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libpsyc/test/testServer.c

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/**
* libpsyc test server for packet parsing & rendering
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*
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* based on selectserver.c from http://beej.us/guide/bgnet/
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* "The C source code presented in this document is hereby granted to the public domain, and is completely free of any license restriction."
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*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <math.h>
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#include <assert.h>
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#include <psyc.h>
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#include <psyc/parser.h>
#include <psyc/render.h>
#include <psyc/syntax.h>
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const size_t RECV_BUF_SIZE = 256;
const size_t CONT_BUF_SIZE = 512;
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const size_t SEND_BUF_SIZE = 1024;
const size_t NUM_PARSERS = 100;
// max size for routing & entity header
const size_t ROUTING_LINES = 16;
const size_t ENTITY_LINES = 32;
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// get sockaddr, IPv4 or IPv6:
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
int main(int argc, char **argv)
{
char *port = argc > 1 ? argv[1] : "4440";
uint8_t routing_only = argc > 2, verbose = argc > 3;
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fd_set master; // master file descriptor list
fd_set read_fds; // temp file descriptor list for select()
int fdmax; // maximum file descriptor number
int listener; // listening socket descriptor
int newfd; // newly accept()ed socket descriptor
struct sockaddr_storage remoteaddr; // client address
socklen_t addrlen;
char buf[CONT_BUF_SIZE + RECV_BUF_SIZE]; // cont buf + recv buf: [ ccrrrr]
char *recvbuf = buf + CONT_BUF_SIZE; // recv buf: ^^^^
char *parsebuf; // parse buf: ^^^^^^
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char sendbuf[SEND_BUF_SIZE];
size_t nbytes, contbytes = 0;
char remoteIP[INET6_ADDRSTRLEN];
int yes = 1; // for setsockopt() SO_REUSEADDR, below
int i, rv;
struct addrinfo hints, *ai, *p;
psycParseState parsers[NUM_PARSERS];
psycPacket packets[NUM_PARSERS];
psycModifier routing[NUM_PARSERS][ROUTING_LINES];
psycModifier entity[NUM_PARSERS][ENTITY_LINES];
psycModifier *mod;
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int ret, retl;
char oper;
psycString name, value, elem;
psycString *pname, *pvalue;
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psycParseListState listState;
FD_ZERO(&master); // clear the master and temp sets
FD_ZERO(&read_fds);
// get us a socket and bind it
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if ((rv = getaddrinfo(NULL, port, &hints, &ai)) != 0) {
fprintf(stderr, "error: %s\n", gai_strerror(rv));
exit(1);
}
for (p = ai; p != NULL; p = p->ai_next) {
listener = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if (listener < 0) {
continue;
}
// lose the pesky "address already in use" error message
setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
if (bind(listener, p->ai_addr, p->ai_addrlen) < 0) {
close(listener);
continue;
}
break;
}
// if we got here, it means we didn't get bound
if (p == NULL) {
fprintf(stderr, "failed to bind\n");
exit(2);
}
freeaddrinfo(ai); // all done with this
// listen
if (listen(listener, 10) == -1) {
perror("listen");
exit(3);
}
// add the listener to the master set
FD_SET(listener, &master);
// keep track of the biggest file descriptor
fdmax = listener; // so far, it's this one
// main loop
for (;;) {
read_fds = master; // copy it
if (select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1) {
perror("select");
exit(4);
}
// run through the existing connections looking for data to read
for (i = 0; i <= fdmax; i++) {
if (FD_ISSET(i, &read_fds)) { // we got one!!
if (i == listener) {
// handle new connections
if (fdmax == NUM_PARSERS - 1)
continue; // ignore if there's too many
addrlen = sizeof remoteaddr;
newfd = accept(listener, (struct sockaddr *)&remoteaddr, &addrlen);
if (newfd == -1) {
perror("accept");
} else {
FD_SET(newfd, &master); // add to master set
if (newfd > fdmax) { // keep track of the max
fdmax = newfd;
}
// reset parser state & packet
if (routing_only)
psyc_initParseState2(&parsers[newfd], PSYC_PARSE_ROUTING_ONLY);
else
psyc_initParseState(&parsers[newfd]);
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memset(&packets[newfd], 0, sizeof(psycPacket));
memset(&routing[newfd], 0, sizeof(psycModifier) * ROUTING_LINES);
memset(&entity[newfd], 0, sizeof(psycModifier) * ENTITY_LINES);
packets[newfd].routing.modifiers = routing[newfd];
packets[newfd].entity.modifiers = entity[newfd];
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printf("# New connection from %s on socket %d\n",
inet_ntop(remoteaddr.ss_family,
get_in_addr((struct sockaddr*)&remoteaddr),
remoteIP, INET6_ADDRSTRLEN),
newfd);
}
} else {
// handle data from a client
if ((nbytes = recv(i, recvbuf, RECV_BUF_SIZE, 0)) <= 0) {
// got error or connection closed by client
if (nbytes == 0) {
// connection closed
printf("socket %d hung up\n", i);
} else {
perror("recv");
}
close(i); // bye!
FD_CLR(i, &master); // remove from master set
} else {
// we got some data from a client
parsebuf = recvbuf - contbytes;
psyc_nextParseBuffer(&parsers[i], psyc_newString(parsebuf, contbytes + nbytes));
contbytes = 0;
oper = 0;
name.length = 0;
value.length = 0;
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do {
ret = psyc_parse(&parsers[i], &oper, &name, &value);
if (verbose)
printf("# ret = %d\n", ret);
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switch (ret) {
case PSYC_PARSE_ROUTING:
assert(packets[i].routing.lines < ROUTING_LINES);
mod = &(packets[i].routing.modifiers[packets[i].routing.lines]);
pname = &mod->name;
pvalue = &mod->value;
mod->flag = PSYC_MODIFIER_ROUTING;
packets[i].routing.lines++;
break;
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case PSYC_PARSE_ENTITY_INCOMPLETE:
case PSYC_PARSE_ENTITY:
assert(packets[i].entity.lines < ENTITY_LINES);
mod = &(packets[i].entity.modifiers[packets[i].entity.lines]);
pname = &mod->name;
pvalue = &mod->value;
if (ret == PSYC_PARSE_ENTITY) {
packets[i].entity.lines++;
mod->flag = parsers[i].valueLength ? PSYC_MODIFIER_NEED_LENGTH : PSYC_MODIFIER_NO_LENGTH;
}
break;
case PSYC_PARSE_BODY_INCOMPLETE:
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case PSYC_PARSE_BODY:
pname = &(packets[i].method);
pvalue = &(packets[i].data);
break;
case PSYC_PARSE_COMPLETE:
printf("# Done parsing.\n");
packets[i].flag = parsers[i].contentLengthFound ? PSYC_PACKET_NEED_LENGTH : PSYC_PACKET_NO_LENGTH;
psyc_setPacketLength(&packets[i]);
psyc_render(&packets[i], sendbuf, SEND_BUF_SIZE);
if (send(i, sendbuf, packets[i].length, 0) == -1) {
perror("send");
}
ret = -1;
break;
case PSYC_PARSE_INSUFFICIENT:
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if (verbose)
printf("# Insufficient data.\n");
contbytes = parsers[i].buffer.length - parsers[i].cursor;
if (contbytes > 0) { // copy end of parsebuf before start of recvbuf
assert(recvbuf - contbytes >= buf); // make sure it's still in the buffer
memcpy(recvbuf - contbytes, parsebuf + parsers[i].cursor, contbytes);
}
ret = 0;
break;
default:
printf("# Error while parsing: %i\n", ret);
ret = -1;
}
switch (ret) {
case PSYC_PARSE_ENTITY_INCOMPLETE:
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case PSYC_PARSE_BODY_INCOMPLETE:
ret = 0;
case PSYC_PARSE_ENTITY:
case PSYC_PARSE_ROUTING:
case PSYC_PARSE_BODY:
if (oper) {
mod->oper = oper;
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if (verbose)
printf("%c", oper);
}
if (name.length) {
pname->ptr = malloc(name.length);
pname->length = name.length;
assert(pname->ptr != NULL);
memcpy((void*)pname->ptr, name.ptr, name.length);
name.length = 0;
if (verbose) {
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printf("%.*s = ", (int)pname->length, pname->ptr);
}
}
if (value.length) {
if (!pvalue->ptr)
pvalue->ptr = malloc(parsers[i].valueLength ? parsers[i].valueLength : value.length);
assert(pvalue->ptr != NULL);
memcpy((void*)pvalue->ptr + pvalue->length, value.ptr, value.length);
pvalue->length += value.length;
value.length = 0;
if (verbose) {
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printf("%.*s", (int)pvalue->length, pvalue->ptr);
if (parsers[i].valueLength > pvalue->length)
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printf("...");
printf("\n");
}
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} else if (verbose) {
printf("\n");
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}
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if (verbose)
printf("\t\t\t\t\t\t\t\t# n:%ld v:%ld c:%ld r:%ld\n", pname->length, pvalue->length, parsers[i].contentParsed, parsers[i].routingLength);
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}
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switch (ret) {
case PSYC_PARSE_ROUTING:
case PSYC_PARSE_ENTITY:
if (pname->length >= 5 && memcmp(pname->ptr, "_list", 5) == 0) {
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if (verbose)
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printf("## LIST START\n");
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psyc_initParseListState(&listState);
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psyc_nextParseListBuffer(&listState, *pvalue);
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do {
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retl = psyc_parseList(&listState, pname, pvalue, &elem);
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switch (retl) {
case PSYC_PARSE_LIST_END:
retl = 0;
case PSYC_PARSE_LIST_ELEM:
if (verbose) {
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printf("|%.*s\n", (int)elem.length, elem.ptr);
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if (ret == PSYC_PARSE_LIST_END)
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printf("## LIST END");
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}
break;
default:
printf("# Error while parsing list: %i\n", ret);
ret = retl = -1;
}
} while (retl > 0);
}
}
} while (ret > 0);
if (ret < 0) {
printf("# Closing connection: %i\n", i);
close(i); // bye!
FD_CLR(i, &master); // remove from master set
}
}
} // END handle data from client
} // END got new incoming connection
} // END looping through file descriptors
} // END for(;;)--and you thought it would never end!
return 0;
}