first-free-port : meilleure gestion des erreurs
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c16666a3f9
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1 changed files with 17 additions and 4 deletions
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@ -3,6 +3,7 @@
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#include <fcntl.h>
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#include <sysexits.h>
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#include <string.h>
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#include <errno.h>
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#define MIN_TCP_PORT 1
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#define TCP_TABLE "/proc/net/tcp"
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@ -12,6 +13,13 @@
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#define LISTENING_HEX "0A"
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#define PORTS_BLOCKS_TO_ALLOW 4
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/**
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* Print a nice error message
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*/
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static void print_error(char *name, const char *message) {
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fprintf(stderr, "%s: %s\n", name, message);
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}
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/**
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* Get all the listening TCP ports
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*/
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@ -81,20 +89,25 @@ int main(int argc, char *argv[]) {
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}
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if (!is_valid_tcp_port(current_port)) {
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fprintf(stderr, "%s: provide a valid TCP port number as first argument.\n", argv[0]);
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print_error(argv[0], "provide a valid TCP port number as first argument.");
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return EX_USAGE;
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}
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// Open TCP table
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FILE *tcp_table_fptr = fopen(TCP_TABLE, "r");
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if (tcp_table_fptr == NULL) {
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fprintf(stderr, "%s: error opening the TCP table.\n", argv[0]);
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return EX_OSFILE;
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print_error(argv[0], "error opening the TCP table.");
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return errno;
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}
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unsigned short *listening_ports = malloc(PORTS_BLOCKS_TO_ALLOW * sizeof(unsigned short));
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listening_ports = get_listening_ports(listening_ports, tcp_table_fptr);
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if (fclose(tcp_table_fptr) != 0) {
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print_error(argv[0], "can't close the TCP table.");
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return errno;
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}
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// Check if the current port is available, add
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while (!is_port_available(current_port, listening_ports)) {
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current_port++;
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@ -106,7 +119,7 @@ int main(int argc, char *argv[]) {
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printf("%d\n", current_port);
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return EXIT_SUCCESS;
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} else {
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fprintf(stderr, "%s: no more ports available; how did you fuck up that bad ???\n", argv[0]);
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print_error(argv[0], "no more ports available; how did you fuck up that bad ???");
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return EX_TEMPFAIL;
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}
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}
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