1 /* 2 * Copyright (c) 2009, Sun Microsystems, Inc. 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 are met: 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * - Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * - Neither the name of Sun Microsystems, Inc. nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 //#include <sys/cdefs.h> 29 30 /* 31 * Copyright (c) 1989 by Sun Microsystems, Inc. 32 */ 33 34 //#include <sys/cdefs.h> 35 #include <wintirpc.h> 36 #include <stdio.h> 37 #include <errno.h> 38 #include <netconfig.h> 39 #include <stdlib.h> 40 #include <string.h> 41 //#include <syslog.h> 42 43 /* 44 * internal structure to keep track of a netpath "session" 45 */ 46 struct netpath_chain { 47 struct netconfig *ncp; /* an nconf entry */ 48 struct netpath_chain *nchain_next; /* next nconf entry allocated */ 49 }; 50 51 52 struct netpath_vars { 53 int valid; /* token that indicates a valid netpath_vars */ 54 void *nc_handlep; /* handle for current netconfig "session" */ 55 char *netpath; /* pointer to current view-point in NETPATH */ 56 char *netpath_start; /* pointer to start of our copy of NETPATH */ 57 struct netpath_chain *ncp_list; /* list of nconfs allocated this session*/ 58 }; 59 60 #define NP_VALID 0xf00d 61 #define NP_INVALID 0 62 63 char *_get_next_token(char *, int); 64 65 66 /* 67 * A call to setnetpath() establishes a NETPATH "session". setnetpath() 68 * must be called before the first call to getnetpath(). A "handle" is 69 * returned to distinguish the session; this handle should be passed 70 * subsequently to getnetpath(). (Handles are used to allow for nested calls 71 * to setnetpath()). 72 * If setnetpath() is unable to establish a session (due to lack of memory 73 * resources, or the absence of the /etc/netconfig file), a NULL pointer is 74 * returned. 75 */ 76 77 void * 78 setnetpath() 79 { 80 81 struct netpath_vars *np_sessionp; /* this session's variables */ 82 char *npp; /* NETPATH env variable */ 83 84 #ifdef MEM_CHK 85 malloc_debug(1); 86 #endif 87 88 if ((np_sessionp = 89 (struct netpath_vars *)malloc(sizeof (struct netpath_vars))) == NULL) { 90 return (NULL); 91 } 92 if ((np_sessionp->nc_handlep = setnetconfig()) == NULL) { 93 //syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 94 return (NULL); 95 } 96 np_sessionp->valid = NP_VALID; 97 np_sessionp->ncp_list = NULL; 98 if ((npp = getenv(NETPATH)) == NULL) { 99 np_sessionp->netpath = NULL; 100 } else { 101 (void) endnetconfig(np_sessionp->nc_handlep);/* won't need nc session*/ 102 np_sessionp->nc_handlep = NULL; 103 if ((np_sessionp->netpath = malloc(strlen(npp)+1)) == NULL) { 104 free(np_sessionp); 105 return (NULL); 106 } else { 107 (void) strcpy(np_sessionp->netpath, npp); 108 } 109 } 110 np_sessionp->netpath_start = np_sessionp->netpath; 111 return ((void *)np_sessionp); 112 } 113 114 /* 115 * When first called, getnetpath() returns a pointer to the netconfig 116 * database entry corresponding to the first valid NETPATH component. The 117 * netconfig entry is formatted as a struct netconfig. 118 * On each subsequent call, getnetpath returns a pointer to the netconfig 119 * entry that corresponds to the next valid NETPATH component. getnetpath 120 * can thus be used to search the netconfig database for all networks 121 * included in the NETPATH variable. 122 * When NETPATH has been exhausted, getnetpath() returns NULL. It returns 123 * NULL and sets errno in case of an error (e.g., setnetpath was not called 124 * previously). 125 * getnetpath() silently ignores invalid NETPATH components. A NETPATH 126 * compnent is invalid if there is no corresponding entry in the netconfig 127 * database. 128 * If the NETPATH variable is unset, getnetpath() behaves as if NETPATH 129 * were set to the sequence of default or visible networks in the netconfig 130 * database, in the order in which they are listed. 131 */ 132 133 struct netconfig * 134 getnetpath(handlep) 135 void *handlep; 136 { 137 struct netpath_vars *np_sessionp = (struct netpath_vars *)handlep; 138 struct netconfig *ncp = NULL; /* temp. holds a netconfig session */ 139 struct netpath_chain *chainp; /* holds chain of ncp's we alloc */ 140 char *npp; /* holds current NETPATH */ 141 142 if (np_sessionp == NULL || np_sessionp->valid != NP_VALID) { 143 errno = EINVAL; 144 return (NULL); 145 } 146 if (np_sessionp->netpath_start == NULL) { /* NETPATH was not set */ 147 do { /* select next visible network */ 148 if (np_sessionp->nc_handlep == NULL) { 149 np_sessionp->nc_handlep = setnetconfig(); 150 if (np_sessionp->nc_handlep == NULL) { 151 //syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 152 } 153 } 154 if ((ncp = getnetconfig(np_sessionp->nc_handlep)) == NULL) { 155 return(NULL); 156 } 157 } while ((ncp->nc_flag & NC_VISIBLE) == 0); 158 return (ncp); 159 } 160 /* 161 * Find first valid network ID in netpath. 162 */ 163 while ((npp = np_sessionp->netpath) != NULL && strlen(npp) != 0) { 164 np_sessionp->netpath = _get_next_token(npp, ':'); 165 /* 166 * npp is a network identifier. 167 */ 168 if ((ncp = getnetconfigent(npp)) != NULL) { 169 chainp = (struct netpath_chain *) /* cobble alloc chain entry */ 170 malloc(sizeof (struct netpath_chain)); 171 chainp->ncp = ncp; 172 chainp->nchain_next = NULL; 173 if (np_sessionp->ncp_list == NULL) { 174 np_sessionp->ncp_list = chainp; 175 } else { 176 np_sessionp->ncp_list->nchain_next = chainp; 177 } 178 return (ncp); 179 } 180 /* couldn't find this token in the database; go to next one. */ 181 } 182 return (NULL); 183 } 184 185 /* 186 * endnetpath() may be called to unbind NETPATH when processing is complete, 187 * releasing resources for reuse. It returns 0 on success and -1 on failure 188 * (e.g. if setnetpath() was not called previously. 189 */ 190 int 191 endnetpath(handlep) 192 void *handlep; 193 { 194 struct netpath_vars *np_sessionp = (struct netpath_vars *)handlep; 195 struct netpath_chain *chainp, *lastp; 196 197 if (np_sessionp == NULL || np_sessionp->valid != NP_VALID) { 198 errno = EINVAL; 199 return (-1); 200 } 201 if (np_sessionp->nc_handlep != NULL) 202 endnetconfig(np_sessionp->nc_handlep); 203 if (np_sessionp->netpath_start != NULL) 204 free(np_sessionp->netpath_start); 205 for (chainp = np_sessionp->ncp_list; chainp != NULL; 206 lastp=chainp, chainp=chainp->nchain_next, free(lastp)) { 207 freenetconfigent(chainp->ncp); 208 } 209 free(np_sessionp); 210 #ifdef MEM_CHK 211 if (malloc_verify() == 0) { 212 fprintf(stderr, "memory heap corrupted in endnetpath\n"); 213 exit(1); 214 } 215 #endif 216 return (0); 217 } 218 219 220 221 /* 222 * Returns pointer to the rest-of-the-string after the current token. 223 * The token itself starts at arg, and we null terminate it. We return NULL 224 * if either the arg is empty, or if this is the last token. 225 */ 226 227 char * 228 _get_next_token(npp, token) 229 char *npp; /* string */ 230 int token; /* char to parse string for */ 231 { 232 char *cp; /* char pointer */ 233 char *np; /* netpath pointer */ 234 char *ep; /* escape pointer */ 235 236 if ((cp = strchr(npp, token)) == NULL) { 237 return (NULL); 238 } 239 /* 240 * did find a token, but it might be escaped. 241 */ 242 if ((cp > npp) && (cp[-1] == '\\')) { 243 /* if slash was also escaped, carry on, otherwise find next token */ 244 if ((cp > npp + 1) && (cp[-2] != '\\')) { 245 /* shift r-o-s onto the escaped token */ 246 strcpy(&cp[-1], cp); /* XXX: overlapping string copy */ 247 /* 248 * Do a recursive call. 249 * We don't know how many escaped tokens there might be. 250 */ 251 return (_get_next_token(cp, token)); 252 } 253 } 254 255 *cp++ = '\0'; /* null-terminate token */ 256 /* get rid of any backslash escapes */ 257 ep = npp; 258 while ((np = strchr(ep, '\\')) != 0) { 259 if (np[1] == '\\') 260 np++; 261 strcpy(np, (ep = &np[1])); /* XXX: overlapping string copy */ 262 } 263 return (cp); /* return ptr to r-o-s */ 264 } 265