Initial commit of the uudecode tool and man page
Currently it operates only on regular files and does not support Base64.
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1
Makefile
1
Makefile
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@ -85,6 +85,7 @@ SRC = \
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tr.c \
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true.c \
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tty.c \
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uudecode.c \
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uuencode.c \
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uname.c \
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uniq.c \
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19
uudecode.1
Normal file
19
uudecode.1
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@ -0,0 +1,19 @@
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.TH UUDECODE 1 sbase\-VERSION
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.SH NAME
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uudecode \- decode a uuencoded file
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.SH SYNOPSIS
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.B uudecode
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.RI [file]
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.SH DESCRIPTION
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.B uudecode
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reads file (or by default, the standard input) and writes a decoded
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version to the file specified in the uuencoded header. In case that
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the file already exists, it is truncated. Otherwise a new file is
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created. After the operation the permissions of the created/accessed
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are changed to reflect the mode in the header.
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.SH NOTES
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This version of uudecode does not currently support the base64
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encoding algorithm.
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For safety currently uudecode operates only on regular files and
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stdout. Trying to uudecode to a link, directory, or special file
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yields an error.
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245
uudecode.c
Normal file
245
uudecode.c
Normal file
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@ -0,0 +1,245 @@
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/* See LICENSE file for copyright and license details. */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <limits.h>
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#include "util.h"
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#include "text.h"
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static int uudecode(FILE *, FILE*);
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static int checkheader(FILE *, const char *, mode_t *, char **, char **);
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static int checkmode(const char *, mode_t *);
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static FILE *checkfile(const char *);
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static void
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usage(void)
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{
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eprintf("usage: %s [file]\n", argv0);
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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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FILE *fp, *nfp;
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char *fname, *headerr;
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mode_t mode = 0;
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int chmodtest;
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ARGBEGIN {
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case 'm':
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eprintf("-m not implemented\n");
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default:
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usage();
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} ARGEND;
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if (argc > 1)
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usage();
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if (argc == 0) {
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if (checkheader(stdin, "begin ", &mode, &fname, &headerr) < 0)
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eprintf("%s\n",headerr);
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nfp = checkfile(fname);
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if (nfp == NULL)
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eprintf("fopen %s:", fname);
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if (uudecode(stdin, nfp) < 0)
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goto fail;
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} else {
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if (!(fp = fopen(argv[0], "r")))
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eprintf("fopen %s:", argv[0]);
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if (checkheader(fp, "begin ", &mode, &fname, &headerr) < 0) {
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fclose(fp);
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eprintf("%s\n",headerr);
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}
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nfp = checkfile(fname);
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if (nfp == NULL) {
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fclose(fp);
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eprintf("fopen %s:", fname);
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}
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if (uudecode(fp, nfp) < 0) {
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fclose(fp);
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goto fail;
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}
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}
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chmodtest=fchmod(fileno(nfp),mode);
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fclose(fp);
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fclose(nfp);
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if (chmodtest == -1)
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eprintf("chmod %s:%s",fname,strerror(errno));
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return EXIT_SUCCESS;
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fail:
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fclose(nfp);
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return EXIT_FAILURE;
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}
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static FILE *
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checkfile(const char *fname)
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{
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struct stat st;
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int ret;
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if (strcmp(fname,"/dev/stdout") == 0)
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return stdout;
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ret = lstat(fname, &st);
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if (ret < 0 && errno == ENOENT)
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goto tropen; /* new file, try to open it */
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if (ret < 0) {
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weprintf("stat: %s:", fname);
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return NULL;
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}
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if (!S_ISREG(st.st_mode)) {
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weprintf("for safety uudecode operates only on regular files and /dev/stdout\n");
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return NULL;
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}
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tropen:
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return fopen(fname,"w");
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}
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static int
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checkheader(FILE *fp, const char *header, mode_t *mode, char **fname, char **headerr)
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{
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char bufs[PATH_MAX + 11]; /* len header + mode + maxname */
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char *p, *q, *bufp = NULL;
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size_t n;
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fgets(bufs, sizeof(bufs), fp);
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if (bufp == NULL || bufp == '\0') { /* empty or null str */
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*headerr = "empty or null header string";
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return -1;
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}
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if ((p = strchr(bufs, '\n')) == NULL) { /* line too long or last line on file */
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*headerr = "header string too long or non-newline terminated file";
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return -1;
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}
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p = bufs;
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if (strncmp(bufs, header, strlen(header)) != 0) {
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*headerr = "malformed header prefix";
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return -1;
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}
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p += strlen(header);
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if ((q = strchr(p, ' ')) == NULL) { /* malformed mode */
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*headerr = "malformed mode string in header";
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return -1;
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}
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*q++ = '\0'; /* now mode should be null terminated,q points to fname */
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if (checkmode(p,mode) < 0) { /* error from checkmode */
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*headerr = "invalid mode in header";
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return -1;
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}
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n = strlen(q);
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while (n > 0 && (q[n-1] == '\n' || q[n-1] == '\r'))
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q[--n] = '\0';
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if (n > 0)
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*fname = q;
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return 1;
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}
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static int
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checkmode(const char *str,mode_t *validmode)
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{
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char *end;
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int octal;
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if (str == NULL || str == '\0')
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return -1; /* null str */
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octal = strtol(str, &end, 8);
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if (*end == '\0') { /* successful conversion from a valid str */
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if (octal >= 0 && octal <= 07777) {
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if(octal & 04000) *validmode |= S_ISUID;
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if(octal & 02000) *validmode |= S_ISGID;
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if(octal & 01000) *validmode |= S_ISVTX;
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if(octal & 00400) *validmode |= S_IRUSR;
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if(octal & 00200) *validmode |= S_IWUSR;
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if(octal & 00100) *validmode |= S_IXUSR;
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if(octal & 00040) *validmode |= S_IRGRP;
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if(octal & 00020) *validmode |= S_IWGRP;
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if(octal & 00010) *validmode |= S_IXGRP;
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if(octal & 00004) *validmode |= S_IROTH;
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if(octal & 00002) *validmode |= S_IWOTH;
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if(octal & 00001) *validmode |= S_IXOTH;
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*validmode &= 07777;
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return 1;
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}
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}
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return -1; /* malformed mode */
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}
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static int
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uudecode(FILE *fp, FILE *outfp)
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{
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char *bufb=NULL, *p,*nl;
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size_t n=0;
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int ch , i;
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#define DEC(c) (((c) - ' ') & 077) /* single character decode */
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#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) )
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#define OUT_OF_RANGE(c) do { \
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weprintf("character %c out of range: [%d-%d]",(c), 1+' ',077+' '+1); \
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return -1; \
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} while (0)
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while (afgets(&bufb,&n,fp)) {
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p = bufb;
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if ((nl=strchr(bufb, '\n')) != NULL) { /* trim newlines */
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*nl = '\0';
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} else {
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weprintf("no newline found, aborting\n");
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return -1;
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}
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if ((i = DEC(*p)) <= 0) /* check for last line */
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break;
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for (++p; i > 0; p += 4, i -= 3) {
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if (i >= 3) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
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OUT_OF_RANGE(*p);
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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putc(ch, outfp);
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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putc(ch, outfp);
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ch = DEC(p[2]) << 6 | DEC(p[3]);
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putc(ch, outfp);
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} else {
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if (i >= 1) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
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OUT_OF_RANGE(*p);
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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putc(ch, outfp);
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}
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if (i >= 2) {
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if (!(IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2))))
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OUT_OF_RANGE(*p);
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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putc(ch, outfp);
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}
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}
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}
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if (ferror(fp)) {
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weprintf("read error");
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return -1;
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}
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}
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/* check for end or fail*/
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afgets(&bufb,&n,fp);
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if (strnlen(bufb,3) < 3 || strncmp(bufb, "end", 3) != 0 || bufb[3] != '\n') {
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weprintf("valid uudecode footer \"end\" not found\n");
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return -1;
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}
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return 1;
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}
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