1 /*- 2 * Copyright (c) 2003 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The names of the authors may not be used to endorse or promote 14 * products derived from this software without specific prior written 15 * permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <stdio.h> 33 #include <fcntl.h> 34 #include <errno.h> 35 #include <stdint.h> 36 #include <sys/types.h> 37 #include <stdarg.h> 38 #include <unistd.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <paths.h> 42 43 #include <sys/queue.h> 44 45 #define GCTL_TABLE 1 46 #include <libgeom.h> 47 48 #include <geom/geom_ext.h> 49 50 void 51 gctl_dump(struct gctl_req *req, FILE *f) 52 { 53 u_int i; 54 int j; 55 struct gctl_req_arg *ap; 56 57 if (req == NULL) { 58 fprintf(f, "Dump of gctl request at NULL\n"); 59 return; 60 } 61 fprintf(f, "Dump of gctl %s request at %p:\n", req->reqt->name, req); 62 if (req->error != NULL) 63 fprintf(f, " error:\t\"%s\"\n", req->error); 64 else 65 fprintf(f, " error:\tNULL\n"); 66 for (i = 0; i < req->narg; i++) { 67 ap = &req->arg[i]; 68 if (ap->name != NULL) 69 fprintf(f, " param:\t\"%s\"", ap->name); 70 else 71 fprintf(f, " meta:\t@%jd", (intmax_t)ap->offset); 72 fprintf(f, " [%s%s", 73 ap->flag & GCTL_PARAM_RD ? "R" : "", 74 ap->flag & GCTL_PARAM_WR ? "W" : ""); 75 fflush(f); 76 if (ap->flag & GCTL_PARAM_ASCII) 77 fprintf(f, "%d] = \"%s\"", ap->len, (char *)ap->value); 78 else if (ap->len > 0) { 79 fprintf(f, "%d] = ", ap->len); 80 fflush(f); 81 for (j = 0; j < ap->len; j++) { 82 fprintf(f, " %02x", ((u_char *)ap->value)[j]); 83 } 84 } else { 85 fprintf(f, "0] = %p", ap->value); 86 } 87 fprintf(f, "\n"); 88 } 89 } 90 91 /* 92 * Set an error message, if one does not already exist. 93 */ 94 static void 95 gctl_set_error(struct gctl_req *req, const char *error, ...) 96 { 97 va_list ap; 98 99 if (req->error != NULL) 100 return; 101 va_start(ap, error); 102 vasprintf(&req->error, error, ap); 103 va_end(ap); 104 } 105 106 /* 107 * Check that a malloc operation succeeded, and set a consistent error 108 * message if not. 109 */ 110 static void 111 gctl_check_alloc(struct gctl_req *req, void *ptr) 112 { 113 if (ptr != NULL) 114 return; 115 gctl_set_error(req, "Could not allocate memory"); 116 if (req->error == NULL) 117 req->error = "Could not allocate memory"; 118 } 119 120 /* 121 * Allocate a new request handle of the specified type. 122 * XXX: Why bother checking the type ? 123 */ 124 struct gctl_req * 125 gctl_get_handle(enum gctl_request req) 126 { 127 struct gctl_req_table *gtp; 128 struct gctl_req *rp; 129 130 rp = calloc(1, sizeof *rp); 131 if (rp == NULL) 132 return (NULL); 133 for (gtp = gcrt; gtp->request != req; gtp++) 134 if (gtp->request == GCTL_INVALID_REQUEST) 135 break; 136 137 rp->request = req; 138 rp->reqt = gtp; 139 if (rp->reqt->request == GCTL_INVALID_REQUEST) 140 gctl_set_error(rp, "Invalid request"); 141 return (rp); 142 } 143 144 /* 145 * Allocate space for another argument. 146 */ 147 static struct gctl_req_arg * 148 gctl_new_arg(struct gctl_req *req) 149 { 150 struct gctl_req_arg *ap; 151 152 req->narg++; 153 req->arg = realloc(req->arg, sizeof *ap * req->narg); 154 gctl_check_alloc(req, req->arg); 155 if (req->arg == NULL) { 156 req->narg = 0; 157 return (NULL); 158 } 159 ap = req->arg + (req->narg - 1); 160 memset(ap, 0, sizeof *ap); 161 return (ap); 162 } 163 164 void 165 gctl_ro_param(struct gctl_req *req, const char *name, int len, const void* value) 166 { 167 struct gctl_req_arg *ap; 168 169 if (req == NULL || req->error != NULL) 170 return; 171 ap = gctl_new_arg(req); 172 if (ap == NULL) 173 return; 174 ap->name = strdup(name); 175 gctl_check_alloc(req, ap->name); 176 ap->nlen = strlen(ap->name) + 1; 177 ap->value = __DECONST(void *, value); 178 ap->flag = GCTL_PARAM_RD; 179 if (len >= 0) 180 ap->len = len; 181 else if (len < 0) { 182 ap->flag |= GCTL_PARAM_ASCII; 183 ap->len = strlen(value) + 1; 184 } 185 } 186 187 void 188 gctl_rw_param(struct gctl_req *req, const char *name, int len, void* value) 189 { 190 struct gctl_req_arg *ap; 191 192 if (req == NULL || req->error != NULL) 193 return; 194 ap = gctl_new_arg(req); 195 if (ap == NULL) 196 return; 197 ap->name = strdup(name); 198 gctl_check_alloc(req, ap->name); 199 ap->nlen = strlen(ap->name) + 1; 200 ap->value = value; 201 ap->flag = GCTL_PARAM_RW; 202 if (len >= 0) 203 ap->len = len; 204 else if (len < 0) 205 ap->len = strlen(value) + 1; 206 } 207 208 void 209 gctl_ro_meta(struct gctl_req *req, off_t offset, u_int len, const void* value) 210 { 211 struct gctl_req_arg *ap; 212 213 if (req == NULL || req->error != NULL) 214 return; 215 ap = gctl_new_arg(req); 216 if (ap == NULL) 217 return; 218 ap->value = __DECONST(void *, value); 219 ap->flag = GCTL_PARAM_RD; 220 ap->offset = offset; 221 ap->len = len; 222 } 223 224 void 225 gctl_rw_meta(struct gctl_req *req, off_t offset, u_int len, void* value) 226 { 227 struct gctl_req_arg *ap; 228 229 if (req == NULL || req->error != NULL) 230 return; 231 ap = gctl_new_arg(req); 232 if (ap == NULL) 233 return; 234 ap->value = value; 235 ap->flag = GCTL_PARAM_RW; 236 ap->offset = offset; 237 ap->len = len; 238 } 239 240 const char * 241 gctl_issue(struct gctl_req *req) 242 { 243 int fd, error; 244 245 if (req == NULL) 246 return ("NULL request pointer"); 247 if (req->error != NULL) 248 return (req->error); 249 250 req->version = GCTL_VERSION; 251 req->lerror = BUFSIZ; /* XXX: arbitrary number */ 252 req->error = malloc(req->lerror); 253 if (req->error == NULL) { 254 gctl_check_alloc(req, req->error); 255 return (req->error); 256 } 257 memset(req->error, 0, req->lerror); 258 req->lerror--; 259 fd = open(_PATH_DEV PATH_GEOM_CTL, O_RDONLY); 260 if (fd < 0) 261 return(strerror(errno)); 262 error = ioctl(fd, GEOM_CTL, req); 263 close(fd); 264 if (req->error[0] != '\0') 265 return (req->error); 266 if (error != 0) 267 return(strerror(errno)); 268 return (NULL); 269 } 270 271 void 272 gctl_free(struct gctl_req *req) 273 { 274 u_int i; 275 276 if (req == NULL) 277 return; 278 for (i = 0; i < req->narg; i++) { 279 if (req->arg[i].name != NULL) 280 free(req->arg[i].name); 281 } 282 free(req->arg); 283 if (req->error != NULL) 284 free(req->error); 285 free(req); 286 } 287