1 /* 2 * by Manuel Bouyer (bouyer@ensta.fr) 3 * 4 * There is no copyright, you can use it as you want. 5 * 6 * $FreeBSD: src/libexec/rpc.rquotad/rquotad.c,v 1.3.2.1 2001/07/02 23:46:27 mikeh Exp $ 7 * $DragonFly: src/libexec/rpc.rquotad/rquotad.c,v 1.6 2008/11/19 18:41:30 swildner Exp $ 8 */ 9 10 #include <sys/param.h> 11 #include <sys/types.h> 12 #include <sys/mount.h> 13 #include <sys/file.h> 14 #include <sys/stat.h> 15 #include <sys/socket.h> 16 #include <signal.h> 17 18 #include <ctype.h> 19 #include <errno.h> 20 #include <fstab.h> 21 #include <grp.h> 22 #include <pwd.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <unistd.h> 27 28 #include <syslog.h> 29 30 #include <vfs/ufs/quota.h> 31 #include <rpc/rpc.h> 32 #include <rpcsvc/rquota.h> 33 #include <arpa/inet.h> 34 #include <netdb.h> 35 36 static void cleanup(int); 37 static void rquota_service(struct svc_req *request, SVCXPRT *transp); 38 static void sendquota(struct svc_req *request, SVCXPRT *transp); 39 static void initfs(void); 40 static int getfsquota(long id, char *path, struct ufs_dqblk *dqblk); 41 static int hasquota(struct fstab *fs, char **qfnamep); 42 43 /* 44 * structure containing informations about ufs filesystems 45 * initialised by initfs() 46 */ 47 struct fs_stat { 48 struct fs_stat *fs_next; /* next element */ 49 char *fs_file; /* mount point of the filesystem */ 50 char *qfpathname; /* pathname of the quota file */ 51 dev_t st_dev; /* device of the filesystem */ 52 } fs_stat; 53 struct fs_stat *fs_begin = NULL; 54 55 int from_inetd = 1; 56 57 void 58 cleanup(int signo __unused) 59 { 60 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL); 61 exit(0); 62 } 63 64 int 65 main(void) 66 { 67 SVCXPRT *transp; 68 int ok; 69 struct sockaddr_storage from; 70 int fromlen; 71 72 fromlen = sizeof(from); 73 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) { 74 from_inetd = 0; 75 } 76 77 if (!from_inetd) { 78 daemon(0, 0); 79 80 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL); 81 82 (void) signal(SIGINT, cleanup); 83 (void) signal(SIGTERM, cleanup); 84 (void) signal(SIGHUP, cleanup); 85 } 86 87 openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON); 88 89 /* create and register the service */ 90 if (from_inetd) { 91 transp = svc_tli_create(0, NULL, NULL, 0, 0); 92 if (transp == NULL) { 93 syslog(LOG_ERR, "couldn't create udp service."); 94 exit(1); 95 } 96 ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS, 97 rquota_service, NULL); 98 } else 99 ok = svc_create(rquota_service, 100 RQUOTAPROG, RQUOTAVERS, "udp"); 101 if (!ok) { 102 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"udp":"(inetd)"); 103 exit(1); 104 } 105 106 initfs(); /* init the fs_stat list */ 107 svc_run(); 108 syslog(LOG_ERR, "svc_run returned"); 109 exit(1); 110 } 111 112 void 113 rquota_service(struct svc_req *request, SVCXPRT *transp) 114 { 115 switch (request->rq_proc) { 116 case NULLPROC: 117 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL); 118 break; 119 120 case RQUOTAPROC_GETQUOTA: 121 case RQUOTAPROC_GETACTIVEQUOTA: 122 sendquota(request, transp); 123 break; 124 125 default: 126 svcerr_noproc(transp); 127 break; 128 } 129 if (from_inetd) 130 exit(0); 131 } 132 133 /* read quota for the specified id, and send it */ 134 void 135 sendquota(struct svc_req *request, SVCXPRT *transp) 136 { 137 struct getquota_args getq_args; 138 struct getquota_rslt getq_rslt; 139 struct ufs_dqblk dqblk; 140 struct timeval timev; 141 142 bzero((char *)&getq_args, sizeof(getq_args)); 143 if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) { 144 svcerr_decode(transp); 145 return; 146 } 147 if (request->rq_cred.oa_flavor != AUTH_UNIX) { 148 /* bad auth */ 149 getq_rslt.status = Q_EPERM; 150 } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) { 151 /* failed, return noquota */ 152 getq_rslt.status = Q_NOQUOTA; 153 } else { 154 gettimeofday(&timev, NULL); 155 getq_rslt.status = Q_OK; 156 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE; 157 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE; 158 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit = 159 dqblk.dqb_bhardlimit; 160 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit = 161 dqblk.dqb_bsoftlimit; 162 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks = 163 dqblk.dqb_curblocks; 164 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit = 165 dqblk.dqb_ihardlimit; 166 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit = 167 dqblk.dqb_isoftlimit; 168 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles = 169 dqblk.dqb_curinodes; 170 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft = 171 dqblk.dqb_btime - timev.tv_sec; 172 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft = 173 dqblk.dqb_itime - timev.tv_sec; 174 } 175 if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, (char *)&getq_rslt)) { 176 svcerr_systemerr(transp); 177 } 178 if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) { 179 syslog(LOG_ERR, "unable to free arguments"); 180 exit(1); 181 } 182 } 183 184 /* initialise the fs_tab list from entries in /etc/fstab */ 185 void 186 initfs(void) 187 { 188 struct fs_stat *fs_current = NULL; 189 struct fs_stat *fs_next = NULL; 190 char *qfpathname; 191 struct fstab *fs; 192 struct stat st; 193 194 setfsent(); 195 while ((fs = getfsent())) { 196 if (strcmp(fs->fs_vfstype, "ufs")) 197 continue; 198 if (!hasquota(fs, &qfpathname)) 199 continue; 200 201 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat)); 202 fs_current->fs_next = fs_next; /* next element */ 203 204 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1)); 205 strcpy(fs_current->fs_file, fs->fs_file); 206 207 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1)); 208 strcpy(fs_current->qfpathname, qfpathname); 209 210 stat(fs_current->fs_file, &st); 211 fs_current->st_dev = st.st_dev; 212 213 fs_next = fs_current; 214 } 215 endfsent(); 216 fs_begin = fs_current; 217 } 218 219 /* 220 * gets the quotas for id, filesystem path. 221 * Return 0 if fail, 1 otherwise 222 */ 223 int 224 getfsquota(long id, char *path, struct ufs_dqblk *dqblk) 225 { 226 struct stat st_path; 227 struct fs_stat *fs; 228 int qcmd, fd, ret = 0; 229 230 if (stat(path, &st_path) < 0) 231 return (0); 232 233 qcmd = QCMD(Q_GETQUOTA, USRQUOTA); 234 235 for (fs = fs_begin; fs != NULL; fs = fs->fs_next) { 236 /* where the devise is the same as path */ 237 if (fs->st_dev != st_path.st_dev) 238 continue; 239 240 /* find the specified filesystem. get and return quota */ 241 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0) 242 return (1); 243 244 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) { 245 syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname); 246 return (0); 247 } 248 if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) { 249 close(fd); 250 return (1); 251 } 252 switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) { 253 case 0: 254 /* 255 * Convert implicit 0 quota (EOF) 256 * into an explicit one (zero'ed dqblk) 257 */ 258 bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk)); 259 ret = 1; 260 break; 261 case sizeof(struct ufs_dqblk): /* OK */ 262 ret = 1; 263 break; 264 default: /* ERROR */ 265 syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname); 266 close(fd); 267 return (0); 268 } 269 close(fd); 270 } 271 return (ret); 272 } 273 274 /* 275 * Check to see if a particular quota is to be enabled. 276 * Comes from quota.c, NetBSD 0.9 277 */ 278 int 279 hasquota(struct fstab *fs, char **qfnamep) 280 { 281 static char initname, usrname[100]; 282 static char buf[BUFSIZ]; 283 char *opt, *cp; 284 const char *qfextension[] = INITQFNAMES; 285 286 if (!initname) { 287 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME); 288 initname = 1; 289 } 290 strcpy(buf, fs->fs_mntops); 291 for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) { 292 if ((cp = index(opt, '='))) 293 *cp++ = '\0'; 294 if (strcmp(opt, usrname) == 0) 295 break; 296 } 297 if (!opt) 298 return (0); 299 if (cp) { 300 *qfnamep = cp; 301 return (1); 302 } 303 sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]); 304 *qfnamep = buf; 305 return (1); 306 } 307