From e4e2e0eb20794972b8d4c89dcfeb6c257c45c3a1 Mon Sep 17 00:00:00 2001 From: Lukas Fleischer Date: Tue, 7 Feb 2017 17:52:14 +0100 Subject: Gracefully parse iCal parameters with colons MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit According to RFC 5545, iCalendar content lines can have optional parameters, which can be quoted strings containing colons (":"). Make sure that such colons are not interpreted as delimiters marking the start of the value string. Also, add a test case that covers this corner case. Reported-by: Håkan Jerning Signed-off-by: Lukas Fleischer --- src/ical.c | 36 ++++++++++++++++++++++++------------ 1 file changed, 24 insertions(+), 12 deletions(-) (limited to 'src/ical.c') diff --git a/src/ical.c b/src/ical.c index f17b1cf..c2c8c5b 100644 --- a/src/ical.c +++ b/src/ical.c @@ -670,6 +670,21 @@ static long ical_compute_rpt_until(long start, ical_rpt_t * rpt) } } +/* + * Skip to the value part of an iCalendar content line. + */ +static char *ical_get_value(char *p) +{ + for (; *p != ':'; p++) { + if (*p == '\0') + return NULL; + if (*p == '"') + for (p++; *p != '"'; p++); + } + + return p + 1; +} + /* * Read a recurrence rule from an iCalendar RRULE string. * @@ -717,14 +732,13 @@ static ical_rpt_t *ical_read_rrule(FILE * log, char *rrulestr, ical_rpt_t *rpt; char *p; - p = strchr(rrulestr, ':'); + p = ical_get_value(rrulestr); if (!p) { ical_log(log, ICAL_VEVENT, itemline, _("recurrence rule malformed.")); (*noskipped)++; return NULL; } - p++; rpt = mem_malloc(sizeof(ical_rpt_t)); memset(rpt, 0, sizeof(ical_rpt_t)); @@ -807,14 +821,13 @@ ical_read_exdate(llist_t * exc, FILE * log, char *exstr, { char *p, *q; - p = strchr(exstr, ':'); + p = ical_get_value(exstr); if (!p) { ical_log(log, ICAL_VEVENT, itemline, _("recurrence exception dates malformed.")); (*noskipped)++; return; } - p++; while ((q = strchr(p, ',')) != NULL) { char buf[BUFSIZ]; @@ -835,14 +848,13 @@ static char *ical_read_note(char *line, unsigned *noskipped, { char *p, *notestr, *note; - p = strchr(line, ':'); + p = ical_get_value(line); if (!p) { ical_log(log, item_type, itemline, _("description malformed.")); (*noskipped)++; return NULL; } - p++; notestr = ical_unformat_line(p); if (notestr == NULL) { @@ -865,11 +877,11 @@ static char *ical_read_summary(char *line) { char *p, *summary; - p = strchr(line, ':'); + p = ical_get_value(line); if (!p) return NULL; - summary = ical_unformat_line(p + 1); + summary = ical_unformat_line(p); if (!summary) return NULL; @@ -970,28 +982,28 @@ ical_read_event(FILE * fdi, FILE * log, unsigned *noevents, } if (starts_with_ci(buf, "DTSTART")) { - p = strchr(buf, ':'); + p = ical_get_value(buf); if (!p) { ical_log(log, ICAL_VEVENT, ITEMLINE, _("event start time malformed.")); goto cleanup; } - vevent.start = ical_datetime2time_t(++p, &vevent_type); + vevent.start = ical_datetime2time_t(p, &vevent_type); if (!vevent.start) { ical_log(log, ICAL_VEVENT, ITEMLINE, _("could not retrieve event start time.")); goto cleanup; } } else if (starts_with_ci(buf, "DTEND")) { - p = strchr(buf, ':'); + p = ical_get_value(buf); if (!p) { ical_log(log, ICAL_VEVENT, ITEMLINE, _("event end time malformed.")); goto cleanup; } - vevent.end = ical_datetime2time_t(++p, &vevent_type); + vevent.end = ical_datetime2time_t(p, &vevent_type); if (!vevent.end) { ical_log(log, ICAL_VEVENT, ITEMLINE, _("could not retrieve event end time.")); -- cgit v1.2.3