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 /* 49 * Global pointer to a string that is used to avoid an errorneous free in 50 * gctl_free. 51 */ 52 static char nomemmsg[] = "Could not allocate memory"; 53 54 void 55 gctl_dump(struct gctl_req *req, FILE *f) 56 { 57 unsigned int i; 58 int j; 59 struct gctl_req_arg *ap; 60 61 if (req == NULL) { 62 fprintf(f, "Dump of gctl request at NULL\n"); 63 return; 64 } 65 fprintf(f, "Dump of gctl request at %p:\n", req); 66 if (req->error != NULL) 67 fprintf(f, " error:\t\"%s\"\n", req->error); 68 else 69 fprintf(f, " error:\tNULL\n"); 70 for (i = 0; i < req->narg; i++) { 71 ap = &req->arg[i]; 72 fprintf(f, " param:\t\"%s\" (%d)", ap->name, ap->nlen); 73 fprintf(f, " [%s%s", 74 ap->flag & GCTL_PARAM_RD ? "R" : "", 75 ap->flag & GCTL_PARAM_WR ? "W" : ""); 76 fflush(f); 77 if (ap->flag & GCTL_PARAM_ASCII) 78 fprintf(f, "%d] = \"%s\"", ap->len, (char *)ap->value); 79 else if (ap->len > 0) { 80 fprintf(f, "%d] = ", ap->len); 81 fflush(f); 82 for (j = 0; j < ap->len; j++) { 83 fprintf(f, " %02x", ((u_char *)ap->value)[j]); 84 } 85 } else { 86 fprintf(f, "0] = %p", ap->value); 87 } 88 fprintf(f, "\n"); 89 } 90 } 91 92 /* 93 * Set an error message, if one does not already exist. 94 */ 95 static void 96 gctl_set_error(struct gctl_req *req, const char *error, ...) 97 { 98 va_list ap; 99 100 if (req->error != NULL) 101 return; 102 va_start(ap, error); 103 vasprintf(&req->error, error, ap); 104 va_end(ap); 105 } 106 107 /* 108 * Check that a malloc operation succeeded, and set a consistent error 109 * message if not. 110 */ 111 static void 112 gctl_check_alloc(struct gctl_req *req, void *ptr) 113 { 114 115 if (ptr != NULL) 116 return; 117 gctl_set_error(req, nomemmsg); 118 if (req->error == NULL) 119 req->error = nomemmsg; 120 } 121 122 /* 123 * Allocate a new request handle of the specified type. 124 * XXX: Why bother checking the type ? 125 */ 126 struct gctl_req * 127 gctl_get_handle(void) 128 { 129 130 return (calloc(1, sizeof(struct gctl_req))); 131 } 132 133 /* 134 * Allocate space for another argument. 135 */ 136 static struct gctl_req_arg * 137 gctl_new_arg(struct gctl_req *req) 138 { 139 struct gctl_req_arg *ap; 140 141 req->narg++; 142 req->arg = reallocf(req->arg, sizeof *ap * req->narg); 143 gctl_check_alloc(req, req->arg); 144 if (req->arg == NULL) { 145 req->narg = 0; 146 return (NULL); 147 } 148 ap = req->arg + (req->narg - 1); 149 memset(ap, 0, sizeof *ap); 150 return (ap); 151 } 152 153 static void 154 gctl_param_add(struct gctl_req *req, const char *name, int len, void *value, 155 int flag) 156 { 157 struct gctl_req_arg *ap; 158 159 if (req == NULL || req->error != NULL) 160 return; 161 ap = gctl_new_arg(req); 162 if (ap == NULL) 163 return; 164 ap->name = strdup(name); 165 gctl_check_alloc(req, ap->name); 166 if (ap->name == NULL) 167 return; 168 ap->nlen = strlen(ap->name) + 1; 169 ap->value = value; 170 ap->flag = flag; 171 if (len >= 0) 172 ap->len = len; 173 else if (len < 0) { 174 ap->flag |= GCTL_PARAM_ASCII; 175 ap->len = strlen(value) + 1; 176 } 177 } 178 179 void 180 gctl_ro_param(struct gctl_req *req, const char *name, int len, const void* value) 181 { 182 183 gctl_param_add(req, name, len, __DECONST(void *, value), GCTL_PARAM_RD); 184 } 185 186 void 187 gctl_rw_param(struct gctl_req *req, const char *name, int len, void *value) 188 { 189 190 gctl_param_add(req, name, len, value, GCTL_PARAM_RW); 191 } 192 193 const char * 194 gctl_issue(struct gctl_req *req) 195 { 196 int fd, error; 197 198 if (req == NULL) 199 return ("NULL request pointer"); 200 if (req->error != NULL) 201 return (req->error); 202 203 req->version = GCTL_VERSION; 204 req->lerror = BUFSIZ; /* XXX: arbitrary number */ 205 req->error = calloc(1, req->lerror); 206 if (req->error == NULL) { 207 gctl_check_alloc(req, req->error); 208 return (req->error); 209 } 210 req->lerror--; 211 fd = open(_PATH_DEV PATH_GEOM_CTL, O_RDONLY); 212 if (fd < 0) 213 return(strerror(errno)); 214 error = ioctl(fd, GEOM_CTL, req); 215 close(fd); 216 if (req->error[0] != '\0') 217 return (req->error); 218 if (error != 0) 219 return(strerror(errno)); 220 return (NULL); 221 } 222 223 void 224 gctl_free(struct gctl_req *req) 225 { 226 unsigned int i; 227 228 if (req == NULL) 229 return; 230 for (i = 0; i < req->narg; i++) { 231 if (req->arg[i].name != NULL) 232 free(req->arg[i].name); 233 } 234 free(req->arg); 235 if (req->error != NULL && req->error != nomemmsg) 236 free(req->error); 237 free(req); 238 } 239