| 1 | /* Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public |
| 5 | * License as published by the Free Software Foundation; either |
| 6 | * version 2.1 of the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | */ |
| 17 | |
| 18 | #include <stdio.h> |
| 19 | #include <unistd.h> |
| 20 | #include <getopt.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <fcntl.h> |
| 23 | #include <string.h> |
| 24 | #include <dirent.h> |
| 25 | # |
| 26 | |
| 27 | #include "ustcomm.h" |
| 28 | #include "ustcmd.h" |
| 29 | |
| 30 | #define _GNU_SOURCE |
| 31 | |
| 32 | pid_t* ustcmd_get_online_pids(void) { |
| 33 | struct dirent* dirent; |
| 34 | DIR* dir; |
| 35 | char* ping_res; |
| 36 | |
| 37 | dir = opendir(SOCK_DIR); |
| 38 | if (!dir) { |
| 39 | return NULL; |
| 40 | } |
| 41 | |
| 42 | unsigned int ret_size = 1 * sizeof(pid_t), i = 0; |
| 43 | pid_t* ret = (pid_t*) malloc(ret_size); |
| 44 | |
| 45 | while (dirent = readdir(dir)) { |
| 46 | if (!strcmp(dirent->d_name, ".") || |
| 47 | !strcmp(dirent->d_name, "..")) { |
| 48 | |
| 49 | continue; |
| 50 | } |
| 51 | |
| 52 | if (dirent->d_type != DT_DIR && |
| 53 | !!strcmp(dirent->d_name, "ustd")) { |
| 54 | |
| 55 | sscanf(dirent->d_name, "%u", (unsigned int*) &ret[i]); |
| 56 | if (pid_is_online(ret[i])) { |
| 57 | ret_size += sizeof(pid_t); |
| 58 | ret = (pid_t*) realloc(ret, ret_size); |
| 59 | ++i; |
| 60 | } |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | ret[i] = 0; // Array end |
| 65 | |
| 66 | if (ret[0] == 0) { // No PID at all.. |
| 67 | free(ret); |
| 68 | return NULL; |
| 69 | } |
| 70 | |
| 71 | closedir(dir); |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Sets marker state (USTCMD_MS_ON or USTCMD_MS_OFF). |
| 77 | * |
| 78 | * @param mn Marker name |
| 79 | * @param state Marker's new state |
| 80 | * @param pid Traced process ID |
| 81 | * @return 0 if successful, or errors {USTCMD_ERR_GEN, USTCMD_ERR_ARG} |
| 82 | */ |
| 83 | int ustcmd_set_marker_state(const char* mn, int state, pid_t pid) { |
| 84 | if (mn == NULL) { |
| 85 | return USTCMD_ERR_ARG; |
| 86 | } |
| 87 | |
| 88 | char* cmd_str [] = {"disable_marker", "enable_marker"}; |
| 89 | char* cmd; |
| 90 | asprintf(&cmd, "%s %s", cmd_str[state], mn); |
| 91 | |
| 92 | int tres; |
| 93 | if (tres = ustcmd_shoot(cmd, pid, NULL)) { |
| 94 | free(cmd); |
| 95 | return USTCMD_ERR_GEN; |
| 96 | } |
| 97 | |
| 98 | free(cmd); |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Destroys an UST trace according to a PID. |
| 104 | * |
| 105 | * @param pid Traced process ID |
| 106 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 107 | */ |
| 108 | int ustcmd_destroy_trace(pid_t pid) { |
| 109 | int tres; |
| 110 | |
| 111 | if (tres = ustcmd_shoot("destroy", pid, NULL)) { |
| 112 | return USTCMD_ERR_GEN; |
| 113 | } |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Starts an UST trace (and setups it) according to a PID. |
| 120 | * |
| 121 | * @param pid Traced process ID |
| 122 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 123 | */ |
| 124 | int ustcmd_setup_and_start(pid_t pid) { |
| 125 | int tres; |
| 126 | |
| 127 | if (tres = ustcmd_shoot("start", pid, NULL)) { |
| 128 | return USTCMD_ERR_GEN; |
| 129 | } |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Starts an UST trace according to a PID. |
| 136 | * |
| 137 | * @param pid Traced process ID |
| 138 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 139 | */ |
| 140 | int ustcmd_start_trace(pid_t pid) { |
| 141 | int tres; |
| 142 | |
| 143 | if (tres = ustcmd_shoot("trace_start", pid, NULL)) { |
| 144 | return USTCMD_ERR_GEN; |
| 145 | } |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * Stops an UST trace according to a PID. |
| 152 | * |
| 153 | * @param pid Traced process ID |
| 154 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 155 | */ |
| 156 | int ustcmd_stop_trace(pid_t pid) { |
| 157 | int tres; |
| 158 | |
| 159 | if (tres = ustcmd_shoot("trace_stop", pid, NULL)) { |
| 160 | return USTCMD_ERR_GEN; |
| 161 | } |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Counts newlines ('\n') in a string. |
| 168 | * |
| 169 | * @param str String to search in |
| 170 | * @return Total newlines count |
| 171 | */ |
| 172 | unsigned int ustcmd_count_nl(const char* str) { |
| 173 | unsigned int i = 0, tot = 0; |
| 174 | |
| 175 | while (str[i] != '\0') { |
| 176 | if (str[i] == '\n') { |
| 177 | ++tot; |
| 178 | } |
| 179 | ++i; |
| 180 | } |
| 181 | |
| 182 | return tot; |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Frees a CMSF array. |
| 187 | * |
| 188 | * @param cmsf CMSF array to free |
| 189 | * @return 0 if successful, or error USTCMD_ERR_ARG |
| 190 | */ |
| 191 | int ustcmd_free_cmsf(struct USTcmd_cmsf* cmsf) { |
| 192 | if (cmsf == NULL) { |
| 193 | return USTCMD_ERR_ARG; |
| 194 | } |
| 195 | |
| 196 | unsigned int i = 0; |
| 197 | while (cmsf[i].channel != NULL) { |
| 198 | free(cmsf[i].channel); |
| 199 | free(cmsf[i].marker); |
| 200 | free(cmsf[i].fs); |
| 201 | ++i; |
| 202 | } |
| 203 | free(cmsf); |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Gets channel/marker/state/format string for a given PID. |
| 210 | * |
| 211 | * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller |
| 212 | * frees with `ustcmd_free_cmsf') |
| 213 | * @param pid Targeted PID |
| 214 | * @return 0 if successful, or errors {USTCMD_ERR_ARG, USTCMD_ERR_GEN} |
| 215 | */ |
| 216 | int ustcmd_get_cmsf(struct USTcmd_cmsf** cmsf, const pid_t pid) { |
| 217 | if (cmsf == NULL) { |
| 218 | return USTCMD_ERR_ARG; |
| 219 | } |
| 220 | char* big_str = NULL; |
| 221 | int tres; |
| 222 | |
| 223 | if (tres = ustcmd_shoot("list_markers", pid, &big_str)) { |
| 224 | return USTCMD_ERR_GEN; |
| 225 | } |
| 226 | |
| 227 | if (big_str == NULL) { |
| 228 | fprintf(stderr, "ustcmd: error while getting markers list\n"); |
| 229 | return USTCMD_ERR_GEN; |
| 230 | } |
| 231 | |
| 232 | struct USTcmd_cmsf* tmp_cmsf = NULL; |
| 233 | tmp_cmsf = (struct USTcmd_cmsf*) malloc(sizeof(struct USTcmd_cmsf) * |
| 234 | (ustcmd_count_nl(big_str) + 1)); |
| 235 | if (tmp_cmsf == NULL) { |
| 236 | return USTCMD_ERR_GEN; |
| 237 | } |
| 238 | |
| 239 | // Parse received reply string (format: "[chan]/[mark] [st] [fs]"): |
| 240 | unsigned int i = 0, cur_st, cmsf_ind = 0; |
| 241 | while (big_str[i] != '\0') { |
| 242 | /* RAW METHOD (REPLACED BY SSCANF): |
| 243 | cur_st = i; // Set current start at beginning of current line |
| 244 | while (big_str[i] != '/') { |
| 245 | ++i; // Go to next '/' |
| 246 | } |
| 247 | tmp_cmsf[cmsf_ind].channel = |
| 248 | strndup(big_str + cur_st, i - cur_st); |
| 249 | |
| 250 | ++i; // Go after '/' |
| 251 | cur_st = i; // Set current start at beginning of marker name |
| 252 | while (big_str[i] != ' ') { |
| 253 | ++i; // Go to next ' ' |
| 254 | } |
| 255 | tmp_cmsf[cmsf_ind].marker = |
| 256 | strndup(big_str + cur_st, i - cur_st); |
| 257 | |
| 258 | ++i; // Go after ' ' |
| 259 | tmp_cmsf[cmsf_ind].state = (big_str[i] == USTCMD_MS_CHR_ON ? |
| 260 | USTCMD_MS_ON : USTCMD_MS_OFF); // Marker state |
| 261 | |
| 262 | i += 2; // Go to format string (after state and another ' ') |
| 263 | cur_st = i; // Set current start at beginning of format string |
| 264 | while (big_str[i] != '\n') { |
| 265 | ++i; // Go to next '\n' |
| 266 | } |
| 267 | tmp_cmsf[cmsf_ind].fs = |
| 268 | strndup(big_str + cur_st, i - cur_st); |
| 269 | */ |
| 270 | |
| 271 | char state; |
| 272 | sscanf(big_str + i, "%a[^/]/%a[^ ] %c %a[^\n]", |
| 273 | &tmp_cmsf[cmsf_ind].channel, |
| 274 | &tmp_cmsf[cmsf_ind].marker, |
| 275 | &state, |
| 276 | &tmp_cmsf[cmsf_ind].fs); |
| 277 | tmp_cmsf[cmsf_ind].state = (state == USTCMD_MS_CHR_ON ? |
| 278 | USTCMD_MS_ON : USTCMD_MS_OFF); // Marker state |
| 279 | |
| 280 | while (big_str[i] != '\n') { |
| 281 | ++i; // Go to next '\n' |
| 282 | } |
| 283 | ++i; // Skip current pointed '\n' |
| 284 | ++cmsf_ind; |
| 285 | } |
| 286 | tmp_cmsf[cmsf_ind].channel = NULL; |
| 287 | tmp_cmsf[cmsf_ind].marker = NULL; |
| 288 | tmp_cmsf[cmsf_ind].fs = NULL; |
| 289 | |
| 290 | *cmsf = tmp_cmsf; |
| 291 | |
| 292 | free(big_str); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Shoots a given command using ustcomm. |
| 298 | * |
| 299 | * @param cmd Null-terminated command to shoot |
| 300 | * @param pid Targeted PID |
| 301 | * @param reply Pointer to string to be filled with a reply string (must |
| 302 | * be NULL if no reply is needed for the given command). |
| 303 | * @return 0 if successful, or errors {USTCMD_ERR_ARG, USTCMD_ERR_CONN} |
| 304 | */ |
| 305 | int ustcmd_shoot(const char* cmd, const pid_t pid, char** reply) { |
| 306 | if (cmd == NULL) { |
| 307 | return USTCMD_ERR_ARG; |
| 308 | } |
| 309 | |
| 310 | struct ustcomm_connection conn; |
| 311 | if (ustcomm_connect_app(pid, &conn)) { |
| 312 | fprintf(stderr, "ustcmd_shoot: could not connect to PID %u\n", |
| 313 | (unsigned int) pid); |
| 314 | return USTCMD_ERR_CONN; |
| 315 | } |
| 316 | |
| 317 | ustcomm_send_request(&conn, cmd, reply); |
| 318 | |
| 319 | return 0; |
| 320 | } |
| 321 | |