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1
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#include <stdio.h>
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2
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#include <stdint.h>
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3
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#include <arpa/inet.h>
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4
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5
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struct ipcp_hdr {
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6
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uint8_t code;
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uint8_t id;
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8
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uint16_t len;
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9
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uint8_t options[0];
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10
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} __attribute__ ((packed));
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11
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12
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enum ipcp_options {
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IPCP_OPT_IPADDR = 3,
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14
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IPCP_OPT_PRIMARY_DNS = 129,
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IPCP_OPT_SECONDARY_DNS = 131,
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16
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} __attribute__ ((packed));
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17
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18
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struct ipcp_option_hdr {
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uint8_t type;
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20
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uint8_t len;
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21
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uint8_t data[0];
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22
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} __attribute__ ((packed));
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23
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24
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/* determine if IPCP contains given option */
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static struct ipcp_option_hdr *ipcp_contains_option(struct ipcp_hdr *ipcp, enum ipcp_options opt)
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{
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uint8_t *cur = ipcp->options;
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28
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printf("ipcp->code=%x\n", ipcp->code);
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printf("ipcp->id=%x\n", ipcp->id);
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printf("ipcp->len=%x (%u)\n", ipcp->len, ipcp->len);
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32
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/* iterate over Options and check if protocol contained */
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while (cur + 2 <= ((uint8_t *)ipcp) + ipcp->len) {
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struct ipcp_option_hdr *cur_opt = (struct ipcp_option_hdr *) cur;
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36
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printf("\n");
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37
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printf("cur_opt->type=%x\n", cur_opt->type);
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38
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printf("cur_opt->len=%x\n", cur_opt->len);
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39
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if (cur_opt->type == opt)
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return cur_opt;
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cur += cur_opt->len;
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}
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44
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return NULL;
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45
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}
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46
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void main(void)
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48
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{
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49
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struct ipcp_hdr *ipcp;
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50
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uint8_t pco_ipcp[] = {0x80, 0x21, 0x0a, 0x01, 0x0a, 0x00, 0x0a, 0x81, 0x06, 0x00, 0x00, 0x00, 0x00, 0x80, 0x21, 0x0a, 0x01, 0x0b, 0x00, 0x0a};
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52
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ipcp = (struct ipcp_hdr*) (pco_ipcp + 3); /* 2=type + 1=len */
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54
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55
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/* Fix endieness of length field! */
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56
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ipcp->len = ntohs(ipcp->len);
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57
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58
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59
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printf("Hello, ipcp\n");
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ipcp_contains_option(ipcp, IPCP_OPT_PRIMARY_DNS);
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printf("Primary DNS done\n\n\n");
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ipcp_contains_option(ipcp, IPCP_OPT_SECONDARY_DNS);
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printf("Secondary DNS done\n\n\n");
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64
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65
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66
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67
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}
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