mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-25 12:02:01 +01:00
493 lines
11 KiB
C
493 lines
11 KiB
C
/*
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* Accept one (or more) ASCII encoded chunks that together make a compressed
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* CTM delta. Decode them and reconstruct the deltas. Any completed
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* deltas may be passed to ctm for unpacking.
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*
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* Author: Stephen McKay
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*
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* NOTICE: This is free software. I hope you get some use from this program.
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* In return you should think about all the nice people who give away software.
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* Maybe you should write some free software too.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "error.h"
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#include "options.h"
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#define CTM_STATUS ".ctm_status"
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char *piece_dir = NULL; /* Where to store pieces of deltas. */
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char *delta_dir = NULL; /* Where to store completed deltas. */
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char *base_dir = NULL; /* The tree to apply deltas to. */
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int delete_after = 0; /* Delete deltas after ctm applies them. */
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void apply_complete(void);
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int read_piece(char *input_file);
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int combine_if_complete(char *delta, int pce, int npieces);
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int decode_line(char *line, char *out_buf);
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/*
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* If given a '-p' flag, read encoded delta pieces from stdin or file
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* arguments, decode them and assemble any completed deltas. If given
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* a '-b' flag, pass any completed deltas to 'ctm' for application to
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* the source tree. The '-d' flag is mandatory, but either of '-p' or
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* '-b' can be omitted. If given the '-l' flag, notes and errors will
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* be timestamped and written to the given file.
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*
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* Exit status is 0 for success or 1 for indigestible input. That is,
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* 0 means the encode input pieces were decoded and stored, and 1 means
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* some input was discarded. If a delta fails to apply, this won't be
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* reflected in the exit status. In this case, the delta is left in
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* 'deltadir'.
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*/
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int
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main(int argc, char **argv)
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{
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char *log_file = NULL;
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int status = 0;
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err_prog_name(argv[0]);
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OPTIONS("[-D] [-p piecedir] [-d deltadir] [-b basedir] [-l log] [file ...]")
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FLAG('D', delete_after)
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STRING('p', piece_dir)
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STRING('d', delta_dir)
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STRING('b', base_dir)
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STRING('l', log_file)
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ENDOPTS
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if (delta_dir == NULL)
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usage();
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if (piece_dir == NULL && (base_dir == NULL || argc > 1))
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usage();
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if (log_file != NULL)
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err_set_log(log_file);
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if (argc <= 1)
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{
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if (piece_dir != NULL)
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status = read_piece(NULL);
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}
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else
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{
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while (*++argv != NULL)
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status |= read_piece(*argv);
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}
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if (base_dir != NULL)
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apply_complete();
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return status;
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}
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/*
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* Construct the file name of a piece of a delta.
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*/
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#define mk_piece_name(fn,d,p,n) \
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sprintf((fn), "%s/%s+%d-%d", piece_dir, (d), (p), (n))
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/*
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* Construct the file name of an assembled delta.
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*/
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#define mk_delta_name(fn,d) \
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sprintf((fn), "%s/%s", delta_dir, (d))
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/*
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* If the next required delta is now present, let ctm lunch on it and any
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* contiguous deltas.
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*/
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void
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apply_complete()
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{
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int i, dn;
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FILE *fp, *ctm;
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struct stat sb;
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char class[20];
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char delta[30];
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char fname[1000];
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char buf[2000];
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char junk[2];
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char here[1000];
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sprintf(fname, "%s/%s", base_dir, CTM_STATUS);
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if ((fp = fopen(fname, "r")) == NULL)
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return;
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i = fscanf(fp, "%s %d %c", class, &dn, junk);
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fclose(fp);
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if (i != 2)
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return;
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/*
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* We might need to convert the delta filename to an absolute pathname.
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*/
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here[0] = '\0';
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if (delta_dir[0] != '/')
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{
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getcwd(here, sizeof(here)-1);
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i = strlen(here) - 1;
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if (i >= 0 && here[i] != '/')
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{
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here[++i] = '/';
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here[++i] = '\0';
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}
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}
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/*
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* Keep applying deltas until we run out or something bad happens.
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*/
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for (;;)
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{
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sprintf(delta, "%s.%04d.gz", class, ++dn);
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mk_delta_name(fname, delta);
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if (stat(fname, &sb) < 0)
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return;
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sprintf(buf, "(cd %s && /usr/sbin/ctm %s%s) 2>&1",
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base_dir, here, fname);
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if ((ctm = popen(buf, "r")) == NULL)
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{
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err("ctm failed to apply %s", delta);
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return;
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}
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while (fgets(buf, sizeof(buf), ctm) != NULL)
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{
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i = strlen(buf) - 1;
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if (i >= 0 && buf[i] == '\n')
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buf[i] = '\0';
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err("ctm: %s", buf);
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}
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if (pclose(ctm) != 0)
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{
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err("ctm failed to apply %s", delta);
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return;
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}
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if (delete_after)
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unlink(fname);
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err("%s applied%s", delta, delete_after ? " and deleted" : "");
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}
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}
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/*
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* This cheap plastic checksum effectively rotates our checksum-so-far
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* left one, then adds the character. We only want 16 bits of it, and
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* don't care what happens to the rest. It ain't much, but it's small.
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*/
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#define add_ck(sum,x) \
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((sum) += ((x)&0xff) + (sum) + (((sum)&0x8000) ? 1 : 0))
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/*
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* Decode the data between BEGIN and END, and stash it in the staging area.
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* Multiple pieces can be present in a single file, bracketed by BEGIN/END.
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* If we have all pieces of a delta, combine them. Returns 0 on success,
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* and 1 for any sort of failure.
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*/
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int
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read_piece(char *input_file)
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{
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int status = 0;
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FILE *ifp, *ofp = 0;
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int decoding = 0;
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int line_no = 0;
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int i, n;
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int pce, npieces;
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unsigned claimed_cksum;
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unsigned short cksum = 0;
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char out_buf[200];
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char line[200];
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char delta[30];
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char pname[1000];
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char junk[2];
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ifp = stdin;
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if (input_file != NULL && (ifp = fopen(input_file, "r")) == NULL)
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{
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err("cannot open '%s' for reading", input_file);
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return 1;
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}
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while (fgets(line, sizeof(line), ifp) != NULL)
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{
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line_no++;
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/*
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* Look for the beginning of an encoded piece.
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*/
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if (!decoding)
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{
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char *s;
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if (sscanf(line, "CTM_MAIL BEGIN %s %d %d %c",
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delta, &pce, &npieces, junk) != 3)
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continue;
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while ((s = strchr(delta, '/')) != NULL)
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*s = '_';
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mk_piece_name(pname, delta, pce, npieces);
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if ((ofp = fopen(pname, "w")) == NULL)
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{
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err("cannot open '%s' for writing", pname);
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status++;
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continue;
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}
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cksum = 0xffff;
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decoding++;
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continue;
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}
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/*
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* We are decoding. Stop if we see the end flag.
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*/
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if (sscanf(line, "CTM_MAIL END %d %c", &claimed_cksum, junk) == 1)
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{
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int e;
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decoding = 0;
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fflush(ofp);
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e = ferror(ofp);
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fclose(ofp);
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if (e)
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err("error writing %s", pname);
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if (cksum != claimed_cksum)
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err("checksum: read %d, calculated %d", claimed_cksum, cksum);
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if (e || cksum != claimed_cksum)
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{
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err("%s %d/%d discarded", delta, pce, npieces);
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unlink(pname);
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status++;
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continue;
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}
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err("%s %d/%d stored", delta, pce, npieces);
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if (!combine_if_complete(delta, pce, npieces))
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status++;
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continue;
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}
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/*
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* Must be a line of encoded data. Decode it, sum it, and save it.
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*/
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n = decode_line(line, out_buf);
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if (n < 0)
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{
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err("line %d: illegal character: '%c'", line_no, line[-n]);
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err("%s %d/%d discarded", delta, pce, npieces);
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fclose(ofp);
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unlink(pname);
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status++;
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decoding = 0;
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continue;
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}
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for (i = 0; i < n; i++)
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add_ck(cksum, out_buf[i]);
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fwrite(out_buf, sizeof(char), n, ofp);
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}
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if (decoding)
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{
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err("truncated file");
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err("%s %d/%d discarded", delta, pce, npieces);
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fclose(ofp);
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unlink(pname);
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status++;
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}
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if (ferror(ifp))
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{
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err("error reading %s", input_file == NULL ? "stdin" : input_file);
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status++;
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}
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if (input_file != NULL)
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fclose(ifp);
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return (status != 0);
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}
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/*
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* Put the pieces together to form a delta, if they are all present.
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* Returns 1 on success (even if we didn't do anything), and 0 on failure.
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*/
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int
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combine_if_complete(char *delta, int pce, int npieces)
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{
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int i;
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FILE *dfp, *pfp;
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int c;
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struct stat sb;
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char pname[1000];
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char dname[1000];
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/*
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* All here?
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*/
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for (i = 1; i <= npieces; i++)
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{
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if (i == pce)
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continue;
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mk_piece_name(pname, delta, i, npieces);
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if (stat(pname, &sb) < 0)
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return 1;
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}
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mk_delta_name(dname, delta);
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/*
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* We can probably just rename() it in to place if it is a small delta.
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*/
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if (npieces == 1)
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{
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mk_piece_name(pname, delta, 1, 1);
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if (rename(pname, dname) == 0)
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{
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err("%s complete", delta);
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return 1;
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}
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}
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if ((dfp = fopen(dname, "w")) == NULL)
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{
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err("cannot open '%s' for writing", dname);
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return 0;
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}
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/*
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* Ok, the hard way. Reconstruct the delta by reading each piece in order.
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*/
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for (i = 1; i <= npieces; i++)
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{
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mk_piece_name(pname, delta, i, npieces);
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if ((pfp = fopen(pname, "r")) == NULL)
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{
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err("cannot open '%s' for reading", pname);
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fclose(dfp);
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unlink(dname);
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return 0;
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}
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while ((c = getc(pfp)) != EOF)
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putc(c, dfp);
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fclose(pfp);
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}
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fflush(dfp);
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if (ferror(dfp))
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{
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err("error writing '%s'", dname);
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fclose(dfp);
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unlink(dname);
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return 0;
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}
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fclose(dfp);
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/*
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* Throw the pieces away.
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*/
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for (i = 1; i <= npieces; i++)
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{
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mk_piece_name(pname, delta, i, npieces);
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unlink(pname);
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}
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err("%s complete", delta);
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return 1;
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}
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/*
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* MIME BASE64 decode table.
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*/
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static unsigned char from_b64[0x80] =
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{
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
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0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
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0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
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0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
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0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
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0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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/*
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* Decode a line of ASCII into binary. Returns the number of bytes in
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* the output buffer, or < 0 on indigestable input. Error output is
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* the negative of the index of the inedible character.
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*/
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int
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decode_line(char *line, char *out_buf)
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{
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unsigned char *ip = (unsigned char *)line;
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unsigned char *op = (unsigned char *)out_buf;
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unsigned long bits;
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unsigned x;
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for (;;)
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{
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if (*ip >= 0x80 || (x = from_b64[*ip]) >= 0x40)
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break;
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bits = x << 18;
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ip++;
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if (*ip < 0x80 && (x = from_b64[*ip]) < 0x40)
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{
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bits |= x << 12;
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*op++ = bits >> 16;
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ip++;
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if (*ip < 0x80 && (x = from_b64[*ip]) < 0x40)
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{
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bits |= x << 6;
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*op++ = bits >> 8;
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ip++;
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if (*ip < 0x80 && (x = from_b64[*ip]) < 0x40)
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{
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bits |= x;
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*op++ = bits;
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ip++;
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}
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}
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}
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}
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if (*ip == '\0' || *ip == '\n')
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return op - (unsigned char *)out_buf;
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else
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return -(ip - (unsigned char *)line);
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}
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