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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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How to Apply These Terms to Your New Programs
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SRC = $(wildcard src/*.c)
OBJ = $(subst .c,.o,$(subst src,work,$(SRC)))
LIBS =
CFLAGS := -pipe -Wall -Wpedantic -Werror
CFLAGS += -Isrc/include -pthread -ggdb
INSTALLDIR := /usr/bin
OUT = swebs
build/$(OUT): $(OBJ)
$(CC) $(OBJ) -o build/$(OUT) $(LIBS)
work/%.o: src/%.c $(wildcard src/include/*.h)
$(CC) $(CFLAGS) $< -c -o $@
install: build/$(OUT)
cp build/$(OUT) $(INSTALLDIR)/$(OUT)
uninstall: $(INSTALLDIR)/$(OUT)
rm $(INSTALLDIR)/$(OUT)

0
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23
documentation/sitefiles.md Normal file
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# Part 1: Introduction
Every single website hosted with swebs has a sitefile associated with it.
sitefiles specify the layout of the hosted site. It basically tells swebs what to do to get the response.
sitefiles consist of commands, which are of the form
```[action] [arguments]```
sitefiles also allow comments with #
# Part 2: Commands
* ```set [variable] [value]``` - sets some variable for the following pages
* ```read [http path] [file path]``` - if the requested path matches ```[http path]```, return the contents of ```[file path]```
##### Other than set, commands should take in a regex as argument 1 and operate on a file specified in argument 2.
# Part 3: Variables
* ```type```: - The type of http request to respond to. One of:
* get
* post

244
src/connections.c Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <runner.h>
#include <sitefile.h>
#include <responses.h>
#include <connections.h>
int newConnection(Connection *ret, int fd) {
ret->fd = fd;
if (fcntl(ret->fd, F_SETFL, O_NONBLOCK))
return 1;
ret->progress = RECEIVE_REQUEST;
ret->currLineAlloc = 30;
ret->currLineLen = 0;
ret->currLine = malloc(ret->currLineAlloc);
if (ret->currLine == NULL)
return 1;
ret->allocatedFields = 10;
ret->fields = malloc(sizeof(char *[2]) * ret->allocatedFields);
if (ret->fields == NULL)
return 1;
ret->path = NULL;
ret->body = NULL;
//pointers to things that are allocated within functions should be
//initialized to NULL so that free() doens't fail.
ret->next = NULL;
return 0;
}
void resetConnection(Connection *conn) {
conn->type = RECEIVE_REQUEST;
conn->fieldCount = 0;
free(conn->body);
free(conn->path);
conn->body = NULL;
conn->path = NULL;
}
void freeConnection(Connection *conn) {
shutdown(conn->fd, SHUT_RDWR);
free(conn->currLine);
free(conn->path);
free(conn->fields);
free(conn->body);
free(conn);
}
static int processRequest(Connection *conn) {
char *line = conn->currLine;
for (int i = 0;; i++) {
if (line[i] == ' ') {
line[i] = '\0';
if (i >= 8)
return 1;
uint64_t type = 0;
for (int j = 0; j < i; j++) {
type <<= 8;
type |= line[j];
}
switch (type) {
case 0x474554l:
conn->type = GET;
break;
case 0x504f5354l:
conn->type = POST;
break;
case 0x505554l:
conn->type = PUT;
break;
case 0x48454144l:
conn->type = HEAD;
break;
case 0x44454c455445l:
conn->type = DELETE;
break;
case 0x5041544348l:
conn->type = PATCH;
break;
case 0x4f5054494f4e53l:
conn->type = OPTIONS;
break;
default:
return 1;
}
//This would actually be far nicer in HolyC of all
//languages. I feel like the context immediately
//following each magic number is enough.
line += i + 1;
break;
}
if (line[i] == '\0') {
return 1;
}
}
for (int i = 0;; i++) {
if (line[i] == ' ') {
line[i] = '\0';
conn->path = malloc(i + 1);
if (conn->path == NULL)
return 1;
memcpy(conn->path, line, i + 1);
line += i + 1;
break;
}
if (line[i] == '\0') {
return 1;
}
}
if (strcmp(line, "HTTP/1.1"))
return 1;
conn->progress = RECEIVE_HEADER;
conn->fieldCount = 0;
return 0;
}
static int processField(Connection *conn) {
if (conn->currLineLen == 0) {
conn->progress = RECEIVE_BODY;
for (size_t i = 0; i < conn->fieldCount; i++) {
if (strcmp(conn->fields[i][0], "Content-Length") == 0)
conn->bodylen = atol(conn->fields[i][1]);
}
conn->body = malloc(conn->bodylen + 1);
if (conn->body == NULL)
return 1;
conn->receivedBody = 0;
return 0;
}
if (conn->fieldCount >= conn->allocatedFields) {
conn->allocatedFields *= 2;
char *(*newfields)[2] = realloc(conn->fields, conn->allocatedFields *
sizeof(char *[2]));
if (newfields == NULL)
return 1;
conn->fields = newfields;
}
char *line = conn->currLine;
char *split = strstr(line, ": ");
size_t linelen = conn->currLineLen;
if (split == NULL)
return 1;
char *header = malloc(split - line + 1);
memcpy(header, line, split - line);
header[split - line] = '\0';
linelen -= split - line + 2;
line += split - line + 2;
char *value = malloc(linelen + 1);
memcpy(value, line, linelen + 1);
conn->fields[conn->fieldCount][0] = header;
conn->fields[conn->fieldCount][1] = value;
conn->fieldCount++;
return 0;
}
static int processChar(Connection *conn, char c, Sitefile *site) {
if (conn->progress < RECEIVE_BODY) {
if (conn->currLineLen >= conn->currLineAlloc) {
conn->currLineAlloc *= 2;
char *newline = realloc(conn->currLine,
conn->currLineAlloc);
assert(newline != NULL);
conn->currLine = newline;
}
conn->currLine[conn->currLineLen++] = c;
if (c == '\n') {
if (--conn->currLineLen <= 0)
return 1;
if (conn->currLine[--conn->currLineLen] != '\r')
return 1;
conn->currLine[conn->currLineLen] = '\0';
if (conn->progress == RECEIVE_REQUEST) {
if (processRequest(conn))
return 1;
}
else if (conn->progress == RECEIVE_HEADER) {
if (processField(conn))
return 1;
}
conn->currLineLen = 0;
}
}
else if (conn->progress == RECEIVE_BODY) {
if (conn->receivedBody < conn->bodylen)
conn->body[conn->receivedBody++] = c;
}
if (conn->receivedBody >= conn->bodylen) {
sendResponse(conn, site);
}
return 0;
}
int updateConnection(Connection *conn, Sitefile *site) {
char buff[300];
for (;;) {
ssize_t received = read(conn->fd, buff, sizeof(buff));
if (received < 0)
return 1;
if (received == 0)
break;
for (unsigned long i = 0; i < received; i++) {
if (processChar(conn, buff[i], site))
return 1;
}
}
return 0;
}

78
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _HAVE_CONNECTIONS
#define _HAVE_CONNECTIONS
#include <runner.h>
#include <sitefile.h>
typedef enum {
RECEIVE_REQUEST,
RECEIVE_HEADER,
RECEIVE_BODY,
SEND_RESPONSE,
} ConnectionSteps;
typedef enum {
GET,
POST,
PUT,
HEAD,
DELETE,
PATCH,
OPTIONS,
} RequestTypes;
typedef struct Connection {
int fd;
ConnectionSteps progress;
RequestTypes type;
char *path;
//ephemeral
char *(*fields)[2];
//pointer to array of 2 pointers, persistent
size_t fieldCount;
size_t allocatedFields;
char *body;
//ephemeral
size_t bodylen;
size_t receivedBody;
struct Connection *next;
char *currLine;
//persistent
size_t currLineAlloc;
size_t currLineLen;
} Connection;
//The 2 types of fields:
//Persistent fields: Things which aren't freed after a reset, currLine, fields
//Ephemeral fields: Things which are freed and reallocated after each new
//request, path, body
int newConnection(Connection *ret, int fd);
//returns non-zero on error. creates a new connection bound to fd
void resetConnection(Connection *conn);
void freeConnection(Connection *conn);
int updateConnection(Connection *conn, Sitefile *site);
//returns non-zero on error.
//Generating a new connection and repeatedly calling updateConnection will
//handle everything.
#endif

26
src/include/responses.h Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _HAVE_RESPONSES
#define _HAVE_RESPONSES
#include <sitefile.h>
#include <connections.h>
int sendResponse(Connection *conn, Sitefile *site);
//This function assumes that every field in conn has been initialized, and
//resets conn for the next request
#endif

41
src/include/runner.h Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _HAVE_RUNNER
#define _HAVE_RUNNER
#include <sys/socket.h>
#include <sitefile.h>
#include <connections.h>
typedef struct {
Sitefile *site;
int *pending;
//pending[thread id] = the number of connections being handled by that
// thread
int *schedule;
/*
* schedule[0] = the thread that should take the next connection (-1 if
* there is no connection).
* schedule[1] = the fd of the connection to be accepted
*/
int id;
} RunnerArgs;
//my least favourite anti pattern
void *runServer(RunnerArgs *args);
#endif

32
src/include/sitefile.h Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef _HAVE_SITEFILE
#define _HAVE_SITEFILE
typedef struct {
int argc;
char **argv;
} SiteCommand;
typedef struct {
int size;
SiteCommand *content;
} Sitefile;
Sitefile *parseFile(char *path);
void freeSitefile(Sitefile *site);
#endif

141
src/main.c Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <pthread.h>
#include <netinet/in.h>
#include <runner.h>
#include <sitefile.h>
FILE *logs;
int main(int argc, char **argv) {
char *logout = "/var/log/swebs.log";
char *sitefile = NULL;
int processes = 8;
uint16_t port = htons(80);
int backlog = 100;
for (;;) {
int c = getopt(argc, argv, "o:j:s:c:p:b:h");
if (c == -1)
break;
switch (c) {
case 'o':
logout = optarg;
break;
case 'j':
processes = atoi(optarg);
break;
case 's':
sitefile = optarg;
break;
case 'p':
port = htons(atoi(optarg));
break;
case 'b':
backlog = atoi(optarg);
break;
case 'h':
printf(
"Usage: swebs [options]\n"
" -o [out] Set the log file (default: /var/log/swebs.log)\n"
" -j [cores] Use that many cores (default: 8)\n"
" -s [site file] Use that site file (required)\n"
" -p [port] Set the port (default: 443)\n"
" -b [backlog] Set the socket backlog (default: 100)\n"
);
exit(EXIT_SUCCESS);
case '?':
exit(EXIT_FAILURE);
}
}
int fd = socket(AF_INET, SOCK_STREAM, 0);
assert(fd >= 0);
int opt = 1;
assert(setsockopt(fd, SOL_SOCKET,
SO_KEEPALIVE | SO_REUSEPORT,
&opt, sizeof(opt)) >= 0);
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = port;
socklen_t addrlen = sizeof(addr);
assert(bind(fd, (struct sockaddr *) &addr, addrlen) >= 0);
assert(listen(fd, backlog) >= 0);
if (sitefile == NULL) {
fprintf(stderr, "No sitefile configured\n");
exit(EXIT_FAILURE);
}
logs = fopen(logout, "a");
if (logs == NULL) {
fprintf(stderr, "Couldn't open logs file %s\n", logout);
exit(EXIT_FAILURE);
}
Sitefile *site = parseFile(sitefile);
if (site == NULL) {
fprintf(stderr, "Invalid sitefile %s\n", sitefile);
exit(EXIT_FAILURE);
}
int *pending = calloc(processes - 1, sizeof(int));
int *schedule = malloc(2 * sizeof(int));
if (schedule == NULL)
exit(EXIT_FAILURE);
schedule[0] = -1;
pthread_t *threads = malloc(sizeof(pthread_t) * (processes - 1));
if (threads == NULL)
exit(EXIT_FAILURE);
for (int i = 0; i < processes - 1; i++) {
RunnerArgs *args = malloc(sizeof(RunnerArgs));
if (args == NULL)
exit(EXIT_FAILURE);
args->pending = pending;
args->schedule = schedule;
args->id = i;
pthread_create(threads + i, NULL,
(void*(*)(void*)) runServer, args);
}
for (;;) {
if (schedule[0] == -1) {
int newfd = accept(fd, (struct sockaddr *) &addr, &addrlen);
if (newfd < 0)
exit(EXIT_FAILURE);
int lowestThread = 0;
int lowestCount = schedule[0];
for (int i = 1; i < processes - 1; i++) {
if (schedule[i] < lowestCount) {
lowestThread = i;
lowestCount = schedule[i];
}
}
schedule[0] = lowestThread;
schedule[1] = newfd;
}
}
}

40
src/responses.c Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <responses.h>
static int sendConn(int fd, char *str) {
size_t len = strlen(str);
if (write(fd, str, len))
return 1;
return 0;
}
int sendResponse(Connection *conn, Sitefile *site) {
printf("test\n");
sendConn(conn->fd, "HTTP/1.1 200 OK\r\n");
sendConn(conn->fd, "Content-Type: text/html\r\n");
sendConn(conn->fd, "Content-Length: 16\r\n");
sendConn(conn->fd, "\r\n");
sendConn(conn->fd, "<p>Hi there!</p>");
resetConnection(conn);
return 0;
}

84
src/runner.c Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <runner.h>
#include <sitefile.h>
#include <connections.h>
void *runServer(RunnerArgs *args) {
Sitefile *site = args->site;
int *pending = args->pending;
int *schedule = args->schedule;
int id = args->id;
Connection *connections = NULL;
Connection *last = NULL;
//Connections are processed in a queue, which is really just a linked
//list where we add to the end and read from the beginning.
for (;;) {
if (schedule[0] == id) {
Connection *newconn = malloc(sizeof(Connection));
assert(newconn != NULL);
assert(newConnection(newconn, schedule[1]) == 0);
if (last == NULL)
connections = newconn;
else
last->next = newconn;
last = newconn;
pending[id]++;
schedule[0] = -1;
}
Connection *prev = NULL;
Connection *iter = connections;
//I know of the Linus Thorvalds good taste code thing, it just
//gets very confusing very fast to think about pointers to
//pointers which have pointers.
while (iter != NULL) {
if (updateConnection(iter, site)) {
if (iter->next == NULL)
last = prev;
if (prev == NULL)
connections = connections->next;
else
prev->next = iter->next;
Connection *newiter = iter->next;
freeConnection(iter);
iter = newiter;
pending[id]--;
//TODO: Clean this later
}
else {
prev = iter;
iter = iter->next;
}
}
}
return NULL;
}

198
src/sitefile.c Normal file
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/*
swebs - a simple web server
Copyright (C) 2022 Nate Choe
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <sitefile.h>
typedef enum {
SUCCESS,
LINE_END,
FILE_END,
ERROR,
} ReturnCode;
//this isn't ideal, but it's necessary to avoid namespace collisions.
static void freeTokens(int argc, char **argv) {
for (int i = 0; i < argc; i++)
free(argv[i]);
free(argv);
}
static ReturnCode getToken(FILE *file, char **ret) {
typedef enum {
QUOTED,
NONQUOTED,
} TokenType;
TokenType type;
for (;;) {
int c = fgetc(file);
if (c == '\n')
return LINE_END;
if (c == EOF)
return FILE_END;
if (c == '#') {
while (c != '\n')
c = fgetc(file);
return LINE_END;
}
if (!isspace(c)) {
if (c == '"')
type = QUOTED;
else {
type = NONQUOTED;
ungetc(c, file);
}
break;
}
}
long allocatedLen = 30;
long len;
*ret = malloc(allocatedLen);
for (len = 0;; len++) {
int c = fgetc(file);
switch (type) {
case QUOTED:
if (c == '"')
goto gotToken;
break;
case NONQUOTED:
if (isspace(c)) {
ungetc(c, file);
goto gotToken;
}
break;
}
switch (c) {
case '\\':
c = fgetc(file);
if (c == EOF)
goto error;
break;
case EOF:
if (type == NONQUOTED)
goto gotToken;
goto error;
}
(*ret)[len] = c;
}
gotToken:
(*ret)[len] = '\0';
return SUCCESS;
error:
free(*ret);
return ERROR;
}
static ReturnCode getCommand(FILE *file, int *argcret, char ***argvret) {
//THIS FUNCTION WILL NOT RETURN LINE_END
if (feof(file))
return FILE_END;
int argc = 0;
int allocatedTokens = 5;
char **argv = malloc(allocatedTokens * sizeof(char *));
for (;;) {
ReturnCode code = getToken(file, argv + argc);
switch (code) {
case ERROR:
goto error;
case LINE_END:
if (argc == 0)
continue;
//We allow empty lines
//fallthrough
case FILE_END:
if (argc == 0) {
free(argv);
return FILE_END;
}
*argcret = argc;
*argvret = argv;
return SUCCESS;
case SUCCESS:
argc++;
if (argc >= allocatedTokens) {
allocatedTokens *= 2;
char **newargv = realloc(*argv,
allocatedTokens * sizeof(char *));
if (newargv == NULL)
goto error;
argv = newargv;
}
break;
}
}
error:
freeTokens(argc, argv);
return ERROR;
}
Sitefile *parseFile(char *path) {
FILE *file = fopen(path, "r");
if (file == NULL)
return NULL;
Sitefile *ret = malloc(sizeof(Sitefile));
if (ret == NULL)
return NULL;
int allocatedLength = 50;
ret->size = 0;
ret->content = malloc(allocatedLength * sizeof(SiteCommand));
if (ret->content == NULL) {
free(ret);
return NULL;
}
for (;;) {
int argc;
char **argv;
ReturnCode status = getCommand(file, &argc, &argv);
switch (status) {
case FILE_END:
fclose(file);
return ret;
case ERROR: case LINE_END:
goto error;
case SUCCESS:
break;
}
if (ret->size >= allocatedLength) {
allocatedLength *= 2;
SiteCommand *newcontent = realloc(ret->content,
allocatedLength * sizeof(SiteCommand));
if (newcontent == NULL)
goto error;
ret->content = newcontent;
}
ret->content[ret->size].argc = argc;
ret->content[ret->size].argv = argv;
}
error:
freeSitefile(ret);
return NULL;
}
void freeSitefile(Sitefile *site) {
for (long i = 0; i < site->size; i++)
freeTokens(site->content[i].argc, site->content[i].argv);
free(site->content);
free(site);
}

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work/.gitkeep Normal file
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