[asterisk-commits] tilghman: branch 1.4 r148916 - /branches/1.4/apps/app_voicemail.c
SVN commits to the Asterisk project
asterisk-commits at lists.digium.com
Tue Oct 14 12:41:08 CDT 2008
Author: tilghman
Date: Tue Oct 14 12:41:08 2008
New Revision: 148916
URL: http://svn.digium.com/view/asterisk?view=rev&rev=148916
Log:
Ensure that mail headers are 7-bit clean, even when UTF-8 characters are used
in headers like 'Subject' and 'To'.
Closes AST-107.
Modified:
branches/1.4/apps/app_voicemail.c
Modified: branches/1.4/apps/app_voicemail.c
URL: http://svn.digium.com/view/asterisk/branches/1.4/apps/app_voicemail.c?view=diff&rev=148916&r1=148915&r2=148916
==============================================================================
--- branches/1.4/apps/app_voicemail.c (original)
+++ branches/1.4/apps/app_voicemail.c Tue Oct 14 12:41:08 2008
@@ -2979,6 +2979,70 @@
return tm;
}
+/*!\brief Check if the string would need encoding within the MIME standard, to
+ * avoid confusing certain mail software that expects messages to be 7-bit
+ * clean.
+ */
+static int check_mime(const char *str)
+{
+ for (; *str; str++) {
+ if (*str > 126 || *str < 32 || strchr("()<>@,:;/\"[]?.=", *str)) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*!\brief Encode a string according to the MIME rules for encoding strings
+ * that are not 7-bit clean or contain control characters.
+ *
+ * Additionally, if the encoded string would exceed the MIME limit of 76
+ * characters per line, then the encoding will be broken up into multiple
+ * sections, separated by a space character, in order to facilitate
+ * breaking up the associated header across multiple lines.
+ *
+ * \param start A string to be encoded
+ * \param end An expandable buffer for holding the result
+ * \param preamble The length of the first line already used for this string,
+ * to ensure that each line maintains a maximum length of 76 chars.
+ * \param postamble the length of any additional characters appended to the
+ * line, used to ensure proper field wrapping.
+ * \retval The encoded string.
+ */
+static char *encode_mime_str(const char *start, char *end, size_t endsize, size_t preamble, size_t postamble)
+{
+ char tmp[80];
+ int first_section = 1;
+ size_t endlen = 0, tmplen = 0;
+ *end = '\0';
+
+ tmplen = snprintf(tmp, sizeof(tmp), "=?%s?Q?", charset);
+ for (; *start; start++) {
+ int need_encoding = 0;
+ if (*start < 33 || *start > 126 || strchr("()<>@,:;/\"[]?.=_", *start)) {
+ need_encoding = 1;
+ }
+ if ((first_section && need_encoding && preamble + tmplen > 70) ||
+ (first_section && !need_encoding && preamble + tmplen > 72) ||
+ (!first_section && need_encoding && tmplen > 70) ||
+ (!first_section && !need_encoding && tmplen > 72)) {
+ /* Start new line */
+ endlen += snprintf(end + endlen, endsize - endlen, "%s%s?=", first_section ? "" : " ", tmp);
+ tmplen = snprintf(tmp, sizeof(tmp), "=?%s?Q?", charset);
+ first_section = 0;
+ }
+ if (need_encoding && *start == ' ') {
+ tmplen += snprintf(tmp + tmplen, sizeof(tmp) - tmplen, "_");
+ } else if (need_encoding) {
+ tmplen += snprintf(tmp + tmplen, sizeof(tmp) - tmplen, "=%hhX", *start);
+ } else {
+ tmplen += snprintf(tmp + tmplen, sizeof(tmp) - tmplen, "%c", *start);
+ }
+ }
+ snprintf(end + endlen, endsize - endlen, "%s%s?=%s", first_section ? "" : " ", tmp, endlen + postamble > 74 ? " " : "");
+ return end;
+}
+
static void make_email_file(FILE *p, char *srcemail, struct ast_vm_user *vmu, int msgnum, char *context, char *mailbox, char *cidnum, char *cidname, char *attach, char *format, int duration, int attach_user_voicemail, struct ast_channel *chan, const char *category, int imap)
{
char date[256];
@@ -2990,14 +3054,28 @@
char tmpcmd[256];
char enc_cidnum[256] = "", enc_cidname[256] = "";
struct tm tm;
- char *passdata2;
- size_t len_passdata;
+ char *passdata = NULL, *passdata2;
+ size_t len_passdata, len_passdata2, tmplen;
#ifdef IMAP_STORAGE
#define ENDL "\r\n"
#else
#define ENDL "\n"
#endif
+ /* One alloca for multiple fields */
+ len_passdata2 = strlen(vmu->fullname);
+ if (emailsubject && (tmplen = strlen(emailsubject)) > len_passdata2) {
+ len_passdata2 = tmplen;
+ }
+ if ((tmplen = strlen(emailtitle)) > len_passdata2) {
+ len_passdata2 = tmplen;
+ }
+ if ((tmplen = strlen(fromstring)) > len_passdata2) {
+ len_passdata2 = tmplen;
+ }
+ len_passdata2 = len_passdata2 * 3 + 200;
+ passdata2 = alloca(len_passdata2);
+
if (cidnum) {
strip_control(cidnum, enc_cidnum, sizeof(enc_cidnum));
}
@@ -3020,37 +3098,71 @@
if (*fromstring) {
struct ast_channel *ast;
if ((ast = ast_channel_alloc(0, AST_STATE_DOWN, 0, 0, "", "", "", 0, 0))) {
- char *passdata;
- int vmlen = strlen(fromstring)*3 + 200;
- if ((passdata = alloca(vmlen))) {
- memset(passdata, 0, vmlen);
- prep_email_sub_vars(ast, vmu, msgnum + 1, context, mailbox, enc_cidnum, enc_cidname, dur, date, passdata, vmlen, category);
- pbx_substitute_variables_helper(ast, fromstring, passdata, vmlen);
- len_passdata = strlen(passdata) * 2 + 3;
- passdata2 = alloca(len_passdata);
- fprintf(p, "From: %s <%s>" ENDL, quote(passdata, passdata2, len_passdata), who);
- } else
- ast_log(LOG_WARNING, "Cannot allocate workspace for variable substitution\n");
+ char *ptr;
+ memset(passdata2, 0, len_passdata2);
+ prep_email_sub_vars(ast, vmu, msgnum + 1, context, mailbox, enc_cidnum, enc_cidname, dur, date, passdata2, len_passdata2, category);
+ pbx_substitute_variables_helper(ast, fromstring, passdata2, len_passdata2);
+ len_passdata = strlen(passdata2) * 3 + 300;
+ passdata = alloca(len_passdata);
+ if (check_mime(passdata2)) {
+ int first_line = 1;
+ encode_mime_str(passdata2, passdata, len_passdata, strlen("From: "), strlen(who) + 3);
+ while ((ptr = strchr(passdata, ' '))) {
+ *ptr = '\0';
+ fprintf(p, "%s %s" ENDL, first_line ? "From:" : "", passdata);
+ first_line = 0;
+ passdata = ptr + 1;
+ }
+ fprintf(p, "%s %s <%s>" ENDL, first_line ? "From:" : "", passdata, who);
+ } else {
+ fprintf(p, "From: %s <%s>" ENDL, quote(passdata, passdata2, len_passdata2), who);
+ }
ast_channel_free(ast);
} else
ast_log(LOG_WARNING, "Cannot allocate the channel for variables substitution\n");
} else
fprintf(p, "From: Asterisk PBX <%s>" ENDL, who);
- len_passdata = strlen(vmu->fullname) * 2 + 3;
- passdata2 = alloca(len_passdata);
- fprintf(p, "To: %s <%s>" ENDL, quote(vmu->fullname, passdata2, len_passdata), vmu->email);
+
+ if (check_mime(vmu->fullname)) {
+ int first_line = 1;
+ char *ptr;
+ encode_mime_str(vmu->fullname, passdata2, len_passdata2, strlen("To: "), strlen(vmu->email) + 3);
+ while ((ptr = strchr(passdata2, ' '))) {
+ *ptr = '\0';
+ fprintf(p, "%s %s" ENDL, first_line ? "To:" : "", passdata2);
+ first_line = 0;
+ passdata2 = ptr + 1;
+ }
+ fprintf(p, "%s %s <%s>" ENDL, first_line ? "To:" : "", passdata2, vmu->email);
+ } else {
+ fprintf(p, "To: %s <%s>" ENDL, quote(vmu->fullname, passdata2, len_passdata2), vmu->email);
+ }
if (emailsubject) {
struct ast_channel *ast;
if ((ast = ast_channel_alloc(0, AST_STATE_DOWN, 0, 0, "", "", "", 0, 0))) {
- char *passdata;
- int vmlen = strlen(emailsubject)*3 + 200;
- if ((passdata = alloca(vmlen))) {
- memset(passdata, 0, vmlen);
- prep_email_sub_vars(ast, vmu, msgnum + 1, context, mailbox, cidnum, cidname, dur, date, passdata, vmlen, category);
- pbx_substitute_variables_helper(ast, emailsubject, passdata, vmlen);
+ int vmlen = strlen(emailsubject) * 3 + 200;
+ /* Only allocate more space if the previous was not large enough */
+ if (vmlen > len_passdata) {
+ passdata = alloca(vmlen);
+ len_passdata = vmlen;
+ }
+
+ memset(passdata, 0, len_passdata);
+ prep_email_sub_vars(ast, vmu, msgnum + 1, context, mailbox, cidnum, cidname, dur, date, passdata, len_passdata, category);
+ pbx_substitute_variables_helper(ast, emailsubject, passdata, len_passdata);
+ if (check_mime(passdata)) {
+ int first_line = 1;
+ char *ptr;
+ encode_mime_str(passdata, passdata2, len_passdata2, strlen("Subject: "), 0);
+ while ((ptr = strchr(passdata2, ' '))) {
+ *ptr = '\0';
+ fprintf(p, "%s %s" ENDL, first_line ? "Subject:" : "", passdata2);
+ first_line = 0;
+ passdata2 = ptr + 1;
+ }
+ fprintf(p, "%s %s" ENDL, first_line ? "Subject:" : "", passdata2);
+ } else {
fprintf(p, "Subject: %s" ENDL, passdata);
- } else {
- ast_log(LOG_WARNING, "Cannot allocate workspace for variable substitution\n");
}
ast_channel_free(ast);
} else {
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