| 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.hpp" |
| 9 | #include "common/argpar-utils/argpar-utils.hpp" |
| 10 | #include "common/argpar/argpar.h" |
| 11 | #include "common/mi-lttng.hpp" |
| 12 | |
| 13 | #include <lttng/lttng.h> |
| 14 | |
| 15 | #include <stdio.h> |
| 16 | |
| 17 | #ifdef LTTNG_EMBED_HELP |
| 18 | static const char help_msg[] = |
| 19 | #include <lttng-remove-trigger.1.h> |
| 20 | ; |
| 21 | #endif |
| 22 | |
| 23 | enum { |
| 24 | OPT_HELP, |
| 25 | OPT_LIST_OPTIONS, |
| 26 | OPT_OWNER_UID, |
| 27 | }; |
| 28 | |
| 29 | static const struct argpar_opt_descr remove_trigger_options[] = { |
| 30 | { OPT_HELP, 'h', "help", false }, |
| 31 | { OPT_LIST_OPTIONS, '\0', "list-options", false }, |
| 32 | { OPT_OWNER_UID, '\0', "owner-uid", true }, |
| 33 | ARGPAR_OPT_DESCR_SENTINEL, |
| 34 | }; |
| 35 | |
| 36 | static bool assign_string(char **dest, const char *src, const char *opt_name) |
| 37 | { |
| 38 | bool ret; |
| 39 | |
| 40 | if (*dest) { |
| 41 | ERR("Duplicate option '%s' given.", opt_name); |
| 42 | goto error; |
| 43 | } |
| 44 | |
| 45 | *dest = strdup(src); |
| 46 | if (!*dest) { |
| 47 | ERR("Failed to allocate '%s' string.", opt_name); |
| 48 | goto error; |
| 49 | } |
| 50 | |
| 51 | ret = true; |
| 52 | goto end; |
| 53 | |
| 54 | error: |
| 55 | ret = false; |
| 56 | |
| 57 | end: |
| 58 | return ret; |
| 59 | } |
| 60 | |
| 61 | int cmd_remove_trigger(int argc, const char **argv) |
| 62 | { |
| 63 | enum lttng_error_code ret_code; |
| 64 | int ret; |
| 65 | struct argpar_iter *argpar_iter = nullptr; |
| 66 | const struct argpar_item *argpar_item = nullptr; |
| 67 | const char *name = nullptr; |
| 68 | int i; |
| 69 | struct lttng_triggers *triggers = nullptr; |
| 70 | unsigned int triggers_count; |
| 71 | enum lttng_trigger_status trigger_status; |
| 72 | const struct lttng_trigger *trigger_to_remove = nullptr; |
| 73 | char *owner_uid = nullptr; |
| 74 | long long uid; |
| 75 | struct mi_writer *mi_writer = nullptr; |
| 76 | const char **args; |
| 77 | |
| 78 | if (lttng_opt_mi) { |
| 79 | mi_writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 80 | if (!mi_writer) { |
| 81 | ret = CMD_ERROR; |
| 82 | goto error; |
| 83 | } |
| 84 | |
| 85 | /* Open command element. */ |
| 86 | ret = mi_lttng_writer_command_open(mi_writer, |
| 87 | mi_lttng_element_command_remove_trigger); |
| 88 | if (ret) { |
| 89 | ret = CMD_ERROR; |
| 90 | goto error; |
| 91 | } |
| 92 | |
| 93 | /* Open output element. */ |
| 94 | ret = mi_lttng_writer_open_element(mi_writer, mi_lttng_element_command_output); |
| 95 | if (ret) { |
| 96 | ret = CMD_ERROR; |
| 97 | goto error; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | args = argv + 1; |
| 102 | |
| 103 | argpar_iter = argpar_iter_create(argc - 1, args, remove_trigger_options); |
| 104 | if (!argpar_iter) { |
| 105 | ERR("Failed to allocate an argpar iter."); |
| 106 | goto error; |
| 107 | } |
| 108 | |
| 109 | while (true) { |
| 110 | enum parse_next_item_status status; |
| 111 | |
| 112 | status = |
| 113 | parse_next_item(argpar_iter, &argpar_item, 1, args, true, nullptr, nullptr); |
| 114 | if (status == PARSE_NEXT_ITEM_STATUS_ERROR || |
| 115 | status == PARSE_NEXT_ITEM_STATUS_ERROR_MEMORY) { |
| 116 | goto error; |
| 117 | } else if (status == PARSE_NEXT_ITEM_STATUS_END) { |
| 118 | break; |
| 119 | } |
| 120 | |
| 121 | assert(status == PARSE_NEXT_ITEM_STATUS_OK); |
| 122 | |
| 123 | if (argpar_item_type(argpar_item) == ARGPAR_ITEM_TYPE_OPT) { |
| 124 | const struct argpar_opt_descr *descr = argpar_item_opt_descr(argpar_item); |
| 125 | const char *arg = argpar_item_opt_arg(argpar_item); |
| 126 | |
| 127 | switch (descr->id) { |
| 128 | case OPT_HELP: |
| 129 | SHOW_HELP(); |
| 130 | ret = 0; |
| 131 | goto end; |
| 132 | case OPT_LIST_OPTIONS: |
| 133 | list_cmd_options_argpar(stdout, remove_trigger_options); |
| 134 | ret = 0; |
| 135 | goto end; |
| 136 | case OPT_OWNER_UID: |
| 137 | { |
| 138 | if (!assign_string(&owner_uid, arg, "--owner-uid")) { |
| 139 | goto error; |
| 140 | } |
| 141 | break; |
| 142 | } |
| 143 | default: |
| 144 | abort(); |
| 145 | } |
| 146 | } else { |
| 147 | const char *arg = argpar_item_non_opt_arg(argpar_item); |
| 148 | |
| 149 | if (name) { |
| 150 | ERR("Unexpected argument '%s'", arg); |
| 151 | goto error; |
| 152 | } |
| 153 | |
| 154 | name = arg; |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | if (!name) { |
| 159 | ERR("Missing `name` argument."); |
| 160 | goto error; |
| 161 | } |
| 162 | |
| 163 | if (owner_uid) { |
| 164 | char *end; |
| 165 | |
| 166 | errno = 0; |
| 167 | uid = strtol(owner_uid, &end, 10); |
| 168 | if (end == owner_uid || *end != '\0' || errno != 0) { |
| 169 | ERR("Failed to parse `%s` as an integer.", owner_uid); |
| 170 | } |
| 171 | } else { |
| 172 | uid = geteuid(); |
| 173 | } |
| 174 | |
| 175 | ret = lttng_list_triggers(&triggers); |
| 176 | if (ret != LTTNG_OK) { |
| 177 | ERR("Failed to get the list of triggers."); |
| 178 | goto error; |
| 179 | } |
| 180 | |
| 181 | trigger_status = lttng_triggers_get_count(triggers, &triggers_count); |
| 182 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 183 | |
| 184 | for (i = 0; i < triggers_count; i++) { |
| 185 | const struct lttng_trigger *trigger; |
| 186 | const char *trigger_name; |
| 187 | uid_t trigger_uid; |
| 188 | |
| 189 | trigger = lttng_triggers_get_at_index(triggers, i); |
| 190 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); |
| 191 | switch (trigger_status) { |
| 192 | case LTTNG_TRIGGER_STATUS_OK: |
| 193 | break; |
| 194 | case LTTNG_TRIGGER_STATUS_UNSET: |
| 195 | /* Don't compare against anonymous triggers. */ |
| 196 | continue; |
| 197 | default: |
| 198 | abort(); |
| 199 | } |
| 200 | |
| 201 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_uid); |
| 202 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 203 | |
| 204 | if (trigger_uid == uid && strcmp(trigger_name, name) == 0) { |
| 205 | trigger_to_remove = trigger; |
| 206 | break; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | if (!trigger_to_remove) { |
| 211 | ERR("Couldn't find trigger with name `%s`.", name); |
| 212 | goto error; |
| 213 | } |
| 214 | |
| 215 | ret = lttng_unregister_trigger(trigger_to_remove); |
| 216 | if (ret != 0) { |
| 217 | ERR("Failed to unregister trigger `%s`.", name); |
| 218 | goto error; |
| 219 | } |
| 220 | |
| 221 | if (lttng_opt_mi) { |
| 222 | ret_code = lttng_trigger_mi_serialize(trigger_to_remove, mi_writer, nullptr); |
| 223 | if (ret_code != LTTNG_OK) { |
| 224 | goto error; |
| 225 | } |
| 226 | } |
| 227 | MSG("Removed trigger `%s`.", name); |
| 228 | |
| 229 | ret = 0; |
| 230 | goto end; |
| 231 | |
| 232 | error: |
| 233 | ret = 1; |
| 234 | |
| 235 | end: |
| 236 | /* Mi closing. */ |
| 237 | if (lttng_opt_mi && mi_writer) { |
| 238 | /* Close output element. */ |
| 239 | int mi_ret = mi_lttng_writer_close_element(mi_writer); |
| 240 | if (mi_ret) { |
| 241 | ret = 1; |
| 242 | goto cleanup; |
| 243 | } |
| 244 | |
| 245 | mi_ret = mi_lttng_writer_write_element_bool( |
| 246 | mi_writer, mi_lttng_element_command_success, ret ? 0 : 1); |
| 247 | if (mi_ret) { |
| 248 | ret = 1; |
| 249 | goto cleanup; |
| 250 | } |
| 251 | |
| 252 | /* Command element close. */ |
| 253 | mi_ret = mi_lttng_writer_command_close(mi_writer); |
| 254 | if (mi_ret) { |
| 255 | ret = 1; |
| 256 | goto cleanup; |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | cleanup: |
| 261 | argpar_item_destroy(argpar_item); |
| 262 | argpar_iter_destroy(argpar_iter); |
| 263 | lttng_triggers_destroy(triggers); |
| 264 | free(owner_uid); |
| 265 | |
| 266 | if (mi_writer && mi_lttng_writer_destroy(mi_writer)) { |
| 267 | /* Preserve original error code. */ |
| 268 | ret = ret ? ret : CMD_ERROR; |
| 269 | } |
| 270 | return ret; |
| 271 | } |