commit caf30c150740e01b41af2fe0d5c32da701c089eb
from: Alex Arx <aa@manpager.org>
date: Sun Nov 17 07:55:28 2024 UTC

add the -a flag

commit - 46c6b68fcc1011714b10ec0e4c497767510323db
commit + caf30c150740e01b41af2fe0d5c32da701c089eb
blob - 720e5d29369c312702fcf3b4ae7dafb6513e335a
blob + 359be0d60a07a35d828fccddf3334f549fa16655
--- gpass.c
+++ gpass.c
@@ -14,10 +14,14 @@
 #	define PREFIX "/usr/local"
 #endif
 
+#define NNUM ('9'-'0' + 1)
+#define NALPHA ('z'-'a' + 1)
+
 FILE *dicfp;
 uint32_t nwords = 0;
 int offs[MAXWORDS];
 int plen = 70;
+int aflag = 0;
 
 void
 errx(int eval, const char *fmt, ...)
@@ -53,18 +57,59 @@ err(int eval, const char *fmt, ...)
 int
 usage(void)
 {
-	fprintf(stderr, "usage: gpass [-d dict] [-e bits] [-n count]\n");
+	fprintf(stderr, "usage: gpass [-a] [-d dict] [-e bits] [-n count]\n");
 	exit(EXIT_FAILURE);
 }
 
 void
-gen(void)
+setplen(void) {
+	int temp;
+
+	temp = log2(nwords);
+	plen = plen / temp + !!(plen % temp);
+	plen += !plen;
+}
+
+void
+genalpha(void)
 {
 	int c;
 	int left;
 	uint32_t n;
 
 	for (left = plen; left; left--) {
+		n = arc4random_uniform(NNUM + NALPHA*2);
+		if (n < NNUM)
+			putchar('0' + n);
+		else if (n < NNUM + NALPHA)
+			putchar('A' + (n - NNUM));
+		else
+			putchar('a' + (n - NNUM - NALPHA));
+	}
+	putchar('\n');
+}
+
+void
+gpass_alpha(int npass)
+{
+#ifdef __OpenBSD__
+	if (pledge("stdio rpath", NULL) == -1) /* revoke unveil */
+		err(1, "pledge");
+#endif
+	nwords = NNUM + NALPHA*2;
+	setplen();
+	for (int i = 0; i < npass; i++)
+		genalpha();
+}
+
+void
+genwords(void)
+{
+	int c;
+	int left;
+	uint32_t n;
+
+	for (left = plen; left; left--) {
 		n = arc4random_uniform(nwords) + 1;
 		if (fseek(dicfp, offs[n], SEEK_SET) == -1)
 			err(1, "fseek");
@@ -76,13 +121,41 @@ gen(void)
 	putchar('\n');
 }
 
+void
+gpass_words(int npass, char *f)
+{
+	char c, isword;
+
+#ifdef __OpenBSD__
+	if (unveil(f, "r") == -1)
+		err(1, "unveil %s", f);
+	if (pledge("stdio rpath", NULL) == -1) /* revoke unveil */
+		err(1, "pledge");
+#endif
+	if (!(dicfp = fopen(f, "r")))
+		err(1, "could not open %s", f);
+	offs[0] = ftell(dicfp);
+	while ((c = getc(dicfp)) != EOF && nwords < MAXWORDS)
+		if (isspace(c)) {
+			nwords += isword ? 1 : 0;
+			isword = 0;
+			offs[nwords] = ftell(dicfp);
+		} else
+			isword = 1;
+	if (nwords < 2)
+		errx(1, "%s has less that 2 words", f);
+	setplen();
+	for (int i = 0; i < npass; i++)
+		genwords();
+	fclose(dicfp);
+}
+
 int
 main(int argc, char *argv[])
 {
-	int c, isword, npass, temp;
+	int c, npass;
 	char *dicname;
 
-	isword = 0;
 	npass = 1;
 	dicname = NULL;
 
@@ -90,8 +163,11 @@ main(int argc, char *argv[])
 	if (pledge("stdio unveil rpath", NULL) == -1) /* first call */
 		err(1, "pledge");
 #endif
-	while ((c = getopt(argc, argv, "d:e:n:")) != -1) {
+	while ((c = getopt(argc, argv, "ad:e:n:")) != -1) {
 		switch (c) {
+		case 'a':
+			aflag = 1;
+			break;
 		case 'd':
 			dicname = optarg;
 			break;
@@ -108,35 +184,13 @@ main(int argc, char *argv[])
 		}
 	}
 
-	if (!dicname && !(dicname = getenv("GPASS_DIC")))
-		dicname = PREFIX "/share/gpass/eff.long";
-#ifdef __OpenBSD__
-	if (unveil(dicname, "r") == -1)
-		err(1, "unveil %s", dicname);
-	if (pledge("stdio rpath", NULL) == -1) /* revoke unveil */
-		err(1, "pledge");
-#endif
+	if (aflag)
+		gpass_alpha(npass);
+	else {
+		if (!dicname && !(dicname = getenv("GPASS_DIC")))
+			dicname = PREFIX "/share/gpass/eff.long";
+		gpass_words(npass, dicname);
+	}
 
-	if (!(dicfp = fopen(dicname, "r")))
-		err(1, "could not open %s", dicname);
-	offs[0] = ftell(dicfp);
-	while ((c = getc(dicfp)) != EOF && nwords < MAXWORDS)
-		if (isspace(c)) {
-			nwords += isword ? 1 : 0;
-			isword = 0;
-			offs[nwords] = ftell(dicfp);
-		} else
-			isword = 1;
-	if (nwords < 2)
-		errx(1, "%s has less that 2 words", dicname);
-
-	temp = log2(nwords);
-	plen = plen / temp + !!(plen % temp);
-	plen += !plen;
-
-	for (int i = 0; i < npass; i++)
-		gen();
-	fclose(dicfp);
-
 	return 0;
 }
blob - 311505122b174272d1f3f39adcc93e0f0a046c0b
blob + 367b9ca4da3f50c95145395fd730ddbda313541a
--- gpass.m4
+++ gpass.m4
@@ -6,6 +6,7 @@
 .Nd generate passphrases
 .Sh SYNOPSIS
 .Nm
+.Op Fl a
 .Op Fl d Ar dict
 .Op Fl e Ar bits
 .Op Fl n Ar num
@@ -16,6 +17,9 @@ outputs a secure passphrase by randomly choosing an ap
 from a dictionary file, containing whitespace-separated words.
 The options are as follows:
 .Bl -tag -width Ds
+.It Fl a
+Instead of generating a passphrases from the wordlist, generate strings of
+random alphanumeric characters.
 .It Fl d Ar dict
 Use the dictionary
 .Ar dict .