X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/progs/cc-enc.c?ds=sidebyside

diff --git a/progs/cc-enc.c b/progs/cc-enc.c
new file mode 100644
index 0000000..61d9805
--- /dev/null
+++ b/progs/cc-enc.c
@@ -0,0 +1,528 @@
+/* -*-c-*-
+ *
+ * Catcrypt data encoding
+ *
+ * (c) 2004 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <errno.h>
+#include <stdio.h>
+
+#include <mLib/alloc.h>
+#include <mLib/base64.h>
+#include <mLib/dstr.h>
+#include <mLib/mdwopt.h>
+#include <mLib/report.h>
+#include <mLib/sub.h>
+
+#include "cc.h"
+
+typedef int encbdryp(const char *, void *);
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- Binary --- */
+
+static enc *bin_encinit(FILE *fp, const char *msg)
+  { enc *e = CREATE(enc); return (e); }
+static enc *bin_decinit(FILE *fp, encbdryp *func, void *p)
+  { enc *e = CREATE(enc); return (e); }
+
+static int bin_read(enc *e, void *p, size_t sz)
+{
+  size_t n;
+
+  if (!sz) return (0);
+  n = fread(p, 1, sz, e->fp);
+  if (!n || ferror(e->fp)) return (-1);
+  return (n);
+}
+
+static int bin_write(enc *e, const void *p, size_t sz)
+  { if (sz && fwrite(p, 1, sz, e->fp) < sz) return (-1); return (0); }
+
+static int bin_done(enc *e) { return (0); }
+
+static void bin_destroy(enc *e) { DESTROY(e); }
+
+/* --- PEM --- */
+
+typedef struct pem_encctx {
+  enc e;
+  char *msg;
+  unsigned f;
+  base64_ctx b;
+  dstr d;
+  size_t n;
+#define PEMF_NL 1u
+#define PEMF_EOF 2u
+} pem_encctx;
+
+static enc *pem_encinit(FILE *fp, const char *msg)
+{
+  pem_encctx *pe = CREATE(pem_encctx);
+  base64_init(&pe->b);
+  fprintf(fp, "-----BEGIN %s-----\n", msg);
+  pe->msg = xstrdup(msg);
+  dstr_create(&pe->d);
+  pe->n = 0;
+  pe->f = 0;
+  return (&pe->e);
+}
+
+int checkbdry(const char *b, void *p) { return (!p || strcmp(b, p) == 0); }
+
+static enc *pem_decinit(FILE *fp, encbdryp *func, void *p)
+{
+  char buf[128];
+  int i, d;
+  pem_encctx *pe;
+  int ch;
+
+  /* --- Go until I find a newline and `-----' --- */
+
+top:
+  d = 0;
+  for (;;) {
+    if ((ch = getc(fp)) == EOF) goto fail;
+    switch (ch) {
+      case '\n': d = 0; break;
+      case '-': if (d >= 0) { d++; if (d == 5) goto banner; }; break;
+      default: d = -1; break;
+    }
+  }
+
+  /* --- See what the banner looks like --- */
+
+banner:
+  i = d = 0;
+  for (;;) {
+    if ((ch = getc(fp)) == EOF) goto fail;
+    if (ch == '-') { d++; continue; }
+    if (ch == '\n') break;
+    if (i + d + 1 >= sizeof(buf)) goto top;
+    while (d) { buf[i++] = '-'; d--; }
+    buf[i++] = ch;
+  }
+  buf[i] = 0;
+
+  /* --- Check we have the right framing --- */
+
+  if (d != 5) goto top;
+  if (strncmp(buf, "BEGIN ", 6) != 0 || (func && !func(buf + 6, p)))
+    goto top;
+
+  /* --- Ready --- */
+
+  pe = CREATE(pem_encctx);
+  base64_init(&pe->b);
+  pe->msg = xstrdup(buf + 6);
+  dstr_create(&pe->d);
+  pe->n = 0;
+  pe->f = PEMF_NL;
+  return (&pe->e);
+
+  /* --- Failed --- */
+
+fail:
+  die(EXIT_FAILURE, "initial encapsulation boundary not found");
+  return (0);
+}
+
+#define PEM_CHUNKSZ 4096
+
+static int pem_read(enc *e, void *p, size_t sz)
+{
+  pem_encctx *pe = (pem_encctx *)e;
+  char buf[PEM_CHUNKSZ];
+  char *pp = p;
+  int ch;
+  size_t n;
+  int rc = 0;
+
+  for (;;) {
+    n = pe->d.len - pe->n;
+    if (n > sz) n = sz;
+    memcpy(pp, pe->d.buf + pe->n, n);
+    pe->n += n;
+    pp += n;
+    rc += n;
+    sz -= n;
+    if (!sz) break;
+    if (pe->f & PEMF_EOF) return (rc ? rc : -1);
+    dstr_reset(&pe->d);
+    n = 0;
+    for (;;) {
+      if ((ch = getc(pe->e.fp)) == EOF) return (-1);
+      if ((pe->f & PEMF_NL) && ch == '-') {
+	ungetc(ch, pe->e.fp);
+	pe->f |= PEMF_EOF;
+	break;
+      }
+      if (ch == '\n') { pe->f |= PEMF_NL; continue; }
+      pe->f &= ~PEMF_NL;
+      buf[n++] = ch;
+      if (n >= PEM_CHUNKSZ) break;
+    }
+    if (n)
+      base64_decode(&pe->b, buf, n, &pe->d);
+    if (pe->f & PEMF_EOF)
+      base64_decode(&pe->b, 0, 0, &pe->d);
+    pe->n = 0;
+  }
+  return (rc);
+}
+
+static int pem_write(enc *e, const void *p, size_t sz)
+{
+  pem_encctx *pe = (pem_encctx *)e;
+  const char *pp = p;
+  size_t n;
+
+  while (sz) {
+    n = PEM_CHUNKSZ;
+    if (n > sz) n = sz;
+    dstr_reset(&pe->d);
+    base64_encode(&pe->b, pp, n, &pe->d);
+    if (fwrite(pe->d.buf, 1, pe->d.len, pe->e.fp) < pe->d.len)
+      return (-1);
+    pp += n;
+    sz -= n;
+  }
+  return (0);
+}
+
+static int pem_encdone(enc *e)
+{
+  pem_encctx *pe = (pem_encctx *)e;
+  dstr_reset(&pe->d);
+  base64_encode(&pe->b, 0, 0, &pe->d);
+  if (fwrite(pe->d.buf, 1, pe->d.len, pe->e.fp) < pe->d.len)
+    return (-1);
+  if (pe->b.lnlen) fputc('\n', pe->e.fp);
+  fprintf(pe->e.fp, "-----END %s-----\n", pe->msg);
+  return (0);
+}
+
+static int pem_decdone(enc *e)
+{
+  pem_encctx *pe = (pem_encctx *)e;
+  char buf[128];
+  int i, d;
+  int ch;
+
+  for (d = 0; d < 5; d++)
+    if ((ch = getc(pe->e.fp)) != '-') goto fail;
+  i = d = 0;
+  for (;;) {
+    if ((ch = getc(pe->e.fp)) == EOF) goto fail;
+    if (ch == '-') { d++; continue; }
+    if (ch == '\n') break;
+    if (i + d + 1 >= sizeof(buf)) goto fail;
+    while (d) { buf[i++] = '-'; d--; }
+    buf[i++] = ch;
+  }
+  if (d != 5) goto fail;
+  buf[i] = 0;
+  if (strncmp(buf, "END ", 4) != 0 || strcmp(buf + 4, pe->msg) != 0)
+    goto fail;
+  return (0);
+
+fail:
+  die(EXIT_FAILURE, "final encapsulation boundary not found");
+  return (-1);
+}
+
+static void pem_destroy(enc *e)
+{
+  pem_encctx *pe = (pem_encctx *)e;
+  dstr_destroy(&pe->d);
+  xfree(pe->msg);
+  DESTROY(pe);
+}
+
+/* --- Encoder table --- */
+
+const encops enctab[] = {
+  { "binary", "rb", "wb", 1, 1,
+    bin_encinit, bin_decinit,
+    bin_read, bin_write,
+    bin_done, bin_done,
+    bin_destroy },
+  { "pem", "r", "w", 3, 4,
+    pem_encinit, pem_decinit,
+    pem_read, pem_write,
+    pem_encdone, pem_decdone,
+    pem_destroy },
+  { 0 }
+};
+
+/* --- @getenc@ --- *
+ *
+ * Arguments:	@const char *enc@ = name of wanted encoding
+ *
+ * Returns:	Pointer to encoder operations.
+ *
+ * Use:		Finds a named encoder or decoder.
+ */
+
+const encops *getenc(const char *enc)
+{
+  const encops *eo;
+
+  for (eo = enctab; eo->name; eo++) {
+    if (strcmp(eo->name, enc) == 0)
+      goto e_found;
+  }
+  die(EXIT_FAILURE, "couldn't find encoding `%s'", enc);
+e_found:
+  return (eo);
+}
+
+/* --- @initenc@ --- *
+ *
+ * Arguments:	@const encops *eo@ = operations (from @getenc@)
+ *		@FILE *fp@ = file handle to attach
+ *		@const char *msg@ = banner message
+ *
+ * Returns:	The encoder object.
+ *
+ * Use:		Initializes an encoder.
+ */
+
+enc *initenc(const encops *eo, FILE *fp, const char *msg)
+{
+  enc *e = eo->initenc(fp, msg);
+  e->ops = eo;
+  e->fp = fp;
+  return (e);
+}
+
+/* --- @initdec@ --- *
+ *
+ * Arguments:	@const encops *eo@ = operations (from @getenc@)
+ *		@FILE *fp@ = file handle to attach
+ *		@int (*func)(const char *, void *)@ = banner check function
+ *		@void *p@ = argument for @func@
+ *
+ * Returns:	The encoder object.
+ *
+ * Use:		Initializes an encoder.
+ */
+
+enc *initdec(const encops *eo, FILE *fp,
+	     int (*func)(const char *, void *), void *p)
+{
+  enc *e = eo->initdec(fp, func, p);
+  e->ops = eo;
+  e->fp = fp;
+  return (e);
+}
+
+/* --- @freeenc@ --- *
+ *
+ * Arguments:	@enc *e@ = encoder object
+ *
+ * Returns:	---
+ *
+ * Use:		Frees an encoder object.
+ */
+
+void freeenc(enc *e) { e->ops->destroy(e); }
+
+/*----- Encoding and decoding commands ------------------------------------*/
+
+int cmd_encode(int argc, char *argv[])
+{
+  const char *fn, *of = 0;
+  FILE *ofp = 0;
+  FILE *fp = 0;
+  const char *ef = "binary";
+  const char *bd = "MESSAGE";
+  fprogress ff;
+  int i;
+  size_t n;
+  char buf[4096];
+  unsigned f = 0;
+  const encops *eo;
+  enc *e;
+
+#define f_bogus 1u
+#define f_progress 2u
+
+  for (;;) {
+    static const struct option opt[] = {
+      { "format",	OPTF_ARGREQ,	0,	'f' },
+      { "boundary",	OPTF_ARGREQ,	0,	'b' },
+      { "output",	OPTF_ARGREQ,	0,	'o' },
+      { "progress",	0,		0,	'p' },
+      { 0,		0,		0,	0 }
+    };
+    i = mdwopt(argc, argv, "f:b:o:p", opt, 0, 0, 0);
+    if (i < 0) break;
+    switch (i) {
+      case 'f': ef = optarg; break;
+      case 'b': bd = optarg; break;
+      case 'o': of = optarg; break;
+      case 'p': f |= f_progress; break;
+      default: f |= f_bogus; break;
+    }
+  }
+  if (argc - optind > 1 || (f & f_bogus))
+    die(EXIT_FAILURE, "Usage: encode [-OPTIONS] [FILE]");
+
+  if ((eo = getenc(ef)) == 0)
+    die(EXIT_FAILURE, "encoding `%s' not found", ef);
+
+  fn = optind < argc ? argv[optind++] : "-";
+  if (strcmp(fn, "-") == 0)
+    fp = stdin;
+  else if ((fp = fopen(fn, "rb")) == 0) {
+    die(EXIT_FAILURE, "couldn't open file `%s': %s",
+	fn, strerror(errno));
+  }
+
+  if (!of || strcmp(of, "-") == 0)
+    ofp = stdout;
+  else if ((ofp = fopen(of, eo->wmode)) == 0) {
+    die(EXIT_FAILURE, "couldn't open file `%s' for output: %s",
+	ofp, strerror(errno));
+  }
+
+  e = initenc(eo, ofp, bd);
+
+  if (f & f_progress) {
+    if (fprogress_init(&ff, fn, fp)) {
+      die(EXIT_FAILURE, "failed to initialize progress display: %s",
+	  strerror(errno));
+    }
+  }
+
+  do {
+    n = fread(buf, 1, sizeof(buf), fp);
+    if (f & f_progress) fprogress_update(&ff, n);
+    if (e->ops->write(e, buf, n)) {
+      if (f & f_progress) fprogress_done(&ff);
+      die(EXIT_FAILURE, "error writing output: %s", strerror(errno));
+    }
+  } while (n == sizeof(buf));
+  if (f & f_progress) fprogress_done(&ff);
+  e->ops->encdone(e);
+  freeenc(e);
+  return (0);
+
+#undef f_bogus
+#undef f_progress
+}
+
+int cmd_decode(int argc, char *argv[])
+{
+  const char *fn, *of = 0;
+  FILE *ofp = 0;
+  FILE *fp = 0;
+  const char *ef = "binary";
+  const char *bd = 0;
+  fprogress ff;
+  int i;
+  char buf[4096];
+  unsigned f = 0;
+  const encops *eo;
+  enc *e;
+
+#define f_bogus 1u
+#define f_progress 2u
+
+  for (;;) {
+    static const struct option opt[] = {
+      { "format",	OPTF_ARGREQ,	0,	'f' },
+      { "boundary",	OPTF_ARGREQ,	0,	'b' },
+      { "output",	OPTF_ARGREQ,	0,	'o' },
+      { "progress",	0,		0,	'p' },
+      { 0,		0,		0,	0 }
+    };
+    i = mdwopt(argc, argv, "f:b:o:p", opt, 0, 0, 0);
+    if (i < 0) break;
+    switch (i) {
+      case 'f': ef = optarg; break;
+      case 'b': bd = optarg; break;
+      case 'o': of = optarg; break;
+      case 'p': f |= f_progress; break;
+      default: f |= f_bogus; break;
+    }
+  }
+  if (argc - optind > 1 || (f & f_bogus))
+    die(EXIT_FAILURE, "Usage: decode [-OPTIONS] [FILE]");
+
+  if ((eo = getenc(ef)) == 0)
+    die(EXIT_FAILURE, "encoding `%s' not found", ef);
+
+  fn = optind < argc ? argv[optind++] : "-";
+  if (strcmp(fn, "-") == 0)
+    fp = stdin;
+  else if ((fp = fopen(fn, eo->rmode)) == 0) {
+    die(EXIT_FAILURE, "couldn't open file `%s': %s",
+	fn, strerror(errno));
+  }
+
+  if (!of || strcmp(of, "-") == 0)
+    ofp = stdout;
+  else if ((ofp = fopen(of, "wb")) == 0) {
+    die(EXIT_FAILURE, "couldn't open file `%s' for output: %s",
+	ofp, strerror(errno));
+  }
+
+  e = initdec(eo, fp, checkbdry, (/*unconst*/ void *)bd);
+
+  if (f & f_progress) {
+    if (fprogress_init(&ff, fn, fp)) {
+      die(EXIT_FAILURE, "failed to initialize progress display: %s",
+	  strerror(errno));
+    }
+  }
+
+  do {
+    if ((i = e->ops->read(e, buf, sizeof(buf))) < 0) {
+      if (f & f_progress) fprogress_done(&ff);
+      die(EXIT_FAILURE, "error reading input: %s", strerror(errno));
+    }
+    if (f & f_progress)
+      fprogress_update(&ff, i*e->ops->ncook/e->ops->nraw);
+    if (fwrite(buf, 1, i, ofp) < i) {
+      if (f & f_progress) fprogress_done(&ff);
+      die(EXIT_FAILURE, "error writing output: %s", strerror(errno));
+    }
+  } while (i == sizeof(buf));
+  e->ops->decdone(e);
+  if (f & f_progress) fprogress_done(&ff);
+  freeenc(e);
+  return (0);
+
+#undef f_bogus
+#undef f_progress
+}
+
+/*----- That's all, folks -------------------------------------------------*/