mirror of https://github.com/leahneukirchen/mblaze
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594 lines
12 KiB
C
594 lines
12 KiB
C
#include <sys/stat.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <pwd.h>
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#include <search.h>
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#include <stdint.h>
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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 <strings.h>
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#include <time.h>
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#include <unistd.h>
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#include "blaze822.h"
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#include "xpledge.h"
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static int cflag;
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static int rflag;
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static char *tflag = "multipart/mixed";
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int gen_b64(uint8_t *s, off_t size)
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{
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static char *b64 =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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off_t i;
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int l;
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uint32_t v;
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for (i = 0, l = 0; i+2 < size; i += 3) {
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v = (s[i] << 16) | (s[i+1] << 8) | s[i+2];
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putc_unlocked(b64[(v & 0xfc0000) >> 18], stdout);
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putc_unlocked(b64[(v & 0x03f000) >> 12], stdout);
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putc_unlocked(b64[(v & 0x000fc0) >> 6], stdout);
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putc_unlocked(b64[(v & 0x3f)], stdout);
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l += 4;
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if (l > 72) {
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l = 0;
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printf("\n");
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}
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}
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if (size - i == 2) { // 2 bytes left, XXX=
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v = (s[size - 2] << 16) | (s[size - 1] << 8);
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putc_unlocked(b64[(v & 0xfc0000) >> 18], stdout);
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putc_unlocked(b64[(v & 0x03f000) >> 12], stdout);
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putc_unlocked(b64[(v & 0x000fc0) >> 6], stdout);
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putc_unlocked('=', stdout);
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} else if (size - i == 1) { // 1 byte left, XX==
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v = s[size - 1] << 16;
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putc_unlocked(b64[(v & 0xfc0000) >> 18], stdout);
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putc_unlocked(b64[(v & 0x03f000) >> 12], stdout);
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putc_unlocked('=', stdout);
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putc_unlocked('=', stdout);
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}
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printf("\n");
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return 0;
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}
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#define qphrasevalid(c) ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || \
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(c >= 'a' && c <= 'z') || \
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c == '!' || c == '*' || c == '+' || c == '-' || \
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c == '/')
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size_t
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gen_qp(uint8_t *s, off_t size, size_t maxlinelen, size_t linelen)
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{
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off_t i;
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int header = linelen > 0;
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char prev = 0;
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for (i = 0; i < size; i++) {
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// inspect utf8 sequence to not wrap in between multibyte
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int mb;
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if ((s[i] & 0x80) == 0) mb = 3;
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else if ((s[i] & 0xc0) == 0x80) mb = 3;
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else if ((s[i] & 0xe0) == 0xc0) mb = 6;
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else if ((s[i] & 0xf0) == 0xe0) mb = 9;
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else if ((s[i] & 0xf8) == 0xf0) mb = 12;
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else mb = 3;
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if (linelen >= maxlinelen-mb-!!header) {
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linelen = 0;
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prev = '\n';
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if (header) {
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printf("?=\n =?UTF-8?Q?");
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linelen += 11;
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} else {
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puts("=");
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}
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}
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if ((s[i] > 126) ||
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(s[i] == '=') ||
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(linelen == 0 &&
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(strncmp((char *)s, "From ", 5) == 0 ||
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(s[i] == '.' && i+1 < size &&
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(s[i+1] == '\n' || s[i+1] == '\r'))))) {
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printf("=%02X", s[i]);
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linelen += 3;
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prev = s[i];
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} else if (header &&
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(s[i] == '\n' || s[i] == '\t' || s[i] == '_')) {
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printf("=%02X", s[i]);
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linelen += 3;
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prev = '_';
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} else if (header && s[i] == ' ') {
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putc_unlocked('_', stdout);
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linelen++;
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prev = '_';
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} else if (s[i] < 33 && s[i] != '\n') {
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if ((s[i] == ' ' || s[i] == '\t') &&
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i+1 < size &&
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(s[i+1] != '\n' && s[i+1] != '\r')) {
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putc_unlocked(s[i], stdout);
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linelen += 1;
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prev = s[i];
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} else {
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printf("=%02X", s[i]);
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linelen += 3;
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prev = '_';
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}
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} else if (s[i] == '\n') {
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if (prev == ' ' || prev == '\t')
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puts("=");
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putc_unlocked('\n', stdout);
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linelen = 0;
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prev = 0;
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} else if (header && !qphrasevalid(s[i])) {
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printf("=%02X", s[i]);
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linelen += 3;
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prev = '_';
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} else {
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putc_unlocked(s[i], stdout);
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linelen++;
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prev = s[i];
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}
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}
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if (linelen > 0 && !header)
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puts("=");
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return linelen;
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}
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static const char *
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basenam(const char *s)
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{
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char *r = strrchr(s, '/');
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return r ? r + 1 : s;
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}
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static void
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gen_attachment(const char *filename, char *content_disposition)
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{
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const char *s = filename;
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int quote = 0;
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if (!*filename) {
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printf("Content-Disposition: %s\n", content_disposition);
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return;
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}
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for (s = (char *)filename; *s; s++) {
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if (*s < 32 || *s == '"' || *s >= 127 || s - filename > 35)
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goto rfc2231;
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if (strchr(" ()<>@,;:\\/[]?=", *s))
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quote = 1;
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}
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// filename SHOULD be an atom if possible
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printf("Content-Disposition: %s; filename=%s%s%s\n", content_disposition,
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quote ? "\"" : "", filename, quote ? "\"" : "");
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return;
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rfc2231:
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printf("Content-Disposition: %s", content_disposition);
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int i = 0;
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int d = 0;
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s = filename;
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while (*s) {
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i = printf(";\n filename*%d*=", d);
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if (d++ == 0) {
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printf("UTF-8''");
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i += 7;
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}
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while (*s && i < 78 - 3) {
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if (*s <= 32 || *s == '"' || *s > 126)
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i += printf("%%%02x", (uint8_t)*s++);
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else
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i += printf("%c", (uint8_t)*s++);
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}
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}
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printf("\n");
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}
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int
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gen_file(char *file, char *ct)
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{
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uint8_t *content;
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off_t size;
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char *cd = "attachment";
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char *s = strchr(ct, '#');
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if (s) {
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*s = 0;
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cd = s + 1;
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}
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const char *filename = basenam(file);
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s = strchr(file, '>');
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if (s) {
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*s = 0;
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filename = s + 1;
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}
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int r = slurp(file, (char **)&content, &size);
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if (r != 0) {
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fprintf(stderr, "mmime: error attaching file '%s': %s\n",
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file, strerror(r));
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return -1;
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}
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if (strcmp(ct, "mblaze/raw") == 0)
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goto raw;
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off_t bithigh = 0;
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off_t bitlow = 0;
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off_t linelen = 0;
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off_t maxlinelen = 0;
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off_t i;
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for (i = 0; i < size; i++) {
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if (content[i] == '\n') {
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if (maxlinelen < linelen)
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maxlinelen = linelen;
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linelen = 0;
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} else {
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linelen++;
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}
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if (content[i] != '\t' && content[i] != '\n' && content[i] < 32)
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bitlow++;
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if (content[i] > 127)
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bithigh++;
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}
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gen_attachment(filename, cd);
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if (strcmp(ct, "message/rfc822") == 0) {
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printf("Content-Type: %s\n", ct);
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printf("Content-Transfer-Encoding: %dbit\n\n",
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(bitlow > 0 || bithigh > 0) ? 8 : 7);
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fwrite(content, 1, size, stdout);
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return 0;
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}
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if (bitlow == 0 && bithigh == 0 &&
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maxlinelen <= 78) {
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if (!ct)
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ct = "text/plain";
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printf("Content-Type: %s\n", ct);
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printf("Content-Transfer-Encoding: 7bit\n\n");
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raw:
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fwrite(content, 1, size, stdout);
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return 0;
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} else if (bitlow == 0 && bithigh == 0) {
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if (!ct)
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ct = "text/plain";
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printf("Content-Type: %s\n", ct);
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printf("Content-Transfer-Encoding: quoted-printable\n\n");
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gen_qp(content, size, 78, 0);
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return 0;
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} else if (bitlow > size/10 || bithigh > size/4) {
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if (!ct)
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ct = "application/binary";
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printf("Content-Type: %s\n", ct);
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printf("Content-Transfer-Encoding: base64\n\n");
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return gen_b64(content, size);
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} else {
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if (!ct)
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ct = "text/plain";
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printf("Content-Type: %s\n", ct);
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printf("Content-Transfer-Encoding: quoted-printable\n\n");
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gen_qp(content, size, 78, 0);
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return 0;
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}
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}
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void
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print_header(char *line) {
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char *s, *e;
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size_t l = strlen(line);
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if (l == 0)
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return;
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if (line[l-1] == '\n')
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line[l-1] = 0;
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/* iterate word-wise, encode words when needed. */
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s = line;
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if (!(*s == ' ' || *s == '\t')) {
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// raw header name
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while (*s && *s != ':')
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putc_unlocked(*s++, stdout);
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if (*s == ':')
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putc_unlocked(*s++, stdout);
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}
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int prevq = 0; // was the previous word encoded as qp?
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char prevqs = 0; // was the previous word a quoted-string?
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ssize_t linelen = s - line;
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while (*s) {
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size_t highbit = 0;
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int qs = 0;
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e = s;
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while (*e && *e == ' ')
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e++;
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if (*e == '"') { // scan quoted-string, encode at once
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s = e;
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for (e++; *e && *e != '"'; e++) {
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if (*e == '\\')
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e++;
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if ((uint8_t)*e >= 127)
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highbit++;
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}
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if (*e == '"')
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e++;
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qs = 1;
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} else { // scan word
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while (*e && *e == ' ')
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e++;
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for (; *e && *e != ' '; e++) {
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if ((uint8_t)*e >= 127)
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highbit++;
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}
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}
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if (!highbit) {
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if (e-s >= 998)
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goto force_qp;
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if (e-s >= 78 - linelen && linelen > 0) {
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// wrap in advance before long word
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printf("\n");
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linelen = 0;
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}
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if (linelen <= 1 && s[0] == ' ' && s[1] == ' ') {
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// space at beginning of line
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goto force_qp;
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}
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if (*s != ' ' && !(prevqs && !prevq && *(s-1) != ' ')) {
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printf(" ");
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linelen++;
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}
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fwrite(s, 1, e-s, stdout);
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linelen += e-s;
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prevq = 0;
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} else {
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force_qp:
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if (!prevq && *s == ' ')
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s++;
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if (qs && *s == '"')
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s++;
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if (qs && e > s && *(e-1) == '"')
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e--;
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if (linelen >= 78 - 13 - 4 ||
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(e-s < (78 - 13)/3 &&
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e-s >= (78 - linelen - 13)/3)) {
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// wrap in advance
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printf("\n");
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linelen = 0;
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}
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printf(" =?UTF-8?Q?");
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linelen += 11;
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linelen = gen_qp((uint8_t *)s, e-s, 78, linelen);
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printf("?=");
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linelen += 2;
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prevq = 1;
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if (qs && *e == '"')
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e++;
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}
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prevqs = qs;
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s = e;
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}
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printf("\n");
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}
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static int
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valid_content_type(char *s)
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{
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int slash = 0;
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for (; *s; s++)
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if (*s == '/')
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slash++;
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else if (isalnum(*s) || *s == '-' || *s == '+' || *s == '.' ||
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*s == ';' || *s == '=' || *s == '#')
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; /* ok */
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else
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return 0;
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return slash == 1;
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}
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int
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gen_build()
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{
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char sep[100];
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snprintf(sep, sizeof sep, "----_=_%08lx%08lx%08lx_=_",
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lrand48(), lrand48(), lrand48());
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char *line = 0;
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size_t linelen = 0;
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int inheader = 1;
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int intext = 0;
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int emptybody = 1;
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int ret = 0;
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char *contenttype = 0;
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char *contenttransferenc = 0;
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while (1) {
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ssize_t read = getdelim(&line, &linelen, '\n', stdin);
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if (read == -1) {
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if (feof(stdin)) {
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if (!emptybody)
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break;
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line = strdup(inheader ? "\n" : "");
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} else { // errored
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exit(1);
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}
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}
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if (inheader) {
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if (line[0] == '\n') {
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inheader = 0;
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printf("MIME-Version: 1.0\n");
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if (rflag) {
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printf("Content-Type:%s", contenttype ? contenttype : " text/plain; charset=UTF-8\n");
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printf("Content-Transfer-Encoding:%s", contenttransferenc ? contenttransferenc : " quoted-printable\n");
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printf("\n");
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} else {
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printf("Content-Type: %s; boundary=\"%s\"\n", tflag, sep);
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printf("\n");
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printf("This is a multipart message in MIME format.\n");
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}
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} else {
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if (strncasecmp(line, "Content-Type:", 13) == 0) {
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free(contenttype);
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contenttype = strdup(line+13);
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} else if (strncasecmp(line, "Content-Transfer-Encoding:", 26) == 0) {
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free(contenttransferenc);
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contenttransferenc = strdup(line+26);
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} else {
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print_header(line);
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}
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}
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continue;
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}
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if (!rflag && line[0] == '#') {
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char *f = strchr(line, ' ');
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if (f) {
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char of = *f;
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*f = 0;
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if (valid_content_type(line+1)) {
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printf("\n--%s\n", sep);
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if (line[read-1] == '\n')
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line[read-1] = 0;
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if (gen_file(f+1, line+1) != 0)
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ret = 1;
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intext = 0;
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emptybody = 0;
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continue;
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}
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*f = of;
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}
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}
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if (!rflag && !intext) {
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printf("\n--%s\n", sep);
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printf("Content-Type:%s", contenttype ? contenttype : " text/plain; charset=UTF-8\n");
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printf("Content-Disposition: inline\n");
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printf("Content-Transfer-Encoding:%s", contenttransferenc ? contenttransferenc : " quoted-printable\n");
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printf("\n");
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intext = 1;
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}
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if (contenttransferenc)
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printf("%s", line);
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else
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gen_qp((uint8_t *)line, strlen(line), 78, 0);
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emptybody = 0;
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}
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if (!rflag && !inheader)
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printf("\n--%s--\n", sep);
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free(line);
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return ret;
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}
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int
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check()
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{
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off_t bithigh = 0;
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off_t bitlow = 0;
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off_t linelen = 0;
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off_t maxheadlinelen = 0;
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off_t maxbodylinelen = 0;
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off_t bodylinelenlimit = getenv("MBLAZE_RELAXED_MIME") ? 998 : 78;
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int c;
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int l = -1;
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while ((c = getchar()) != EOF) {
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if (c == '\n') {
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if (maxheadlinelen < linelen)
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maxheadlinelen = linelen;
|
|
linelen = 0;
|
|
if (l == '\n')
|
|
break;
|
|
} else {
|
|
linelen++;
|
|
}
|
|
if (c != '\t' && c != '\n' && c < 32)
|
|
bitlow++;
|
|
if (c > 127)
|
|
bithigh++;
|
|
l = c;
|
|
}
|
|
|
|
while ((c = getchar()) != EOF) {
|
|
if (c == '\n') {
|
|
if (maxbodylinelen < linelen)
|
|
maxbodylinelen = linelen;
|
|
linelen = 0;
|
|
} else {
|
|
linelen++;
|
|
}
|
|
if (c != '\t' && c != '\n' && c < 32)
|
|
bitlow++;
|
|
if (c > 127)
|
|
bithigh++;
|
|
l = c;
|
|
}
|
|
|
|
if (bitlow == 0 && bithigh == 0 &&
|
|
maxheadlinelen < 998 && maxbodylinelen <= bodylinelenlimit &&
|
|
l == '\n')
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
srand48(time(0) ^ getpid());
|
|
|
|
int c;
|
|
while ((c = getopt(argc, argv, "crt:")) != -1)
|
|
switch (c) {
|
|
case 'r': rflag = 1; break;
|
|
case 'c': cflag = 1; break;
|
|
case 't': tflag = optarg; break;
|
|
default:
|
|
usage:
|
|
fprintf(stderr,
|
|
"Usage: mmime [-c|-r] [-t CONTENT-TYPE] < message\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (argc != optind)
|
|
goto usage;
|
|
|
|
xpledge("stdio rpath", "");
|
|
|
|
if (cflag)
|
|
return check();
|
|
|
|
return gen_build();
|
|
}
|