mirror of git://git.sysmocom.de/ofono
cbs: Allow the last CBS fragment to be truncated
That does happen in real life.
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@ -1756,7 +1756,7 @@ gboolean sms_udh_iter_init_from_cbs(const struct cbs *cbs,
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return FALSE;
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hdr = cbs->ud;
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max_ud_len = 82;
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max_ud_len = cbs->udlen;
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/* Must have at least one information-element if udhi is true */
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if (hdr[0] < 2)
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@ -3862,8 +3862,8 @@ gboolean cbs_dcs_decode(guint8 dcs, gboolean *udhi, enum sms_class *cls,
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gboolean cbs_decode(const unsigned char *pdu, int len, struct cbs *out)
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{
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/* CBS is always a fixed length of 88 bytes */
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if (len != 88)
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/* CBS is (almost) always a fixed length of 88 bytes */
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if (len < 6 || len > 88)
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return FALSE;
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out->gs = (enum cbs_geo_scope) ((pdu[0] >> 6) & 0x03);
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@ -3874,6 +3874,10 @@ gboolean cbs_decode(const unsigned char *pdu, int len, struct cbs *out)
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out->max_pages = pdu[5] & 0xf;
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out->page = (pdu[5] >> 4) & 0xf;
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/* Allow the last fragment to be truncated */
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if (len != 88 && out->max_pages != out->page)
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return FALSE;
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/*
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* If a mobile receives the code 0000 in either the first field or
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* the second field then it shall treat the CBS message exactly the
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@ -3885,7 +3889,10 @@ gboolean cbs_decode(const unsigned char *pdu, int len, struct cbs *out)
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out->page = 1;
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}
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memcpy(out->ud, pdu + 6, 82);
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out->udlen = (guint8)(len - 6);
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memcpy(out->ud, pdu + 6, out->udlen);
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if (out->udlen < 82)
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memset(out->ud + out->udlen, 0, 82 - out->udlen);
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return TRUE;
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}
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@ -4078,7 +4085,7 @@ char *cbs_decode_text(GSList *cbs_list, char *iso639_lang)
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if (iso639)
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bufsize -= 3;
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} else {
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bufsize += 82;
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bufsize += cbs->udlen;
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if (iso639)
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bufsize -= 2;
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@ -4095,7 +4102,7 @@ char *cbs_decode_text(GSList *cbs_list, char *iso639_lang)
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if (sms_udh_iter_init_from_cbs(cbs, &iter))
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taken = sms_udh_iter_get_udh_length(&iter) + 1;
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unpack_7bit_own_buf(cbs->ud + taken, 82 - taken,
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unpack_7bit_own_buf(cbs->ud + taken, cbs->udlen - taken,
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taken, false, 2,
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NULL, 0,
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(unsigned char *)iso639_lang);
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@ -4128,7 +4135,7 @@ char *cbs_decode_text(GSList *cbs_list, char *iso639_lang)
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max_chars =
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sms_text_capacity_gsm(CBS_MAX_GSM_CHARS, taken);
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unpack_7bit_own_buf(ud + taken, 82 - taken,
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unpack_7bit_own_buf(ud + taken, cbs->udlen - taken,
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taken, false, max_chars,
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&written, 0, unpacked);
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@ -4162,7 +4169,7 @@ char *cbs_decode_text(GSList *cbs_list, char *iso639_lang)
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* the check here since the specification isn't clear
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*/
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} else {
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int num_ucs2_chars = (82 - taken) >> 1;
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int num_ucs2_chars = (cbs->udlen - taken) >> 1;
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int i = taken;
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int max_offset = taken + num_ucs2_chars * 2;
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@ -408,6 +408,7 @@ struct cbs {
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guint8 dcs; /* 8 bits */
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guint8 max_pages; /* 4 bits */
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guint8 page; /* 4 bits */
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guint8 udlen;
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guint8 ud[82];
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};
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