| 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 <lttng/lttng.h> |
| 11 | #include <stdio.h> |
| 12 | |
| 13 | #ifdef LTTNG_EMBED_HELP |
| 14 | static const char help_msg[] = |
| 15 | #include <lttng-remove-trigger.1.h> |
| 16 | ; |
| 17 | #endif |
| 18 | |
| 19 | enum { |
| 20 | OPT_HELP, |
| 21 | OPT_LIST_OPTIONS, |
| 22 | OPT_OWNER_UID, |
| 23 | }; |
| 24 | |
| 25 | static const |
| 26 | struct argpar_opt_descr remove_trigger_options[] = { |
| 27 | { OPT_HELP, 'h', "help", false }, |
| 28 | { OPT_LIST_OPTIONS, '\0', "list-options", false }, |
| 29 | { OPT_OWNER_UID, '\0', "owner-uid", true }, |
| 30 | ARGPAR_OPT_DESCR_SENTINEL, |
| 31 | }; |
| 32 | |
| 33 | static |
| 34 | bool assign_string(char **dest, const char *src, const char *opt_name) |
| 35 | { |
| 36 | bool ret; |
| 37 | |
| 38 | if (*dest) { |
| 39 | ERR("Duplicate option '%s' given.", opt_name); |
| 40 | goto error; |
| 41 | } |
| 42 | |
| 43 | *dest = strdup(src); |
| 44 | if (!*dest) { |
| 45 | ERR("Failed to allocate '%s' string.", opt_name); |
| 46 | goto error; |
| 47 | } |
| 48 | |
| 49 | ret = true; |
| 50 | goto end; |
| 51 | |
| 52 | error: |
| 53 | ret = false; |
| 54 | |
| 55 | end: |
| 56 | return ret; |
| 57 | } |
| 58 | |
| 59 | int cmd_remove_trigger(int argc, const char **argv) |
| 60 | { |
| 61 | int ret; |
| 62 | struct argpar_parse_ret argpar_parse_ret = {}; |
| 63 | const char *id = NULL; |
| 64 | int i; |
| 65 | struct lttng_triggers *triggers = NULL; |
| 66 | unsigned int triggers_count; |
| 67 | enum lttng_trigger_status trigger_status; |
| 68 | const struct lttng_trigger *trigger_to_remove = NULL; |
| 69 | char *owner_uid = NULL; |
| 70 | long long uid; |
| 71 | |
| 72 | argpar_parse_ret = argpar_parse(argc - 1, argv + 1, |
| 73 | remove_trigger_options, true); |
| 74 | if (!argpar_parse_ret.items) { |
| 75 | ERR("%s", argpar_parse_ret.error); |
| 76 | goto error; |
| 77 | } |
| 78 | |
| 79 | for (i = 0; i < argpar_parse_ret.items->n_items; i++) { |
| 80 | const struct argpar_item *item = |
| 81 | argpar_parse_ret.items->items[i]; |
| 82 | |
| 83 | if (item->type == ARGPAR_ITEM_TYPE_OPT) { |
| 84 | const struct argpar_item_opt *item_opt = |
| 85 | (const struct argpar_item_opt *) item; |
| 86 | |
| 87 | switch (item_opt->descr->id) { |
| 88 | case OPT_HELP: |
| 89 | SHOW_HELP(); |
| 90 | ret = 0; |
| 91 | goto end; |
| 92 | case OPT_LIST_OPTIONS: |
| 93 | list_cmd_options_argpar(stdout, |
| 94 | remove_trigger_options); |
| 95 | ret = 0; |
| 96 | goto end; |
| 97 | case OPT_OWNER_UID: |
| 98 | { |
| 99 | if (!assign_string(&owner_uid, item_opt->arg, |
| 100 | "--owner-uid")) { |
| 101 | goto error; |
| 102 | } |
| 103 | break; |
| 104 | } |
| 105 | default: |
| 106 | abort(); |
| 107 | } |
| 108 | } else { |
| 109 | const struct argpar_item_non_opt *item_non_opt = |
| 110 | (const struct argpar_item_non_opt *) item; |
| 111 | |
| 112 | if (id) { |
| 113 | ERR("Unexpected argument '%s'", item_non_opt->arg); |
| 114 | goto error; |
| 115 | } |
| 116 | |
| 117 | id = item_non_opt->arg; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | if (!id) { |
| 122 | ERR("Missing `id` argument."); |
| 123 | goto error; |
| 124 | } |
| 125 | |
| 126 | if (owner_uid) { |
| 127 | char *end; |
| 128 | |
| 129 | errno = 0; |
| 130 | uid = strtol(owner_uid, &end, 10); |
| 131 | if (end == owner_uid || *end != '\0' || errno != 0) { |
| 132 | ERR("Failed to parse `%s` as an integer.", owner_uid); |
| 133 | } |
| 134 | } else { |
| 135 | uid = geteuid(); |
| 136 | } |
| 137 | |
| 138 | ret = lttng_list_triggers(&triggers); |
| 139 | if (ret != LTTNG_OK) { |
| 140 | ERR("Failed to get the list of triggers."); |
| 141 | goto error; |
| 142 | } |
| 143 | |
| 144 | trigger_status = lttng_triggers_get_count(triggers, &triggers_count); |
| 145 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 146 | |
| 147 | for (i = 0; i < triggers_count; i++) { |
| 148 | const struct lttng_trigger *trigger; |
| 149 | const char *trigger_name; |
| 150 | uid_t trigger_uid; |
| 151 | |
| 152 | trigger = lttng_triggers_get_at_index(triggers, i); |
| 153 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); |
| 154 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 155 | |
| 156 | trigger_status = lttng_trigger_get_owner_uid( |
| 157 | trigger, &trigger_uid); |
| 158 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 159 | |
| 160 | if (trigger_uid == uid && strcmp(trigger_name, id) == 0) { |
| 161 | trigger_to_remove = trigger; |
| 162 | break; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | if (!trigger_to_remove) { |
| 167 | ERR("Couldn't find trigger with id `%s`.", id); |
| 168 | goto error; |
| 169 | } |
| 170 | |
| 171 | ret = lttng_unregister_trigger(trigger_to_remove); |
| 172 | if (ret != 0) { |
| 173 | ERR("Failed to unregister trigger `%s`.", id); |
| 174 | goto error; |
| 175 | } |
| 176 | |
| 177 | MSG("Removed trigger `%s`.", id); |
| 178 | |
| 179 | ret = 0; |
| 180 | goto end; |
| 181 | |
| 182 | error: |
| 183 | ret = 1; |
| 184 | |
| 185 | end: |
| 186 | argpar_parse_ret_fini(&argpar_parse_ret); |
| 187 | lttng_triggers_destroy(triggers); |
| 188 | free(owner_uid); |
| 189 | |
| 190 | return ret; |
| 191 | } |