | char *end; |
| 156 | |
| 157 | errno = 0; |
| 158 | uid = strtol(owner_uid, &end, 10); |
| 159 | if (end == owner_uid || *end != '\0' || errno != 0) { |
| 160 | ERR("Failed to parse `%s` as an integer.", owner_uid); |
| 161 | } |
| 162 | } else { |
| 163 | uid = geteuid(); |
| 164 | } |
| 165 | |
| 166 | ret = lttng_list_triggers(&triggers); |
| 167 | if (ret != LTTNG_OK) { |
| 168 | ERR("Failed to get the list of triggers."); |
| 169 | goto error; |
| 170 | } |
| 171 | |
| 172 | trigger_status = lttng_triggers_get_count(triggers, &triggers_count); |
| 173 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 174 | |
| 175 | for (i = 0; i < triggers_count; i++) { |
| 176 | const struct lttng_trigger *trigger; |
| 177 | const char *trigger_name; |
| 178 | uid_t trigger_uid; |
| 179 | |
| 180 | trigger = lttng_triggers_get_at_index(triggers, i); |
| 181 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); |
| 182 | switch (trigger_status) { |
| 183 | case LTTNG_TRIGGER_STATUS_OK: |
| 184 | break; |
| 185 | case LTTNG_TRIGGER_STATUS_UNSET: |
| 186 | /* Don't compare against anonymous triggers. */ |
| 187 | continue; |
| 188 | default: |
| 189 | abort(); |
| 190 | } |
| 191 | |
| 192 | trigger_status = lttng_trigger_get_owner_uid( |
| 193 | trigger, &trigger_uid); |
| 194 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 195 | |
| 196 | if (trigger_uid == uid && strcmp(trigger_name, name) == 0) { |
| 197 | trigger_to_remove = trigger; |
| 198 | break; |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | if (!trigger_to_remove) { |
| 203 | ERR("Couldn't find trigger with name `%s`.", name); |
| 204 | goto error; |
| 205 | } |
| 206 | |
| 207 | ret = lttng_unregister_trigger(trigger_to_remove); |
| 208 | if (ret != 0) { |
| 209 | ERR("Failed to unregister trigger `%s`.", name); |
| 210 | goto error; |
| 211 | } |
| 212 | |
| 213 | if (lttng_opt_mi) { |
| 214 | ret_code = lttng_trigger_mi_serialize( |
| 215 | trigger_to_remove, mi_writer, NULL); |
| 216 | if (ret_code != LTTNG_OK) { |
| 217 | goto error; |
| 218 | } |
| 219 | } |
| 220 | MSG("Removed trigger `%s`.", name); |
| 221 | |
| 222 | ret = 0; |
| 223 | goto end; |
| 224 | |
| 225 | error: |
| 226 | ret = 1; |
| 227 | |
| 228 | end: |
| 229 | /* Mi closing. */ |
| 230 | if (lttng_opt_mi) { |
| 231 | /* Close output element. */ |
| 232 | int mi_ret = mi_lttng_writer_close_element(mi_writer); |
| 233 | if (mi_ret) { |
| 234 | ret = 1; |
| 235 | goto cleanup; |
| 236 | } |
| 237 | |
| 238 | mi_ret = mi_lttng_writer_write_element_bool(mi_writer, |
| 239 | mi_lttng_element_command_success, ret ? 0 : 1); |
| 240 | if (mi_ret) { |
| 241 | ret = 1; |
| 242 | goto cleanup; |
| 243 | } |
| 244 | |
| 245 | /* Command element close. */ |
| 246 | mi_ret = mi_lttng_writer_command_close(mi_writer); |
| 247 | if (mi_ret) { |
| 248 | ret = 1; |
| 249 | goto cleanup; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | cleanup: |
| 254 | argpar_parse_ret_fini(&argpar_parse_ret); |
| 255 | lttng_triggers_destroy(triggers); |
| 256 | free(owner_uid); |
| 257 | |
| 258 | if (mi_writer && mi_lttng_writer_destroy(mi_writer)) { |
| 259 | /* Preserve original error code. */ |
| 260 | ret = ret ? ret : CMD_ERROR; |
| 261 | } |
| 262 | return ret; |
| 263 | } |