reformime: do not require \r\n

function                                             old     new   delta
parse                                                958    1063    +105
packed_usage                                       28691   28712     +21

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 280 insertions, 0 deletions

diff --git a/mailutils/reformime.c b/mailutils/reformime.c
new file mode 100644
index 0000000..aa5e3b1
--- /dev/null
+++ b/mailutils/reformime.c
@@ -0,0 +1,280 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * makemime: create MIME-encoded message
+ * reformime: parse MIME-encoded message
+ *
+ * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//kbuild:lib-$(CONFIG_REFORMIME) += reformime.o mail.o
+
+#include "libbb.h"
+#include "mail.h"
+
+#if 0
+# define dbg_error_msg(...) bb_error_msg(__VA_ARGS__)
+#else
+# define dbg_error_msg(...) ((void)0)
+#endif
+
+static const char *find_token(const char *const string_array[], const char *key, const char *defvalue)
+{
+	const char *r = NULL;
+	int i;
+	for (i = 0; string_array[i] != NULL; i++) {
+		if (strcasecmp(string_array[i], key) == 0) {
+			r = (char *)string_array[i+1];
+			break;
+		}
+	}
+	return (r) ? r : defvalue;
+}
+
+static const char *xfind_token(const char *const string_array[], const char *key)
+{
+	const char *r = find_token(string_array, key, NULL);
+	if (r)
+		return r;
+	bb_error_msg_and_die("not found: '%s'", key);
+}
+
+enum {
+	OPT_x = 1 << 0,
+	OPT_X = 1 << 1,
+#if ENABLE_FEATURE_REFORMIME_COMPAT
+	OPT_d = 1 << 2,
+	OPT_e = 1 << 3,
+	OPT_i = 1 << 4,
+	OPT_s = 1 << 5,
+	OPT_r = 1 << 6,
+	OPT_c = 1 << 7,
+	OPT_m = 1 << 8,
+	OPT_h = 1 << 9,
+	OPT_o = 1 << 10,
+	OPT_O = 1 << 11,
+#endif
+};
+
+static int parse(const char *boundary, char **argv)
+{
+	int boundary_len = strlen(boundary);
+	char uniq[sizeof("%%llu.%u") + sizeof(int)*3];
+
+	dbg_error_msg("BOUNDARY[%s]", boundary);
+
+	// prepare unique string pattern
+	sprintf(uniq, "%%llu.%u", (unsigned)getpid());
+	dbg_error_msg("UNIQ[%s]", uniq);
+
+	while (1) {
+		char *header;
+		const char *tokens[32]; /* 32 is enough */
+		const char *type;
+
+		/* Read the header (everything up to two \n) */
+		{
+			unsigned header_idx = 0;
+			int last_ch = 0;
+			header = NULL;
+			while (1) {
+				int ch = fgetc(stdin);
+				if (ch == '\r') /* Support both line endings */
+					continue;
+				if (ch == EOF)
+					break;
+				if (ch == '\n' && last_ch == ch)
+					break;
+				if (!(header_idx & 0xff))
+					header = xrealloc(header, header_idx + 0x101);
+				header[header_idx++] = last_ch = ch;
+			}
+			if (!header) {
+				dbg_error_msg("EOF");
+				break;
+			}
+			header[header_idx] = '\0';
+			dbg_error_msg("H:'%s'", p);
+		}
+
+		/* Split to tokens */
+		{
+			char *s, *p;
+			unsigned ntokens;
+			const char *delims = ";=\" \t\n";
+
+			/* Skip to last Content-Type: */
+			s = p = header;
+			while ((p = strchr(p, '\n')) != NULL) {
+				p++;
+				if (strncasecmp(p, "Content-Type:", sizeof("Content-Type:")-1) == 0)
+					s = p;
+			}
+			dbg_error_msg("L:'%s'", p);
+			ntokens = 0;
+			s = strtok(s, delims);
+			while (s) {
+				tokens[ntokens] = s;
+				if (ntokens < ARRAY_SIZE(tokens) - 1)
+					ntokens++;
+				dbg_error_msg("L[%d]='%s'", ntokens, s);
+				s = strtok(NULL, delims);
+			}
+			tokens[ntokens] = NULL;
+			dbg_error_msg("EMPTYLINE, ntokens:%d", ntokens);
+			if (ntokens == 0)
+				break;
+		}
+
+		/* Is it multipart? */
+		type = find_token(tokens, "Content-Type:", "text/plain");
+		dbg_error_msg("TYPE:'%s'", type);
+		if (0 == strncasecmp(type, "multipart/", 10)) {
+			/* Yes, recurse */
+			if (strcasecmp(type + 10, "mixed") != 0)
+				bb_error_msg_and_die("no support of content type '%s'", type);
+			parse(xfind_token(tokens, "boundary"), argv);
+
+		} else {
+			/* No, process one non-multipart section */
+			char *end;
+			pid_t pid = pid;
+			FILE *fp;
+
+			const char *charset = find_token(tokens, "charset", CONFIG_FEATURE_MIME_CHARSET);
+			const char *encoding = find_token(tokens, "Content-Transfer-Encoding:", "7bit");
+
+			/* Compose target filename */
+			char *filename = (char *)find_token(tokens, "filename", NULL);
+			if (!filename)
+				filename = xasprintf(uniq, monotonic_us());
+			else
+				filename = bb_get_last_path_component_strip(xstrdup(filename));
+
+			if (opts & OPT_X) {
+				int fd[2];
+
+				/* start external helper */
+				xpipe(fd);
+				pid = vfork();
+				if (0 == pid) {
+					/* child reads from fd[0] */
+					close(fd[1]);
+					xmove_fd(fd[0], STDIN_FILENO);
+					xsetenv("CONTENT_TYPE", type);
+					xsetenv("CHARSET", charset);
+					xsetenv("ENCODING", encoding);
+					xsetenv("FILENAME", filename);
+					BB_EXECVP_or_die(argv);
+				}
+				/* parent will write to fd[1] */
+				close(fd[0]);
+				fp = xfdopen_for_write(fd[1]);
+				signal(SIGPIPE, SIG_IGN);
+			} else {
+				/* write to file */
+				char *fname = xasprintf("%s%s", *argv, filename);
+				fp = xfopen_for_write(fname);
+				free(fname);
+			}
+			free(filename);
+
+			/* write to fp */
+			end = NULL;
+			if (0 == strcasecmp(encoding, "base64")) {
+				read_base64(stdin, fp, '-');
+			} else
+			if (0 != strcasecmp(encoding, "7bit")
+			 && 0 != strcasecmp(encoding, "8bit")
+			) {
+				/* quoted-printable, binary, user-defined are unsupported so far */
+				bb_error_msg_and_die("encoding '%s' not supported", encoding);
+			} else {
+				/* plain 7bit or 8bit */
+				while ((end = xmalloc_fgets(stdin)) != NULL) {
+					if ('-' == end[0]
+					 && '-' == end[1]
+					 && strncmp(end + 2, boundary, boundary_len) == 0
+					) {
+						break;
+					}
+					fputs(end, fp);
+				}
+			}
+			fclose(fp);
+
+			/* Wait for child */
+			if (opts & OPT_X) {
+				int rc;
+				signal(SIGPIPE, SIG_DFL);
+				rc = (wait4pid(pid) & 0xff);
+				if (rc != 0)
+					return rc + 20;
+			}
+
+			/* Multipart ended? */
+			if (end && '-' == end[2 + boundary_len] && '-' == end[2 + boundary_len + 1]) {
+				dbg_error_msg("FINISHED MPART:'%s'", end);
+				break;
+			}
+			dbg_error_msg("FINISHED:'%s'", end);
+			free(end);
+		} /* end of "handle one non-multipart block" */
+
+		free(header);
+	} /* while (1) */
+
+	dbg_error_msg("ENDPARSE[%s]", boundary);
+
+	return EXIT_SUCCESS;
+}
+
+//usage:#define reformime_trivial_usage
+//usage:       "[OPTIONS]"
+//usage:#define reformime_full_usage "\n\n"
+//usage:       "Parse MIME-encoded message on stdin\n"
+//usage:     "\nOptions:"
+//usage:     "\n	-x PREFIX	Extract content of MIME sections to files"
+//usage:     "\n	-X PROG ARGS	Filter content of MIME sections through PROG"
+//usage:     "\n			Must be the last option"
+//usage:     "\n"
+//usage:     "\nOther options are silently ignored"
+
+/*
+Usage: reformime [options]
+    -d - parse a delivery status notification.
+    -e - extract contents of MIME section.
+    -x - extract MIME section to a file.
+    -X - pipe MIME section to a program.
+    -i - show MIME info.
+    -s n.n.n.n - specify MIME section.
+    -r - rewrite message, filling in missing MIME headers.
+    -r7 - also convert 8bit/raw encoding to quoted-printable, if possible.
+    -r8 - also convert quoted-printable encoding to 8bit, if possible.
+    -c charset - default charset for rewriting, -o, and -O.
+    -m [file] [file]... - create a MIME message digest.
+    -h "header" - decode RFC 2047-encoded header.
+    -o "header" - encode unstructured header using RFC 2047.
+    -O "header" - encode address list header using RFC 2047.
+*/
+
+int reformime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int reformime_main(int argc UNUSED_PARAM, char **argv)
+{
+	const char *opt_prefix = "";
+
+	INIT_G();
+
+	// parse options
+	// N.B. only -x and -X are supported so far
+	opt_complementary = "x--X:X--x" IF_FEATURE_REFORMIME_COMPAT(":m::");
+	opts = getopt32(argv,
+		"x:X" IF_FEATURE_REFORMIME_COMPAT("deis:r:c:m:h:o:O:"),
+		&opt_prefix
+		IF_FEATURE_REFORMIME_COMPAT(, NULL, NULL, &G.opt_charset, NULL, NULL, NULL, NULL)
+	);
+	argv += optind;
+
+	return parse("", (opts & OPT_X) ? argv : (char **)&opt_prefix);
+}