rquotad.c revision 1.2
1 /* 2 * by Manuel Bouyer (bouyer (at) ensta.fr) 3 * 4 * There is no copyright, you can use it as you want. 5 */ 6 7 #include <sys/param.h> 8 #include <sys/types.h> 9 #include <sys/mount.h> 10 #include <sys/file.h> 11 #include <sys/stat.h> 12 #include <sys/signal.h> 13 14 #include <stdio.h> 15 #include <fstab.h> 16 #include <ctype.h> 17 #include <stdlib.h> 18 #include <string.h> 19 #include <pwd.h> 20 #include <grp.h> 21 #include <errno.h> 22 23 #include <syslog.h> 24 #include <varargs.h> 25 26 #include <ufs/ufs/quota.h> 27 #include <rpc/rpc.h> 28 #include <rpcsvc/rquota.h> 29 #include <arpa/inet.h> 30 31 void rquota_svc __P((struct svc_req *request, SVCXPRT *transport)); 32 void exit_svc __P((int signo)); 33 void sendquota __P((struct svc_req *request, SVCXPRT *transport)); 34 void printerr_reply __P((SVCXPRT *transport)); 35 void initfs __P((void)); 36 int getfsquota __P((long id, char *path, struct dqblk *dqblk)); 37 int hasquota __P((struct fstab *fs, char **qfnamep)); 38 39 /* 40 * structure containing informations about ufs filesystems 41 * initialised by initfs() 42 */ 43 struct fs_stat { 44 struct fs_stat *fs_next; /* next element */ 45 char *fs_file; /* mount point of the filesystem */ 46 char *qfpathname; /* pathname of the quota file */ 47 dev_t st_dev; /* device of the filesystem */ 48 } fs_stat; 49 struct fs_stat *fs_begin = NULL; 50 51 int 52 main(argc, argv) 53 int argc; 54 char *argv[]; 55 { 56 SVCXPRT *transport; 57 int sock = 0; 58 int proto = 0; 59 int from_inetd = 1; 60 struct sockaddr_in from; 61 int fromlen; 62 63 openlog("rquotad", LOG_PID, LOG_DAEMON); 64 if (getsockname(0, (struct sockaddr *) & from, &fromlen) < 0) { 65 from_inetd = 0; 66 sock = RPC_ANYSOCK; 67 proto = IPPROTO_UDP; 68 } 69 if (!from_inetd) { 70 daemon(0, 0); 71 pmap_unset(RQUOTAPROG, RQUOTAVERS); 72 signal(SIGINT, exit_svc); /* trap some signals */ 73 signal(SIGQUIT, exit_svc); /* to unregister the service */ 74 signal(SIGTERM, exit_svc); /* before exiting */ 75 } 76 77 /* create and register the service */ 78 if ((transport = svcudp_create(sock)) == NULL) { 79 syslog(LOG_ERR, "couldn't create UDP transport"); 80 exit(1); 81 } 82 if (svc_register(transport, RQUOTAPROG, RQUOTAVERS, 83 rquota_svc, proto) == 0) { 84 syslog(LOG_ERR, "couldn't register service"); 85 exit(1); 86 } 87 initfs(); /* init the fs_stat list */ 88 svc_run(); 89 syslog(LOG_ERR, "svc_run has returned !"); 90 exit(1); /* svc_run don't return */ 91 } 92 93 /* rquota service */ 94 void 95 rquota_svc(request, transport) 96 struct svc_req *request; 97 SVCXPRT *transport; 98 { 99 switch (request->rq_proc) { 100 case NULLPROC: 101 errno = 0; 102 if (svc_sendreply(transport, xdr_void, 0) == 0) 103 printerr_reply(transport); 104 break; 105 case RQUOTAPROC_GETQUOTA: 106 case RQUOTAPROC_GETACTIVEQUOTA: 107 sendquota(request, transport); 108 break; 109 default: 110 svcerr_noproc(transport); 111 break; 112 } 113 return; 114 } 115 116 /* read quota for the specified id, and send it */ 117 void 118 sendquota(request, transport) 119 struct svc_req *request; 120 SVCXPRT *transport; 121 { 122 struct getquota_args getq_args; 123 struct getquota_rslt getq_rslt; 124 struct dqblk dqblk; 125 struct timeval timev; 126 127 getq_args.gqa_pathp = NULL; /* allocated by svc_getargs */ 128 if (svc_getargs(transport, xdr_getquota_args, 129 (caddr_t)&getq_args) == 0) { 130 svcerr_decode(transport); 131 return; 132 } 133 if (request->rq_cred.oa_flavor != AUTH_UNIX) { 134 /* bad auth */ 135 getq_rslt.status = Q_EPERM; 136 } else if (getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, 137 &dqblk) == 0) { 138 getq_rslt.status = Q_NOQUOTA; /* failed, return noquota */ 139 } else { 140 gettimeofday(&timev, NULL); 141 getq_rslt.status = Q_OK; 142 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE; 143 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE; 144 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit = 145 dqblk.dqb_bhardlimit; 146 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit = 147 dqblk.dqb_bsoftlimit; 148 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks = 149 dqblk.dqb_curblocks; 150 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit = 151 dqblk.dqb_ihardlimit; 152 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit = 153 dqblk.dqb_isoftlimit; 154 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles = 155 dqblk.dqb_curinodes; 156 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft = 157 dqblk.dqb_btime - timev.tv_sec; 158 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft = 159 dqblk.dqb_itime - timev.tv_sec; 160 } 161 if (svc_sendreply(transport, xdr_getquota_rslt, (char *)&getq_rslt) == 0) 162 printerr_reply(transport); 163 return; 164 } 165 166 void 167 exit_svc(signo) /* signal trapped */ 168 int signo; 169 { 170 syslog(LOG_ERR, "exiting on signal %d", signo); 171 pmap_unset(RQUOTAPROG, RQUOTAVERS); 172 exit(0); 173 } 174 175 void 176 printerr_reply(transport) /* when a reply to a request failed */ 177 SVCXPRT *transport; 178 { 179 char *name; 180 struct sockaddr_in *caller; 181 int save_errno; 182 183 save_errno = errno; 184 185 caller = svc_getcaller(transport); 186 name = (char *)inet_ntoa(caller->sin_addr); 187 errno = save_errno; 188 if (errno == 0) 189 syslog(LOG_ERR, "couldn't send reply to %s", name); 190 else 191 syslog(LOG_ERR, "couldn't send reply to %s: %m", name); 192 return; 193 } 194 195 /* initialise the fs_tab list from entries in /etc/fstab */ 196 void 197 initfs() 198 { 199 struct fs_stat *fs_current = NULL; 200 struct fs_stat *fs_next = NULL; 201 char *qfpathname; 202 struct fstab *fs; 203 struct stat st; 204 char *qfextension[] = INITQFNAMES; 205 206 setfsent(); 207 while (fs = getfsent()) { 208 if (strcmp(fs->fs_vfstype, "ufs")) 209 continue; 210 if (!hasquota(fs, &qfpathname)) 211 continue; 212 213 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat)); 214 fs_current->fs_next = fs_next; /* next element */ 215 216 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1)); 217 strcpy(fs_current->fs_file, fs->fs_file); 218 219 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1)); 220 strcpy(fs_current->qfpathname, qfpathname); 221 222 stat(qfpathname, &st); 223 fs_current->st_dev = st.st_dev; 224 225 fs_next = fs_current; 226 } 227 endfsent(); 228 fs_begin = fs_current; 229 } 230 231 /* 232 * gets the quotas for id, filesystem path. 233 * Return 0 if fail, 1 otherwise 234 */ 235 int 236 getfsquota(id, path, dqblk) 237 long id; 238 char *path; 239 struct dqblk *dqblk; 240 { 241 struct stat st_path; 242 struct fs_stat *fs; 243 int qcmd, fd, ret = 0; 244 char *qfextension[] = INITQFNAMES; 245 246 if (stat(path, &st_path) < 0) 247 return (0); 248 249 qcmd = QCMD(Q_GETQUOTA, USRQUOTA); 250 251 for (fs = fs_begin; fs != NULL; fs = fs->fs_next) { 252 /* where the devise is the same as path */ 253 if (fs->st_dev != st_path.st_dev) 254 continue; 255 256 /* find the specified filesystem. get and return quota */ 257 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0) 258 return (1); 259 260 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) { 261 syslog(LOG_ERR, "couldn't read %s:%m", fs->qfpathname); 262 return (0); 263 } 264 if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) { 265 close(fd); 266 return (1); 267 } 268 switch (read(fd, dqblk, sizeof(struct dqblk))) { 269 case 0: 270 /* 271 * Convert implicit 0 quota (EOF) 272 * into an explicit one (zero'ed dqblk) 273 */ 274 bzero((caddr_t) dqblk, sizeof(struct dqblk)); 275 ret = 1; 276 break; 277 case sizeof(struct dqblk): /* OK */ 278 ret = 1; 279 break; 280 default: /* ERROR */ 281 syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname); 282 close(fd); 283 return (0); 284 } 285 close(fd); 286 } 287 return (ret); 288 } 289 290 /* 291 * Check to see if a particular quota is to be enabled. 292 * Comes from quota.c, NetBSD 0.9 293 */ 294 int 295 hasquota(fs, qfnamep) 296 struct fstab *fs; 297 char **qfnamep; 298 { 299 static char initname, usrname[100]; 300 static char buf[BUFSIZ]; 301 char *opt, *cp; 302 char *qfextension[] = INITQFNAMES; 303 304 if (!initname) { 305 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME); 306 initname = 1; 307 } 308 strcpy(buf, fs->fs_mntops); 309 for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) { 310 if (cp = index(opt, '=')) 311 *cp++ = '\0'; 312 if (strcmp(opt, usrname) == 0) 313 break; 314 } 315 if (!opt) 316 return (0); 317 if (cp) { 318 *qfnamep = cp; 319 return (1); 320 } 321 sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]); 322 *qfnamep = buf; 323 return (1); 324 } 325
Indexes created Fri Sep 26 20:09:58 GMT 2025