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annotate libsip/primary_parse.c @ 235:bd493b21f215

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libnumdb2: port check_nanp.c
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 14 Aug 2023 13:57:10 -0800
parents f1cf80c7e243
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
40
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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 {
44
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45 if (strncasecmp(msg->pkt_buffer, "SIP/2.0 ", 8))
40
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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
40
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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;
40
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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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120 for (hdr_cnt = 0; ; ) {
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121 rc = find_crlf(cp, msg_end, &endp, &nextp);
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122 if (!rc)
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123 return(-1);
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124 if (endp == cp) /* final CRLF? */
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125 break;
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126 if (!isalpha(*cp))
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127 return(-1);
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128 if (hdr_cnt >= MAX_HEADER_FIELDS)
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129 return(-2);
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130 msg->hdr_fields[hdr_cnt].field_name = cp;
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131 while (cp < endp && (isalnum(*cp) || *cp == '-'))
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132 cp++;
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133 if (cp >= endp)
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134 return(-1);
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135 if (*cp == ':')
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136 *cp++ = '\0';
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137 else if (isspace(*cp)) {
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138 *cp++ = '\0';
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139 while (cp < endp && isspace(*cp))
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140 cp++;
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141 if (cp >= endp)
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142 return(-1);
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143 if (*cp++ != ':')
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 return(-1);
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 } else
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 return(-1);
45
f1cf80c7e243 libsip/primary_parse.c: fully trim leading and trailing spaces
Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
147 sp = cp;
40
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 cp = nextp;
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 while (cp < msg_end && (*cp == ' ' || *cp == '\t')) {
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 rc = find_crlf(cp, msg_end, &endp, &nextp);
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 if (!rc)
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 return(-1);
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 cp = nextp;
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 }
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 *endp = '\0';
45
f1cf80c7e243 libsip/primary_parse.c: fully trim leading and trailing spaces
Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
156 while (isspace(*sp))
f1cf80c7e243 libsip/primary_parse.c: fully trim leading and trailing spaces
Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
157 sp++;
f1cf80c7e243 libsip/primary_parse.c: fully trim leading and trailing spaces
Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
158 trim_trailing_spaces(sp);
f1cf80c7e243 libsip/primary_parse.c: fully trim leading and trailing spaces
Mychaela Falconia <falcon@freecalypso.org>
parents: 44
diff changeset
159 msg->hdr_fields[hdr_cnt++].field_value = sp;
40
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 }
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 msg->num_hdr_fields = hdr_cnt;
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 msg->msg_body = nextp;
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 msg->msg_body_len = msg_end - nextp;
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 return(0);
77d980126efd libsip started with primary parsing function
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 }