Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 725 insertions, 0 deletions

diff --git a/third_party/sipcc/sdp_utils.c b/third_party/sipcc/sdp_utils.c
new file mode 100644
index 0000000000..a5b558282e
--- /dev/null
+++ b/third_party/sipcc/sdp_utils.c
@@ -0,0 +1,725 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <errno.h>
+#include <limits.h>
+#include <ctype.h>
+#include "sdp_os_defs.h"
+#include "sipcc_sdp.h"
+#include "sdp_private.h"
+#include "sdp_log.h"
+
+#define MKI_BUF_LEN 4
+
+static const char* logTag = "sdp_utils";
+
+// Actually checks for ASCII only unlike isdigit() on Windows.
+// Also avoids UB issues with isdigit() sign extension when
+// char is signed.
+int sdp_is_ascii_digit(const char c) {
+  return '0' <= c && c <= '9';
+}
+
+sdp_mca_t *sdp_alloc_mca (uint32_t line) {
+    sdp_mca_t           *mca_p;
+
+    /* Allocate resource for new media stream. */
+    mca_p = (sdp_mca_t *)SDP_MALLOC(sizeof(sdp_mca_t));
+    if (mca_p == NULL) {
+        return (NULL);
+    }
+    /* Initialize mca structure */
+    mca_p->media              = SDP_MEDIA_INVALID;
+    mca_p->conn.nettype       = SDP_NT_INVALID;
+    mca_p->conn.addrtype      = SDP_AT_INVALID;
+    mca_p->conn.conn_addr[0]  = '\0';
+    mca_p->conn.is_multicast  = FALSE;
+    mca_p->conn.ttl           = 0;
+    mca_p->conn.num_of_addresses = 0;
+    mca_p->transport          = SDP_TRANSPORT_INVALID;
+    mca_p->port               = SDP_INVALID_VALUE;
+    mca_p->num_ports          = SDP_INVALID_VALUE;
+    mca_p->vpi                = SDP_INVALID_VALUE;
+    mca_p->vci                = 0;
+    mca_p->vcci               = SDP_INVALID_VALUE;
+    mca_p->cid                = SDP_INVALID_VALUE;
+    mca_p->num_payloads       = 0;
+    mca_p->sessinfo_found     = FALSE;
+    mca_p->encrypt.encrypt_type  = SDP_ENCRYPT_INVALID;
+    mca_p->media_attrs_p      = NULL;
+    mca_p->next_p             = NULL;
+    mca_p->mid                = 0;
+    mca_p->bw.bw_data_count   = 0;
+    mca_p->bw.bw_data_list    = NULL;
+    mca_p->line_number        = line;
+    mca_p->sctp_fmt           = SDP_SCTP_MEDIA_FMT_UNKNOWN;
+
+    return (mca_p);
+}
+
+/*
+ * next_token
+ *
+ * copy token param with chars from str until null, cr, lf, or one of the delimiters is found.
+ * delimiters at the beginning will be skipped.
+ * The pointer *string_of_tokens is moved forward to the next token on sucess.
+ *
+ */
+static sdp_result_e next_token(const char **string_of_tokens, char *token, unsigned token_max_len, const char *delim)
+{
+  int flag2moveon = 0;
+  const char *str;
+  const char *token_end;
+  const char *next_delim;
+
+  if (!string_of_tokens || !*string_of_tokens || !token || !delim) {
+    return SDP_FAILURE;
+  }
+
+  str = *string_of_tokens;
+  token_end = token + token_max_len - 1;
+
+  /* Locate front of token, skipping any delimiters */
+  for ( ; ((*str != '\0') && (*str != '\n') && (*str != '\r')); str++) {
+    flag2moveon = 1;  /* Default to move on unless we find a delimiter */
+    for (next_delim=delim; *next_delim; next_delim++) {
+      if (*str == *next_delim) {
+        flag2moveon = 0;
+        break;
+      }
+    }
+    if( flag2moveon ) {
+      break;  /* We're at the beginning of the token */
+    }
+  }
+
+  /* Make sure there's really a token present. */
+  if ((*str == '\0') || (*str == '\n') || (*str == '\r')) {
+    return SDP_EMPTY_TOKEN;
+  }
+
+  /* Now locate end of token */
+  flag2moveon = 0;
+
+  while ((token < token_end) &&
+         (*str != '\0') && (*str != '\n') && (*str != '\r')) {
+      for (next_delim=delim; *next_delim; next_delim++) {
+          if (*str == *next_delim) {
+              flag2moveon = 1;
+              break;
+          }
+      }
+      if( flag2moveon ) {
+          break;
+      } else {
+          *token++ = *str++;
+      }
+  }
+
+  /* mark end of token */
+  *token = '\0';
+
+  /* set the string of tokens to the next token */
+  *string_of_tokens = str;
+
+  return SDP_SUCCESS;
+}
+
+/*
+ * verify_sdescriptions_mki
+ *
+ * Verifies the syntax of the MKI parameter.
+ *
+ * mki            = mki-value ":" mki-length
+ * mki-value      = 1*DIGIT
+ * mki-length     = 1*3DIGIT   ; range 1..128
+ *
+ * Inputs:
+ *   buf      - ptr to start of MKI string assumes NULL
+ *              terminated string
+ *   mkiValue - buffer to store the MKI value, assumes calling
+ *              function has provided memory for this.
+ *   mkiLen   - integer to store the MKI length
+ *
+ * Outputs:
+ *   Returns TRUE if syntax is correct and stores the
+ *   MKI value in mkiVal and stores the length in mkiLen.
+ *   Returns FALSE otherwise.
+ */
+
+tinybool
+verify_sdescriptions_mki (char *buf, char *mkiVal, uint16_t *mkiLen)
+{
+
+    char       *ptr,
+               mkiValBuf[SDP_SRTP_MAX_MKI_SIZE_BYTES],
+               mkiLenBuf[MKI_BUF_LEN];
+    int        idx = 0;
+    unsigned long strtoul_result;
+    char *strtoul_end;
+
+    ptr = buf;
+    /* MKI must begin with a digit */
+    if (!ptr || (!sdp_is_ascii_digit(*ptr))) {
+        return FALSE;
+    }
+
+    /* scan until we reach a non-digit or colon */
+    while (*ptr) {
+        if (*ptr == ':') {
+            /* terminate the MKI value */
+            mkiValBuf[idx] = 0;
+            ptr++;
+            break;
+        } else if ((sdp_is_ascii_digit(*ptr) && (idx < SDP_SRTP_MAX_MKI_SIZE_BYTES-1))) {
+             mkiValBuf[idx++] = *ptr;
+        } else {
+             return FALSE;
+        }
+
+        ptr++;
+    }
+
+    /* there has to be a mki length */
+    if (*ptr == 0) {
+        return FALSE;
+    }
+
+    idx = 0;
+
+    /* verify the mki length (max 3 digits) */
+    while (*ptr) {
+        if (sdp_is_ascii_digit(*ptr) && (idx < 3)) {
+            mkiLenBuf[idx++] = *ptr;
+        } else {
+            return FALSE;
+        }
+
+        ptr++;
+    }
+
+    mkiLenBuf[idx] = 0;
+
+    errno = 0;
+    strtoul_result = strtoul(mkiLenBuf, &strtoul_end, 10);
+
+    /* mki len must be between 1..128 */
+    if (errno || mkiLenBuf == strtoul_end || strtoul_result < 1 || strtoul_result > 128) {
+      *mkiLen = 0;
+      return FALSE;
+    }
+
+    *mkiLen = (uint16_t) strtoul_result;
+    sstrncpy(mkiVal, mkiValBuf, MKI_BUF_LEN);
+
+    return TRUE;
+}
+
+/*
+ * verify_srtp_lifetime
+ *
+ * Verifies the Lifetime parameter syntax.
+ *
+ *  lifetime = ["2^"] 1*(DIGIT)
+ *
+ * Inputs:
+ *   buf - pointer to start of lifetime string. Assumes string is
+ *         NULL terminated.
+ * Outputs:
+ *   Returns TRUE if syntax is correct. Returns FALSE otherwise.
+ */
+
+tinybool
+verify_sdescriptions_lifetime (char *buf)
+{
+
+    char     *ptr;
+    tinybool tokenFound = FALSE;
+
+    ptr = buf;
+    if (!ptr || *ptr == 0) {
+        return FALSE;
+    }
+
+    while (*ptr) {
+        if (*ptr == '^') {
+            if (tokenFound) {
+                /* make sure we don't have multiple ^ */
+                return FALSE;
+            } else {
+                tokenFound = TRUE;
+                /* Lifetime is in power of 2 format, make sure first and second
+                 * chars are 2^
+                 */
+
+                if (buf[0] != '2' || buf[1] != '^') {
+                    return FALSE;
+                }
+            }
+        } else if (!sdp_is_ascii_digit(*ptr)) {
+                   return FALSE;
+        }
+
+        ptr++;
+
+    }
+
+    /* Make sure if the format is 2^ that there is a number after the ^. */
+    if (tokenFound) {
+        if (strlen(buf) <= 2) {
+            return FALSE;
+        }
+    }
+
+    return TRUE;
+}
+
+
+/*
+ * sdp_validate_maxprate
+ *
+ * This function validates that the string passed in is of the form:
+ * packet-rate = 1*DIGIT ["." 1*DIGIT]
+ */
+tinybool
+sdp_validate_maxprate(const char *string_parm)
+{
+    tinybool retval = FALSE;
+
+    if (string_parm && (*string_parm)) {
+        while (sdp_is_ascii_digit(*string_parm)) {
+            string_parm++;
+        }
+
+        if (*string_parm == '.') {
+            string_parm++;
+            while (sdp_is_ascii_digit(*string_parm)) {
+                string_parm++;
+            }
+        }
+
+        if (*string_parm == '\0') {
+            retval = TRUE;
+        } else {
+            retval = FALSE;
+        }
+    }
+
+    return retval;
+}
+
+char *sdp_findchar (const char *ptr, char *char_list)
+{
+    int i;
+
+    for (;*ptr != '\0'; ptr++) {
+        for (i=0; char_list[i] != '\0'; i++) {
+            if (*ptr == char_list[i]) {
+                return ((char *)ptr);
+            }
+        }
+    }
+    return ((char *)ptr);
+}
+
+/* Locate the next token in a line.  The delim characters are passed in
+ * as a param.  The token also will not go past a new line char or the
+ * end of the string.  Skip any delimiters before the token.
+ */
+const char *sdp_getnextstrtok (const char *str, char *tokenstr, unsigned tokenstr_len,
+                         const char *delim, sdp_result_e *result)
+{
+  const char *token_list = str;
+
+  if (!str || !tokenstr || !delim || !result) {
+    if (result) {
+      *result = SDP_FAILURE;
+    }
+    return str;
+  }
+
+  *result = next_token(&token_list, tokenstr, tokenstr_len, delim);
+
+  return token_list;
+}
+
+
+
+/* Locate the next null ("-") or numeric token in a string.  The delim
+ * characters are passed in as a param.  The token also will not go past
+ * a new line char or the end of the string.  Skip any delimiters before
+ * the token.
+ */
+uint32_t sdp_getnextnumtok_or_null (const char *str, const char **str_end,
+                               const char *delim, tinybool *null_ind,
+                               sdp_result_e *result)
+{
+  const char *token_list = str;
+  char temp_token[SDP_MAX_STRING_LEN];
+  char *strtoul_end;
+  unsigned long numval;
+
+  if (null_ind) {
+    *null_ind = FALSE;
+  }
+
+  if (!str || !str_end || !delim || !null_ind || !result) {
+    if (result) {
+      *result = SDP_FAILURE;
+    }
+    return 0;
+  }
+
+  *result = next_token(&token_list, temp_token, sizeof(temp_token), delim);
+
+  if (*result != SDP_SUCCESS) {
+    return 0;
+  }
+
+  /* First see if its the null char ("-") */
+  if (temp_token[0] == '-') {
+      *null_ind = TRUE;
+      *result = SDP_SUCCESS;
+      *str_end = str;
+      return 0;
+  }
+
+  errno = 0;
+  numval = strtoul(temp_token, &strtoul_end, 10);
+
+  if (errno || strtoul_end == temp_token || numval > UINT_MAX) {
+    *result = SDP_FAILURE;
+    return 0;
+  }
+
+  *result = SDP_SUCCESS;
+  *str_end = token_list;
+  return (uint32_t) numval;
+}
+
+
+/* Locate the next numeric token in a string.  The delim characters are
+ * passed in as a param.  The token also will not go past a new line char
+ * or the end of the string.  Skip any delimiters before the token.
+ */
+uint32_t sdp_getnextnumtok (const char *str, const char **str_end,
+                       const char *delim, sdp_result_e *result)
+{
+  const char *token_list = str;
+  char temp_token[SDP_MAX_STRING_LEN];
+  char *strtoul_end;
+  unsigned long numval;
+
+  if (!str || !str_end || !delim || !result) {
+    if (result) {
+      *result = SDP_FAILURE;
+    }
+    return 0;
+  }
+
+  *result = next_token(&token_list, temp_token, sizeof(temp_token), delim);
+
+  if (*result != SDP_SUCCESS) {
+    return 0;
+  }
+
+  errno = 0;
+  numval = strtoul(temp_token, &strtoul_end, 10);
+
+  if (errno || strtoul_end == temp_token || numval > UINT_MAX) {
+    *result = SDP_FAILURE;
+    return 0;
+  }
+
+  *result = SDP_SUCCESS;
+  *str_end = token_list;
+  return (uint32_t) numval;
+}
+
+
+/*
+ * SDP Crypto Utility Functions.
+ *
+ * First a few common definitions.
+ */
+
+/*
+ * Constants
+ *
+ * crypto_string = The string used to identify the start of sensative
+ *	crypto data.
+ *
+ * inline_string = The string used to identify the start of key/salt
+ *	crypto data.
+ *
+ * star_string = The string used to overwrite sensative data.
+ *
+ * '*_strlen' = The length of '*_string' in bytes (not including '\0')
+ */
+static const char crypto_string[] = "X-crypto:";
+static const int crypto_strlen = sizeof(crypto_string) - 1;
+static const char inline_string[] = "inline:";
+static const int inline_strlen = sizeof(inline_string) - 1;
+/* 40 characters is the current maximum for a Base64 encoded key/salt */
+static const char star_string[] = "****************************************";
+static const int star_strlen = sizeof(star_string) - 1;
+
+/*
+ * MIN_CRYPTO_STRING_SIZE_BYTES = This value defines the minimum
+ *	size of a string that could contain a key/salt. This value
+ *	is used to skip out of parsing when there is no reasonable
+ *	assumption that sensative data will be found. The general
+ *	format of a SRTP Key Salt in SDP looks like:
+ *
+ * X-crypto:<crypto_suite_name> inline:<master_key_salt>||
+ *
+ *	if <crypto_suite_name> and <master_key_salt> is at least
+ *	one character and one space is used before the "inline:",
+ *	then this translates to a size of (aligned by collumn from
+ *	the format shown above):
+ *
+ * 9+       1+                 1+7+    1+                2 = 21
+ *
+ */
+#define MIN_CRYPTO_STRING_SIZE_BYTES 21
+
+/*
+ * Utility macros
+ *
+ * CHAR_IS_WHITESPACE = macro to determine if the passed _test_char
+ *	is whitespace.
+ *
+ * SKIP_WHITESPACE = Macro to advance _cptr to the next non-whitespace
+ *	character. _cptr will not be advanced past _max_cptr.
+ *
+ * FIND_WHITESPACE = Macro to advance _cptr until whitespace is found.
+ *	_cptr will not be advanced past _max_cptr.
+ */
+#define CHAR_IS_WHITESPACE(_test_char) \
+    ((((_test_char)==' ')||((_test_char)=='\t'))?1:0)
+
+#define SKIP_WHITESPACE(_cptr, _max_cptr)           \
+    while ((_cptr)<=(_max_cptr)) {                  \
+        if (!CHAR_IS_WHITESPACE(*(_cptr))) break;   \
+        (_cptr)++;                                  \
+    }
+
+#define FIND_WHITESPACE(_cptr, _max_cptr)           \
+    while ((_cptr)<=(_max_cptr)) {                  \
+        if (CHAR_IS_WHITESPACE(*(_cptr))) break;    \
+        (_cptr)++;                                  \
+    }
+
+/* Function:    sdp_crypto_debug
+ * Description: Check the passed buffer for sensitive data that should
+ *		not be output (such as SRTP Master Key/Salt) and output
+ *		the buffer as debug. Sensitive data will be replaced
+ *		with the '*' character(s). This function may be used
+ *		to display very large buffers so this function ensures
+ *		that buginf is not overloaded.
+ * Parameters:  buffer		pointer to the message buffer to filter.
+ *              length_bytes	size of message buffer in bytes.
+ * Returns:     Nothing.
+ */
+void sdp_crypto_debug (char *buffer, ulong length_bytes)
+{
+    char *current, *start;
+    char *last = buffer + length_bytes;
+    int result;
+
+    /*
+     * For SRTP Master Key/Salt has the form:
+     * X-crypto:<crypto_suite_name> inline:<master_key_salt>||
+     * Where <master_key_salt> is the data to elide (filter).
+     */
+    for (start=current=buffer;
+         current<=last-MIN_CRYPTO_STRING_SIZE_BYTES;
+         current++) {
+        if ((*current == 'x') || (*current == 'X')) {
+            result = cpr_strncasecmp(current, crypto_string, crypto_strlen);
+            if (!result) {
+                current += crypto_strlen;
+                if (current > last) break;
+
+                /* Skip over crypto suite name */
+                FIND_WHITESPACE(current, last);
+
+                /* Skip over whitespace */
+                SKIP_WHITESPACE(current, last);
+
+                /* identify inline keyword */
+                result = cpr_strncasecmp(current, inline_string, inline_strlen);
+                if (!result) {
+                    int star_count = 0;
+
+                    current += inline_strlen;
+                    if (current > last) break;
+
+                    sdp_dump_buffer(start, current - start);
+
+                    /* Hide sensitive key/salt data */
+                    while (current<=last) {
+                        if (*current == '|' || *current == '\n') {
+                            /* Done, print the stars */
+                            while (star_count > star_strlen) {
+                                /*
+                                 * This code is only for the case where
+                                 * too much base64 data was supplied
+                                 */
+                                sdp_dump_buffer((char*)star_string, star_strlen);
+                                star_count -= star_strlen;
+                            }
+                            sdp_dump_buffer((char*)star_string, star_count);
+                            break;
+                        } else {
+                            star_count++;
+                            current++;
+                        }
+                    }
+                    /* Update start pointer */
+                    start=current;
+                }
+            }
+        }
+    }
+
+    if (last > start) {
+        /* Display remainder of buffer */
+        sdp_dump_buffer(start, last - start);
+    }
+}
+
+/*
+ * sdp_debug_msg_filter
+ *
+ * DESCRIPTION
+ *     Check the passed message buffer for sensitive data that should
+ *     not be output (such as SRTP Master Key/Salt). Sensitive data
+ *     will be replaced with the '*' character(s).
+ *
+ * PARAMETERS
+ *     buffer: pointer to the message buffer to filter.
+ *
+ *     length_bytes: size of message buffer in bytes.
+ *
+ * RETURN VALUE
+ *     The buffer modified.
+ */
+char * sdp_debug_msg_filter (char *buffer, ulong length_bytes)
+{
+    char *current;
+    char *last = buffer + length_bytes;
+    int result;
+
+    SDP_PRINT("\n%s:%d: Eliding sensitive data from debug output",
+            __FILE__, __LINE__);
+    /*
+     * For SRTP Master Key/Salt has the form:
+     * X-crypto:<crypto_suite_name> inline:<master_key_salt>||
+     * Where <master_key_salt> is the data to elide (filter).
+     */
+    for (current=buffer;
+         current<=last-MIN_CRYPTO_STRING_SIZE_BYTES;
+         current++) {
+        if ((*current == 'x') || (*current == 'X')) {
+            result = cpr_strncasecmp(current, crypto_string, crypto_strlen);
+            if (!result) {
+                current += crypto_strlen;
+                if (current > last) break;
+
+                /* Skip over crypto suite name */
+                FIND_WHITESPACE(current, last);
+
+                /* Skip over whitespace */
+                SKIP_WHITESPACE(current, last);
+
+                /* identify inline keyword */
+                result = cpr_strncasecmp(current, inline_string, inline_strlen);
+                if (!result) {
+                    current += inline_strlen;
+                    if (current > last) break;
+
+                    /* Hide sensitive key/salt data */
+                    while (current<=last) {
+                        if (*current == '|' || *current == '\n') {
+                            /* Done */
+                            break;
+                        } else {
+                            *current = '*';
+                            current++;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    return buffer;
+}
+
+
+/* Function:    sdp_checkrange
+ * Description: This checks the range of a ulong value to make sure its
+ *              within the range of 0 and 4Gig. stroul cannot be used since
+ *              for values greater greater than 4G, stroul will either wrap
+ *              around or return ULONG_MAX.
+ * Parameters:  sdp_p       Pointer to the sdp structure
+ *              num         The number to check the range for
+ *              u_val       This variable get populated with the ulong value
+ *                          if the number is within the range.
+ * Returns:     tinybool - returns TRUE if the number passed is within the
+ *                         range, FALSE otherwise
+ */
+tinybool sdp_checkrange (sdp_t *sdp_p, char *num, ulong *u_val)
+{
+    ulong l_val;
+    char *endP = NULL;
+    *u_val = 0;
+
+    if (!num || !*num) {
+        return FALSE;
+    }
+
+    if (*num == '-') {
+        if (sdp_p->debug_flag[SDP_DEBUG_ERRORS]) {
+            SDPLogError(logTag, "%s ERROR: Parameter value is a negative number: %s",
+                      sdp_p->debug_str, num);
+        }
+        return FALSE;
+    }
+
+    l_val = strtoul(num, &endP, 10);
+    if (*endP == '\0') {
+
+        if (l_val > 4294967295UL) {
+            if (sdp_p->debug_flag[SDP_DEBUG_ERRORS]) {
+                SDPLogError(logTag, "%s ERROR: Parameter value: %s is greater than 4294967295",
+                          sdp_p->debug_str, num);
+            }
+            return FALSE;
+        }
+
+        if (l_val == 4294967295UL) {
+            /*
+             * On certain platforms where ULONG_MAX is equivalent to
+             * 4294967295, strtoul will return ULONG_MAX even if the the
+             * value of the string is greater than 4294967295. To detect
+             * that scenario we make an explicit check here.
+             */
+            if (strcmp("4294967295", num)) {
+                if (sdp_p->debug_flag[SDP_DEBUG_ERRORS]) {
+                    SDPLogError(logTag, "%s ERROR: Parameter value: %s is greater than 4294967295",
+                              sdp_p->debug_str, num);
+                }
+                return FALSE;
+            }
+        }
+    }
+    *u_val = l_val;
+    return TRUE;
+}
+
+#undef CHAR_IS_WHITESPACE
+#undef SKIP_WHITESPACE
+#undef FIND_WHITESPACE