1 /* rmjob.c 4.3 83/05/18 */ 2 /* 3 * rmjob - remove the specified jobs from the queue. 4 */ 5 6 #include "lp.h" 7 8 /* 9 * Stuff for handling lprm specifications 10 */ 11 extern char *user[]; /* users to process */ 12 extern int users; /* # of users in user array */ 13 extern int requ[]; /* job number of spool entries */ 14 extern int requests; /* # of spool requests */ 15 16 char *person; /* name of person doing lprm */ 17 char root[] = "root"; 18 int all = 0; /* eliminate all files (root only) */ 19 int cur_daemon; /* daemon's pid */ 20 char current[40]; /* active control file name */ 21 22 int iscf(); 23 24 rmjob() 25 { 26 register int i, nitems; 27 int assasinated = 0; 28 struct direct **files; 29 30 if ((i = pgetent(line, printer)) < 0) 31 fatal("cannot open printer description file"); 32 else if (i == 0) 33 fatal("unknown printer"); 34 if ((SD = pgetstr("sd", &bp)) == NULL) 35 SD = DEFSPOOL; 36 if ((LO = pgetstr("lo", &bp)) == NULL) 37 LO = DEFLOCK; 38 if ((LP = pgetstr("lp", &bp)) == NULL) 39 LP = DEFDEVLP; 40 if ((RP = pgetstr("rp", &bp)) == NULL) 41 RP = DEFLP; 42 RM = pgetstr("rm", &bp); 43 44 /* 45 * If the format was `lprm -' and the user isn't the super-user, 46 * then fake things to look like he said `lprm user'. 47 */ 48 if (users < 0) { 49 if (getuid() == 0) 50 all = 1; /* all files in local queue */ 51 else { 52 user[0] = person; 53 users = 1; 54 } 55 } 56 if (!strcmp(person, "-all")) { 57 if (from == host) 58 fatal("The login name \"-all\" is reserved"); 59 all = 1; /* all those from 'from' */ 60 person = root; 61 } 62 63 if (chdir(SD) < 0) 64 fatal("cannot chdir to spool directory"); 65 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 66 fatal("cannot access spool directory"); 67 68 if (nitems) { 69 /* 70 * Check for an active printer daemon (in which case we 71 * kill it if it is reading our file) then remove stuff 72 * (after which we have to restart the daemon). 73 */ 74 if (lockchk(LO) && chk(current)) { 75 assasinated = kill(cur_daemon, SIGINT) == 0; 76 if (!assasinated) 77 fatal("cannot kill printer daemon"); 78 } 79 /* 80 * process the files 81 */ 82 for (i = 0; i < nitems; i++) 83 process(files[i]->d_name); 84 } 85 chkremote(); 86 /* 87 * Restart the printer daemon if it was killed 88 */ 89 if (assasinated && !startdaemon()) 90 fatal("cannot restart printer daemon\n"); 91 exit(0); 92 } 93 94 /* 95 * Process a lock file: collect the pid of the active 96 * daemon and the file name of the active spool entry. 97 * Return boolean indicating existence of a lock file. 98 */ 99 lockchk(s) 100 char *s; 101 { 102 register FILE *fp; 103 register int i, n; 104 105 if ((fp = fopen(s, "r")) == NULL) 106 if (errno == EACCES) 107 fatal("can't access lock file"); 108 else 109 return(0); 110 if (!getline(fp) || flock(fileno(fp), FSHLOCK|FNBLOCK) == 0) { 111 (void) fclose(fp); 112 return(0); /* no daemon present */ 113 } 114 cur_daemon = atoi(line); 115 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 116 if (i > 5) { 117 n = 1; 118 break; 119 } 120 sleep(i); 121 } 122 current[n-1] = '\0'; 123 (void) fclose(fp); 124 return(1); 125 } 126 127 /* 128 * Process a control file. 129 */ 130 process(file) 131 char *file; 132 { 133 FILE *cfp; 134 135 if (!chk(file)) 136 return; 137 if ((cfp = fopen(file, "r")) == NULL) 138 fatal("cannot open %s", file); 139 while (getline()) { 140 switch (line[0]) { 141 case 'U': /* unlink associated files */ 142 if (from != host) 143 printf("%s: ", host); 144 printf(unlink(line+1) ? "cannot dequeue %s\n" : 145 "%s dequeued\n", line+1); 146 } 147 } 148 (void) fclose(cfp); 149 if (from != host) 150 printf("%s: ", host); 151 printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file); 152 } 153 154 /* 155 * Do the dirty work in checking 156 */ 157 chk(file) 158 char *file; 159 { 160 register int *r, n; 161 register char **u, *cp; 162 FILE *cfp; 163 164 if (all && (from == host || !strcmp(from, file+6))) 165 return(1); 166 167 /* 168 * get the owner's name from the control file. 169 */ 170 if ((cfp = fopen(file, "r")) == NULL) 171 return(0); 172 while (getline(cfp)) { 173 if (line[0] == 'P') 174 break; 175 } 176 (void) fclose(cfp); 177 if (line[0] != 'P') 178 return(0); 179 180 if (users == 0 && requests == 0) 181 return(!strcmp(file, current) && isowner(line+1, file)); 182 /* 183 * Check the request list 184 */ 185 for (n = 0, cp = file+3; isdigit(*cp); ) 186 n = n * 10 + (*cp++ - '0'); 187 for (r = requ; r < &requ[requests]; r++) 188 if (*r == n && isowner(line+1, file)) 189 return(1); 190 /* 191 * Check to see if it's in the user list 192 */ 193 for (u = user; u < &user[users]; u++) 194 if (!strcmp(*u, line+1) && isowner(line+1, file)) 195 return(1); 196 return(0); 197 } 198 199 /* 200 * If root is removing a file on the local machine, allow it. 201 * If root is removing a file from a remote machine, only allow 202 * files sent from the remote machine to be removed. 203 * Normal users can only remove the file from where it was sent. 204 */ 205 isowner(owner, file) 206 char *owner, *file; 207 { 208 if (!strcmp(person, root) && (from == host || !strcmp(from, file+6))) 209 return(1); 210 if (!strcmp(person, owner) && !strcmp(from, file+6)) 211 return(1); 212 if (from != host) 213 printf("%s: ", host); 214 printf("%s: Permission denied\n", file); 215 return(0); 216 } 217 218 /* 219 * Check to see if we are sending files to a remote machine. If we are, 220 * then try removing files on the remote machine. 221 */ 222 chkremote() 223 { 224 register char *cp; 225 register int i, rem; 226 char buf[BUFSIZ]; 227 228 if (*LP || RM == NULL) 229 return; /* not sending to a remote machine */ 230 231 /* 232 * Flush stdout so the user can see what has been deleted 233 * while we wait (possibly) for the connection. 234 */ 235 fflush(stdout); 236 237 sprintf(buf, "\5%s %s", RP, all ? "-all" : person); 238 cp = buf; 239 for (i = 0; i < users; i++) { 240 cp += strlen(cp); 241 *cp++ = ' '; 242 strcpy(cp, user[i]); 243 } 244 for (i = 0; i < requests; i++) { 245 cp += strlen(cp); 246 (void) sprintf(cp, " %d", requ[i]); 247 } 248 strcat(cp, "\n"); 249 rem = getport(RM); 250 if (rem < 0) { 251 if (from != host) 252 printf("%s: ", host); 253 printf("connection to %s is down\n", RM); 254 } else { 255 i = strlen(buf); 256 if (write(rem, buf, i) != i) 257 fatal("Lost connection"); 258 while ((i = read(rem, buf, sizeof(buf))) > 0) 259 (void) fwrite(buf, 1, i, stdout); 260 (void) close(rem); 261 } 262 } 263 264 /* 265 * Return 1 if the filename begins with 'cf' 266 */ 267 iscf(d) 268 struct direct *d; 269 { 270 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 271 } 272