masterthesis-ecdaa-network-wrapper/issuer.c

#include "issuer.h"

typedef enum issuer_state {
    ON,
    JOINSTART,
    JOINPROCEED,
    READY
} issuerstate_e;

typedef struct issuer {
    struct ecdaa_issuer_public_key_FP256BN ipk;
    struct ecdaa_issuer_secret_key_FP256BN isk;
    issuerstate_e state;
} issuer_t;

issuer_t issuer;


int main() {
    int err = 0;

    if (2 != server_start(&process_issuer, ISSUERPORT)) {
        printf("server failed\n");
    }
    return 0;
}

int process_issuer(char *buffer) {
    ssize_t len = 0;
    int ret = 0;

    printf("> ISSUER: %s\n", buffer);

    if (0 == strncasecmp("OK", buffer, 2)) {
        switch (issuer.state) {
            case JOINPROCEED:
                issuer.state = READY;
                break;
            default:
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "ERR\n", 4);
                break;
        }
    } else if (0 == strncasecmp("ERR", buffer, 3)) {
        switch (issuer.state) {
            case JOINPROCEED:
                printf("command failed at client\n");
                issuer.state = READY;
                break;
            default:
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "ERR\n", 4);
                break;
        }
    } else if (0 == strncasecmp("SETUP", buffer, 5)) {
        switch (issuer.state) {
            case ON:
                printf("setup()\n");
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "SETUPDONE\n", 10);
                issuer.state = READY;
                break;
            default:
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "ERR\n", 4);
                break;
        }
    } else if (0 == strncasecmp("JOIN", buffer, 4)) {
        switch (issuer.state) {
            case READY:
                printf("join()\n");
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "JOINSTART\n", 10);
                issuer.state = JOINSTART;
                break;
            default:
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "ERR\n", 4);
                break;
        }
    } else if (0 == strncasecmp("APPEND", buffer, 6)) {
        switch (issuer.state) {
            case JOINSTART:
                printf("append()\n");
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "JOINPROCEED\n", 12);
                issuer.state = READY;
                break;
            default:
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "ERR\n", 4);
                break;
        }
    } else if (0 == strncasecmp("PUBLISH", buffer, 7)) {
        switch (issuer.state) {
            case READY:
                printf("publish()\n");
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "PUBLISH\n", 8);
                issuer.state = READY;
                break;
            default:
                bzero(buffer, MAX_BUFSIZE);
                strncpy(buffer, "ERR\n", 4);
                break;
        }
    } else if (0 == strncasecmp("EXIT", buffer, 4)) {
        printf("exit()\n");
        bzero(buffer, MAX_BUFSIZE);
        strncpy(buffer, "OK\n", 3);
        ret = 1;
    } else if (0 == strncasecmp("SHUTDOWN", buffer, 8)) {
        bzero(buffer, MAX_BUFSIZE);
        strncpy(buffer, "OK\n", 3);
        ret = 2;
    } else {
        printf("error()\n");
        bzero(buffer, MAX_BUFSIZE);
        strncpy(buffer, "ERR\n", 4);
        ret = 0;
    }

    printf("< ISSUER: %s", buffer);
    return ret;
}