Annotation of src/usr.bin/mail/fio.c, Revision 1.1
1.1 ! deraadt 1: /*
! 2: * Copyright (c) 1980, 1993
! 3: * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
! 14: * must display the following acknowledgement:
! 15: * This product includes software developed by the University of
! 16: * California, Berkeley and its contributors.
! 17: * 4. Neither the name of the University nor the names of its contributors
! 18: * may be used to endorse or promote products derived from this software
! 19: * without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 31: * SUCH DAMAGE.
! 32: */
! 33:
! 34: #ifndef lint
! 35: static char sccsid[] = "from: @(#)fio.c 8.1 (Berkeley) 6/6/93";
! 36: static char rcsid[] = "$Id: fio.c,v 1.4 1994/06/29 05:09:22 deraadt Exp $";
! 37: #endif /* not lint */
! 38:
! 39: #include "rcv.h"
! 40: #include <sys/file.h>
! 41: #include <sys/wait.h>
! 42:
! 43: #include <unistd.h>
! 44: #include <paths.h>
! 45: #include <errno.h>
! 46: #include "extern.h"
! 47:
! 48: /*
! 49: * Mail -- a mail program
! 50: *
! 51: * File I/O.
! 52: */
! 53:
! 54: /*
! 55: * Set up the input pointers while copying the mail file into /tmp.
! 56: */
! 57: void
! 58: setptr(ibuf)
! 59: register FILE *ibuf;
! 60: {
! 61: extern char *tmpdir;
! 62: register int c, count;
! 63: register char *cp, *cp2;
! 64: struct message this;
! 65: FILE *mestmp;
! 66: off_t offset;
! 67: int maybe, inhead;
! 68: char linebuf[LINESIZE];
! 69:
! 70: /* Get temporary file. */
! 71: (void)sprintf(linebuf, "%s/mail.XXXXXX", tmpdir);
! 72: if ((c = mkstemp(linebuf)) == -1 ||
! 73: (mestmp = Fdopen(c, "r+")) == NULL) {
! 74: (void)fprintf(stderr, "mail: can't open %s\n", linebuf);
! 75: exit(1);
! 76: }
! 77: (void)unlink(linebuf);
! 78:
! 79: msgCount = 0;
! 80: maybe = 1;
! 81: inhead = 0;
! 82: offset = 0;
! 83: this.m_flag = MUSED|MNEW;
! 84: this.m_size = 0;
! 85: this.m_lines = 0;
! 86: this.m_block = 0;
! 87: this.m_offset = 0;
! 88: for (;;) {
! 89: if (fgets(linebuf, LINESIZE, ibuf) == NULL) {
! 90: if (append(&this, mestmp)) {
! 91: perror("temporary file");
! 92: exit(1);
! 93: }
! 94: makemessage(mestmp);
! 95: return;
! 96: }
! 97: count = strlen(linebuf);
! 98: (void) fwrite(linebuf, sizeof *linebuf, count, otf);
! 99: if (ferror(otf)) {
! 100: perror("/tmp");
! 101: exit(1);
! 102: }
! 103: linebuf[count - 1] = 0;
! 104: if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
! 105: msgCount++;
! 106: if (append(&this, mestmp)) {
! 107: perror("temporary file");
! 108: exit(1);
! 109: }
! 110: this.m_flag = MUSED|MNEW;
! 111: this.m_size = 0;
! 112: this.m_lines = 0;
! 113: this.m_block = blockof(offset);
! 114: this.m_offset = offsetof(offset);
! 115: inhead = 1;
! 116: } else if (linebuf[0] == 0) {
! 117: inhead = 0;
! 118: } else if (inhead) {
! 119: for (cp = linebuf, cp2 = "status";; cp++) {
! 120: if ((c = *cp2++) == 0) {
! 121: while (isspace(*cp++))
! 122: ;
! 123: if (cp[-1] != ':')
! 124: break;
! 125: while (c = *cp++)
! 126: if (c == 'R')
! 127: this.m_flag |= MREAD;
! 128: else if (c == 'O')
! 129: this.m_flag &= ~MNEW;
! 130: inhead = 0;
! 131: break;
! 132: }
! 133: if (*cp != c && *cp != toupper(c))
! 134: break;
! 135: }
! 136: }
! 137: offset += count;
! 138: this.m_size += count;
! 139: this.m_lines++;
! 140: maybe = linebuf[0] == 0;
! 141: }
! 142: }
! 143:
! 144: /*
! 145: * Drop the passed line onto the passed output buffer.
! 146: * If a write error occurs, return -1, else the count of
! 147: * characters written, including the newline.
! 148: */
! 149: int
! 150: putline(obuf, linebuf)
! 151: FILE *obuf;
! 152: char *linebuf;
! 153: {
! 154: register int c;
! 155:
! 156: c = strlen(linebuf);
! 157: (void) fwrite(linebuf, sizeof *linebuf, c, obuf);
! 158: (void) putc('\n', obuf);
! 159: if (ferror(obuf))
! 160: return (-1);
! 161: return (c + 1);
! 162: }
! 163:
! 164: /*
! 165: * Read up a line from the specified input into the line
! 166: * buffer. Return the number of characters read. Do not
! 167: * include the newline at the end.
! 168: */
! 169: int
! 170: readline(ibuf, linebuf, linesize)
! 171: FILE *ibuf;
! 172: char *linebuf;
! 173: int linesize;
! 174: {
! 175: register int n;
! 176:
! 177: clearerr(ibuf);
! 178: if (fgets(linebuf, linesize, ibuf) == NULL)
! 179: return -1;
! 180: n = strlen(linebuf);
! 181: if (n > 0 && linebuf[n - 1] == '\n')
! 182: linebuf[--n] = '\0';
! 183: return n;
! 184: }
! 185:
! 186: /*
! 187: * Return a file buffer all ready to read up the
! 188: * passed message pointer.
! 189: */
! 190: FILE *
! 191: setinput(mp)
! 192: register struct message *mp;
! 193: {
! 194:
! 195: fflush(otf);
! 196: if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), 0) < 0) {
! 197: perror("fseek");
! 198: panic("temporary file seek");
! 199: }
! 200: return (itf);
! 201: }
! 202:
! 203: /*
! 204: * Take the data out of the passed ghost file and toss it into
! 205: * a dynamically allocated message structure.
! 206: */
! 207: void
! 208: makemessage(f)
! 209: FILE *f;
! 210: {
! 211: register size = (msgCount + 1) * sizeof (struct message);
! 212:
! 213: if (message != 0)
! 214: free((char *) message);
! 215: if ((message = (struct message *) malloc((unsigned) size)) == 0)
! 216: panic("Insufficient memory for %d messages", msgCount);
! 217: dot = message;
! 218: size -= sizeof (struct message);
! 219: fflush(f);
! 220: (void) lseek(fileno(f), (off_t)sizeof *message, 0);
! 221: if (read(fileno(f), (char *) message, size) != size)
! 222: panic("Message temporary file corrupted");
! 223: message[msgCount].m_size = 0;
! 224: message[msgCount].m_lines = 0;
! 225: Fclose(f);
! 226: }
! 227:
! 228: /*
! 229: * Append the passed message descriptor onto the temp file.
! 230: * If the write fails, return 1, else 0
! 231: */
! 232: int
! 233: append(mp, f)
! 234: struct message *mp;
! 235: FILE *f;
! 236: {
! 237: return fwrite((char *) mp, sizeof *mp, 1, f) != 1;
! 238: }
! 239:
! 240: /*
! 241: * Delete a file, but only if the file is a plain file.
! 242: */
! 243: int
! 244: rm(name)
! 245: char *name;
! 246: {
! 247: struct stat sb;
! 248:
! 249: if (stat(name, &sb) < 0)
! 250: return(-1);
! 251: if (!S_ISREG(sb.st_mode)) {
! 252: errno = EISDIR;
! 253: return(-1);
! 254: }
! 255: return(unlink(name));
! 256: }
! 257:
! 258: static int sigdepth; /* depth of holdsigs() */
! 259: static int omask;
! 260: /*
! 261: * Hold signals SIGHUP, SIGINT, and SIGQUIT.
! 262: */
! 263: void
! 264: holdsigs()
! 265: {
! 266:
! 267: if (sigdepth++ == 0)
! 268: omask = sigblock(sigmask(SIGHUP)|sigmask(SIGINT)|sigmask(SIGQUIT));
! 269: }
! 270:
! 271: /*
! 272: * Release signals SIGHUP, SIGINT, and SIGQUIT.
! 273: */
! 274: void
! 275: relsesigs()
! 276: {
! 277:
! 278: if (--sigdepth == 0)
! 279: sigsetmask(omask);
! 280: }
! 281:
! 282: /*
! 283: * Determine the size of the file possessed by
! 284: * the passed buffer.
! 285: */
! 286: off_t
! 287: fsize(iob)
! 288: FILE *iob;
! 289: {
! 290: struct stat sbuf;
! 291:
! 292: if (fstat(fileno(iob), &sbuf) < 0)
! 293: return 0;
! 294: return sbuf.st_size;
! 295: }
! 296:
! 297: /*
! 298: * Evaluate the string given as a new mailbox name.
! 299: * Supported meta characters:
! 300: * % for my system mail box
! 301: * %user for user's system mail box
! 302: * # for previous file
! 303: * & invoker's mbox file
! 304: * +file file in folder directory
! 305: * any shell meta character
! 306: * Return the file name as a dynamic string.
! 307: */
! 308: char *
! 309: expand(name)
! 310: register char *name;
! 311: {
! 312: char xname[PATHSIZE];
! 313: char cmdbuf[PATHSIZE]; /* also used for file names */
! 314: register int pid, l;
! 315: register char *cp, *shell;
! 316: int pivec[2];
! 317: struct stat sbuf;
! 318: extern union wait wait_status;
! 319:
! 320: /*
! 321: * The order of evaluation is "%" and "#" expand into constants.
! 322: * "&" can expand into "+". "+" can expand into shell meta characters.
! 323: * Shell meta characters expand into constants.
! 324: * This way, we make no recursive expansion.
! 325: */
! 326: switch (*name) {
! 327: case '%':
! 328: findmail(name[1] ? name + 1 : myname, xname);
! 329: return savestr(xname);
! 330: case '#':
! 331: if (name[1] != 0)
! 332: break;
! 333: if (prevfile[0] == 0) {
! 334: printf("No previous file\n");
! 335: return NOSTR;
! 336: }
! 337: return savestr(prevfile);
! 338: case '&':
! 339: if (name[1] == 0 && (name = value("MBOX")) == NOSTR)
! 340: name = "~/mbox";
! 341: /* fall through */
! 342: }
! 343: if (name[0] == '+' && getfold(cmdbuf) >= 0) {
! 344: sprintf(xname, "%s/%s", cmdbuf, name + 1);
! 345: name = savestr(xname);
! 346: }
! 347: /* catch the most common shell meta character */
! 348: if (name[0] == '~' && (name[1] == '/' || name[1] == '\0')) {
! 349: sprintf(xname, "%s%s", homedir, name + 1);
! 350: name = savestr(xname);
! 351: }
! 352: if (!anyof(name, "~{[*?$`'\"\\"))
! 353: return name;
! 354: if (pipe(pivec) < 0) {
! 355: perror("pipe");
! 356: return name;
! 357: }
! 358: sprintf(cmdbuf, "echo %s", name);
! 359: if ((shell = value("SHELL")) == NOSTR)
! 360: shell = _PATH_CSHELL;
! 361: pid = start_command(shell, 0, -1, pivec[1], "-c", cmdbuf, NOSTR);
! 362: if (pid < 0) {
! 363: close(pivec[0]);
! 364: close(pivec[1]);
! 365: return NOSTR;
! 366: }
! 367: close(pivec[1]);
! 368: l = read(pivec[0], xname, BUFSIZ);
! 369: close(pivec[0]);
! 370: if (wait_child(pid) < 0 && wait_status.w_termsig != SIGPIPE) {
! 371: fprintf(stderr, "\"%s\": Expansion failed.\n", name);
! 372: return NOSTR;
! 373: }
! 374: if (l < 0) {
! 375: perror("read");
! 376: return NOSTR;
! 377: }
! 378: if (l == 0) {
! 379: fprintf(stderr, "\"%s\": No match.\n", name);
! 380: return NOSTR;
! 381: }
! 382: if (l == BUFSIZ) {
! 383: fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
! 384: return NOSTR;
! 385: }
! 386: xname[l] = 0;
! 387: for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
! 388: ;
! 389: cp[1] = '\0';
! 390: if (index(xname, ' ') && stat(xname, &sbuf) < 0) {
! 391: fprintf(stderr, "\"%s\": Ambiguous.\n", name);
! 392: return NOSTR;
! 393: }
! 394: return savestr(xname);
! 395: }
! 396:
! 397: /*
! 398: * Determine the current folder directory name.
! 399: */
! 400: int
! 401: getfold(name)
! 402: char *name;
! 403: {
! 404: char *folder;
! 405:
! 406: if ((folder = value("folder")) == NOSTR)
! 407: return (-1);
! 408: if (*folder == '/')
! 409: strcpy(name, folder);
! 410: else
! 411: sprintf(name, "%s/%s", homedir, folder);
! 412: return (0);
! 413: }
! 414:
! 415: /*
! 416: * Return the name of the dead.letter file.
! 417: */
! 418: char *
! 419: getdeadletter()
! 420: {
! 421: register char *cp;
! 422:
! 423: if ((cp = value("DEAD")) == NOSTR || (cp = expand(cp)) == NOSTR)
! 424: cp = expand("~/dead.letter");
! 425: else if (*cp != '/') {
! 426: char buf[PATHSIZE];
! 427:
! 428: (void) sprintf(buf, "~/%s", cp);
! 429: cp = expand(buf);
! 430: }
! 431: return cp;
! 432: }
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