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 fprintf(f, " param:\t\"%s\"", ap->name); 69 fprintf(f, " [%s%s", 70 ap->flag & GCTL_PARAM_RD ? "R" : "", 71 ap->flag & GCTL_PARAM_WR ? "W" : ""); 72 fflush(f); 73 if (ap->flag & GCTL_PARAM_ASCII) 74 fprintf(f, "%d] = \"%s\"", ap->len, (char *)ap->value); 75 else if (ap->len > 0) { 76 fprintf(f, "%d] = ", ap->len); 77 fflush(f); 78 for (j = 0; j < ap->len; j++) { 79 fprintf(f, " %02x", ((u_char *)ap->value)[j]); 80 } 81 } else { 82 fprintf(f, "0] = %p", ap->value); 83 } 84 fprintf(f, "\n"); 85 } 86 } 87 88 /* 89 * Set an error message, if one does not already exist. 90 */ 91 static void 92 gctl_set_error(struct gctl_req *req, const char *error, ...) 93 { 94 va_list ap; 95 96 if (req->error != NULL) 97 return; 98 va_start(ap, error); 99 vasprintf(&req->error, error, ap); 100 va_end(ap); 101 } 102 103 /* 104 * Check that a malloc operation succeeded, and set a consistent error 105 * message if not. 106 */ 107 static void 108 gctl_check_alloc(struct gctl_req *req, void *ptr) 109 { 110 if (ptr != NULL) 111 return; 112 gctl_set_error(req, "Could not allocate memory"); 113 if (req->error == NULL) 114 req->error = "Could not allocate memory"; 115 } 116 117 /* 118 * Allocate a new request handle of the specified type. 119 * XXX: Why bother checking the type ? 120 */ 121 struct gctl_req * 122 gctl_get_handle(enum gctl_request req) 123 { 124 struct gctl_req_table *gtp; 125 struct gctl_req *rp; 126 127 rp = calloc(1, sizeof *rp); 128 if (rp == NULL) 129 return (NULL); 130 for (gtp = gcrt; gtp->request != req; gtp++) 131 if (gtp->request == GCTL_INVALID_REQUEST) 132 break; 133 134 rp->request = req; 135 rp->reqt = gtp; 136 if (rp->reqt->request == GCTL_INVALID_REQUEST) 137 gctl_set_error(rp, "Invalid request"); 138 return (rp); 139 } 140 141 /* 142 * Allocate space for another argument. 143 */ 144 static struct gctl_req_arg * 145 gctl_new_arg(struct gctl_req *req) 146 { 147 struct gctl_req_arg *ap; 148 149 req->narg++; 150 req->arg = realloc(req->arg, sizeof *ap * req->narg); 151 gctl_check_alloc(req, req->arg); 152 if (req->arg == NULL) { 153 req->narg = 0; 154 return (NULL); 155 } 156 ap = req->arg + (req->narg - 1); 157 memset(ap, 0, sizeof *ap); 158 return (ap); 159 } 160 161 void 162 gctl_ro_param(struct gctl_req *req, const char *name, int len, const void* value) 163 { 164 struct gctl_req_arg *ap; 165 166 if (req == NULL || req->error != NULL) 167 return; 168 ap = gctl_new_arg(req); 169 if (ap == NULL) 170 return; 171 ap->name = strdup(name); 172 gctl_check_alloc(req, ap->name); 173 ap->nlen = strlen(ap->name) + 1; 174 ap->value = __DECONST(void *, value); 175 ap->flag = GCTL_PARAM_RD; 176 if (len >= 0) 177 ap->len = len; 178 else if (len < 0) { 179 ap->flag |= GCTL_PARAM_ASCII; 180 ap->len = strlen(value) + 1; 181 } 182 } 183 184 void 185 gctl_rw_param(struct gctl_req *req, const char *name, int len, void* value) 186 { 187 struct gctl_req_arg *ap; 188 189 if (req == NULL || req->error != NULL) 190 return; 191 ap = gctl_new_arg(req); 192 if (ap == NULL) 193 return; 194 ap->name = strdup(name); 195 gctl_check_alloc(req, ap->name); 196 ap->nlen = strlen(ap->name) + 1; 197 ap->value = value; 198 ap->flag = GCTL_PARAM_RW; 199 if (len >= 0) 200 ap->len = len; 201 else if (len < 0) 202 ap->len = strlen(value) + 1; 203 } 204 205 const char * 206 gctl_issue(struct gctl_req *req) 207 { 208 int fd, error; 209 210 if (req == NULL) 211 return ("NULL request pointer"); 212 if (req->error != NULL) 213 return (req->error); 214 215 req->version = GCTL_VERSION; 216 req->lerror = BUFSIZ; /* XXX: arbitrary number */ 217 req->error = malloc(req->lerror); 218 if (req->error == NULL) { 219 gctl_check_alloc(req, req->error); 220 return (req->error); 221 } 222 memset(req->error, 0, req->lerror); 223 req->lerror--; 224 fd = open(_PATH_DEV PATH_GEOM_CTL, O_RDONLY); 225 if (fd < 0) 226 return(strerror(errno)); 227 error = ioctl(fd, GEOM_CTL, req); 228 close(fd); 229 if (req->error[0] != '\0') 230 return (req->error); 231 if (error != 0) 232 return(strerror(errno)); 233 return (NULL); 234 } 235 236 void 237 gctl_free(struct gctl_req *req) 238 { 239 u_int i; 240 241 if (req == NULL) 242 return; 243 for (i = 0; i < req->narg; i++) { 244 if (req->arg[i].name != NULL) 245 free(req->arg[i].name); 246 } 247 free(req->arg); 248 if (req->error != NULL) 249 free(req->error); 250 free(req); 251 } 252