FreeCalypso > hg > sipout-test-utils
annotate libsip/primary_parse.c @ 2:26383ed8b79f
test-fsk: starting as a copy of test-voice
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 04 Mar 2024 21:03:19 -0800 |
parents | 35c0d9f03c0a |
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rev | line source |
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1 /* |
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2 * In this module we are going to implement the first stage of |
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3 * parsing for incoming SIP UDP packets, using struct sip_pkt_rx |
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4 * defined in parse.h. |
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5 */ |
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6 |
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7 #include <ctype.h> |
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8 #include <string.h> |
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9 #include <strings.h> |
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10 #include <stdlib.h> |
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11 #include "parse.h" |
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12 |
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13 static |
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14 find_crlf(ptr, msg_end, endp, nextp) |
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15 char *ptr, *msg_end, **endp, **nextp; |
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16 { |
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17 for (;;) { |
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18 if (ptr >= msg_end) |
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19 return(0); |
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20 switch (*ptr) { |
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21 case '\0': |
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22 return(0); |
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23 case '\n': |
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24 *endp = ptr; |
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25 *nextp = ptr + 1; |
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26 return(1); |
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27 case '\r': |
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28 *endp = ptr; |
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29 ptr++; |
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30 if (ptr >= msg_end) |
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31 return(0); |
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32 if (*ptr != '\n') |
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33 return(0); |
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34 *nextp = ptr + 1; |
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35 return(1); |
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36 } |
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37 ptr++; |
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38 } |
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39 } |
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40 |
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41 static |
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42 try_status_line(msg) |
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43 struct sip_pkt_rx *msg; |
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44 { |
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45 if (strncasecmp(msg->pkt_buffer, "SIP/2.0 ", 8)) |
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46 return(0); |
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47 if (!isdigit(msg->pkt_buffer[8])) |
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48 return(0); |
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49 if (!isdigit(msg->pkt_buffer[9])) |
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50 return(0); |
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51 if (!isdigit(msg->pkt_buffer[10])) |
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52 return(0); |
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53 if (msg->pkt_buffer[11] != ' ') |
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54 return(0); |
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55 msg->status_code = atoi(msg->pkt_buffer + 8); |
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56 msg->status_str = msg->pkt_buffer + 8; |
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57 return(1); |
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58 } |
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59 |
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60 static |
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61 try_request_line(msg) |
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62 struct sip_pkt_rx *msg; |
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63 { |
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64 char *cp; |
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65 |
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66 cp = msg->pkt_buffer; |
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67 if (!isupper(*cp)) |
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68 return(0); |
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69 while (isalnum(*cp)) |
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70 cp++; |
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71 if (*cp != ' ') |
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72 return(0); |
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73 msg->req_method = msg->pkt_buffer; |
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74 *cp++ = '\0'; |
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75 msg->req_uri = cp; |
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76 while (*cp && !isspace(*cp)) |
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77 cp++; |
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78 if (*cp != ' ') |
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79 return(0); |
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80 *cp++ = '\0'; |
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81 if (strcasecmp(cp, "SIP/2.0")) |
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82 return(0); |
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83 else |
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84 return(1); |
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85 } |
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86 |
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87 static void |
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88 trim_trailing_spaces(sp) |
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89 char *sp; |
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90 { |
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91 char *ep; |
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92 |
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93 ep = index(sp, '\0'); |
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94 while (ep > sp && isspace(ep[-1])) |
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95 ep--; |
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96 *ep = '\0'; |
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97 } |
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98 |
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99 parse_incoming_sip_msg(msg) |
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100 struct sip_pkt_rx *msg; |
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101 { |
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102 char *msg_end = msg->pkt_buffer + msg->pkt_length; |
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103 char *cp, *endp, *nextp, *sp; |
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104 unsigned hdr_cnt; |
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105 int rc; |
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106 |
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107 /* begin by isolating the Request-Line or Status-Line */ |
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108 rc = find_crlf(msg->pkt_buffer, msg_end, &endp, &nextp); |
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109 if (!rc) |
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110 return(-1); |
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111 *endp = '\0'; |
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112 if (try_status_line(msg)) |
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113 msg->parse_msgtype = SIP_MSG_TYPE_RESP; |
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114 else if (try_request_line(msg)) |
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115 msg->parse_msgtype = SIP_MSG_TYPE_REQ; |
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116 else |
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117 return(-1); |
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118 /* now preparse header fields */ |
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119 cp = nextp; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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120 for (hdr_cnt = 0; ; ) { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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121 rc = find_crlf(cp, msg_end, &endp, &nextp); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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122 if (!rc) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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123 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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124 if (endp == cp) /* final CRLF? */ |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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125 break; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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126 if (!isalpha(*cp)) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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127 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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128 if (hdr_cnt >= MAX_HEADER_FIELDS) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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129 return(-2); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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130 msg->hdr_fields[hdr_cnt].field_name = cp; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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131 while (cp < endp && (isalnum(*cp) || *cp == '-')) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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132 cp++; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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133 if (cp >= endp) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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134 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 if (*cp == ':') |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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136 *cp++ = '\0'; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 else if (isspace(*cp)) { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 *cp++ = '\0'; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 while (cp < endp && isspace(*cp)) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 cp++; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 if (cp >= endp) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 if (*cp++ != ':') |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 } else |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 sp = cp; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 cp = nextp; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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149 while (cp < msg_end && (*cp == ' ' || *cp == '\t')) { |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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150 rc = find_crlf(cp, msg_end, &endp, &nextp); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
151 if (!rc) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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152 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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153 cp = nextp; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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154 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 *endp = '\0'; |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
156 while (isspace(*sp)) |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
157 sp++; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
158 trim_trailing_spaces(sp); |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
159 msg->hdr_fields[hdr_cnt++].field_value = sp; |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
160 } |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
161 msg->num_hdr_fields = hdr_cnt; |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
162 msg->msg_body = nextp; |
35c0d9f03c0a
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
163 msg->msg_body_len = msg_end - nextp; |
35c0d9f03c0a
beginning with sipout-test-voice,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
164 return(0); |
35c0d9f03c0a
beginning with sipout-test-voice,
Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
165 } |