first-free-port : refactoring noms de constantes
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7fa3b4366b
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98c8239009
1 changed files with 12 additions and 13 deletions
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@ -6,12 +6,12 @@
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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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#define TCP_TABLE_PATH "/proc/net/tcp"
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#define TCP_TABLE_LINE_LENGTH 151
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#define LOCALHOST_HEX "0100007F"
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#define WILDCARD_HEX "00000000"
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#define LOCALHOSTIP_HEX "0100007F"
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#define WILDCARDIP_HEX "00000000"
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#define LISTENING_HEX "0A"
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#define PORTS_BLOCKS_TO_ALLOW 4
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#define BLOCKS_TO_ALLOC 4
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/**
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* Print a nice error message
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@ -30,7 +30,7 @@ static unsigned short *get_listening_ports(unsigned short *listening_ports, FILE
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char *address;
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char *state;
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char *field;
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size_t allowed_for_ports = PORTS_BLOCKS_TO_ALLOW;
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size_t blocks_allocated = BLOCKS_TO_ALLOC;
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// Skip first line (header)
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fgets(line, sizeof(line), tcp_table_fptr);
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@ -48,19 +48,18 @@ static unsigned short *get_listening_ports(unsigned short *listening_ports, FILE
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field = strtok(NULL, delimiter);
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}
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if ((!strncmp(address, LOCALHOST_HEX, 8) || !strncmp(address, WILDCARD_HEX, 8)) && !strncmp(state, LISTENING_HEX, 2)) {
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if (len == allowed_for_ports) {
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allowed_for_ports = allowed_for_ports + PORTS_BLOCKS_TO_ALLOW;
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listening_ports = realloc(listening_ports, allowed_for_ports * sizeof(unsigned short));
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if ((!strncmp(address, LOCALHOSTIP_HEX, 8) || !strncmp(address, WILDCARDIP_HEX, 8)) && !strncmp(state, LISTENING_HEX, 2)) {
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if (len == blocks_allocated) {
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blocks_allocated = blocks_allocated + BLOCKS_TO_ALLOC;
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listening_ports = realloc(listening_ports, blocks_allocated * sizeof(short));
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}
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listening_ports[len] = strtol(address + strlen(address) - 4, NULL, 16);
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len++;
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}
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}
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if (len == allowed_for_ports) {
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allowed_for_ports = allowed_for_ports + PORTS_BLOCKS_TO_ALLOW;
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listening_ports = realloc(listening_ports, allowed_for_ports * sizeof(unsigned short));
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if (len == blocks_allocated) {
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listening_ports = realloc(listening_ports, blocks_allocated + 1);
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}
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listening_ports[len] = 0;
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@ -94,7 +93,7 @@ int main(int argc, char *argv[]) {
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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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FILE *tcp_table_fptr = fopen(TCP_TABLE_PATH, "r");
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if (tcp_table_fptr == NULL) {
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print_error(argv[0], "error opening the TCP table.");
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return errno;
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