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